JP2013052016A - Magnetic resonance imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an MRI (magnetic resonance imaging) apparatus suitable for use when one imaging is interrupted halfway and, subsequently, at least one or more times of imaging is planned and performed again.SOLUTION: The magnetic resonance imaging apparatus includes: a magnetostatic field generation means for generating a uniform magnetostatic field in a space with a subject stored therein; a gradient magnetic field generation means for generating a gradient magnetic field by overlapping with the magnetostatic field; a high frequency magnetic field generation means for generating a high frequency magnetic field for irradiation toward the subject; a detection means for detecting an NMR signal to be generated from the subject; an imaging means for imaging a detected signal; and a control part for controlling the gradient magnetic field generation means, the high frequency magnetic field generation means, the detection means, and the imaging means. The control part includes a planning part for planning multiple times of imaging. The planning part includes a resetting part for resetting a plan to restart imaging even after one of the multiple times of imaging is interrupted during the performance.

Description

  The present invention relates to a magnetic resonance imaging (hereinafter referred to as “MRI”) apparatus, and more particularly to execution control of multiple imaging.

  The MRI device measures NMR signals generated by the spins of the subject, especially the tissues of the human body, and visualizes the form and function of the head, abdomen, limbs, etc. in two or three dimensions Device. In imaging, the NMR signal is given different phase encoding depending on the gradient magnetic field and is frequency-encoded and measured as time-series data. The measured NMR signal is reconstructed into an image by two-dimensional or three-dimensional Fourier transform.

  Here, the MRI apparatus sequentially performs a plurality of series of imaging (for example, three combinations of imaging of positioning images, imaging of T1-weighted images, imaging of T2-weighted images, etc.) while the subject is placed in the imaging space. There are many cases. This is because the MRI apparatus can obtain various different images according to the imaging sequence to be executed. A series of imaging is called a protocol.

  Patent Document 1 discloses a technique related to performing re-measurement when interrupted in the middle of execution of one imaging. Specifically, when MR measurement other than half scan is interrupted, if the number of phase encodings for which MR measurement has finished is slightly over half of the number of phase encodings specified in the measurement conditions, the measurement task will use half as the measurement conditions. There is provided an MRI apparatus that automatically determines that a scan has been designated and enables image reconstruction by a half-scan method.

Japanese Patent No. 3510901

  However, the prior art only discloses a technique related to image reconstruction when interrupted in the middle of imaging, and a technique related to executing a plurality of imaging again after once interrupting the execution of a series of imaging. Was not disclosed.

In order to solve the above-described problems, the present invention provides a static magnetic field generation unit that generates a uniform static magnetic field in a space that accommodates a subject, and a gradient magnetic field generation unit that generates a gradient magnetic field superimposed on the static magnetic field. A high-frequency magnetic field generating means for generating a high-frequency magnetic field for irradiating the subject, a detecting means for detecting an NMR signal generated from the subject, an imaging means for imaging the detected signal, and the gradient magnetic field An MRI apparatus comprising a control unit for controlling the generation means, the high-frequency magnetic field generation means, the detection means, and the imaging means,
The control unit includes a planning unit that plans a plurality of imaging, and the planning unit resets a plan for restarting imaging even after any of the plurality of imagings is stopped during execution. A setting unit is provided.

  In addition, the planning unit plans the order of execution of the plurality of imaging, and the resetting unit includes a replacement unit that switches the order of execution.

  In addition, the resetting unit includes an additional unit that adds an additional imaging plan in addition to the imaging planned by the planning unit.

  In addition, the resetting unit includes a first determination unit that determines whether to capture an image including an image captured at the time of the cancellation.

  In addition, the resetting unit includes a second determination unit that determines whether to perform imaging including imaging planned at the time of cancellation.

  In addition, a recording unit that records the cancellation status at the time of the cancellation, and a presentation unit that presents an optimal resumption protocol according to the cancellation status recorded in the recording unit.

  Further, the button for resuming the imaging consists of a main part and an option part, and the restart protocol can be selected by using the option part.

  An object of the present invention is to provide an MRI apparatus suitable for re-planning and executing at least one imaging after one imaging is interrupted in the middle.

