JP5859754B2 - Magnetic resonance imaging apparatus and program - Google Patents

Description

  The present invention relates to a magnetic resonance imaging apparatus and a program for scanning the subject while the subject holds his / her breath.

  When imaging a subject using a magnetic resonance imaging apparatus, in order to reduce body motion artifacts due to respiration, a method is known in which a subject is held for breathing and scanned (see Patent Document 1).

JP 2010-094238 A

  When setting the scan range of the breath-hold scan, the operator needs to set scan conditions such as the number of slices so that the breath-hold time of the subject is not as long as possible from the viewpoint of reducing the burden on the subject. Therefore, the operator adjusts the scanning conditions such as reducing the number of slices if the scanning time seems too long while referring to the scanning time determined by the scanning conditions. However, if the number of slices is reduced too much, the range that can be scanned becomes narrow, so that it is not possible to set slices to cover the entire region of interest. Therefore, it is important for the operator to be able to recognize how much the number of slices can be increased or decreased when adjusting the scanning conditions. However, in practice, there is a problem that it is difficult for the operator to recognize how much the number of slices can be increased or decreased. Therefore, it is desirable to be able to easily recognize how much the number of slices can be increased or decreased.

According to a first aspect of the present invention, there is provided a magnetic resonance imaging apparatus that executes a scan of the subject in a state where the subject holds a breath.
Means for obtaining a scannable range capable of scanning within the breath holding time of the subject;
Display means for displaying the scannable range;
A magnetic resonance imaging apparatus.

According to a second aspect of the present invention, there is provided a program for a magnetic resonance imaging apparatus that scans the subject while the subject holds the breath.
A process for obtaining a scannable range that can be scanned within the breath holding time of the subject;
Display control processing for displaying the scannable range on a display unit;
Is a program that causes a computer to execute.

  In the present invention, the scannable range that can be scanned within the breath holding time of the subject is displayed, so it is possible to easily recognize how much the number of slices can be increased or decreased.

1 is a schematic diagram of a magnetic resonance imaging apparatus according to a first embodiment of the present invention. It is explanatory drawing of the scan performed with a 1st form. 2 is a diagram showing a processing flow of the MRI apparatus 100. FIG. FIG. 4 is a diagram schematically showing positioning image data DA displayed on a display unit 11. It is a figure which shows a slice position. It is explanatory drawing of spacing. Is a diagram illustrating an example of an input value of the breath holding time T _s. It is a figure which shows an example of the display method of another scanning range in which a scan is possible. Another scan range R _a slice positions Q ₁ to Q _x is a diagram showing a state in which changed to a solid line. It is a diagram showing how the slice positions Q ₁ to Q _x is deleted. It is a figure which shows a mode that only the slice position of the upper half of the liver remained. It is a figure which shows _scannable range _Rm1 . The number of slices of different scan range R _a is a diagram showing an example of scan range R _m1 when the change. It is a figure which shows a mode when scanable range _Rm0 is adjusted. It is a figure which shows an example of the method of displaying the range which can be scanned, and the range which cannot be scanned. It is a figure which shows _scannable range _Rm1 . It is a figure which shows a pop-up window. It is the schematic which shows the MRI apparatus of a 2nd form. It is a figure which shows the processing flow in a 2nd form. Is a diagram illustrating an example of an input value of the breath holding time T _s. It is a figure which shows an example of _scannable range _Rmax . FIG. 6 is a diagram showing a scan range R.

  Although the form for inventing is demonstrated, this invention is not limited to the following forms.

(1) First Embodiment FIG. 1 is a schematic diagram of a magnetic resonance imaging apparatus according to a first embodiment of the present invention.

  A magnetic resonance imaging apparatus (hereinafter referred to as “MRI apparatus”. MRI: Magnetic Resonance Imaging) 100 includes a magnet 2, a table 3, a receiving coil 4, and the like.

  The magnet 2 has a bore 21 in which the subject 12 is accommodated. The magnet 2 includes a superconducting coil 22, a gradient coil 23, and an RF coil 24.

The table 3 has a cradle 3 a that supports the subject 12.
The receiving coil 4 receives a magnetic resonance signal from the subject 12.

  The MRI apparatus 100 further includes a sequencer 5, a transmitter 6, a gradient magnetic field power supply 7, a receiver 8, a central processing unit 9, an operation unit 10, and a display unit 11.

