JP2021040757A - Medical image diagnostic apparatus and heart rate measurement device - Google Patents

Abstract

To provide a medical image diagnostic apparatus that can measure a heart rate of a subject highly accurately in a non-contact manner, and to provide a heart rate measurement device.SOLUTION: A medical image diagnostic apparatus includes a measurement device 30 and a mechanism part. The measurement device images a subject placed on a top board 10a and outputs heart rate information relating to the heart rate. The mechanism part changes a measurement position of the measurement device so as to change a relative position of the measurement device to the top board.SELECTED DRAWING: Figure 2

Description

Embodiments of the present invention relate to a medical diagnostic imaging device and a heart rate measuring device.

Conventionally, medical image diagnostic devices such as magnetic resonance imaging (MRI) devices capture medical images according to the cardiac time phase based on the sensor output of an electrocardiograph or the like attached to the body of the subject. I have something to do.

Further, in recent years, attempts have been made to detect a heartbeat in a non-contact manner without attaching a sensor to the subject. For example, a technique for measuring a heartbeat from an image of a subject taken by a camera has been proposed. However, since a single camera having a fixed position and a fixed field of view cannot correspond to the posture of the subject, it may not be possible to measure the heartbeat depending on the posture of the subject at the time of imaging.

Japanese Unexamined Patent Publication No. 2019-13654

An object to be solved by the present invention is to provide a medical image diagnostic apparatus and a heartbeat measuring apparatus capable of measuring the heartbeat of a subject in a non-contact manner and with high accuracy.

The medical image diagnostic device according to the embodiment includes a measuring device and a mechanical unit. The measuring device photographs the subject placed on the top plate and outputs heartbeat information related to the heartbeat. The mechanism unit changes the measurement position of the measuring device so that the position of the measuring device relative to the top plate changes.

FIG. 1 is a perspective view showing an example of an external configuration of the magnetic resonance imaging apparatus according to the first embodiment. FIG. 2 is a diagram showing a state inside the bore as seen from the front side of the gantry according to the first embodiment. FIG. 3 is a diagram showing a state inside the bore as viewed from the AA cross section of FIG. 2 in the −X axis direction side. FIG. 4 is a diagram for explaining an example of a mounting structure of the measuring device and the support arm according to the first embodiment. FIG. 5 is a diagram showing an example of the configuration of the magnetic resonance imaging apparatus according to the first embodiment. FIG. 6 is a diagram for explaining the relationship between the heartbeat signal and the threshold value according to the first embodiment. FIG. 7 is a flowchart showing an example of MR imaging processing executed by the processing circuit of the first embodiment. FIG. 8 is a diagram for explaining a mounting position of the measuring device according to the first modification of the first embodiment. FIG. 9 is a diagram for explaining the relationship between the heartbeat signal and the threshold value according to the third modification of the first embodiment. FIG. 10 is a perspective view showing an example of the mobile screen device according to the modified example 4 of the first embodiment. FIG. 11 is a front view of the mobile screen device shown in FIG. FIG. 12 is a side view of the mobile screen device shown in FIG. FIG. 13 is a perspective view showing a state in which the mobile screen device and the top plate according to the fourth modification of the first embodiment are connected. FIG. 14 is a diagram showing a state inside the bore as seen from the front side of the gantry according to the second embodiment. FIG. 15 is a diagram showing a state inside the bore 20a as viewed from the AA cross section of FIG. 14 on the −X axis direction side. FIG. 16 is a flowchart showing an example of MR imaging processing executed by the processing circuit of the second embodiment. FIG. 17 is a diagram for explaining a mounting position of the measuring device according to the first modification of the second embodiment. FIG. 18 is a diagram showing a state inside the bore as seen from the front side of the gantry according to the second modification of the second embodiment. FIG. 19 is a diagram showing a state inside the bore as viewed from the AA cross section of FIG. 18 on the −X axis direction side.

Hereinafter, embodiments of the medical diagnostic imaging apparatus and the imaging apparatus according to the embodiment will be described with reference to the drawings. In the embodiment described below, an example applied to a magnetic resonance imaging (MRI) device will be described as an example of a medical image diagnostic device.

[First Embodiment]
FIG. 1 is a perspective view showing an example of an external configuration of the magnetic resonance imaging apparatus according to the first embodiment. The magnetic resonance imaging device 1 shown in FIG. 1 is an example of a medical image diagnostic device. As shown in FIG. 1, the magnetic resonance imaging device 1 has a sleeper 10 and a pedestal 20.

The sleeper 10 is installed outside the gantry 20. The sleeper 10 includes a top plate 10a on which the subject P is placed, and a base portion 10b that supports the top plate 10a from below.

The base portion 10b can move the top plate 10a in the vertical direction. Further, the base portion 10b moves the top plate 10a in the horizontal direction in order to feed the top plate 10a into the bore 20a provided on the gantry 20 and to take out the top plate 10a out of the bore 20a. Can be done.

The gantry 20 has a hollow bore 20a formed in a substantially cylindrical shape (including an elliptical cross section orthogonal to the central axis), and includes a static magnetic field magnet 21 and a gradient magnetic field coil 22, which will be described later, and a transmission. It houses the coil 23 and the like. Here, the space inside the bore 20a is an imaging space in which the subject P is imaged.

The X-axis, Y-axis, and Z-axis mean the device coordinate system unique to the magnetic resonance imaging device 1. For example, the Z axis is set along the magnetic flux of the static magnetic field generated by the static magnetic field magnet 21. Further, the X-axis is set along the horizontal direction orthogonal to the Z-axis, and the Y-axis is set along the vertical direction orthogonal to the Z-axis.

