JPH11104105A - Magnetic resonance imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic resonance imaging device provided with display processing and retrieval processing functions which can be used to facilitate the setting of a pulse sequence to be executed. SOLUTION: This magnetic resonance imaging device applies inclined magnetic field and high-frequency magnetic field to a subject in a static magnetic field according to a specified pulse sequence, and monitors excited magnetic resonance signals. The magnetic resonance imaging device is provided with a display means 22 and 24 which makes data collecting conditions in a pulse sequence match with vectors and displays coordinates corresponding to the data collecting conditions in a specified vector space, a setting means 22 and 24 which set a new data collecting condition corresponding to a pulse sequence to be executed by changing data collecting conditions in the vector space, and an execution means 20 which executes a pulse sequence corresponding to a newly set data collecting condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention facilitates setting of a pulse sequence to be executed when observing a morphological image or a metabolite distribution (metabolite distribution image) inside a subject by utilizing a magnetic resonance phenomenon. The present invention relates to a magnetic resonance imaging apparatus provided with a display processing and a search processing function for performing the processing.

[0002]

2. Description of the Related Art Magnetic resonance imaging (MRI)
ance Imaging)) With the development of the apparatus and the pulse sequence used therein, the types of image / spectral data that can be imaged have been dramatically increased.

A doctor or operator selects one of these many pulse sequences and collects data according to the symptoms of the patient (subject). An executable pulse sequence is T
It is defined by many data collection conditions such as R and TE, and when changing each condition, the values in the table in which these default values are described are appropriately rewritten. From the interpretation result of the obtained data, the pulse sequence that needs to be imaged next is selected, and if the parameter needs to be changed, the values in the table are rewritten again, and the image and spectrum data are collected sequentially. The aim was to improve diagnostic performance.

In general, first, morphological images such as a proton density image and a relaxation time-enhanced image are collected, and when an abnormality is found in these images, a 3D image and a local image (High resolution image), blood vessel image,
Imaging of a diffusion image or the like is appropriately performed.

[0005] The data types required for diagnosis are often routineized for each hospital, but are selected at any time according to the experience of doctors and operators according to individual cases. In such a case, the set values of the data collection conditions described in the table format described above have been appropriately changed.

[0006]

However, in order to make an appropriate diagnosis for an individual patient, the conditions for collecting useful data for diagnosis from the data collection conditions including a number of data collection modes must be determined. It is necessary for a doctor or an operator to make a sequential determination based on each experience, edit the set values of each condition, and collect data. If data collection conditions are set based on experience, not only may image data that is not necessarily required be collected, but also data that is truly necessary for proper diagnosis is not collected. Or may be. Furthermore, since data collection conditions are input as numerical values in a table format, input errors may occur, or appropriate values may not be set. For this reason, the accuracy of diagnosis may be reduced as well as the restraint time of the patient being extended.

[0007] Similarly, when data collection using a plurality of data collection modes is required, the identification of already collected data and data to be collected in the future becomes complicated, and the same type of image can be repeatedly captured. There was also nature. This has also contributed to prolonging the patient's restraint time.

Further, with respect to the data group collected step by step, the ambiguity that data collected under the data collection conditions applied at the end of the data group differs from the diagnosis result advanced from the data collected before that. If it is found, it will be necessary to collect data again. But,
If data collection was performed from the very beginning, the patient's restraint time would be extended. To avoid this, it is necessary to retroactively study the data acquisition conditions before the pulse sequence in which the ambiguity has occurred. Conventionally, a pulse sequence having the same data collection condition has been executed again from a table in which data collection conditions have been set. For this reason,
Although the ambiguity could be confirmed again, a pulse sequence for finally performing a valid diagnosis could not be set.

[0009]

In order to overcome the above-mentioned problems, the present invention applies a gradient magnetic field and a high-frequency magnetic field to a subject placed in a static magnetic field in accordance with a predetermined pulse sequence, thereby generating an excited magnetic resonance. In a magnetic resonance imaging apparatus for observing a signal, a data acquisition condition of a pulse sequence is made to correspond to a vector, and display means for displaying coordinates corresponding to the data acquisition condition in a predetermined vector space; Setting means for setting new data acquisition conditions corresponding to the pulse sequence to be executed by changing the acquisition conditions; and execution means for executing the pulse sequence corresponding to the newly set data acquisition conditions. A magnetic resonance imaging apparatus is provided.