The figure explaining the whole outline | summary of an example of the MRI apparatus which concerns on this invention. FIG. 3 is a block diagram of the CPU 1 in the first embodiment. 1 is a conceptual diagram illustrating the operation of an MRI apparatus according to Embodiment 1 of the present invention. 3 is a flowchart showing an example of the operation of the MRI apparatus in Embodiment 1 of the present invention. FIG. 40 is a view showing a display example in step 39. The figure which shows the example of a display of the menu bar in step 40. FIG. FIG. 14 is a diagram showing a display example of a menu bar in step 41. FIG. 14 is a diagram showing a display example of a menu bar in step 43. FIG. 3 is a block diagram of the CPU 1 in the second embodiment. 6 is a flowchart showing an example of the operation of the MRI apparatus in Embodiment 2 of the present invention. The figure which shows the screen at the time of changing order. The figure which shows the display screen in step 54. FIG. The figure which shows the result of having added imaging-D in step 54. FIG. FIG. 9 is a block diagram of the CPU 1 in the third embodiment. 9 is a flowchart showing an example of the operation of the MRI apparatus in Embodiment 3 of the present invention. The figure which shows the display screen before changing order in Example 4 of this invention. The figure which shows the display screen after changing order in Example 4 of this invention.

  Hereinafter, preferred embodiments of the MRI apparatus of the present invention will be described in detail with reference to the accompanying drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments of the invention, and the repetitive description thereof is omitted.

  First, a static magnetic field generation unit that generates a uniform static magnetic field in a space that accommodates the subject according to the present invention, a gradient magnetic field generation unit that generates a gradient magnetic field superimposed on the static magnetic field, and a high frequency that irradiates the subject High-frequency magnetic field generating means for generating a magnetic field, detecting means for detecting an NMR signal generated from the subject, imaging means for imaging the detected signal, gradient magnetic field generating means, high-frequency magnetic field generating means, and detecting means An overall outline of an example of an MRI apparatus provided with a control unit that controls the imaging means will be described with reference to FIG. FIG. 1 is a block diagram showing the overall configuration of an embodiment of an MRI apparatus according to the present invention. This MRI apparatus uses a NMR phenomenon to obtain a tomographic image of a subject.As shown in FIG. 1, the MRI apparatus includes a static magnetic field generation system 2, a gradient magnetic field generation system 3, a transmission system 5, A reception system 6, a signal processing system 7, a sequencer 4, and a central processing unit (CPU) 8 are provided.

  The static magnetic field generation system 2 generates a uniform static magnetic field in the direction perpendicular to the body axis in the space around the subject 1 if the vertical magnetic field method is used, and in the direction of the body axis if the horizontal magnetic field method is used. Thus, a permanent magnet type, normal conducting type or superconducting type static magnetic field generating source is arranged around the subject 1.

  The gradient magnetic field generation system 3 includes a gradient magnetic field coil 9 that applies a gradient magnetic field in the three-axis directions of X, Y, and Z, which is a coordinate system (stationary coordinate system) of the MRI apparatus, and a gradient magnetic field that drives each gradient magnetic field coil. Gradient magnetic fields Gx, Gy, and Gz are applied in the X, Y, and Z axis directions by driving the gradient magnetic field power supply 10 of each coil according to a command from the sequencer 4 described later. . At the time of imaging, a slice selection gradient magnetic field pulse (Gs) is applied in a direction orthogonal to the slice plane (imaging cross section) to set a slice plane for the subject 1, and the remaining two orthogonal to the slice plane and orthogonal to each other A phase encode gradient magnetic field pulse (Gp) and a frequency encode gradient magnetic field pulse (Gf) are applied in one direction, and position information in each direction is encoded in the echo signal.

  The sequencer 4 is a control unit that repeatedly applies a high-frequency magnetic field pulse (hereinafter referred to as an “RF pulse”) and a gradient magnetic field pulse in a predetermined pulse sequence, operates under the control of the CPU 8, and collects tomographic image data of the subject 1. Various commands necessary for the transmission are sent to the transmission system 5, the gradient magnetic field generation system 3, and the reception system 6.

