WO2003041585A1

WO2003041585A1 - Medical method and apparatus for obtaining infrared image

Info

Publication number: WO2003041585A1
Application number: PCT/CN2002/000771
Authority: WO
Inventors: Caijie Yan; Xinhua Wang
Original assignee: Caijie Yan; Xinhua Wang
Priority date: 2001-11-16
Filing date: 2002-10-31
Publication date: 2003-05-22

Abstract

A method for displaying a real image of the image of the deep structure of a human body by detecting the infrared radiation emitted by the human body. An infrared optical system and an infrared detector are used to select the infrared lights having a wavelength in a range of between 9.2 and 10.4 microns. The selected infrared lights are converted to the digital electronic singles. The singles then are transmitted to a computer and are processed to show the depth structure of a human body. The present invention also provides an apparatus for implementing said method.

Description

Medical infrared fluoroscopy method and infrared fluorometer

The invention relates to a medical infrared radiation thermal imaging technology, in particular to a medical infrared fluoroscopy method capable of seeing through the deep structure of a human body, and an infrared fluoroscopy device made according to the method. technical background

The existing traditional infrared thermal imaging technology at home and abroad is generally that the infrared light radiated from the human body's hot place is scanned by the optical machine, infrared optical system, and frequency-divided and filtered into the infrared detector to form an analog electrical signal, which is then amplified and processed. The analog-to-digital converter becomes a digital electric signal, and the digital electric signal is transmitted to a computer and an image is output from a display. Among them: 1. The line scan in the optomechanical scan is a plane mirror driven by a motor and constantly swinging back and forth. Its main disadvantage is that the scanning and imaging speed is very slow, and the structure of the human body cannot be displayed dynamically. 2. The overall focal length of the infrared optical system is too long, and the depth of field and temperature depth are not enough in close-up situations, and it is not possible to take a complete or sufficient amount of human heat. Field infrared radiation comprehensive wave information. At the same time, because the thickness of the fault is not enough, the image lacks texture and three-dimensionality. Therefore, it can only show the temperature distribution on the surface of the human body. Although it has diagnostic value for breast diseases, skin diseases, certain neurological diseases and diseases related to neurovascular functions, it can only be based on the temperature of the corresponding part for the deep structure. Change indirectly infers possible disease or dysfunction. Because the morphology of the deep structure of the human body (such as internal organs such as the heart and lungs) cannot be displayed, there is no accurate anatomical and morphological basis for the disease or abnormal function. Therefore, the traditional infrared thermal imaging technology has not become the main diagnostic method recognized by the medical community, and cannot be promoted and applied. Summary of the Invention

The object of the present invention is to provide a medical infrared fluoroscopy method that changes the traditional medical diagnostic mode, benefits humans, and can display the deep structure of the human body.

Another object of the present invention is to use the infrared fluorometer made by the above method, which can realize continuous dynamic camera and display functions without any damage to the human body, increase the number of heat map pixels per unit area of the human body structure, and improve髙 Effective spatial resolution and temperature resolution effect.

The medical infrared fluoroscopy method of the present invention is implemented by such a technical solution, which includes the following steps:

ω is controlled by a computer. It intercepts the thermal energy information of a certain fault in the human thermal field and radiates it through the surface thermal energy level. The infrared light passes through the frame scanning, line scanning, and infrared optical system in order to perform frequency division filtering to select infrared light with a wavelength of 9.2 micrometers to 10.4 micrometers, so that the infrared light that can reflect the deep structure of the human body is clearly Focus imaging in the infrared detector;

(2) the infrared detector converts the infrared light into an analog electrical signal, and the analog electrical signal is converted into a digital electrical signal after being amplified and converted by an analog-to-digital converter;

(3) The converted digital electrical signal is transmitted to a computer, and the computer uses special infrared fluoroscopy software to display the signal in a pseudo-color manner based on the principle of changing color without changing temperature. The temperature window is selected and adjusted. Ribbon editing and color editing are processed. Later, a clear image of the deep structure of the human body reflecting the fault is displayed in real time from the display.