Further, the gantry 20 is provided with a measuring device 30 and a lighting device 50 for measuring the heartbeat of the subject P. Hereinafter, the measuring device 30 and the lighting device 50 will be described.

2 and 3 are diagrams for explaining the measuring device 30 and the lighting device 50 provided on the gantry 20. Here, FIG. 2 is a diagram showing a state inside the bore 20a as seen from the bed 10 side (front side) of the gantry 20. Further, FIG. 3 is a diagram showing a state inside the bore 20a as viewed from the AA cross section of FIG. 2 in the −X axis direction side. In the following, the side on which the bed 10 of the bore 20a is installed is also referred to as a "front side", and the opposite side is also referred to as a "rear side".

The measuring device 30 is provided on the gantry 20 at a position where the subject P placed on the top plate 10a can be measured (photographed). For example, the measuring device 30 is provided in the bore 20a of the gantry 20 or on the end surface of the gantry 20 near the opening of the bore 20a.

2 and 3 show an example in which the measuring device 30 is provided in the bore 20a of the gantry 20. Specifically, the measuring device 30 is supported by a support arm 40 provided in the bore 20a.

The measuring device 30 has a photographing unit 31 such as a color camera or an infrared camera. The measuring device 30 photographs the subject P placed on the top plate 10a, and outputs information related to the heartbeat (hereinafter, referred to as heartbeat information) from the image (video) of the subject P obtained by the imaging. That is, the measuring device 30 acquires the heartbeat information from the subject P without contacting the subject P.

Here, the heartbeat information may be the image itself obtained by photographing, or may be a heartbeat signal representing the heartbeat extracted from the image. In the latter case, a known technique can be used regardless of the signal extraction method. For example, the measuring device 30 may extract a heartbeat signal by image-analyzing the reflected light on the skin surface accompanying the contraction / expansion of blood vessels. The measuring device 30 is configured so as not to affect the magnetic field or to be less affected by the magnetic field. For example, the measuring device 30 is configured by using a non-magnetic material that does not act on a magnetic field.

The support arm 40 is an example of a mechanical unit. The support arm 40 has, for example, a curved shape corresponding to the shape of the bore 20a. Here, on the inner wall (inner circumference) 40a side of the support arm 40, a first moving mechanism 41 such as a groove or a rail is provided along the circumferential direction of the support arm 40. By being attached to the first moving mechanism 41, the measuring device 30 can move in the circumferential direction of the support arm 40, that is, around the long axis of the top plate 10a (in the direction of arrow A1).

The configuration of the first moving mechanism 41 and the attachment structure of the measuring device 30 to the first moving mechanism 41 are not particularly limited, and various forms can be adopted. For example, when the first moving mechanism 41 is composed of a groove, a rail, or the like, the measuring device 30 may be attached to the first moving mechanism 41 in the structure shown in FIG. Further, the support arm 40 is configured so as not to affect the magnetic field or to be less affected by the magnetic field. For example, the support arm 40 is constructed by using a non-magnetic material such as a resin that does not act on a magnetic field.

FIG. 4 is a diagram for explaining an example of a mounting structure of the measuring device 30 and the support arm 40. As shown in FIG. 4, on the inner wall 40a side of the support arm 40, as a first moving mechanism 41, a groove portion 41a having a substantially T-shaped cross section is provided over the circumferential direction of the support arm 40.

On the other hand, the measuring device 30 has a substantially T-shaped engaging portion 32 corresponding to the cross-sectional shape of the first moving mechanism 41 in a part of the housing. The measuring device 30 is attached so that the engaging portion 32 engages with the groove portion 41a of the first moving mechanism 41. Here, a predetermined gap is provided between the engaging portion 32 and the groove portion 41a, and the engaging portion 32 can move along the groove portion 41a. In addition, in order to improve the slidability of the measuring device 30, for example, a wheel or a low friction engaging material may be provided at the contact portion between the engaging portion 32 and the groove portion 41a.

The first moving mechanism 41 is not limited to the configuration shown in FIG. For example, the first moving mechanism 41 may include a driving device such as a transport belt or a motor capable of moving the measuring device 30 along the groove 41a. In this embodiment, a mode in which the measuring device 30 is manually moved on the groove 41a will be described.

Returning to FIGS. 2 and 3, the support arm 40 is movable in the Z-axis direction in the bore 20a of the gantry 20. Specifically, the support arm 40 is attached to a second moving mechanism 42 provided on the inner wall of the bore 20a to guide the movement in the Z-axis direction, so that the support arm 40 is attached in the Z-axis direction, that is, the long axis of the top plate 10a. It is possible to move along the direction (A2 direction in the figure).

2 and 3 show an example in which a pair of left and right rails 42a are provided as an example of the second moving mechanism 42. Here, the rail 42a is provided at a position that does not hinder the movement of the top plate 10a into the bore 20a, and extends from the front side to the rear side of the gantry 20. Further, wheels or the like may be provided on the base of the support arm 40 facing the rail 42a in order to improve slidability.

The form of the second moving mechanism 42 is not limited to the above-mentioned example, and may be realized by other forms. For example, the second moving mechanism 42 has a groove portion similar to that of the first moving mechanism 41 instead of the rail 42a, and by engaging the groove portion with the engaging portions provided at both ends of the support arm 40. , The support arm 40 may be moved in the Z-axis direction. Further, for example, the second moving mechanism 42 may include a driving device such as a transport belt or a motor capable of moving the support arm 40 along the rail 42a. In this embodiment, a mode in which the support arm 40 is manually moved on the rail 42a will be described.

