JP2010217273A - Radiation image detecting cassette - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation image detecting cassette capable of preventing partial heat generation in an electric substrate and preventing an imaging element from causing failure due to heat generation to detect a radiation image accurately. <P>SOLUTION: A portable cassette type detector 1 has a housing 3 whose at least a part is constituted by a resin member and has a control substrate 23B in the direction reverse to the direction of installation of a detection unit 21 for a base 22. The heat generated in the control substrate 23B is discharged by a heat discharging part 27 through a second lid member 33. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a radiological image detection cassette.

  In a medical diagnosis field, a reading device that reads radiation image data by scanning a phosphor plate built in a CR (Computed Radiography) cassette with excitation light, and a control that acquires the radiation image data read by the reading device A CR system using a device (console) has been put into practical use.

  Furthermore, instead of the CR cassette, an image sensor that is two-dimensionally arranged on the substrate is built in, and an FPD (Flat Panel Detector) capable of outputting an electrical signal corresponding to the amount of radiation irradiated to the image sensor. Has been proposed. If this FPD is used, it is possible to ensure the immediacy of directly obtaining radiographic image data without requiring a reading device that irradiates excitation light and reads the radiographic image.

  The cassette type FPD has a size conforming to the JIS standard so that it can be used for an existing photographing apparatus in a CR system or the like, and ensures versatility. In addition, the cassette type FPD is transported to a radiographic image capturing location and set in an imaging apparatus, so that weight reduction is required in consideration of transportability. For example, in the technique described in Patent Document 1, the front member and the back member, which are the exteriors of the cassette type FPD, are not made of metal but formed of a resin member such as carbon resin, polycarbonate resin, or ABS resin, thereby reducing the weight of the entire cassette. I am trying.

  Moreover, the technique described in Patent Document 2 uses a carbon fiber reinforced plastic material as a lightweight and highly durable composite material that has a low X-ray attenuation characteristic for a protective housing that is an exterior.

JP 2008-129231 A JP 2008-90304 A

  By the way, in the cassette type FPD, there are many electric boards that drive and control the image sensor, and there are many integrated circuits (ICs) that generate heat on the electric board. Yes. In addition, since the cassette type FPD has a size conforming to the JIS standard, there is not much space in the FPD, and the electric substrates are often densely packed. As a result, local heat is generated by the integrated circuit in the cassette type FPD. Since the image sensor is installed on the back side of the electric board, the image sensor in the vicinity of the heat generating part may break down due to local heat generation, or it may cause errors and noise due to the position of the image sensor due to uneven temperature distribution. I will. As described above, the radiation image cannot be detected appropriately and accurately under the influence of different temperature distribution conditions depending on the position of the image sensor surface.

  Further, if the exterior of the cassette type FPD is formed by a resin member as in the technique described in Patent Document 1, the resin member has low thermal conductivity, so that heat generated in the integrated circuit is transferred to the outside of the cassette type FPD. Since it cannot escape and heat cannot be disperse | distributed within a cassette type FPD, local heat_generation | fever is not eliminated.

  Further, even if the exterior of the cassette-type FPD is formed of a carbon fiber reinforced plastic material as in the technique described in Patent Document 2, the heat generated in the integrated circuit is reduced because the carbon fiber reinforced plastic material has low thermal conductivity. Since it cannot escape to the outside of the mold type FPD and heat cannot be dispersed in the cassette type FPD, local heat generation is not eliminated.

  Accordingly, an object of the present invention is to provide a radiographic image detection cassette that appropriately detects a radiographic image by suppressing local heat generation in an electric substrate to prevent a failure of an image sensor and the like.

In order to achieve the above object, a radiological image detection cassette according to the present invention comprises:
A portable radiation image detection cassette that detects radiation irradiated toward a subject and obtains radiation image data,
A detector unit comprising: a scintillator that converts incident radiation into light; and a detector that receives the light converted by the scintillator and converts it into an electrical signal;
A base on which at least the detector unit is installed; and
An electrical board installed in a direction opposite to the installation direction of the detector unit with respect to the base, supplying power to the detector unit or controlling the detector unit;
A housing in which the detector unit, the base, and the electric substrate are built, and at least a part is formed of a resin member;
A heat dissipating part for releasing heat generated in the electric substrate;
It is characterized by having.