Here, the display means may be capable of displaying a history of data collection conditions corresponding to the already executed pulse sequence. The display means may be capable of displaying data expected to be collected by a pulse sequence corresponding to the newly set data collection condition.

On the other hand, the present invention may further comprise a database for recording a history of data acquisition conditions corresponding to the already executed pulse sequence. The display means may selectively display a history of data collection conditions recorded in the database.

Further, according to the present invention, in a magnetic resonance imaging apparatus for applying a gradient magnetic field and a high-frequency magnetic field to a subject placed in a static magnetic field in accordance with a predetermined pulse sequence and observing an excited magnetic resonance signal, Display means capable of displaying the history of the data acquisition conditions corresponding to the already executed pulse sequence by associating the data acquisition conditions with the vectors and displaying the coordinates corresponding to the data acquisition conditions in a predetermined vector space. A magnetic resonance imaging apparatus is provided.

(Operation) As described above, by displaying the conditions for collecting the collected data, the properties of the pulse sequence can be visually confirmed. In addition, since the properties of the pulse sequence are visualized, it is easy to change and set the data acquisition conditions of the pulse sequence to be executed next time, irrespective of only experience. For this reason, it is possible to collect image / spectral data necessary and sufficient for diagnosis, and it is possible to minimize the restraint time of the patient. Furthermore, since only information necessary for each case can be collected, highly accurate diagnosis can be performed.

In addition, by saving the history of pulse sequence execution conditions (data collection conditions), it is possible to automatically set data collection conditions necessary for an anticipated case, thereby shortening the examination time. it can.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram schematically showing a magnetic resonance imaging apparatus having a function of displaying and searching for data acquisition conditions including a pulse sequence data acquisition mode according to the present invention.

The magnetic resonance imaging apparatus shown in FIG. 1 has a main magnet 10 and a main magnet power supply 11 for generating a main magnetic field (static magnetic field).
And a gradient magnetic field coil system 12 and a gradient magnetic field power supply 13 for generating a gradient magnetic field having a linear gradient magnetic field distribution in three orthogonal X, Y, and Z axis directions, and a shim coil system 14 including a plurality of shim coils. A shim power supply 15, a high-frequency probe 16 for applying a high-frequency magnetic field and detecting a magnetic resonance signal (a means for adjusting so as to enable detection of multi-nuclide magnetic resonance signals may be used), and a high-frequency probe A transmitter (high-frequency transmission amplifier) 17 for supplying a high-frequency signal to the receiver 16, a receiver 18 for receiving and detecting and amplifying the magnetic resonance signal detected by the probe 16, and predetermined image data from the received magnetic resonance signal Data collecting unit 19 for collecting data, a sequence controller 20 for controlling a pulse sequence, a CPU / memory 21, and a display device 2.
Computer system including workstation 2 (eg, workstation) 23
Composed of

Information relating to pulse sequence data collection conditions and the like is processed in a display / search processing unit 24, and coordinates corresponding to executable pulse sequences are hierarchically displayed on a display device 22 such as a control terminal in a vector space. Is done. An operation of setting a new pulse sequence based on the displayed data collection condition is performed, the information is sent from the display / search processing unit 24 to the pulse sequence storage unit 25, and the pulse sequence changed to the new condition is stored. The signal is transmitted to the sequence controller 19, and the execution of the pulse sequence is started.

Next, the information display processing relating to the pulse sequence and the parameter setting will be described in detail. FIG.
Shows the main acquisition modes that can be acquired by the current magnetic resonance imaging apparatus.

In the MRI acquisition mode, first, a morphological image represented by a proton density image and a relaxation time emphasized image (T1-weighted, T2-weighted) is given. The pulse sequence for collecting these images includes a standard spin echo method, a field echo method, a high-speed imaging method such as an FSE (Fast Spin Echo) method, and an EPI (Echo Planar Imagin).
g) Ultra-high-speed imaging method represented by the method.

As another mode for performing morphological diagnosis,
MRA (Magnetic Resonance) for capturing blood vessel images
Angiography), diffusion-weighted images, perfusion-weighted images, and contrast-enhanced MRI (dynamic MRI) capable of detecting an ischemic site at an early stage. The information obtained from these images reflects not only morphological information but also the function of the organization.