With the above-described configuration, the support arm 40 can change the measurement position of the measuring device 30 so that the relative position of the measuring device 30 with respect to the top plate 10a changes. Specifically, by changing the position of the measuring device 30 in the first moving mechanism 41 (groove portion 41a) and the position of the support arm 40 in the second moving mechanism 42 (rail 42a), the top plate The position around the long axis of 10a and the position in the long axis direction can be individually changed.

Further, the gantry 20 is provided with a lighting device 50. The lighting device 50 is provided on the gantry 20 at a position where the subject P placed on the top plate 10a can be illuminated. For example, the lighting device 50 is provided in the bore 20a of the gantry 20 or on the end surface of the gantry 20 near the opening communicating with the bore 20a.

2 and 3 show an example in which the measuring device 30 is provided in the bore 20a. In such a configuration, an example in which the lighting device 50 is attached to the inner wall of the bore 20a is shown.

The lighting device 50 illuminates the subject P placed on the top plate 10a. More specifically, the lighting device 50 illuminates the subject P to provide the brightness required for the measurement (photographing) of the subject P by the measuring device 30.

Note that FIGS. 2 and 3 show an example in which the lighting devices 50 are provided at symmetrical positions on the rear side of the inner wall of the bore 20a, but the positions and the number of the lighting devices 50 are limited to this. It shall not be done. For example, by integrating the measuring device 30 and the lighting device 50, the structure may be movable by the support arm 40 described above. With such a configuration, the range to be photographed by the measuring device 30 can be pinpointed by the lighting device 50, so that the subject P can be efficiently illuminated.

Further, the lighting device 50 is configured so as not to affect the magnetic field or to be easily affected by the magnetic field. For example, the lighting device 50 is constructed by using a non-magnetic material that does not act on a magnetic field.

Next, the configuration of the magnetic resonance imaging device 1 will be described with reference to FIG. FIG. 5 is a diagram showing an example of the configuration of the magnetic resonance imaging device 1.

As shown in FIG. 5, in addition to the above-mentioned sleeper 10 and pedestal 20, the magnetic resonance imaging device 1 includes a gradient magnetic field power supply 2, a transmission circuit 3, a reception circuit 4, an interface circuit 5, an input interface 6, a display 7, and a storage circuit. 8 and processing circuits 61 to 64 and the like are provided.

The gantry 20 includes the above-mentioned measuring device 30, the support arm 40, and the lighting device 50 in the bore 20a. Further, the gantry 20 accommodates a static magnetic field magnet 21, a gradient magnetic field coil 22, a transmitting coil 23, a receiving coil 24, and the like.

The static magnetic field magnet 21 generates a static magnetic field in the bore 20a in which the subject P is arranged. Specifically, the static magnetic field magnet 21 is formed in a hollow substantially cylindrical shape (including one having an elliptical cross section orthogonal to the central axis of the cylinder) so as to surround the bore 20a, and is inside the cylinder. Generates a static magnetic field in the space of. For example, the static magnetic field magnet 21 may be a superconducting magnet or a permanent magnet.

The gradient magnetic field coil 22 is arranged inside the static magnetic field magnet 21, and applies a gradient magnetic field to the bore 20a in which the subject P is arranged. Specifically, the gradient magnetic field coil 22 generates a gradient magnetic field along each of the X-axis, Y-axis, and Z-axis.

The transmission coil 23 is arranged inside the gradient magnetic field coil 22, and is RF in the bore 20a (imaging space) in which the subject P is arranged based on the RF (Radio Frequency) pulse input from the transmission circuit 3. Apply a magnetic field.

The receiving coil 24 receives an NMR (Nuclear Magnetic Resonance) signal generated from the subject P due to the influence of the RF magnetic field applied by the transmitting coil 23, and receives it as an MR (Magnetic resonance) signal. Output to circuit 4.

The static magnetic field magnet 21, the gradient magnetic field coil 22, the transmitting coil 23 and the receiving coil 24 provided in the gantry 20 are examples of an imaging unit related to the acquisition of a medical image of the subject P.

In FIG. 5, the receiving coil 24 is provided separately from the transmitting coil 23, but this is an example and is not limited to the configuration. For example, a configuration in which the receiving coil 24 is also used as the transmitting coil 23 may be adopted. Further, the receiving coil 24 is not limited to the receiving coil for the whole body provided in the gantry, and may be a local coil according to the imaging target portion. The local coil includes, for example, a coil for imaging the spine, a coil for imaging the head, and the like. When there are a plurality of imaging target sites, a plurality of local coils may be installed as the receiving coil 24.

The gradient magnetic field power supply 2 supplies a current to the gradient magnetic field coil 22 to generate a gradient magnetic field along the X-axis, Y-axis, and Z-axis in the space inside the gradient magnetic field coil 22.

The transmission circuit 3 supplies the transmission coil 23 with an RF pulse corresponding to the Larmor frequency determined by the type of the target nucleus and the strength of the magnetic field.