  The radiological image detection cassette according to the present invention can appropriately detect a radiographic image by suppressing local heat generation in the electric substrate and preventing a failure of the image sensor.

It is a perspective view which shows a cassette type | mold detector. It is a disassembled perspective view of a housing. It is sectional drawing of the predetermined location which looked at the cassette type detector shown in FIG. 1 from the a direction. It is an equivalent circuit block diagram for 1 pixel of the photoelectric conversion part which comprises a signal detection part. FIG. 5 is an equivalent circuit configuration diagram in which the photoelectric conversion units illustrated in FIG. 4 are two-dimensionally arranged. It is sectional drawing of the predetermined location which looked at the cassette type detector shown in FIG. 1 from b direction. It is sectional drawing of the predetermined location in the cassette type | mold detector which shows another embodiment. It is sectional drawing of the predetermined location in the cassette type | mold detector which shows another embodiment. It is a top view which shows the relationship with a 1st heat-transfer member, a 2nd heat-transfer member, and a heat radiating member. It is sectional drawing of the predetermined location in the cassette type | mold detector which shows another embodiment. It is sectional drawing of the cassette type detector 1 which installed the 1st cover member and 2nd cover member which are another form. It is explanatory drawing in which the inner cover and the outer cover were installed in the main-body part. It is explanatory drawing which expanded the X area | region and Y area | region in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Outline of cassette type detector]
FIG. 1 is a perspective view of a cassette type detector. A cassette type detector 1 which is a radiation image detection cassette is a cassette type flat panel detector. The cassette-type detector 1 includes a radiation detection unit 2 (see FIG. 3 and the like) that detects irradiated radiation and acquires it as digital image data, and a housing (housing) 3 that houses the radiation detection unit 2 therein. I have.

  In this embodiment, the housing 3 is formed so that the thickness in the radiation incident direction is 15 mm. The thickness of the housing 3 in the radiation incident direction is 16 mm or less, and is within the range of the size (15 mm + 1 mm and 15 mm-2 mm) according to the JIS standard (JIS Z 4905) in the conventional screen / film cassette. (The international standard corresponding to JIS Z 4905 is IEC 60406).

  FIG. 2 is an exploded perspective view of the housing 3. As shown in FIG. 2, the housing 3 includes a hollow main body 31 having openings 311 and 312 at both ends, and a first lid member (lid) 32 that closes the openings 311 and 312 of the main body 31. And a second lid member (lid portion) 33.

  The main body 31 is made of a carbon fiber body (for example, carbon fiber reinforced plastic: CFRP), and is lightweight and excellent in strength. Also, the X-ray transmittance is good. The thickness of the main body 31 is, for example, 1 mm to 2 mm, and is made cylindrical to maintain the strength of the cassette type detector 1.

  The first lid member 32 and the second lid member 33 include lid body portions 321 and 331 and insertion portions 322 and 332, and are formed of aluminum (made of metal).

  Engagement pieces 324 and 334 that engage the first lid member 32 and the second lid member 33 and the main body 31 are inserted into the openings 311 and 312 on the side surfaces of the insertion portions 322 and 332, respectively. Extends in the direction. Engagement projections 325 and 335 are provided on the outer surfaces of the engagement pieces 324 and 334, respectively. When the first lid member 32 and the second lid member 33 are inserted into the main body portion 31, the engagement convex portions 325 and 335 engage with the engagement concave portions 315 and 316 installed in the main body portion 31.

  An antenna device 9 for transmitting and receiving information wirelessly between the cassette type detector 1 and an external device is embedded in one side surface of the lid main body portion 321 of the first lid member 32. 9 includes a pair of flat radiation plates 91 and 92 made of metal, and a power feeding unit 93 that feeds power to the pair of radiation plates 91 and 92.

  In addition, when charging the rechargeable battery 24 (see FIG. 3 and the like) provided inside the housing 3 on one surface of the lid main body 321 on the same surface as the surface on which the antenna device 9 is formed. A charging terminal 45 connected to an external power source or the like and a power switch 46 for switching ON / OFF of the power source of the cassette type detector 1 are provided. Furthermore, the corner 47 formed by the surface on which the antenna device 9 is formed and the surface on the radiation incident side is composed of, for example, an LED or the like, and is an indicator 47 that displays the charging status of the rechargeable battery 24 and various operation statuses. Is provided.