As another typical example of such a functional image, a brain functional image (f-f
MRI), a temperature distribution image capable of obtaining an image reflecting a thermophysiological function, a flow velocity image capable of imaging functional information such as blood flow, and the like.

Further, a mode for collecting spectral data reflecting metabolic information of a living body is set as an MRSI (Magnetic R) mode.
esonance Spectroscopic Imaging) has, in recent years, ¹³ C
-MRS (MRSI) beginning from research to collect brain glucose amino acid metabolism in in-vivo is underway for practical use by high resolution various metabolites in the brain by ¹ H-MRSI Research on a method of collecting energy metabolites using ³¹ P has been actively conducted.

As shown in FIGS. 3A and 3B, these acquisition modes are mainly related to image resolution, ie, the number of spatial dimensions, the number of slices, the number of matrices, the number of slabs, the slice offset position, the number of segments, and the conditions mainly related to image contrast. TR, TE, and Flip angles, and data collection of the presence / absence of a specific molecule (water / fat etc.) suppression pulse, the presence / absence of an inversion pulse, the presence / absence of a decoupling pulse, etc., which are conditions mainly related to emphasis (suppression) of a specific signal component It is characterized by conditions. Furthermore, nuclides ( ¹ H,
^13C , 31P,...) Are also included in the data collection conditions.

These data collection conditions can be understood as a group of parameters that form a vector plane in a multidimensional space as shown in FIG. 4, and the data collection conditions including the data collection mode described above are applied to these vector spaces. Can be mapped. That is, one point on the vector space indicates a specific data acquisition condition, and can be associated with a pulse sequence satisfying these conditions. Therefore, a doctor or an operator can specify an execution pulse sequence by specifying an arbitrary point on a screen of a display device or the like on which the vector space is displayed.

FIG. 5 is a diagram for explaining the concept of the present invention in the case where a pulse sequence is selected and executed by setting these data collection conditions in order to diagnose one case. FIG. 2 shows only the input / output unit of the display device 22 shown in FIG. 1, and a pulse sequence setting window is displayed on the screen.

In order to collect data, it is necessary to select a pulse sequence defined by various data collection conditions. It is conceivable that the pulse sequence that is executed first has a versatile data collection condition regardless of the case and is selected as a default. However, when an appropriate data collection condition is known according to the case, the operator may arbitrarily select and start the examination. In this case, there is a possibility that the inspection time can be reduced by the data collection time of one pulse sequence as compared with the case where the default pulse sequence is executed. Therefore, it is desirable to register the pulse sequence to be executed first for the most suspected case in advance in terms of automation and shortening the examination time.

On the screen, first, the coordinates I0 (black circle) corresponding to the data acquisition condition of the pulse sequence set by default or according to the case are displayed. Where I
0 means that the various data collection conditions described above are represented by one point {pn; n = 1 to N, N = number of parameters} on the vector space. As shown in the figure, the data acquisition conditions of the pulse sequence indicated by the coordinates I0 may be simultaneously displayed on the screen. Here, the coordinate I0 is p
1 = number of spatial dimensions = 2, p2 = number of slices = 1, p3 = slice offset position = 0, p4 = TR = 3000 ms, p5
= TE = 80 ms, p6 = Flip angle = 90 °, p7 = image matrix = 256 × 256, p8 = number of segments = 32, p9
= Fatal suppression, p10 = FSE-T2-weighted image data acquisition condition specified without pulse inversion expressed as pn vector element {pn}.

By reading the data collected by the pulse sequence corresponding to the coordinates I0 specified in this way, if more detailed data is required, the data collection conditions are changed and the next pulse sequence is changed. Execute The coordinate I1 selected in this case is usually the coordinate I
0 is determined in consideration of the collected data, and when the coordinates I0 corresponding to the previously executed pulse sequence are displayed visually and quantitatively, the coordinates I0 are determined.
By changing the data collection condition indicated by 0 on the display device, an appropriate I1 can be set. More specifically, I1 is determined by appropriately selecting a data collection condition that needs to be changed in a vector space by means described later. In the figure, a case is shown in which data of an FSE-T2-weighted image in which the value of TE in the data acquisition conditions has been changed is taken as the coordinate I1 corresponding to the new pulse sequence.