The receiving circuit 4 generates MR data based on the MR signal output from the receiving coil 24, and outputs the generated MR data to the processing circuit 62. For example, the receiving circuit 4 includes a selection circuit, a pre-stage amplifier circuit, a phase detection circuit, and an analog-to-digital conversion circuit. The selection circuit selectively inputs the MR signal output from the receiving coil 24. The pre-stage amplifier circuit amplifies the MR signal output from the selection circuit. The phase detection circuit detects the phase of the MR signal output from the pre-stage amplifier circuit. The analog-to-digital conversion circuit generates MR data by converting the analog signal output from the phase detection circuit into a digital signal, and outputs the generated MR data to the processing circuit 62. The receiving coil 24 may have a part of the functions of the receiving circuit 4 described above, so that the MR signal converted into a digital signal may be output to the processing circuit 62 as MR data.

The interface circuit 5 is connected to each of the measuring device 30, the support arm 40, and the lighting device 50, and relays communication between each of these devices and the processing circuit 64. For example, the interface circuit 5 outputs the heartbeat information input from the measuring device 30 to the processing circuit 64. For example, the interface circuit 5 transfers the control information related to the drive control of the first moving mechanism 41 and the second moving mechanism 42 input from the measuring device 30 to the first moving mechanism 41 and the second moving mechanism 41 of the support arm 40. Output to the mechanism 42. For example, the interface circuit 5 outputs the control information related to the illuminance control of the lighting device 50 input from the measuring device 30 to the lighting device 50.

The input interface 6 receives various instructions and various information input operations from the operator. Specifically, the input interface 6 is connected to each processing circuit, converts the input operation received from the operator into an electric signal, and outputs the input operation to the control circuit. For example, the input interface 6 includes a trackball, a switch button, a mouse, a keyboard, a touch pad for performing input operations by touching an operation surface, a touch screen in which a display screen and a touch pad are integrated, and a non-optical sensor. It is realized by a contact input interface, a voice input interface, and the like. The input interface 6 is not limited to the one provided with physical operating parts such as a mouse and a keyboard. For example, an example of the input interface 6 includes an electric signal processing circuit that receives an electric signal corresponding to an input operation from an external input device provided separately from the device and outputs the electric signal to a control circuit.

The display 7 displays various information and various images. Specifically, the display 7 is connected to each processing circuit, and converts various information and various image data sent from the processing circuit into an electric signal for display and outputs the data. For example, the display 7 is realized by a liquid crystal monitor, a CRT (Cathode Ray Tube) monitor, a touch panel, or the like.

The storage circuit 8 stores various data. Specifically, the storage circuit 8 stores MR data and image data. For example, the storage circuit 8 is realized by a semiconductor memory element such as a RAM (Random Access Memory) or a flash memory, a hard disk, an optical disk, or the like.

The processing circuit 61 has a sleeper control function 61a. The sleeper control function 61a controls the operation of the sleeper 10 by outputting an electric signal for control to the sleeper 10. For example, the sleeper control function 61a receives an instruction from the operator to move the top plate 10a in the longitudinal direction, the vertical direction, or the horizontal direction via the input interface 6, and moves the top plate 10a according to the received instruction. The moving mechanism of the top plate 10a included in the sleeper 10 is operated.

The processing circuit 62 has an execution function 62a. The execution function 62a executes various pulse sequences by driving the gradient magnetic field power supply 2, the transmission circuit 3, and the reception circuit 4 based on the sequence execution data output from the processing circuit 64. For example, the executive function 62a drives the gradient magnetic field power supply 2, the transmission circuit 3, and the reception circuit 4 by transmitting input signals to the gradient magnetic field power supply 2, the transmission circuit 3, and the reception circuit 4, respectively.

Here, the sequence execution data is information that defines a pulse sequence indicating a procedure for collecting MR data. Specifically, the sequence execution data includes the timing at which the gradient magnetic field power supply 2 supplies the current to the gradient magnetic field coil 22, the strength of the supplied current, the strength of the RF pulse signal supplied by the transmission circuit 3 to the transmission coil 23, and the strength of the RF pulse signal. This is information that defines the supply timing, the detection timing at which the receiving circuit 4 detects the MR signal, and the like.

Then, the execution function 62a receives MR data from the receiving circuit 4 as a result of executing various pulse sequences, and stores the received MR data in the storage circuit 8. The set of MR data received by the execution function 62a is arranged according to the phase encoding amount given by the gradient magnetic field and the frequency encoding amount at the time of reading, so that the storage circuit 8 can be used as data constituting the k-space. Is remembered in.

The processing circuit 63 has an image generation function 63a. The image generation function 63a generates an image based on the MR data stored in the storage circuit 8. Specifically, the image generation function 63a reads the k-space data stored in the storage circuit 8 by the execution function 62a, and generates an image by performing reconstruction processing such as Fourier transform on the read k-space data. Further, the image generation function 63a stores the image data of the generated image in the storage circuit 8. In this specification, a series of processes related to image data generation performed by the processing circuit 62 (execution function 62a) and the processing circuit 63 (image generation function 63a) are referred to as "imaging" or "MR imaging".

The processing circuit 64 has a measurement control function 64a, a heartbeat detection function 64b, a dimming function 64c, and an imaging function 64d.

The measurement control function 64a is an example of the measurement control unit. The measurement control function 64a controls the operation of the measurement device 30 and the lighting device 50 by outputting various control signals to the measurement device 30, the support arm 40, and the lighting device 50 via the interface circuit 5. Specifically, the measurement control function 64a starts the heartbeat measurement of the subject P placed on the top plate 10a by driving the measurement device 30 and the lighting device 50.