[Internal structure of cassette type detector]
Next, the internal structure of the cassette type detector 1 will be described. FIG. 3 is a cross-sectional view of a predetermined portion of the cassette type detector 1 shown in FIG.

  As shown in FIG. 3, the radiation detection unit 2 includes a detector unit 21, a base 22, and electrical components (a relay board 23A, a control board (electric board) 23B, a rechargeable battery 24, etc.). In this embodiment, the detector unit 21 is attached to the upper surface of the base 22 via the shielding member 25, and a plurality of control boards 23B, rechargeable batteries 24, and the like are provided on the lower surface of the base 22. Electrical parts are installed. That is, the control board 23B and the like are installed in the direction opposite to the installation direction of the detector unit 21 with respect to the base 22.

  The base 22 is flexible and is made of a thin resin. The thickness is about 1 mm, and the material is, for example, a resin in which polycarbonate and ABS are mixed. In this way, the base 22 is formed of a flexible resin. By reducing the weight, it is possible to improve the ability to set the affected area at the time of photographing and the portability when the cassette type detector 1 is moved.

  The detector unit 21 includes a scintillator layer 211, a signal detection unit (not shown) as a detection unit, a counter glass plate 212, a glass substrate 213, a reinforcing member 214, and the like. The basic structure of the detector unit 21 will be described. A signal detection unit is supported on a glass substrate 213, and a scintillator layer 211 is disposed above the signal detection unit. A counter glass plate 212 is disposed above the scintillator layer 211, and the scintillator layer 211 is sandwiched between the counter glass plate 212 and the glass substrate 213.

  The scintillator layer 211 has a function of converting incident radiation into light. The scintillator layer 211 has, for example, a phosphor as a main component, and outputs an electromagnetic wave having a wavelength of 300 nm to 800 nm, that is, an electromagnetic wave (light) ranging from ultraviolet light to infrared light centering on visible light, based on incident radiation. It is like that.

  A signal detection unit (indicated by 151 in FIG. 5) is formed below the scintillator layer 211. The signal detection unit converts electromagnetic waves (light) output from the scintillator layer 211 into electric energy and accumulates and accumulates them. The image signal is output based on the electrical energy.

  Both the opposing glass plate 212 and the glass substrate 213 have a thickness of about 0.6 mm, and by cutting the end surface with a laser, an end surface, that is, a ridge line portion between the cut surface and the upper surface of the glass substrate. And the smoothing process which smoothes the ridgeline part of a cut surface and the lower surface of a glass base material is given.

  A reinforcing member 214 is installed below the glass substrate 213, and the protruding portion of the glass substrate 213 with respect to the counter glass plate 212 is reinforced. A protective member 215 that protects the counter glass plate 212 is provided above the counter glass plate 212.

  At the end of the glass substrate 213, an electrical signal extraction unit 216 for extracting an electrical signal generated by the signal detection unit is provided. The electrical signal extraction unit 216 and the first relay substrate 23A are connected by a flexible harness 26. Has been.

  In the present embodiment, an electric double layer capacitor is used as the rechargeable battery 24 attached to the lower surface of the base 22. However, in addition to the electric double layer capacitor, a rechargeable battery such as a lithium ion capacitor, a nickel cadmium battery, a nickel metal hydride battery, a lithium ion battery, a small sealed lead battery, or a lead storage battery can be applied.

  The rechargeable battery 24 is installed at a predetermined position on the base 22 so as to be electrically connected to the charging terminal 45 described above. For example, the cassette type detector 1 is connected to an external power source. By attaching to a charging device such as a cradle (not shown), the terminal on the charging device side and the charging terminal 45 on the housing 3 side are connected to charge the rechargeable battery 24. .

[Circuit configuration of detector unit]
Next, the circuit configuration of the detector unit 21 will be described. FIG. 4 is an equivalent circuit diagram of a photoelectric conversion unit for one pixel constituting the signal detection unit 151.

  As shown in FIG. 4, the configuration of the photoelectric conversion unit for one pixel is a photodiode 152 and a thin film transistor (hereinafter referred to as “TFT”) 153 that extracts electric energy accumulated in the photodiode 152 as an electric signal by switching. It consists of and. The photodiode 152 is an image sensor that generates and accumulates charges. The electrical signal taken out from the photodiode 152 is amplified by an amplifier 154 to a level that can be detected by the signal readout circuit 17.