  The sequencer 5 sends signals to the transmitter 6 and the gradient magnetic field power source 7 under the control of the central processing unit 9.

  The transmitter 6 outputs a drive signal for driving the RF coil 24 based on the signal from the sequencer 5.

  The gradient magnetic field power supply 7 outputs a drive signal for driving the gradient coil 23 based on a signal from the sequencer 5.

  The receiver 8 performs signal processing on the magnetic resonance signal received by the receiving coil 4 and outputs data obtained by the signal processing to the central processing unit 9.

  The central processing unit 9 controls the operation of each unit of the MRI apparatus 100 such as transmitting necessary information to the sequencer 5 and the display unit 11 and reconstructing an image based on data received from the receiver 8. The central processing unit 9 is constituted by a computer, for example.

  The central processing unit 9 includes an image data creation unit 90 to a scan condition change unit 95.

The image data creation means 90 creates image data based on the data received from the receiver 8.
The display control unit 91 controls the display on the display unit 11.
The maximum slice number calculation unit 92 calculates the maximum number of slices that can be set within the breath holding time of the subject.
The slice number comparison means 93 compares the maximum number of slices with the number of slices in the scan range.
The scan range changing unit 94 changes the scan range.
The scan condition changing unit 95 changes the scan condition.

  The central processing unit 9 is an example of the image data creating unit 90 to the scan condition changing unit 95, and functions as these units by executing a predetermined program. A combination of the maximum slice number calculation unit 92 and the slice number comparison unit 93 corresponds to a unit for obtaining a scannable range.

The operation unit 10 is operated by an operator and inputs various information to the central processing unit 9. The display unit 11 displays various information.
The MRI apparatus 100 is configured as described above.

FIG. 2 is an explanatory diagram of the scan executed in the first mode.
In the first mode, a positioning scan and a breath holding scan are executed.

  The positioning scan is a scan for acquiring positioning image data. The positioning image data is data used to determine the slice position in the breath holding scan. The breath-hold scan is a scan performed while the subject holds the breath.

FIG. 3 is a diagram showing a processing flow of the MRI apparatus 100.
In step ST1, a positioning scan is performed. After performing the positioning scan, the process proceeds to step ST2.

  In step ST2, the image data creating means 90 (see FIG. 1) creates positioning image data based on the data obtained by the positioning scan. When the positioning image data is created, the display control unit 91 (see FIG. 1) causes the display unit 11 to display the positioning image data. FIG. 4 schematically shows the positioning image data DA displayed on the display unit 11. The positioning image data DA includes the liver. After the positioning image data DA is displayed on the display unit 11, the process proceeds to step ST3.

  In step ST3, the operator sets the slice position so as to cover the region of interest while referring to the positioning image data DA. In this embodiment, the region of interest is the liver. The operator operates the operation unit 10 to set the slice position. The display control unit 91 displays the slice position on the display unit 11 (see FIG. 5).

FIG. 5 is a diagram showing slice positions.
In FIG. 5, n slice positions P _{1 to} P _n are set in the positioning image data DA. Therefore, the number of slices is n. Note that the slice thickness and spacing values may be set by the operator in step ST3, or may be values set in advance as initial values. Note that the spacing is an interval between adjacent slices as shown in FIG.

  In this way, the scan range R of the breath holding scan is set. When the scan range R is set, the process proceeds to step ST4.

In step ST <b> 4, the operator operates the operation unit 10 and inputs a breath holding time T _s that can hold the subject 12. FIG. 7 shows an example (15 seconds) of the input value of the breath holding time T _s . Instead of inputting the breath holding time T _s by the operator, the breath holding time T _s may be set in advance as an initial value. After inputting the breath holding time T _s , the process proceeds to step ST5.

In step ST5, the maximum slice number calculation means 92 (see FIG. 1) calculates the maximum number m of slices that can be set within the breath-holding time T _s based on the scanning conditions when performing the breath-hold scanning. calculate. Then, the slice number comparison means 93 (see FIG. 1) compares the maximum number m of slices with the slice number n set in step ST3, and whether m> n, m <n, or m = n. Determine. If m> n, the process proceeds to step ST6. If m <n, the process proceeds to step ST11. If m = n, the process proceeds to step ST12. In the following, description will be given separately for each of m> n, m <n, and m = n.

(A) When m> n When it is determined in step ST5 that m> n, the process proceeds to step ST6.