The heartbeat detection function 64b detects the heartbeat of the subject P placed on the top plate 10a based on the heartbeat information measured by the measuring device 30. Specifically, the measurement control function 64a analyzes the heartbeat information (image) input from the measuring device 30 via the input interface 6 and extracts the heartbeat signal representing the heartbeat of the subject P. Then, the heartbeat detection function 64b detects the cardiac time phase of the subject P based on the extracted heartbeat signal.

In the case where the heartbeat signal is output from the measuring device 30, the heartbeat detection function 64b detects the cardiac time phase of the subject P based on the heartbeat signal input from the measuring device 30.

The dimming function 64c is an example of an adjusting unit. The dimming function 64c controls the operation of the lighting device 50. Specifically, the dimming function 64c cooperates with the heartbeat detection function 64b to adjust the illuminance of the lighting device 50 according to the heartbeat information or the state of the heartbeat signal.

For example, in the dimming function 64c, as shown in FIG. 6A, it is assumed that the signal level of the heartbeat signal PL detected by the heartbeat detection function 64b is less than a predetermined threshold value TH. Here, FIG. 6 is a diagram for explaining the relationship between the heartbeat signal PL and the threshold value TH. The threshold value TH is an index value for the heartbeat detection function 64b to identify each cardiac time phase from the heartbeat signal PL. Further, the signal level of the heartbeat signal PL means a maximum value of the heartbeat signal PL, a signal value for clearly identifying a specific cardiac time phase, and the like.

By the way, since the signal level of the heartbeat signal detected by the heartbeat detection function 64b is derived from the image measured (photographed) by the measuring device 30, it is affected by the ambient light. Therefore, for example, when the brightness of the photographing range of the measuring device 30 does not meet the predetermined reference, the signal level of the heartbeat signal PL may not reach the threshold value TH as shown in FIG. 6A.

Therefore, when the signal level of the heartbeat signal PL is less than the threshold value TH, the dimming function 64c provides the illuminance of the lighting device 50 until the signal level of the heartbeat signal PL becomes equal to or higher than the threshold value TH, as shown in FIG. 6B. To raise. In this way, the signal level of the heartbeat signal can be increased by increasing the illuminance of the lighting device 50. As a result, the heartbeat detection function 64b can detect the heartbeat (heart-temporal phase, etc.) of the subject P from the measurement information acquired by the measuring device 30.

The dimming function 64c may be controlled not only to increase the illuminance of the lighting device 50 but also to decrease it. For example, when the minimum value of the signal level of the heartbeat signal PL exceeds the threshold value TH, the dimming function 64c may reduce the illuminance of the lighting device 50 until it becomes possible to specify each cardiac time phase. ..

The imaging function 64d controls MR imaging. For example, the imaging function 64d receives input of imaging conditions from the operator via the input interface 6. Then, the imaging function 64d generates sequence execution data based on the received imaging conditions, and transmits the sequence execution data to the processing circuit 62 to execute various pulse sequences.

Further, for example, the measurement control function 64a performs MR imaging in synchronization with the heartbeat signal detected by the heartbeat detection function 64b in response to a request from the operator. Specifically, the measurement control function 64a performs MR imaging at the timing of a specific cardiac phase such as diastole or systole.

For example, each of the above-mentioned processing circuits is realized by a processor. In that case, for example, the processing function of each processing circuit is stored in the storage circuit 8 in the form of a program that can be executed by a computer. Each processing circuit realizes a function corresponding to each program by reading each program from the storage circuit 8 and executing the program. In other words, each processing circuit in the state where each program is read has each function shown in each processing circuit of FIG.

Further, each processing circuit may be configured by combining a plurality of independent processors, and each processor may realize each function by executing a program. Further, the functions of each processing circuit may be realized by being appropriately distributed or integrated into a single processing circuit or a plurality of processing circuits. Further, the function of each processing circuit may be realized by mixing hardware such as a circuit and software.

Further, the word "processor" used in the above description means, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an integrated circuit for a specific application (Application Specific Integrated Circuit: ASIC), or a programmable logic device. (For example, it means a circuit such as a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA)). The processor realizes the function by reading and executing the program stored in the storage circuit 8. Instead of storing the program in the storage circuit 8, the program may be directly incorporated in the circuit of the processor. In this case, the processor realizes the function by reading and executing the program embedded in the circuit. Further, the processor of the present embodiment is not limited to the case where it is configured as a single circuit, and a plurality of independent circuits may be combined to be configured as one processor to realize its function.

Here, the program executed by the processor is provided by being incorporated in a ROM (Read Only Memory), a storage circuit, or the like in advance. This program is a file in a format that can be installed or executed on these devices, such as CD (Compact Disk) -ROM, FD (Flexible Disk), CD-R (Recordable), DVD (Digital Versatile Disk), etc. It may be recorded and provided on a computer-readable storage medium. Further, this program may be provided or distributed by being stored on a computer connected to a network such as the Internet and downloaded via the network. For example, this program is composed of modules including each of the above-mentioned functional parts. In actual hardware, the CPU reads a program from a storage medium such as a ROM and executes it, so that each module is loaded on the main storage device and generated on the main storage device.

Next, an operation example of the magnetic resonance imaging apparatus 1 of the present embodiment will be described with reference to FIG. 7. FIG. 7 is a flowchart showing an example of the operation of the magnetic resonance imaging device 1 of the present embodiment.

First, a medical worker such as an operator of the magnetic resonance imaging device 1 manually operates the first moving mechanism 41 and the second moving mechanism 42 to measure the measurement position according to the posture of the subject P. The device 30 is moved (step S11). The measurement position means the position of the measuring device 30 when measuring the heartbeat of the subject P placed on the top plate 10a.