  The transmission system 5 irradiates the subject 1 with RF pulses in order to cause nuclear magnetic resonance to occur in the nuclear spins of the atoms constituting the living tissue of the subject 1, and includes a high frequency oscillator 11, a modulator 12, and a high frequency amplifier. 13 and a high frequency coil (transmission coil) 14a on the transmission side. The RF pulse output from the high-frequency oscillator 11 is amplitude-modulated by the modulator 12 at the timing according to the command from the sequencer 4, and the amplitude-modulated RF pulse is amplified by the high-frequency amplifier 13 and then placed close to the subject 1. By supplying to the high frequency coil 14a, the subject 1 is irradiated with the RF pulse.

The receiving system 6 detects an echo signal (NMR signal) emitted by nuclear magnetic resonance of nuclear spins constituting the biological tissue of the subject 1, and receives a high-frequency coil (receiving coil) 14b on the receiving side and a signal amplifier 15 And a quadrature phase detector 16 and an A / D converter 17. After the NMR signal of the response of the subject 1 induced by the electromagnetic wave irradiated from the high frequency coil 14a on the transmission side is detected by the high frequency coil 14b arranged close to the subject 1 and amplified by the signal amplifier 15, The quadrature phase detector 16 divides the signal into two orthogonal signals at the timing according to the command from the sequencer 4, and each signal is converted into a digital quantity by the A / D converter 17 and sent to the signal processing system 7.
The signal processing system 7 performs various data processing and display and storage of processing results, and includes an external storage device such as an optical disk 19 and a magnetic disk 18, and a display 20 including a CRT. When data from the receiving system 6 is input to the CPU 8, the CPU 8 executes processing such as signal processing and image reconstruction, and displays the tomographic image of the subject 1 as a result on the display 20, and an external storage device On the magnetic disk 18 or the like.

  The operation unit 25 inputs various control information of the MRI apparatus and control information of processing performed in the signal processing system 7, and includes a trackball or mouse 23 and a keyboard 24. The operation unit 25 is disposed close to the display 20, and the operator controls various processes of the MRI apparatus interactively through the operation unit 25 while looking at the display 20.

  First, Example 1 of the present invention will be described with reference to FIGS. According to the functional block diagram of the CPU 8 shown in FIG. 2, the MRI apparatus according to the first embodiment includes the measurement control unit 8 a that controls various measurements inside, and the measurement control unit 8 a inside. A planning unit 8b that plans a plurality of imagings, and the planning unit 8b resets a plan for resuming imaging even after any of the plurality of imagings is stopped during execution. It has.

  In addition, the resetting unit 8c includes a first determination unit 8d that determines whether to capture an image including an image captured at the time of cancellation. In addition, the resetting unit includes a second determination unit 8e that determines whether to capture an image including imaging planned at the time of cancellation. In addition, a button for resuming imaging is composed of a main part and an option part, and the restart protocol can be selected by using the option part.

  FIG. 3 is a conceptual diagram illustrating the operation of the MRI apparatus according to the first embodiment of the present invention. However, in FIG. 3, (a) is a conceptual diagram showing an operation during imaging, (b) is a conceptual diagram showing an operation when imaging is stopped, and (c) is an operation when imaging is resumed. It is a conceptual diagram. More specifically, FIG. 3 (a) is an example during imaging, and imaging-A (26) is being captured, and imaging-B (27) and imaging-C (28) are scheduled to be captured. It is shown. Also, Fig. 3 (b) shows that imaging is stopped while imaging -A (29) is being imaged, and imaging -B (30) and imaging -C (31) are scheduled. It is recorded in CPU8. FIG. 3 (c) shows a state in which imaging is resumed according to a user instruction.

  FIG. 4 is a flowchart showing an example of the operation of the MRI apparatus in Embodiment 1 of the present invention. Next, each step of the flowchart will be described in order.

(Step 35)
The operator presses the imaging start button on the operation panel, and at the same time, the measurement control unit 8a starts the first imaging of the protocol. For example, the CPU 8 starts T1-weighted imaging.

(Step 36)
After starting the imaging (T1-weighted imaging) input in step 35, the operator inputs at least one type of imaging to be performed next to the MRI apparatus. Here, the one or more types of imaging refers to performing two types of imaging, T2-weighted imaging and FLAIR imaging, after T1-weighted imaging.

(Step 37)
While the imaging (T1-weighted imaging) input in step 35 is being executed, the operator inputs a command to stop the execution of the imaging to the MRI apparatus.