The infrared fluorometer manufactured according to the above method is realized through such a technical solution, which includes a camera three-dimensional control base, an infrared fluoroscopy camera, a human thermal field control base, and a camera three-dimensional control base all connected to a console computer, respectively. A human body thermal field control base is provided at a position corresponding to the infrared perspective camera on the control base.

Since the above technical solution is adopted, the present invention has the following advantages:

1. According to the principle of "attenuated temperature-order perspective shadowing", the software can be used to achieve normalized and programmatic operations through software programming to meet clinical, scientific research, and network query needs. Especially the real-time image display control program is the first at home and abroad.

2. The method and the fluoroscope have the perspective effect of the deep structure of the human body.

3. Able to perform deep positioning perspective as required.

4. Pseudo-color display effect is clearer, more coordinated and better visual effect than traditional infrared thermal image.

5. Design a new type of infrared scanning device to increase the imaging speed of existing equipment by more than 10 ~ 15 times.

6. Improve the structure and performance of the infrared camera optical system, widen the temperature and depth, and improve the positioning of infrared perspective. The controllable range of the selective fault thickness is more than 1 times.

7. Designed the "quasi-sinusoidal scanning system" to further significantly increase the scanning imaging speed.

8. Realize continuous dynamic camera and display function, the imaging speed reaches the effect of 30 frames per second.

9. Increase the thermal pixels by more than 4 times (512 X 512) to achieve the effect of improving effective spatial resolution and temperature resolution. BRIEF DESCRIPTION OF THE DRAWINGS

The drawings of the present invention are explained as follows:

Figure 1 is a flowchart of the principle of infrared perspective imaging; FIG. 2 is a schematic diagram of the overall structure of the infrared fluorometer of the present invention; FIG.

3 is a schematic structural diagram of a three-dimensional control base of a camera of an infrared fluoroscopy device of the present invention;

FIG. 4 is a schematic diagram of an optical path of an infrared camera of an infrared perspective meter of the present invention; FIG.

5 is a schematic diagram of a quasi-sinusoidal bidirectional scanning cylinder structure in FIG. 4;

Figure 6 is an infrared perspective view of a normal person's abdomen;

Figure 7 is an infrared perspective view of a normal person's chest.

In the picture: 1. Infrared perspective camera; 2. Camera three-dimensional control base; 3. Console; 4. Line scan mirror; 5. Single crystal germanium lens; 6. Frame scan concave mirror; 7. Single crystal germanium lens; 8 .Infrared detector; 9.Base; 10.Advance and retreat track; 11. · Advance and retreat screw rod; 12.Positioning and adjusting chassis; I ³ .Horizontal adjusting screw; M.Horizontal adjusting chassis; 15.Lifting track; 16.Lift adjusting screw 17. Fixed plate; 18. Platform connected to infrared camera; 19. Temperature control room; 20. Human body thermal field control base; 21. Data transmission line; 22. Display; 23. Bidirectional scanning cylinder with sine curved surface. detailed description

The invention is further described below with reference to the drawings and embodiments-the invention includes the following steps:

(1) Controlled by a computer, the thermal energy information of a fault in the human thermal field is intercepted by the infrared light radiated by the thermal level of the body surface, and then sequentially scanned through the frame. The line scan and the infrared optical system are frequency-divided and filtered to select a wavelength of 9 . 2 micrometers to 10.4 micrometers of infrared light, so that the infrared light that can reflect the deep structure of the human body is clearly focused and imaged in the infrared detector;

(3) The converted digital electrical signal is transmitted to a computer, and the computer uses special infrared fluoroscopy software to display the signal in a pseudo-color manner based on the principle of changing color without changing temperature. Temperature window selection and adjustment. Ribbon editing and color editing Later, a clear image of the deep structure of the human body reflecting the fault is displayed in real time from the display.

Referring to FIG. 1, 40% to 60% of the heat generated by each part of the human body forms a human thermal field composed of a blood flow system, an air flow system, a non-bloody liquid, a parenchymal tissue, and the skin. The end surface layer of the body attenuates sequentially, and attenuating temperature-order perspective superimposed infrared radiation that reflects the morphology and function of the deep structure. The attenuated temperature-order perspective superimposed infrared radiation may obtain an infrared perspective view reflecting the deep structure of the human body through the above method .