In step S11, the medical worker positions the measuring device 30 at a measuring position where the face and neck of the subject P can be photographed, for example. Since the face and neck are areas where the skin is highly exposed, it is easy for the measuring device 30 to obtain images and videos necessary for acquiring heartbeat information.

After the measurement device 30 is moved, the measurement control function 64a operates the measurement device 30 and the lighting device 50 in response to an operation or the like via the input interface 6, and starts the heartbeat measurement of the subject P. Subsequently, the dimming function 64c determines whether or not the signal level of the heartbeat signal detected by the heartbeat detection function 64b is equal to or higher than the threshold value (step S12). Here, when the signal level of the heartbeat signal is less than the threshold value (step S12; No), the dimming function 64c raises the illuminance of the lighting device 50 by a predetermined amount (step S13), and returns to step S12. For example, when the minimum value of the signal level exceeds the threshold value, the dimming function 64c may reduce the illuminance of the lighting device 50 by a predetermined amount in step S13.

On the other hand, when the signal level of the heartbeat signal is equal to or higher than the threshold value (step S12; Yes), the process proceeds to step S14. Subsequently, the image pickup function 64d MR-images the subject P at a predetermined cardiac time phase timing based on the heartbeat signal detected by the heartbeat detection function 64b (step S14). The heartbeat signal may be simply acquired (recorded). For example, when MR imaging is performed using the retrospective gating method, MR data can be reconstructed based on the previously acquired heartbeat signal (cardiac time phase information).

As described above, the magnetic resonance imaging device 1 of the present embodiment takes a picture of the subject P placed on the top plate 10a and outputs the heartbeat information related to the heartbeat, and the measurement on the top plate 10a. A support arm 40 (first moving mechanism 41, second moving mechanism 42) that changes the measuring position of the measuring device 30 is provided so that the relative position of the device 30 changes. Then, in the magnetic resonance imaging device 1, by manually operating the first moving mechanism 41 and the second moving mechanism 42, the position of the top plate 10a, the posture of the subject P placed on the top plate 10a, and the like can be adjusted. The measuring device 30 can be moved accordingly.

As a result, the magnetic resonance imaging device 1 can position the measuring device 30 at a measurement position according to the position of the top plate 10a and the posture of the subject P, so that the heartbeat measurement of the subject P can be performed under suitable conditions. Can be done. Therefore, the magnetic resonance imaging device 1 can measure the heartbeat of the subject P in a non-contact manner and with high accuracy.

Further, the magnetic resonance imaging device 1 adjusts the illuminance of the lighting device 50 according to the state of the heartbeat information (heartbeat signal) output by the measuring device 30. As a result, the magnetic resonance imaging device 1 can secure the illuminance required for the measurement of the heartbeat, so that the measurement accuracy can be improved.

The above-described embodiment can be appropriately modified and implemented by changing a part of the configuration or function of the magnetic resonance imaging device 1. Therefore, in the following, some modifications according to the above-described embodiment will be described as other embodiments. In the following, points different from the above-described embodiment will be mainly described, and detailed description of points common to the contents already described will be omitted. Further, the modifications described below may be carried out individually or in combination as appropriate.

(Modification example 1)
In the above-described embodiment, the measuring device 30 is configured to be movable both around the major axis and in the longitudinal direction of the top plate 10a, but it may be configured to be movable in only one of them.

For example, the measuring device 30 may be movable only around the long axis of the top plate 10a. In this case, the measuring device 30 may be directly attached to the first moving mechanism 41 (groove portion 41a) provided on the inner wall of the bore 20a or the end surface of the gantry 20 without using the support arm 40 described above. Further, when this configuration is adopted, it is preferable that the first moving mechanism 41 is provided at a position such as the rear side of the opening of the bore 20a where the subject P can be efficiently photographed.

FIG. 8 is a diagram for explaining the mounting position of the measuring device 30 according to the present modification. Here, FIG. 8 is a view of the gantry 20 as viewed from the rear side.

As shown in FIG. 8, the measuring device 30 is provided on the end surface 20b of the gantry 20. Specifically, the measuring device 30 is attached in a state of being engaged with the first moving mechanism 41 (groove portion 41a) provided on the end surface 20b of the gantry 20. Here, the end surface 20b corresponds to the wall surface of the gantry 20 near the opening of the bore 20a, or the connecting surface connecting the wall surface of the gantry 20 and the bore 20a.

The first moving mechanism 41 has a curved shape corresponding to the opening shape of the bore 20a. By attaching the measuring device 30 to the first moving mechanism 41, it is possible to move the measuring device 30 around the long axis of the top plate 10a (in the A1 direction in the drawing).

Further, a lighting device 50 is provided on the end surface 20b of the gantry 20. FIG. 8 shows an example in which a pair of lighting devices 50 are provided so as to face each other with the bore 20a interposed therebetween. The lighting device 50 illuminates the photographing range of the measuring device 30 by illuminating the top plate 10a.

As a result, the magnetic resonance imaging device 1 according to the present modification can position the measuring device 30 at a measurement position according to the position of the top plate 10a and the posture of the subject P, as in the above-described embodiment. The heart rate measurement of the subject P can be performed under suitable conditions. Therefore, the magnetic resonance imaging device 1 can measure the heartbeat of the subject P in a non-contact manner and with high accuracy.