In step ST6, the display control unit 91 causes the display unit 11 the breath time _{T s} in the scan capable scannable range _{R m0.}

FIG. 8 is a diagram illustrating an example of a method for displaying the _scannable range R _m0 .
When m> n, it means that the maximum number m of slices that can be set within the breath holding time T _s is larger than the number n of slices in the scan range R set by the operator in step ST3. Therefore, the _scannable range R _m0 that can be scanned within the breath holding time T _s is wider than the scan range R. Therefore, scanning range R _m0 is displayed by a combination of the scanning range R, and scanning another scan range R _a as possible.

The scan range R (slice positions P _{1 to} P _n , the number of slices n) is represented by a solid line, and another scan range R _a (slice positions Q _{1 to} Q _x , the number of slices x) is represented by a broken line. The number of slices of different scanning range R _a x is represented by the difference between the maximum number m of slices of the scan range R _m0, the number of slices n scanning range R.

The scan range R _m0 includes the scan range R. Therefore, the operator can see that the scan range R can be scanned during the breath holding time T _s by looking at the display unit 11. Furthermore, another scan range _Ra is included in the _scannable range R _m0 . Therefore, the operator can see that the number of slices can be increased by a maximum of x by looking at the display unit 11. Incidentally, the scanning range R and another scan range R _a, may be distinguished by color.
After displaying the another scan range _{R a,} the process proceeds to step ST7.

  In step ST7, the operator determines whether or not to change the scan conditions (for example, scan parameters such as the slice thickness t and the repetition time TR) when executing the breath holding scan. If the operator determines not to change any scan conditions, the process proceeds to step ST9. On the other hand, when the operator determines to change the scanning condition, the process proceeds to step ST8. In the following, a case where the operator first determines not to change the scan condition will be described. In this case, the process proceeds to step ST9.

In step ST9, the operator determines the scan range of the breath holding scan while referring to the scannable range R _m0 . The operator can determine an arbitrary range as the scan range of the breath-hold scan as long as it is within the scannable range R _m0 . For example, the operator, when considered with the image data of the another scan range R _a is also helpful in the diagnosis of the subject operates the operation unit 10, the scanning range R of the another scan range R _a also breath scan Enter a scan range change command to include. When the scan range changing instruction is inputted, the scan range changing means 94 (see FIG. 1) is, in accordance with the scan range changing instruction to change as another scanning range R _a is also included in the scan range R of breath scan. At this time, the display control unit 91, a slice position Q ₁ to Q _x of the another scan range R _a is controlled so as to change from the broken line in the solid line (see FIG. 9). Therefore, the operator can visually recognize that the slice positions Q _{1 to} Q _x are also included in the scan range R of the breath holding scan.

On the other hand, when the operator determines that the slice positions Q _{1 to} Q _x do not need to be included in the scan range, only the slice positions P _{1 to} P _n are determined as the scan range. In this case, the operator operates the operation unit 10 and inputs a command for deleting the slice positions Q _{1 to} Q _x . When this command is input, the slice positions Q _{1 to} Q _x are deleted (see FIG. 10). Therefore, the operator can visually recognize that the slice positions Q _{1 to} Q _x are not included in the scan range R.

  Further, when the operator wants to scan only the upper half of the liver, the operator inputs an instruction to leave only the upper half slice position of the liver and delete other slice positions. When this command is input, only the upper half slice position of the liver remains (see FIG. 11). Therefore, the operator can visually recognize that only the upper half slice position of the liver is included in the scan range R.

  When the scan range is determined as described above, the process proceeds to step ST10. In step ST10, the operator clicks the start button 11a for starting the breath holding scan. When this button 11a is clicked, a breath holding scan is executed and the flow ends.

The display unit 11 displays a _scannable range R _m0 that can be scanned within the breath holding time T _s . Scan range R _m0, in addition to the scanning range R, contains another scan range R _a possible scanning. Therefore, the operator can see that the scan range R can be scanned during the breath holding time T _s by looking at the display unit 11. Furthermore, the operator, during the breath-hold time T _s, as well as the scanning range R, another scan range R _a it can be seen that scanning is possible. Therefore, the operator can visually recognize how many slices can be increased only by looking at the display unit 11.

  In the above description, the case where the operator does not change the scan condition in step ST7 has been described. However, the operator may change the scan condition as necessary. If the operator determines in step ST7 that the scan condition is to be changed, the process proceeds to step ST8.