In the above steps, the computer-controlled interception of a certain section of the human thermal field is performed in the following three ways: Line controlled-

(1) The position and position of the human body are automatically controlled by the computer and its corresponding software through the human thermal field control base, which includes:

① Sitting position. Standing position. Control of lying position;

② The orientation of the above postures is precisely controlled;

③ control of limb position;

(2) The automatic control of the overall position of the infrared optical system by the computer and its corresponding software through the camera three-dimensional control base, which includes: (adjusting the lens extension parameters to optimize the display level)

① Linkage: Linkage steps according to the set default object / image distance function relationship;

② Manual: Adjust the steps at any time according to actual needs;

③ Automatic: According to the set default parameters, automatically locate and focus to a predetermined position, and scan and image;

(3) The automatic control of the position of each component in the infrared optical system by a computer and its corresponding software through a dedicated servo motor system, which includes:

② Manual: Adjust the steps at any time according to actual needs;

③ Automatic: According to the set default parameters, it automatically locates and focuses to a predetermined position and scans for imaging; the corresponding computer software adopts parameter control to complete the control function of the camera system. The external appearance of the best parameters is imaging at the required site level, and the imaging levels and contours are clearer.

In the above steps, the processes of pseudo-color display, temperature window selection adjustment, color band editing, and color editing include:

(1) Ribbon adjustment steps for pseudo-color display

Pseudo-color display refers to the "color-in-place-temperature" display method that expresses color-sensitive temperature-sensitive effects by expressing changes in temperature in color. The color band refers to the color range in one-to-one correspondence with the temperature value. It is expressed as a strip-shaped rectangular frame, and the number of pixels between the upper and lower limits of the color is not less than 2048. Functions such as hue adjustment). The adjusted ribbon can be saved to disk.

① Ribbon length adjustment steps: Dynamically adjust the length of the rectangular frame of the ribbon so that the range of colors that can be expressed changes dynamically, the temperature window scale does not change, and the temperature represented by the color changes. Affects the imaging process.

② Ribbon color ratio adjustment steps: Dynamically adjust the proportion of the color range of a part of the ribbon. The temperature scale of the temperature window does not change, and the temperature range represented by the color is different, which will affect the imaging.

(2) Steps for adjusting the upper and lower limits of the temperature window and the absolute value of the distance: The temperature window refers to a temperature scale that corresponds to the color values in the color band on a one-to-one basis. When adjusting the upper and lower limits and spacing of the temperature window, the colors corresponding to the temperature window range are also different, affecting the Imaging.

(3) Ribbon editing: the adjustment step of replacing the colors in the ribbon;

(4) Color editing: ■

① Tone adjustment steps for full color and color separation,

② Full color and color separation brightness adjustment steps,

③ Full color and color separation contrast adjustment steps,

④ Full color and color separation blackness adjustment steps;

(5) Real-time image processing:

① Steps of field-of-view locking, zooming, and proportion control: Locking means keeping the field of view in the image frame unchanged and the number of pixels unchanged, and it is not affected by changes in distance and distance adjustment. The rest of the functions are relatively clear.

② Smoothness adjustment steps: The smoothness adjustment function mainly solves the problem of rough and uneven images through vertical and horizontal motion blur and Gaussian blur methods.

③ Multi-layer image overlay step;

(6) Display steps:

Scan the imaging frame observed during the imaging process,

The image display box that has completed the scanning and imaging process,

Set the icon edit box to store the drawings that have been exited from the display box and displayed in the form of icons. These icons can be called into the box at any time to enlarge the display. The icons can be edited, such as copy, paste, delete, etc .; (7) Heat map saving steps :

① After passing the review and removing the dissatisfied, the images are saved in batches;

② Automatically form the examinee's folder and serialized various file names;

③ The save file includes: pseudo-color image, temperature information, the ribbon name adjusted or not adjusted in use, the macro record of the operation process,

④ Automatically enter the database storage for easy network use.