If the lighting device 50 can illuminate the photographing range of the measuring device 30, the installation position and the number thereof are not limited to the example of FIG. For example, the lighting device 50 may be configured to be movable together with the measuring device 30 by being integrally configured with the measuring device 30.

Further, FIG. 8 shows an example in which the measuring device 30 and the lighting device 50 are provided on the rear end surface 20b of the gantry 20, but the present invention is not limited to this, and the measuring device 30 and the lighting are provided on the front end surface 20b of the gantry 20. The device 50 may be provided.

(Modification 2)
In the above-described embodiment, the embodiment in which the measuring device 30 is manually moved has been described. In this modification, a mode in which the measuring device 30 is automatically moved will be described.

Hereinafter, the configuration of the magnetic resonance imaging apparatus 1 described with reference to FIGS. 2 and 3 will be described as an example. As a premise of this modification, the first moving mechanism 41 is provided with a driving device such as a conveyor belt or a motor capable of moving the measuring device 30 along the groove 41a. Further, the second moving mechanism 42 is provided with a driving device such as a transport belt or a motor capable of moving the support arm 40 along the rail 42a. Further, the first moving mechanism 41 and the second moving mechanism 42 are configured to be driven under the control of the measurement control function 64a.

The measurement control function 64a has a function for adjusting the position of the measuring device 30 with respect to the top plate 10a in addition to the functions described in the above-described embodiment. Specifically, the measurement control function 64a outputs a drive signal to the first moving mechanism 41 and the second moving mechanism 42 via the interface circuit 5, so that the subject P placed on the top plate 10a The position (measurement position) of the measuring device 30 when measuring the heartbeat of the user is controlled.

For example, in the measurement control function 64a, when position information indicating the position of the top plate 10a in the bore 20a is input via the input interface 6, the measurement device 30 (support arm 40) is placed at the measurement position according to the position information. ) Is moved.

Further, for example, when information indicating the posture of the subject P placed on the top plate 10a is input via the input interface 6, the measurement control function 64a is set to the measurement position according to the posture of the subject P. The measuring device 30 is moved. The measurement control function 64a selectively selects, for example, which of the right lateral decubitus position, the left lateral decubitus position, the supine position, and the prone position, and which of the head and the foot is first sent to the bore 20a. When input to, the posture of the subject P is derived based on this information. Further, when the imaging method and sequence information associated with the posture of the subject P at the time of MR imaging include information on the posture of the subject P, the posture of the subject P is derived from the imaging method and the sequence information. You may.

Here, the measurement control function 64a sets, for example, a position where the face and neck of the subject P can be photographed as the measurement position. As described above, since the face and neck are areas where the skin is often exposed, the measuring device 30 can easily obtain an image or a video necessary for acquiring heartbeat information. For example, the measurement control function 64a specifies the measurement position in the long axis direction of the top plate 10a based on the position in the Z-axis direction determined from the position information of the top plate 10a, and measures the measuring device 30 by the second moving mechanism 42. Move to position. Further, the measurement control function 64a specifies the measurement position around the long axis of the top plate 10a, and moves the measurement device 30 to the measurement position by the first movement mechanism 41. The measurement control function 64a positions the measuring device 30 at a position facing the face and neck of the subject P by detecting a characteristic portion of the face of the subject P from the image captured by the measuring device 30. May be good. The facial features are organs such as the eyes, nose, and mouth.

In this way, the measurement control function 64a specifies a measurement position where the face, neck, etc. of the subject P can be photographed according to the position of the top plate 10a, the posture of the subject P, and the like, and measures at the measurement position. Move the device 30. As a result, the measuring device 30 can perform measurement at a measurement position suitable for acquiring heartbeat information, so that the measurement accuracy can be improved.

In the above example, the measurement control function 64a specifies the measurement position, but the present invention is not limited to this, and the measurement position may be directly instructed by the operator. Specifically, when the measurement position is instructed via the input interface 6, the measurement control function 64a drives the first movement mechanism 41 and the second movement mechanism 42 to reach the instructed measurement position. The measuring device 30 is moved.

When the measuring device 30 and the lighting device 50 are integrally configured, the measurement control function 64a controls the position of the measuring device 30 to control the lighting device 50 with respect to the top plate 10a (subject P). The position of can also be controlled.

As a result, the magnetic resonance imaging device 1 according to the present modification can position the measuring device 30 at a measurement position according to the position of the top plate 10a and the posture of the subject P, and thus the heartbeat measurement of the subject P is suitable. It can be done under various conditions. Therefore, the magnetic resonance imaging device 1 can measure the heartbeat of the subject P in a non-contact manner and with high accuracy.

(Modification example 3)
In the above-described embodiment, when the signal level of the heartbeat signal is less than the threshold value, the mode in which the heartbeat signal reaches the threshold value or more by increasing the illuminance of the lighting device 50 has been described. However, it is not limited to this form. Therefore, in this modified example, another coping method when the signal level of the heartbeat signal becomes less than the threshold value will be described.

First, the first coping method will be described. In the first coping method, a mode for adjusting the sensitivity (ISO sensitivity) of the measuring device 30 will be described. In this modification, the measurement control function 64a functions as an example of the adjusting unit.

The measurement control function 64a of this modification cooperates with the heartbeat detection function 64b to adjust the sensitivity of the measurement device 30 according to the heartbeat information or the state of the heartbeat signal.