(Step 38)
When the operator inputs an instruction to stop execution in step 37, the CPU 8 stores in the memory (not shown) the imaging information indicating what kind of imaging is being performed and what kind of imaging is planned for the MRI apparatus. .) Specifically, in this embodiment, the fact that T1-weighted imaging is being executed and T2-weighted imaging and FLAIR imaging are scheduled to be executed is recorded in a memory (not shown).

(Step 39)
The measurement control unit 8a displays the imaging information recorded in step 38 on the monitor of the MRI apparatus. Specifically, it is displayed that T1-weighted imaging is being executed and T2-weighted imaging and FLAIR imaging are scheduled to be performed. A display example in this step is as shown in FIG. However, in Fig. 5, the imaging that was being executed and the imaging that was scheduled to be executed are displayed so as to be distinguished, and the ones shown in bold frames are those that were being executed. Show. In FIG. 5, 46 a to 46 c can be easily picked up by operating a check box displayed on the screen when there is an unnecessary image pickup among the image pickup-A to image pickup-C. 47a to 47c indicate that imaging-A to imaging-C are being executed or scheduled, respectively. Reference numeral 48 denotes a start button.

(Step 40)
The operator determines whether to resume imaging. Specifically, as shown in FIG. 6, the start button 48 includes a main part 48a and an option part 48b, which the operator uses. Here, the main part 48a of the start button 48 is for resuming only the imaging (T1-weighted imaging here) that was being imaged when the imaging stop command was input in step 37. Further, the option part 48b of the start button 48 displays a menu bar with a simple operation as shown in FIG. 6 when the cursor 49 is brought close to the option part 48b, and determines whether to resume or end imaging via the menu bar. It can be selected. Specifically, the menu bar is opened when a cursor (to be described later) stays on the option section 48b for a predetermined time or more, or when the cursor is single-clicked. 49 is a cursor, which is the same as that used on personal computers. Reference numeral 50 denotes a menu bar for selecting whether to resume imaging or end imaging. By single-clicking on either of the characters on the menu bar, the user can choose to resume or end imaging. When restarting, the process proceeds to step 41. When not restarting, it ends (End).

(Step 41)
When restarting, the operator determines whether or not to restart including imaging (here, T1-weighted imaging) that was being captured when the imaging stop command was input in step 37. Specifically, when the part of the menu bar in FIG. 6 where “Restart imaging” is clicked, the first determination unit 8d closes the menu bar shown in FIG. A menu bar as if it had been displayed is displayed, and it is possible to select whether to restart including the imaging that was being performed when the imaging stop command was input in step 37 or to resume from the next imaging. When restarting by including, the process proceeds to step 43, and when restarting from the next imaging, the process proceeds to step.

(Step 42)
The measurement control unit 8a captures only the planned imaging (in this case, only T2-weighted imaging and FLAIR imaging) when the imaging stop command is input in step 37.

(Step 43)
The operator determines whether or not to restart including imaging (in this case, T2-weighted imaging and FLAIR imaging) that was planned (reserved) when the imaging stop command was input in step 37. Specifically, when “Resume including imaging that was being captured” is selected from the menu bar in FIG. 7, the second determination unit 8e closes the menu bar shown in FIG. The menu bar as shown in is displayed, and it is possible to select whether to restart with or without including the imaging that was planned when the planned stop command was input in step 37 . When restarting is performed including the imaging that was planned when the command to cancel the plan is input in step 37, the process proceeds to step 45.

(Step 44)
The measurement control unit 8a resumes only the imaging that has been stopped during imaging (here, T1-weighted imaging).

(Step 45)
The measurement control unit 8a captures the image that was stopped during imaging (here, T1-weighted imaging) and the image that was planned (reserved) when the instruction to stop imaging was input in step 37 (here, T2-weighted imaging and FLAIR imaging). ) Is resumed.

  According to the present embodiment, when resuming after stopping the imaging, select a part of all the imagings that have been scheduled for imaging or reservation, etc. Yes.

  Next, Embodiment 2 of the present invention will be described with reference to FIGS. According to the functional block diagram of the CPU 8 shown in FIG. 9, the resetting unit 8c includes a replacement unit 8f that switches the order of execution according to the MRI apparatus according to the second embodiment. The resetting unit 8c includes an adding unit 8g for adding an additional imaging plan in addition to the imaging planned by the planning unit. FIG. 10 is a flowchart showing an example of the operation of the MRI apparatus in the second embodiment of the present invention. Each step of the flowchart will be described in order. However, since steps 35 to 44 are the same as those in FIG. 4, steps 51 to 55 different from FIG. 4 will be described.