  Specifically, when light is irradiated, a charge is generated in the photodiode 152, and when a signal reading voltage is applied to the gate G of the TFT 153, the charge is transferred from the photodiode 152 connected to the source S of the TFT 153. It flows to the drain D side of the TFT 153 and is stored in a capacitor 154 a connected in parallel to the amplifier 154. The amplifier 154 outputs an electric signal amplified in proportion to the electric charge accumulated in the capacitor 154a.

  When the amplified electrical signal is output from the amplifier 154 and the electrical signal is extracted, the switch 154b connected in parallel to the amplifier 154 and the capacitor 154a is turned on, and the charge accumulated in the capacitor 154a is released. The amplifier 154 is reset.

  FIG. 5 is an equivalent circuit diagram in which such photoelectric conversion units are two-dimensionally arranged. Between the pixels, the scanning lines Ll and the signal lines Lr are arranged so as to be orthogonal to each other. One end side of the photodiode 152 is connected to the source S of the TFT 153, and the drain D of the TFT 153 is connected to the signal line Lr. On the other hand, the other end side of the photodiode 152 is connected to the other end side of the adjacent photodiode 152 arranged in each row, and is connected to the rechargeable battery 24 through a common bias line Lb.

  The rechargeable battery 24 is connected to the control board 23B, and a voltage is applied to the photodiode 152 through the bias line Lb according to an instruction from the control board 23B (that is, power supply to the detector unit 21 is controlled by the control board 23B. Note that the control board 23B may control the detector unit 21). The gates G of the TFTs 153 arranged in each row are connected to a common scanning line Ll, and the scanning line Ll is connected to the control substrate 23B via the scanning drive circuit 16. Similarly, the drains D of the TFTs 153 arranged in each column are connected to a signal readout circuit 17 that is connected to a common signal line Lr and controlled by the control substrate 23B.

  The signal readout circuit 17 is provided with the amplifier 154 for each signal line Lr described above. At the time of signal reading, a signal reading voltage is applied to the selected scanning line Ll, whereby a voltage is applied to the gate G of each TFT 153 connected to the scanning line Ll, and each photodiode is connected via each TFT 153. The charge generated in the photodiode 152 flows from the signal line 152 to each signal line Lr. Then, each amplifier 154 amplifies the charge for each photodiode 152, and information of the photodiode 152 for one row is extracted. This operation is performed for all the scanning lines Ll by switching the scanning lines Ll, whereby information is extracted from all the photodiodes 152.

  A sample hold circuit 155 is connected to each amplifier 154. Each sample and hold circuit 155 is connected to an analog multiplexer 156 provided in the signal readout circuit 17, and the signal read out by the signal readout circuit 17 is described above from the analog multiplexer 156 via the A / D converter 157. It is output to the control board 23B.

  As described above, the X-ray image of the subject can be detected by using the cassette type detector 1 as shown in FIGS.

[Dissipation of heat generated by electrical boards]
Next, heat release generated in the control board 23B will be described in detail. FIG. 6 is a cross-sectional view of a predetermined portion of the cassette type detector 1 shown in FIG.

  As shown in FIG. 6, there is a control board 23B on the lower surface of the base 22, and an integrated circuit 231B is installed on the control board 23B. Although not shown in FIG. 6, a plurality of control boards 23 </ b> B are installed on the base 22, and the cassette type detector 1 is compliant with the JIS standard, so there is not much space in the cassette type detector 1. The control boards 23B are densely packed. When the cassette type detector 1 is turned on, local heat is generated by the integrated circuit 231B. If no measures against heat generation are taken, the local heat generation causes the photodiode 152 (see FIG. 5) in the vicinity of the heat generating portion in the detector unit 21 to fail, or the error due to the position of the photodiode 152 due to temperature distribution unevenness, It may cause noise. In this way, the temperature distribution condition depending on the position of the photodiode 152 is affected differently, and the radiographic image cannot be detected appropriately and accurately.

  For example, temperature distribution unevenness due to each position of the photodiode 152 when acquiring dark image data when there is no subject and no X-ray irradiation and when acquiring main image data (image data obtained by irradiating the subject with X-rays). If they are different from each other, the offset correction for subtracting the dark image data from the main image data cannot be performed correctly, an abnormality occurs in the image data to be handled, and the radiation image cannot be detected appropriately with high accuracy. The offset correction is correction that acquires image data twice and obtains a difference between the acquired image data. Therefore, if there is a local temperature rise in a specific photodiode 152 of the detection panel, the temperature distribution The degree of unevenness is different, and correct offset correction cannot be performed, so that an abnormality occurs in the image data to be handled, and the radiographic image cannot be detected appropriately and accurately.