Hereinafter, a plurality of pulse sequences set similarly are executed. When setting the coordinates Ik indicating the data acquisition conditions of the pulse sequence to be executed at the k-th time, if the data acquisition conditions of all the pulse sequences executed before that are visually indicated, the coordinates I0 to Ik− 1
And the set Ik, it is possible to predict the validity and necessity of the obtained information. This is because each pulse sequence Ik represents one point on the vector space indicating the property of the pulse sequence, and the vector reflecting the data acquisition conditions is displayed efficiently spatially, so that the executed pulse Data can be collected while confirming the position of the sequence and the characteristics of the pulse sequence to be executed.

However, since such various data acquisition conditions form an n-dimensional vector space as shown in FIG. 4 and these vectors are independent of each other, the data acquisition conditions are displayed on the image at one time. It is difficult to do.

Although it is conceivable to realize this space by using virtual reality technology in recent years, here,
A specific display method and a setting method of the acquisition mode and the data acquisition condition represented by the k vector will be described below.

As shown in FIG. 5, it is difficult to visually grasp the nature of the pulse sequence being executed simply by listing the data collection conditions by numerical values. It is desirable to display the space vector three-dimensionally.

However, in general, the data collection conditions are multidimensional, which is larger than three dimensions that can be visually displayed independently, and it is difficult to display data effectively as it is.
Therefore, the N data collection conditions represented by {pn} are classified into a three-dimensional or less data collection condition group that can be represented visually independently, and, for example, a three-dimensional vector space is displayed as shown in FIG. It may be displayed on the input / output unit of the device.

In FIG. 6, as one example, data acquisition conditions TR, TE, and flip angles that affect image contrast are defined in a base vector space in three directions, and are displayed as a first layer (FIG. 6). FIG. 6 (a)). As the next layer, the number of spatial dimensions, the number of slices, and the number of matrices are displayed in a base vector space in three directions (FIG. 6).
(B)). The remaining data collection conditions can be visualized using the same hierarchical structure, but it is important to select the same layer that has similar characteristics to be reflected in the image in order to visually set the data collection conditions. It is convenient. Here, an example of classification into a three-dimensional data collection condition group will be described.
The present invention is not limited to this case, but also includes a case of classifying into two-dimensional data collection condition groups and a case of using both three-dimensional and two-dimensional data collection condition groups.

As shown in FIG. 6A, first, the coordinates I0 (black circles) corresponding to the pulse sequence set by default or according to the case are the first hierarchy for selecting TR, TE, and flip angle. Displayed in vector space.
Next, in order to select the TR, TE, and flip angle of the pulse sequence to be executed, the pulse sequence I11 (open circle) is determined by specifying a position corresponding to each set value in the first hierarchical vector space. As shown in the drawing, the pulse sequence before the setting and the pulse sequence after the setting may be displayed differently on the screen, so that the distinction between the two can be made clear. Designation of a position in the vector space can be appropriately performed on an input / output screen using an input device such as a mouse.

When the setting of the data acquisition conditions in the first hierarchy is completed, as shown in FIG. 6B, the pulse sequence I11 (black circle) is used to select the number of spatial dimensions, the number of slices, and the number of matrices. It is displayed in the second hierarchical vector space. The points displayed here are the coordinates that indicate the currently set spatial dimension number, slice number, matrix number, or these default values. Next, to change each parameter value of the number of spatial dimensions, the number of slices, and the number of matrices from this value, the pulse sequence I at the position corresponding to each set value in the second hierarchical vector space
12 (open circle) is determined. Here, a case where only six data acquisition conditions of TR, TE, flip angle, number of spatial dimensions, number of slices, and number of matrices are shown, but in the case of more parameters, based on the same idea, Data collection conditions can be set hierarchically.

In this way, when the last layer (the second layer in FIG. 6) ends, the vector I0 → I1 representing the pulse sequence to be executed is displayed as shown in FIG. If the history of the pulse sequence executed so far is displayed every time the pulse sequence is determined in this way, there is no possibility that the same pulse sequence is executed again by mistake, and the restraint time of the patient is reduced. Elongation can be prevented. Conversely, such a history display indicates what data is missing or
Next, it becomes clear at a glance what data to collect.
The history of the pulse sequence may be stored as a database.