(Step 51)
In step 39, the operator determines whether to change the imaging order from the order shown on the display screen shown in FIG. If it is determined to be replaced, the process proceeds to step 52. If it is determined not to be replaced, the process proceeds to step 53.

(Step 52)
When the operator operates the display screen shown in FIG. 5 in step 52, the switching unit 8f switches the imaging order. Specifically, among the images displayed in FIG. 5, when imaging-B is desired to be performed after imaging C due to a change in examination or a change in the physical condition of the subject, the operator performs imaging-C with the mouse. By dragging and dropping between Imaging-A and Imaging-B, the imaging order can be easily changed. For example, the T2 weighted image, which is scheduled to be captured second, and the FLAIR image, which is scheduled to be captured third, are swapped in order to capture the second image, and the T2 weighted image is captured. Is the third imaging plan. Fig. 11 shows what happens to the screen when the order is changed. When the box for Imaging-C is dragged, the replacement unit 8e makes the area between Imaging-A and Imaging-B thick so that it can be inserted. It has been shown to be. (Here, of the images displayed in Fig. 5 again, it is displayed on the screen when it is determined that Imaging-C is unnecessary this time because it takes a long time to wait and many patients are waiting. (You may be able to easily remove it from the imaging target by operating the check box etc.)
(Step 53)
The operator determines whether there is an additional image to be planned (reserved). If it is desired to add an image, the process proceeds to step 49. If it is not desired to add an image, the process proceeds to step 55.

(Step 54)
The operator inputs an image to be added by operating the display screen as shown in FIG. Specifically, when the operator presses the add plan button on the screen of FIG. 12, the adder 8g displays the imaging candidates to be inserted on the examination screen in a separate window, and the mouse drag and drop process allows the user to start Bring it and insert it as shown in Fig. 13 to add imaging.

FIG. 12 also displays all task information (imaging-G to imaging-I) stored in the database of the apparatus as well as those displayed in a separate window. All of these may or may not be displayed on the inspection screen.
When an image to be added is inserted from another window by mouse drag and drop processing, the result is as shown in FIG.
FIG. 13 is an example in which imaging-D, which is higher-resolution imaging than imaging-B and imaging-C, is input.

(Step 55)
Imaging is resumed according to the imaging plan adjusted in step 51 to step.
According to this embodiment, it is possible to change the order of imaging or to add a new imaging, so the order of imaging can be changed depending on the convenience of imaging (e.g., taking images in a short time earlier). It is possible to suitably cope with a case where there is a request for additional imaging due to, for example, wanting to image a diseased place in more detail. Further, it goes without saying that the present embodiment includes a delete button, and by clicking the delete button, it is possible to delete from the imaging protocol when the above-described imaging without a check box is resumed.

Next, Embodiment 3 of the present invention will be described with reference to FIGS.
According to the functional block diagram of the CPU 8 shown in FIG. 14, the MRI apparatus according to the third embodiment includes the storage unit 8 h that stores the cancellation status when the imaging is stopped in step 37. Yes. Further, the resetting unit 8c includes a presentation unit 8i that analyzes the status of the cancellation and presents candidates for how to resume when resuming according to the analysis result.

  FIG. 15 is a flowchart showing an example of the operation of the MRI apparatus in Embodiment 3 of the present invention. However, Example 3 differs from Example 1 and Example 2 in that when imaging is stopped in Step 37, it is provided with a storage unit 8h for storing the status of the cancellation, and analyzing the status of the cancellation. In addition, it is provided with a presentation unit 8i that presents candidates for how to resume when resuming according to the analysis result. Next, each step of the flowchart will be described in order.

(Step 56)
When the operator stops the imaging in step 37, the storage unit 8h records the imaging information and also records the cancellation status. Withdrawal status refers to (A) when the condition of the subject changes, (B) when the subject feels psychological anxiety due to fear of clausiness, which is a particular problem with the MRI device, and (C) real-time This is a case where a lesion is found in the middle of displayed imaging by an image displayed on the screen.