  In addition, even if the photodiode 152 is irradiated with the same amount of X-rays, the output of the same charge may not be obtained if the ambient temperature of the photodiode 152 differs greatly.

  When the ambient temperature of each photodiode 152 in the detection panel rises uniformly over the entire detection panel, the temperature compensation of each photodiode 152 can be controlled with a single temperature compensation coefficient relatively easily. However, if there is a local temperature rise at a specific position of the photodiode 152 of the detection panel, a means for specifying which part is the local temperature rise position is required, which increases the cost. It becomes difficult to deal with realistic temperature compensation. Thus, if there is a local temperature rise at a specific position of the detection panel, accurate temperature compensation becomes difficult, and a radiographic image cannot be detected appropriately and accurately.

  In the present invention, even if local heat is generated from the integrated circuit 231B built in the cylindrical housing having a size conforming to the JIS standard, a part of the local heat generation is removed from the side surface portion of the cylindrical housing. (Surface perpendicular to the direction in which the X-rays are incident on the surface of the photodiode 152 of the detection panel) to suppress a local temperature rise in the heat generating portion, and uneven temperature distribution on each surface of the photodiode 152 of the detection panel. By controlling within the predetermined range, the cause of error and noise due to the position of the photodiode 152 is eliminated.

  Therefore, in order to suppress local heat generation in the control board 23B, the heat radiating portion 27 is installed. One end of the heat radiating part 27 is connected to the integrated circuit 231B, and the other end of the heat radiating part 27 is connected to a second lid member 33 made of metal. As a result, the heat generated in the integrated circuit 231B is transmitted from the heat radiating portion 27 to the second lid member 33, and a part of the generated heat is distributed to the side surface portion (in this case, the second lid member 33) of the cylindrical housing. Heat is released through the second lid member 33.

  In this way, by installing the heat dissipating part 27 for releasing the heat generated in the control board 23B in the cassette type detector 1 which is suppressed to a certain size, the local heat generation generated in the cassette type detector 1 is reduced. 2 is dispersed in the lid member 33, and local heat generation is suppressed to prevent a failure of the photodiode 152 and the like, and a radiographic image is detected appropriately and accurately. Further, even when a part of the housing 3 (main body portion 31 in this embodiment) is formed of a resin member having low thermal conductivity for weight reduction, the heat is distributed to the second lid member 33 portion and locally. Heat generation can be suppressed.

  The internal temperature of the housing 3 of the cassette type detector 1 is around 40 ° C. (when the room temperature is 25 ° C.) when the power supply is ON and the integrated circuit 231B is in an operating state. By disposing the heat dissipating part 27, local heat generation is dispersed in the second lid member 33 part, and local heat generation is suppressed, so that the temperature distribution unevenness of each photodiode 152 surface of the detection panel can be reduced. By keeping the temperature within the range of 5 ° C., the cause of error and noise due to the position of the photodiode 152 is eliminated, the failure of the photodiode 152 and the like are prevented, and the radiation image is detected appropriately and accurately.

  In the cassette type detector 1 shown in FIG. 6, the heat radiating portion 27 is connected to the second lid member 33 and heat is released through the second lid member 33. However, as shown in FIG. The heat dissipating part 27 may be additionally provided, and the heat dissipating part 27 may be connected also to the first lid member 32. In this way, by connecting the heat dissipating portion 27 to the plurality of lid members and dispersing the heat generated in the control board 23B by the plurality of lid members, a part of the heat is generated on both the side surfaces of the cylindrical housing (this In the case, it can be efficiently distributed to the second lid member 33 and the first lid member 32), local heat generation can also be efficiently suppressed, and the heat radiation efficiency can be further improved than before the heat radiation portion 27 is added, It is effective. In this way, the temperature distribution unevenness on the surface of each photodiode 152 of the detection panel is kept within a range of 5 ° C., thereby eliminating errors and noise factors due to the position of the photodiode 152, and the photodiode 152. To prevent radiation failure and detect radiation images appropriately and accurately.