In the above steps, the line scan uses a unidirectional rotating cylinder, and its reflection surface is a quasi-sinusoidal surface, so as to achieve fast linear and progressive two-way scanning.

As shown in FIG. 2, the infrared fluorometer manufactured according to the above method is characterized in that it includes a camera three-dimensional control base 2, an infrared fluoroscopy camera 1, and a human thermal field control base 20, which are respectively connected to a computer of the console 3. A human body thermal field control base 20 is provided at a position corresponding to the infrared perspective camera 1 provided on the camera three-dimensional control base 2. As shown in FIG. 4, the infrared perspective camera 1 mainly includes a frame-scanning concave mirror 6, a line-scanning mirror 21, a single crystal germanium lens 5, a single crystal germanium lens 7, and an infrared detector. The incident light path of the frame-scanning concave mirror 6 driven by the motor and constantly swinging corresponds to the thermal field of the human body. The line-scanning mirror 21 driven by the motor is set at the focal point of the frame-scanning concave mirror 6. The reflected light path of the line-scanning mirror 21 and The single crystal germanium lens 7 located before the infrared detector 8 corresponds.

As shown in FIG. 5, the scanning mirror 21 may be a bidirectional scanning cylinder 23 with a quasi-sinusoidal surface driven by a motor and rotating in one direction, and its quasi-sine wave number 4 ω 20 on the circumference. The quasi-sinusoidal bidirectional scanning cylinder 23 is designed based on the principle that the phase of the sine wave curve changes at each inflection point. It features unidirectional high-speed rotation, which can greatly improve the scanning speed of nearly 100 times. The positive and negative phase arc characteristics of the quasi-sinusoidal surface simultaneously meet the needs of linear scanning.

As shown in FIG. 3, the base 9 of the three-dimensional control base 2 of the camera passes through a forward and backward track 10 and a forward and backward threaded rod.

11 The positioning and adjusting chassis 12 is provided, and the positioning and adjusting chassis 12 is set on the forward and backward track 10; the positioning and adjusting chassis 12 is provided with a horizontal adjusting screw 13 and a horizontal adjusting chassis 14, and a lifting rail is fixed to the surface of the horizontal adjusting chassis 14 perpendicularly 15 and a lifting adjusting screw 16, the lifting rail 15 and the lifting adjusting screw 16 are connected to a platform 18 of an infrared perspective camera through a fixing plate 17 fitted on the lifting rail 15 and the lifting adjusting screw 16.

As shown in FIG. 1, the three-dimensional camera control base 2, the infrared perspective camera 1 and the human thermal field control base 20 are all placed in the same temperature control room 19.

Using the present invention, more than 100 people voluntarily performed fluoroscopy and verification of different parts, and all achieved the expected shape and function display effect. Refer to Figure 7. This is an infrared perspective view of the chest of a 22-year-old normal male. In the figure, the heart and lungs are clearly displayed and conform to the normal anatomical morphology. The surrounding adjacent structures, such as the ascending aorta and pleural reflex, are all good. None Abnormal temperature changes, function is normal. As shown in Figure 6, it is a retro-perspective tomogram of the abdomen of a normal 33-year-old man. The enlarged pancreatic morphology can be seen. The adjacent superior mesenteric vein, splenic vein, portal vein, and superior mesenteric artery are clearly displayed. . And these deep blood vessels, without the injection of contrast agents, other current imaging methods (such as X-ray, CT, nuclear magnetic resonance, etc.) can not or difficult to display the shape and function at the same time (Note: MRI without injection contrast In the case of agents, it is necessary to use expensive high magnetic field equipment to show blood vessels). The direction of infrared tomographic observation of coronary tomography is a natural viewing direction, which is easier to locate, identify, and analyze than CT and MRI cross-sectional images, and also includes a larger field of view than CT and MRI.