(Step 57)
The CPU 8 determines what the cancellation status at step 56 was. Then, (A) when the condition of the subject has changed, the routine proceeds to step 58. If (B) the subject feels psychological anxiety due to fear of clausiness, which is a unique problem of the MRI apparatus, the process proceeds to step 60. Further, (C) if a lesion is found during the displayed imaging by an image displayed in real time, the process proceeds to step 62.

(Step 58)
The presenting unit 8i is a protocol that restarts after the operator waits until the condition of the subject stabilizes, including the imaging (T1-weighted imaging here) that was being captured when the imaging stop command was input in step 37 Present.

(Step 59)
The measurement control unit 8b restarts including the measurement (in this case, T2-weighted imaging) that was being performed when the measurement stop command was input in step 37.

(Step 60)
The posting unit 8i presents a protocol to be resumed after the operator waits until the subject's psychological anxiety is stabilized.

(Step 61)
The measurement control unit 8b resumes after the condition of the subject is stabilized.

(Step 62)
The posting unit 8i presents a protocol that is resumed by imaging with high spatial resolution.

(Step 63)
The measurement control unit 8b resumes imaging with high spatial resolution.

  According to this embodiment, when the imaging is stopped, the step and means for recording the cancellation status are provided, and the restart protocol is automatically displayed according to the cancellation status. There is an advantage that can be reduced. However, in addition to displaying the protocol in steps 58, 60, and 62, it may be provided with means for allowing the operator to approve the displayed protocol, and with means for making subtle changes to the displayed protocol as appropriate. It goes without saying that it is also good.

Next, Embodiment 4 of the present invention will be described with reference to FIGS.
Example 4 is an example in which a TOF imaging method, which is an imaging method for contrasting blood vessels, is included in one of a plurality of imaging methods. In the example shown in FIG. 16, T1-weighted imaging, TOF imaging, T2-weighted imaging, and FLAIR imaging are sequentially captured. Here, it is assumed that body motion occurs and is interrupted in T1-weighted imaging using contrast MRI. In that case, since TOF imaging cannot be performed for a while, the order multiplication is switched by the method shown in step 51 of Example 2 so that TOF imaging is the last. FIG. 17 shows the result of rearranging the order. In the present embodiment, there is an advantage that an appropriate imaging order can be determined depending on whether or not body movement has occurred.

  The present invention can be used in a magnetic resonance imaging apparatus.

  48a Main part, 48b Option part, 49 cursor, 50 Menu bar

Claims (7)

A static magnetic field generating means for generating a uniform static magnetic field in a space in which the subject is accommodated, a gradient magnetic field generating means for generating a gradient magnetic field superimposed on the static magnetic field, and a high frequency for generating a high-frequency magnetic field for irradiating the subject Magnetic field generation means, detection means for detecting NMR signals generated from the subject, imaging means for imaging the detected signals, gradient magnetic field generation means, high frequency magnetic field generation means, and detection means And a magnetic resonance imaging apparatus comprising a control unit for controlling the imaging means,
The control unit includes a planning unit that plans a plurality of imaging, and the planning unit resets a plan for restarting imaging even after any of the plurality of imagings is stopped during execution. A magnetic resonance imaging apparatus comprising a setting unit.   The magnetic resonance imaging apparatus according to claim 1, wherein the planning unit plans the order of execution of the plurality of imaging, and the resetting unit includes a replacement unit that switches the order of execution.   The magnetic resonance imaging apparatus according to claim 1, wherein the resetting unit includes an addition unit that adds an additional imaging plan in addition to the imaging planned by the planning unit.   The magnetic resonance imaging apparatus according to claim 1, wherein the resetting unit includes a first determination unit that determines whether to capture an image including an image captured at the time of the cancellation.   The magnetic resonance imaging apparatus according to claim 1, wherein the resetting unit includes a second determination unit that determines whether to perform imaging including imaging planned at the time of cancellation.   2. The magnetic resonance according to claim 1, further comprising: a recording unit that records a cancellation status at the time of the cancellation, and a presentation unit that presents an optimum resumption protocol according to the cancellation status recorded in the recording unit. Imaging device.   2. The magnetic resonance imaging apparatus according to claim 1, wherein a button for restarting the imaging includes a main part and an option part, and a restart protocol can be selected by using the option part.

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