In step ST8, the scan condition is changed. The operator operates the operation unit 10 and inputs a command for changing the scan condition. When this command is input, the scan condition changing unit 95 (see FIG. 1) changes the scan condition. When the scanning condition is changed, the display control unit 91 changes the scanable range R _m0 displayed on the display unit 11 in accordance with the change of the scanning condition. FIG. 12 shows a _scannable range R _m1 when the slice thickness t is increased (the interval between slice positions is increased) as an example in which the scan condition is changed. When the scan condition is changed, the scanable range R _m1 after changing the scan condition is displayed, so that the operator can easily check the scanable range R _m1 after changing the scan condition. . In FIG. 12, the maximum number of slices in the _scannable range R _m1 is m. However, when the operator changes the scan condition in step ST8, the maximum number of slices may change depending on the changed scan condition. In this case, the display control unit 91 changes the scannable range as follows (see FIG. 13).

FIG. 13 is a diagram illustrating an example of the _scannable range R _m1 when the maximum number of slices changes.

FIG. 13 shows a case where the maximum number of slices is changed from m to k. In this case, the number of slices of different scanning range R _a is changed from x Like the y sheets. Therefore, the operator can slice the number of different scan range R _a is easy to visually recognize that changes to y sheets.
After changing the scanning conditions, the process proceeds to step ST9.

In step ST9, the operator determines the scan range of the breath-hold scan while referring to the scannable range R _m1 after changing the scan condition. The method for determining the scan range is the same as the method shown in FIGS. When the slice position is determined, the process proceeds to step ST10, a breath holding scan is performed, and the flow ends.

  When the operator changes the scan condition, the scanable range after changing the scan condition is displayed, so the operator can easily confirm the scanable range after changing the scan condition.

In step ST6, after displaying the _scannable range Rm0, before proceeding to step ST7, the position of the _scannable range _Rm0 may be adjusted as necessary (see FIG. 14).

FIG. 14 is a diagram illustrating a state when the _scannable range R _m0 is adjusted.
Figure 14 (a) shows a scanning range _{R m0} before adjustment, FIG. 14 (b) shows a scanning range _{R m0} after adjustment.

When the operator wants to adjust the position of the _scannable range R _m0 , the operator operates the operation unit 10 to adjust the position of the _scannable range R _m0 . Thus, by adjusting the position of the _scannable range R _m0 , the operator can position the _scannable range R _m0 at an optimal position.
Next, the case where it is determined in step ST5 that m <n will be described.

(B) When m <n When it is determined in step ST5 that m <n, the process proceeds to step ST11.

In step ST11, the display control unit 91 causes the display unit 11 to display a _scannable range R _m0 in which the breath holding scan can be performed within the breath holding time T _s .

FIG. 15 is a diagram illustrating an example of a method for displaying the _scannable range R _m0 .
When m <n, this means that the maximum number m of slices that can be set within the breath holding time T _s is smaller than the number n of slices in the scan range R set by the operator in step ST3. Accordingly, the _scannable range R _m0 that can be scanned within the breath holding time T _s is narrower than the scan range R. For this reason, the scan range R is divided into a _scannable range R _m0 and a range R _b that cannot be scanned.

The scanable range R _m0 (slice positions P _{1 to} P _m , the number of slices m) is represented by a solid line, and the unscannable range R _b (slice positions P _{m + 1 to} P _n , the number of slices x) is represented by a one-dot chain line. Has been. The number of slices x in the unscannable range _Rb is represented by the difference between the number of slices n in the scan range R and the maximum number m of slices in the _scannable range _Rm0 .

Since the _scannable range R _m0 is narrower than the scan range R set by the operator, the operator can see that the scan range R cannot be scanned during the breath holding time T _s by looking at the display unit 11. Note that the _scannable range R _m0 and the unscannable range R _b may be distinguished by color.
After displaying the unscannable range _Rb , the process proceeds to step ST7.

In step ST7, the operator determines whether or not to change the scan conditions (for example, scan parameters such as the slice thickness t and the repetition time TR) when executing the breath holding scan. Referring to FIG. 15, since the scanable range R _m0 does not cover a part of the region of interest (liver), the entire region of interest cannot be scanned as it is. Therefore, the operator determines to change the scan condition so that the scanable range R _m0 covers the entire region of interest. Accordingly, the process proceeds to step ST8.