In displaying the history of the pulse sequence, as shown in FIG. 7, the pulse sequence may be simply displayed with names, characters, and symbols reflecting the data collection conditions. For example, FIG.
7, the pulse sequence I0 may be displayed as “T2-weighted image (3000, 80, 90)” in FIG. 7 from the properties of the designated TR, TE, and flip angle. It is also conceivable that the data collection conditions are replaced with names, characters, symbols, and the like that characterize the hierarchy and displayed.

By the way, it is conceivable that the setting of the data collection condition in the new hierarchy may limit the data collection condition in the previously set hierarchy. In such a case, the process of automatically updating the already set value may be performed, or the setting may be performed again. Further, in an actual MRI apparatus, some data acquisition conditions do not allow taking a continuous value arbitrarily, and some data acquisition conditions are subject to certain restrictions. In such a case, the value to be set may not be a settable value, or may be a value exceeding a certain limit. In order to cope with such a case, a function of automatically setting the closest settable value may be provided. As described above, it is desirable to have a function of outputting a warning message as shown in FIG. 8 when the setting value is updated or changed, the setting is redone, or the like. When the set value is changed in this way, the coordinates corresponding to the changed data collection condition may be displayed on the screen.

Further, as an additional processing function, FIG.
As shown in (1), a function of enlarging and displaying the vector space of the corresponding portion may be provided to improve the resolution of the setting and set the data collection conditions in more detail.

After the setting of the pulse sequence is completed based on the data collection condition setting function as described above, the pulse sequence I1 is executed to collect data. After the data collection, when newly collecting data, the same procedure as described above is repeatedly performed.

Next, another method for determining the pulse sequence to be executed will be described. In some cases, the collection mode and data collection conditions may be determined. In such a case, the modes that can be collected are displayed on the screen in advance with symbols, icons, etc., and after specifying these, a sub-window for setting the data collection conditions as described above is displayed and processing is performed. It is also conceivable to have a function. In this case, the acquisition mode is determined first, and the data acquisition conditions in that mode are set using the hierarchical display as described above.

If the data collection conditions in the collection mode have already been determined depending on the case, the symbols and icons indicating the collection mode are lined in the order in which the symbols and icons were clicked using a mouse or the like. It is also conceivable that the connection is made, a network is displayed as shown in FIG. 10, and the pulse sequence is executed according to the network. As described above, when the data collection conditions in the collection mode have already been determined for each case, and those parameters have been registered, I0, I1, I2,... By calling the pulse sequence, the inspection can be automated.

The vector display of the data collection conditions as described above makes it possible to easily and appropriately set the data collection conditions according to each case.
Next, a method of determining a pulse sequence to be executed next using image data that has already been collected, images formed by simulation, and the like will be described.

For example, when an area which is considered to show a lesion is drawn on an image acquired under the initially set data acquisition conditions, and an image with a more detailed contrast than this acquired image is to be acquired, However, it is necessary to partially change the data collection conditions. As described above, this can be performed by changing the vector {pn} shown in FIG. Here, since the data collection conditions for the first hierarchical vector shown in FIG. 6A affect the image contrast, these conditions must be renewed in order to adjust the image contrast. It is desirable to set to. In this case, the data collection condition to be executed next is considered in consideration of the level of the luminance (the level of the peak value of the compound) in the region of interest considered to be a focus on the already collected image and the current data collection condition. Set. At that time, if the expected collection data is displayed simultaneously on the screen for setting the data collection conditions as shown in the figure, it is possible to refer to the contrast of the image that may be collected at the time of the new setting. , New data collection conditions can be set. Although not shown, a reference image corresponding to an already collected image may be displayed adjacent to the expected collection data so that the contrast difference between the two can be directly compared.

Next, a description will be given of a search function of the history of the pulse sequence at the time of collecting data of the same case taken in the past that seems to be the same case. When setting a pulse sequence for a certain case, first, data acquisition conditions are searched from the pulse sequence history (assuming that I0 to Ik are recorded) recorded in the database, and the result is used to determine the next pulse sequence. Is displayed as the expected collected data at the coordinates Ik + 1 corresponding to the data. From the collected data, the data collection condition is I
whether good results can be obtained with k + 1, or
It can be determined whether the vector Ik + 1 of the data collection space needs to be adjusted. By providing such processing, it is possible to greatly shorten the process until reaching the optimum pulse sequence, and to quickly determine data acquisition conditions for obtaining an optimum image.