Claims

Rights request

1. A medical infrared fluoroscopy method, comprising the following steps:

The medical infrared fluoroscopy method according to claim 1, characterized in that a certain section of the thermal field of the human body intercepted by computer control is controlled in the following three ways:

① Sitting position. Standing position. Control of lying position;

② The orientation of the above postures is precisely controlled;

③ control of limb position;

(2) The automatic control of the overall position of the infrared optical system by the computer and its corresponding software through the camera three-dimensional control base, which includes:

② Manual: Adjust the steps at any time according to actual needs;

(3) The automatic control of the position of each component in the infrared optical system by a computer and its corresponding software through a dedicated servo motor system, which includes-

② Manual: Adjust the steps at any time according to actual needs;

The medical infrared fluoroscopy method according to claim 1, characterized in that the processes of pseudo-color display, temperature window selection and upper and lower limit adjustment, ribbon editing and color editing include: (1) Ribbon adjustment steps for pseudo-color display

① Ribbon length adjustment steps,

② Ribbon color ratio adjustment steps;

(2) steps for adjusting the upper and lower limits of the temperature window and the absolute value of the distance;

(3) Ribbon editing: the adjustment step of replacing the colors in the ribbon;

(4) Color editing:

① Tone adjustment steps for full color and color separation,

② Full color and color separation brightness adjustment steps,

③ Full color and color separation contrast adjustment steps,

④ Full color and color separation blackness adjustment steps;

(5) Real-time image processing:

① steps of field-of-view lock, zoom, and scale control,

② Smoothness adjustment steps,

③ Multi-layer image overlay step;

(6) Display steps:

Scan the imaging frame observed during the imaging process,

The image display box that has completed the scanning and imaging process,

② Automatically form the examinee's folder and serialized various file names;

④ Automatically enter the database storage for easy network use.

The medical infrared fluoroscopy method according to claim 1, characterized in that the line scanning uses a unidirectional rotating reflective cylinder, and the reflection surface thereof is a quasi-sinusoidal surface, so as to realize fast linear and progressive two-way scanning.

5. The infrared fluorometer manufactured by the method according to claim 1, characterized in that: it comprises a three-dimensional camera control base (2), an infrared fluoroscopic camera (1), and a human body thermally connected to the computer of the console (3) respectively. The field control base (20) is provided with a human body thermal field control base (20) at a position corresponding to the infrared perspective camera (1) provided on the camera three-dimensional control base (2).

The infrared fluorometer according to claim 5, characterized in that: the infrared fluoroscopic camera (1) mainly comprises a frame-scanning concave mirror (6), a line-scanning reflector (21), and a single crystal germanium lens (5, 7) ) And an infrared detector, the incident light path of the frame-scanning concave mirror (6) driven by the motor and continuously swinging behind the single crystal germanium lens (5) corresponds to the thermal field of the human body, and the line-scanning mirror (21) driven by the motor ) Is set at the focal point of the frame-scanning concave mirror (6), and the reflection light path of the line-scanning mirror (21) corresponds to the single crystal germanium lens (7) located before the infrared detector (8).

The infrared fluorometer according to claim 6, characterized in that: the scanning mirror (21) is a bidirectional scanning cylinder (23) of a quasi-sinusoidal surface driven by a motor and rotated in one direction, and the quasi-sine wave number of the circumference is 4 ω 20.

The infrared fluorometer according to claim 5, 6, or 7, characterized in that: the base (9) of the three-dimensional control base (2) of the camera is arranged on the base (9) through a forward / backward track (10) and a forward / backward threaded rod (11). Positioning and adjusting chassis (12), the positioning and adjusting chassis (12) is set on the forward and backward track (10); the positioning and adjusting chassis (12) is provided with a horizontal adjustment screw (13) and a horizontal adjustment chassis (14), perpendicular to A lifting rail (15) and a lifting adjusting screw (16) are fixed on the level adjusting chassis (14), and the lifting rail (15) and the lifting adjusting screw (16) are connected to the infrared perspective through a fixing plate (17) fitted on the lifting rail (15) and the lifting adjusting screw (16). Camera platform (18).

The infrared fluorometer according to claim 8, characterized in that: the camera three-dimensional control base (2), the infrared fluoroscopic camera (1) and the human thermal field control base (20) are all arranged in the same temperature control room (19) Inside.