In step ST8, the scan condition is changed. The operator operates the operation unit 10 and inputs a command for changing the scan condition. When this command is input, the scan condition changing unit 95 (see FIG. 1) changes the scan condition. When the scanning condition is changed, the display control unit 91 changes the scanable range R _m0 displayed on the display unit 11 in accordance with the change of the scanning condition. FIG. 16 shows a _scannable range R _m1 when the slice thickness t is increased (the interval between slice positions is increased) as an example in which the scan condition is changed. By increasing the slice thickness t, the scanable range R _m1 is expanded, so that the entire region of interest can be included in the scanable range R _m1 . If the scanning conditions are changed, the process proceeds to step ST9.

In step ST9, the operator operates the operation unit 10 and inputs a command for setting the _scannable range _Rm1 as the scan range of the breath-hold scan. Therefore, the scannable range R _m1 is determined as the scan range of the breath holding scan. After determining the scan range, the process proceeds to step ST10, and the start button 11a is clicked. As a result, a breath holding scan is executed, and the flow ends.

The display unit 11 shows a _scannable range R _m0 (see FIG. 15) that can be scanned within the breath holding time T _s . Therefore, the operator can visually recognize that the scan range R set by the operator cannot be scanned within the breath holding time T _s by looking at the display unit 11. When the operator changes the scan condition, the operator can see the _scannable range R _m1 (see FIG. 16) after the scan condition is changed, so whether or not the _scannable range R _m1 covers the region of interest. Can be confirmed visually.
Next, a case where m = n is determined in step ST5 will be described.

(C) When m = n When it is determined in step ST5 that m = n, the process proceeds to step ST12.

In step ST12, the display control unit 91 displays information indicating that “the number of slices in the scan range R matches the maximum number of slices that can be set within the breath holding time T _s ”. For example, as shown in FIG. 17, a message stating “The number of slices in the scan range R matches the maximum number of slices that can be set within the breath holding time T _s ” is displayed. Therefore, the operator knows that the scan range R can be scanned within the breath holding time T _s . After displaying the message, the process proceeds to step ST10, and the operator clicks the start button 11a for starting the breath holding scan. When this button 11a is clicked, a breath holding scan is executed and the flow ends.

As described above, in the present embodiment, since the scanable range R _m0 is displayed on the display unit 11, the operator looks at the display unit 11 so that the scan range R set by the operator is within the breath holding time T _s . It is possible to easily recognize whether or not scanning is possible. Therefore, the operator can easily increase or decrease the number of slices as necessary.

(2) Second Embodiment FIG. 18 is a schematic diagram showing an MRI apparatus of the second embodiment.
The MRI apparatus 200 of the second embodiment does not include the slice number comparison means 93, but the other configurations are the same as those of the MRI apparatus 100 of the first embodiment.

FIG. 19 is a diagram showing a processing flow in the second embodiment.
Steps ST1 and ST2 are the same as those in the first embodiment, and a description thereof will be omitted. After the positioning image data DA is displayed on the display unit 11 (see FIG. 4), the process proceeds to step ST3.

In step ST3, the operator operates the operation unit 10 to input the breath holding time T _s of the subject 12. FIG. 20 shows an example (15 seconds) of the input value of the breath holding time T _s . Instead of inputting the breath holding time T _s by the operator, the breath holding time T _s may be set in advance as an initial value. After inputting the breath holding time T _s , the process proceeds to step ST4.

In step ST4, the operator clicks the scanable range display button 11b. Scan range display button 11b is a button for displaying a scan range that can be scanned within a breath holding time T _s. When the button 11b is clicked (see Fig. 1) slice maximum number calculating means 92 calculates the maximum number m of which can be set in a breath-hold time T _s slice. It is assumed that necessary conditions for calculating the number of slices (for example, slice thickness t, spacing SP, repetition time TR) are set in advance. When the maximum number m of slices is calculated, the process proceeds to step ST5.

In step ST5, the display control unit 91 causes the display unit 11 the scanning range R _m which can be scanned within a breath holding time T _s.

Figure 21 is a diagram showing an example of a scan range R _m. In Figure 21, the scanning range _{R m} is represented by the solid line (slice position _P 1 ~P _n). After displaying the scanning range _{R m,} the process proceeds to step ST6.