[0047]

As described above, according to the present invention,
By displaying the pulse sequence data collection conditions and history hierarchically to doctors and operators, it is possible to visually grasp the characteristics of the pulse sequence currently being collected, and It becomes clear at a glance what pulse sequence has been applied. For this reason, it is possible to prevent omission of data collection, as well as to clarify the thought process that has passed for the target case, and to obtain necessary and sufficient diagnostic data without collecting unnecessary data. Become. Also, by storing the history of these data collection conditions in a database, necessary and sufficient data can be automatically collected.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a magnetic resonance imaging apparatus according to the present invention, which can appropriately set data acquisition conditions of a pulse sequence.

FIG. 2 is a diagram showing main acquisition modes executable in MRI.

FIG. 3 is a diagram showing main data acquisition conditions of a pulse sequence.

FIG. 4 is a diagram showing data acquisition conditions of a pulse sequence in a vector space.

FIG. 5 is a view for explaining a setting principle and an execution history of a pulse sequence.

FIG. 6 is a diagram showing an example of displaying data acquisition conditions of a pulse sequence as a condition group.

[Fig. 7] Set data acquisition conditions for pulse sequence
The figure which shows another example which displays.

Fig. 8 Set data acquisition conditions for pulse sequence
The figure which shows another example which displays.

FIG. 9: Setting of data acquisition conditions for pulse sequence
The figure which shows another example which displays.

FIG. 10 is a diagram showing another example of setting and displaying data acquisition conditions of a pulse sequence.

FIG. 11 is a diagram showing another example of setting and displaying data acquisition conditions of a pulse sequence.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Main magnet 11 ... Main magnet power supply 12 ... Gradient magnetic field coil system 13 ... Gradient magnetic field power supply 14 ... Shim coil system 15 ... Shim coil power supply 16 ... High frequency probe 17 ... Transmitter 18 ... Receiver 19 ... Data collection unit 20 ... Sequence controller 21 ... CPU / memory 22 ... Output device 23 ... Computer system 24 ... Information display / search processing unit 25 ... Pulse sequence storage unit

Claims (6)

[Claims] A gradient magnetic field and a high-frequency magnetic field are applied to a subject placed in a static magnetic field in accordance with a predetermined pulse sequence,
In a magnetic resonance imaging apparatus for observing an excited magnetic resonance signal, display means for associating a data acquisition condition of a pulse sequence with a vector and displaying coordinates corresponding to the data acquisition condition in a predetermined vector space, the vector Setting means for setting new data acquisition conditions corresponding to a pulse sequence to be executed by changing data acquisition conditions in a space; and executing the pulse sequence corresponding to the newly set data acquisition condition A magnetic resonance imaging apparatus comprising: 2. The magnetic resonance imaging apparatus according to claim 1, wherein said display means is capable of displaying a history of data acquisition conditions corresponding to the already executed pulse sequence. 3. The apparatus according to claim 1, wherein said display means is capable of additionally displaying data expected to be collected by a pulse sequence corresponding to the newly set data collection condition. Magnetic resonance imaging device. 4. The magnetic resonance imaging apparatus according to claim 1, further comprising a database for recording a history of data acquisition conditions corresponding to already executed pulse sequences. 5. The magnetic resonance imaging apparatus according to claim 4, wherein said display means is capable of selectively displaying a history of data collection conditions recorded in said database. 6. A gradient magnetic field and a high-frequency magnetic field are applied to a subject placed in a static magnetic field according to a predetermined pulse sequence.
In the magnetic resonance imaging apparatus for observing the excited magnetic resonance signal, the data acquisition condition of the pulse sequence is made to correspond to the vector, and the coordinates corresponding to the data acquisition condition are displayed in a predetermined vector space, whereby the pulse that has already been executed is displayed. A magnetic resonance imaging apparatus comprising display means capable of displaying a history of data acquisition conditions corresponding to a sequence.