  Furthermore, another embodiment of the cassette type detector 1 is shown in FIGS. In order to reduce the weight of the cassette-type detector 1, when the first lid member 32 and the second lid member 33 are formed of a carbon fiber body like the main body 31 and the entire housing 3 is formed of a resin member, Heat is less likely to be released from the first lid member 32 and the second lid member 33 as compared to the case of manufacturing. Thus, as in the embodiment of FIGS. 8 to 10, a configuration in which a heat dissipation member is installed on the inner surface of the first lid member 32 or the second lid member 33 is conceivable.

  First, the embodiment of FIG. 8 will be described in detail. A first heat transfer member 28 is connected to the integrated circuit 231B, and a second heat transfer member (for example, made of copper) that transfers heat toward the second lid member 33 is connected to the first heat transfer member 28. (In this embodiment, the 1st heat transfer member 28 and the 2nd heat transfer member 29 function as a heat transfer member). A heat radiating member (such as copper foil) 336 is installed on the inner surface of the second lid member 33, and the heat radiating member 336 and the second heat transfer member 29 are connected to each other.

  FIG. 9 is a plan view showing the relationship between the first heat transfer member 28, the second heat transfer member 29, and the heat dissipation member 336 shown in FIG. The control board 23B is provided with a plurality of integrated circuits 231B, and the first heat transfer member 28 is connected to all the integrated circuits 231B. The heat transmitted from the integrated circuit 231 </ b> B to the first heat transfer member 28 is transmitted to the second heat transfer member 29 and the heat dissipation member 336.

  Even if the second lid member 33 is formed of a carbon fiber body, the heat generated in the control board 23B by the first heat transfer member 28, the second heat transfer member 29, and the heat dissipation member 336 is generated by the second lid member 33. By transmitting and dispersing in the direction, the local temperature rise due to heat accumulation in the heat generation portion of the control board 23B is suppressed. Further, by receiving and accumulating the heat transmitted and dispersed in the heat radiating member 336, the temperature distribution unevenness of the entire detection panel can be kept within a predetermined range. In this way, the temperature distribution unevenness on the surface of each photodiode 152 of the detection panel is kept within a range of 5 ° C., thereby eliminating errors and noise factors due to the position of the photodiode 152, and the photodiode 152. To prevent radiation failure and detect radiation images appropriately and accurately.

  In the cassette type detector 1 shown in FIG. 8, heat is released in the direction of the second lid member 33 by the first heat transfer member 28 and the second heat transfer member 29. However, as shown in FIG. A first heat transfer member 28 and a second heat transfer member 29 are added around 231B, a heat radiating member 326 is installed on the inner surface of the first lid member 32, and heat is also applied in the direction of the first lid member 32. May be transmitted.

  In this way, the heat generated in the control board 23B is transmitted and dispersed in the direction of the plurality of lid members, thereby effectively suppressing local temperature rise due to heat accumulation in the heat generation part of the control board 23B. To do. Furthermore, by receiving and accumulating the heat transmitted and dispersed in both the heat radiating member 336 and the heat radiating member 326, the temperature distribution unevenness of the entire detection panel can be efficiently kept within a predetermined range. In this way, the temperature distribution unevenness on the surface of each photodiode 152 of the detection panel is kept within a range of 5 ° C., thereby eliminating errors and noise factors due to the position of the photodiode 152, and the photodiode 152. To prevent radiation failure and detect radiation images appropriately and accurately.

  As described above, the heat release generated in the control board 23B has been described with reference to FIGS. 6 to 10. However, the present invention is not limited to the embodiment shown in FIGS. Other forms may be used as long as the structure disperses the local heat generated in 23B.

[Another embodiment of the first lid member and the second lid member]
Next, another embodiment of the first lid member 32 and the second lid member 33 in the cassette type detector 1 will be described with reference to FIGS. FIG. 11 is a cross-sectional view of a cassette type detector 1 provided with a first lid member and a second lid member according to another embodiment.

  Since the first lid member 32 and the second lid member 33 shown in FIG. 11 have the same structure, the second lid member 33 will be described in detail here. The second lid member 33 is mainly composed of an inner lid 33A inserted inside the main body 31 and an outer lid 33B installed so as to cover the inner lid 33A. The process of installing the inner lid 33A and the outer lid 33B on the main body 31 will be described in detail with reference to FIGS.