  In step ST6, the operator operates the operation unit 10 and inputs information for determining the scan range R of the breath holding scan. By inputting this information, the scan range R can be determined as shown in FIG. When the slice position R is determined, the process proceeds to step ST7, and the operator clicks the start button 11a for starting the breath holding scan. When this button 11a is clicked, a breath holding scan is executed and the flow ends.

In the second embodiment, the operator can visually recognize the scan range R _m. Thus, as fits the scan range R _m, a scan range R can be readily determined.

Incidentally, there may be a case where the scan range R _m is narrower than the region of interest (liver). In this case, the operator may adjust the scanning conditions. By adjusting the scanning condition, the scanable range R _m can be made wider than the region of interest, so that the operator can determine the slice position so as to cover the entire region of interest.

2 Magnet 3 Table 3a Cradle 4 Receiving coil 5 Sequencer 6 Transmitter 7 Gradient magnetic field power supply 8 Receiver 9 Central processing unit 10 Operation unit 11 Display unit 12 Subject 21 Bore 22 Superconducting coil 23 Gradient coil 24 Transmitting coil 100, 200 MRI apparatus

Claims (14)

A magnetic resonance imaging apparatus for performing a scan of the subject in a state where the subject holds his / her breath,
A means for obtaining a scannable range that can be scanned within the breath holding time of the subject, calculating the maximum number of slices that can be set within the breath holding time, and the maximum number of slices, Means for determining the scannable range based on the slice thickness of the slice;
Changing means for changing the slice thickness;
Display means for displaying the scannable range, and when the slice thickness is changed, display means for displaying the scannable range after the slice thickness is changed;
Have
The display means includes
When the maximum number of slices is greater than the number of slices in the scan range when scanning the subject, the scanable range is displayed in combination with the scan range and another scan range that can be scanned. The magnetic resonance imaging apparatus. The means for obtaining the scannable range is:
The magnetic resonance imaging apparatus according to claim 1, wherein the scannable range is obtained based on a maximum number of slices, the slice thickness, and a spacing representing an interval between adjacent slices. The display means includes
The magnetic resonance imaging apparatus according to claim 1, wherein a scanning range when scanning the subject is displayed. The means for obtaining the scannable range is:
The magnetic resonance imaging apparatus according to claim 3, further comprising a slice number comparison unit that compares the maximum number of slices with the number of slices in the scan range. The display means includes
5. The magnetic resonance imaging apparatus according to claim 4 , wherein when the maximum number of slices is smaller than the number of slices in the scan range, the scan range is divided into a scannable range and a scannable range. . The display means includes
Display positioning image data used to determine the slice position;
Wherein on the positioning image data, displays the scanning range, a magnetic resonance imaging apparatus according to any one of claims 1-5. The magnetic resonance imaging apparatus according to claim 6 , wherein a positioning scan for acquiring the positioning image data is executed. Position of the scan range is adjustable, magnetic resonance imaging apparatus according to any one of claims 1-7. The display means includes
A display unit;
Display control means for controlling display of the display unit;
The a, a magnetic resonance imaging apparatus according to any one of claims 1-8. An operation unit operated by an operator, the operation unit inputting a command for changing the slice thickness;
The changing means changes the slice thickness based on said instruction, a magnetic resonance imaging apparatus according to any one of claims 1-9. A program of a magnetic resonance imaging apparatus that scans the subject while the subject holds his / her breath,
A process for obtaining a scannable range that can be scanned within the breath holding time of the subject, calculating the maximum number of slices that can be set within the breath holding time, and the maximum number of slices, A process for obtaining the scannable range based on the slice thickness of the slice;
A change process for changing the slice thickness;
Display control processing for displaying the scannable range on a display unit, and when the slice thickness is changed, display control processing for displaying the scannable range after the slice thickness is changed on the display unit; ,
Is a program that causes a computer to execute
The display control process includes:
When the maximum number of slices is larger than the number of slices in the scan range when scanning the subject, the scanable range is displayed in combination with the scan range and another scan range that can be scanned. A program that performs processing for . The process for obtaining the scannable range is as follows:
12. The program according to claim 11 , further comprising a process of obtaining the scannable range based on the maximum number of slices, the slice thickness, and a spacing representing an interval between adjacent slices. The display control process includes:
The program according to claim 12 , comprising a process for causing the display unit to display a scan range when scanning the subject. The process for obtaining the scannable range is as follows:
The program according to claim 13 , comprising a slice number comparison process for comparing the maximum number of slices with the number of slices in the scan range.

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