  12A is an explanatory diagram in which an inner lid 33A is installed in the main body 31, and FIG. 12B is an explanatory diagram in which an outer lid 33B is installed outside the inner lid 33A. As shown in FIG. 12A, the inner lid 33A is inserted in the direction c toward the main body 31, and is screwed with fixing screws 331A and 332A from the vertical direction of the inner lid 33A after insertion. As shown in FIG. 12A, the inner lid 33 </ b> A enters the inside of the main body 31, so that the rigidity of the end of the main body 31 can be ensured. The inner lid 33A is provided with a fixing hole 333A for fixing the outer lid 33B.

  After the inner lid 33A is inserted into the main body 31 and screwed, the outer lid 33B is installed so as to cover the inner lid 33A and the fixing screws 331A and 332A as shown in FIG. The recess d is screwed to the inner lid 33A by a fixing screw 331B. The outer lid 33B is formed of an elastic member, and even if the user accidentally drops the cassette-type detector 1 while carrying it, the outer lid 33B absorbs the impact of the drop, and the cassette-type detector 1 damage can be suppressed.

  An enlarged view of the X region in FIG. 12B is shown in FIG. There is a gap between the main body 31 and the outer lid 33B. For example, when the cassette-type detector 1 is being cleaned by the alcohol-impregnated cleaning member, alcohol penetrates into the cassette-type detector 1. There is a possibility that foreign matter enters the mold detector 1. However, as shown in FIG. 13A, a waterproof adhesive body α is installed between the main body 31 and the outer lid 33B, and a liquid such as alcohol and other foreign matters are detected in the cassette type detector 1. Preventing entry into. The outer lid 33B can be replaced by removing the adhesive body α and the fixing screw 331B.

  An enlarged view of the Y region in FIG. 12B is shown in FIG. The outer lid 33B is provided with a protrusion β around the hole through which the fixing screw 331B passes. When the outer cover 33B is screwed with the fixing screw 331B, the seating surface of the fixing screw 331B comes into contact with the protrusion β. As a result, the protrusion β becomes a barrier, and liquid such as alcohol and other foreign matters do not enter from the outside.

  By employing the lid member structure described above with reference to FIGS. 11 to 13, waterproofness and impact resistance can be ensured.

DESCRIPTION OF SYMBOLS 1 Cassette type detector 2 Radiation detection part 3 Housing 21 Detector unit 22 Base 23A Relay board 23B Control board 24 Rechargeable battery 27 Heat radiation part 28 1st heat-transfer member 29 2nd heat-transfer member 31 Main-body part 32 1st Lid member 33 second lid member 33A inner lid 33B outer lid 151 signal detector 211 scintillator layer 326, 336 heat dissipation member

Claims (5)

A portable radiation image detection cassette that detects radiation irradiated toward a subject and obtains radiation image data,
A detector unit comprising: a scintillator that converts incident radiation into light; and a detector that receives the light converted by the scintillator and converts it into an electrical signal;
A base on which at least the detector unit is installed; and
An electrical board installed in a direction opposite to the installation direction of the detector unit with respect to the base, supplying power to the detector unit or controlling the detector unit;
A housing in which the detector unit, the base, and the electric substrate are built, and at least a part is formed of a resin member;
A heat dissipating part for releasing heat generated in the electric substrate;
A radiation image detection cassette characterized by comprising: The housing is composed of at least a main body portion having an opening and formed of a resin member, and a metal lid that closes the opening.
The radiation image detection cassette according to claim 1, wherein the heat dissipating part and the lid part are connected. The housing is composed of at least the main body portion and the plurality of lid portions,
The radiation image detection cassette according to claim 2, wherein the heat radiating portion and the plurality of lid portions are connected. The housing includes at least a main body portion having an opening and formed of a resin member, and a lid portion that closes the opening.
The radiographic image according to claim 1, wherein the heat radiating portion includes at least a heat radiating member installed on a lid portion, and a heat transfer member that transfers heat between the electric substrate and the heat radiating member. Detection cassette. The housing is composed of at least the main body portion and the plurality of lid portions,
The heat dissipating part is configured by at least a plurality of heat dissipating members installed on each of the lid parts, and a plurality of heat transfer members that transmit heat between the electric substrate and the plurality of heat dissipating members. The radiographic image detection cassette according to claim 4.

Images