For example, when the signal level of the heartbeat signal PL detected by the heartbeat detection function 64b is less than the threshold value TH, the sensitivity of the photographing unit 31 of the measuring device 30 is adjusted until the signal level of the heartbeat signal PL becomes equal to or higher than the threshold value TH. Raise. As a result, the amount of light received by the photographing unit 31 increases, so that the same effect as when the illuminance of the lighting device 50 is increased can be obtained.

Next, the second coping method will be described. In the second coping method, a mode for adjusting the value of the threshold value TH will be described. In this modification, the heart rate detection function 64b functions as an example of the adjusting unit.

For example, when the signal level of the heartbeat signal PL does not reach the threshold value TH, it is assumed that the signal level of the heartbeat signal does not reach the threshold value even if the illuminance of the lighting device 50 is increased to the maximum by the above method. To. Further, even if the sensitivity of the measuring device 30 is increased to the maximum, it is assumed that the signal level of the heartbeat signal does not reach the threshold value.

In such a case, the heartbeat detection function 64b lowers the threshold value TH to a position where the signal level of the heartbeat signal PL is equal to or higher than the threshold value TH, for example, as shown in FIGS. 9A and 9B. As a result, the heartbeat detection function 64b can detect the heartbeat of the subject P from the heartbeat information acquired by the measuring device 30. Note that FIG. 9 is a diagram for explaining the relationship between the heartbeat signal PL and the threshold value TH.

(Modification example 4)
In this modified example, an example in which the support arm 40 is applied to a mobile screen device for providing an image to the subject P placed on the top plate 10a will be described.

First, the configuration of the mobile screen device 70 according to this modification will be described with reference to FIGS. 10, 11, 12, and 13. Here, FIG. 10 is a perspective view showing an example of the mobile screen device 70. FIG. 11 is a front view of the mobile screen device 70 shown in FIG. FIG. 12 is a side view of the mobile screen device 70 shown in FIG. FIG. 13 is a perspective view showing a state in which the mobile screen device 70 and the top plate 10a are connected.

The mobile screen device 70 includes a mobile carriage 71, a screen 72, a support arm 73, and a reflector 74. The moving carriage 71 is a structure that moves along a rail (for example, the rail 42a in FIG. 2) provided on the inner wall of the bore 20a. Wheels and low-friction engagement members are attached to the parts of the moving carriage 71 that come into contact with the rails in order to improve the runnability of the rails. The moving carriage 71 is made of a non-magnetic material that does not act on a magnetic field.

The mobile carriage 71 is provided with a connecting portion 75 for connecting to the top plate 10a of the sleeper 10. As shown in FIG. 13, the moving carriage 71 and the top plate 10a are connected by the connecting portion 75. The subject P is placed on the top plate 10a with its head facing the side to which the moving carriage 71 is connected.

The screen 72 is erected on the moving carriage 71. An image from a projector (not shown) is projected on the screen 72. Here, the projector is arranged on the side opposite to the sleeper 10 with the screen 72 interposed therebetween. For example, the projector projects an image on the screen 72 from the rear side of the gantry 20 through the bore 20a.

The screen 72 is provided so as to be tiltable with respect to the moving carriage 71. Specifically, the screen 72 is provided so as to be tiltable by a tilting mechanism (not shown) provided on the moving carriage 71. By adjusting the tilt angle of the screen 72 with respect to the surface of the mobile carriage 71, the screen 72 is held perpendicular to the surface of the mobile carriage 71 or at a predetermined tilt angle.

The screen 72 is preferably made of a translucent material. As such a translucent material, it is preferable to use translucent plastic, frosted glass, or the like. Since the screen 72 is formed of a translucent material, the projected light from the projector 100 is applied to the back surface of the screen 72 (the surface on the projector 100 side), and the image corresponding to the projected light is displayed on the front surface (the surface on the sleeper 10 side). It is projected on.

The screen 72 may have a planar shape or a curved surface shape. When it has a curved surface shape, it is preferable to arrange it so that the concave surface faces the sleeper 10 side, that is, forms a surface. When the concave surface faces the sleeper 10 side, the screen 72 can cover the rear periphery of the head of the subject P placed on the top plate 10a. As a result, the field of view of the subject P can be filled with the image projected on the screen 72 and immersed in the image.

The support arm 73 is attached to the moving carriage 71 so as to be movable in the Z-axis direction. The support arm 73 is made of a non-magnetic material and has a curved shape along the contour of the screen 72.

Here, on the inner wall (inner circumference) 73a side of the support arm 73, a first moving mechanism 76 such as a groove or a rail is provided along the circumferential direction of the support arm 73. The measuring device 30 is attached to the first moving mechanism 76. The first moving mechanism 76 corresponds to the second moving mechanism 42 of the first embodiment described above, and moves the measuring device 30 in the circumferential direction of the support arm 73.

Further, the support arm 73 supports the reflector 74 so as to be arranged in the space on the surface side of the screen 72. The reflector 74 is separated from the surface of the moving carriage 71 so as not to hit the head of the subject P placed on the top plate 10a in a state where the moving carriage 71 and the top plate 10a are connected. It is supported by the support arm 73.

The reflector 74 is provided at substantially the uppermost portion of the support arm 73. The reflector 74 reflects the image projected on the surface of the screen 72. The reflector 74 is made of a non-magnetic material, and may be made of any material as long as the object can be optically reflected. For example, as the reflector 74, a mirror in which aluminum is vapor-deposited on acrylic, a half mirror in which a dielectric film is attached, or the like can be used. As a result, the subject P placed on the top plate 10a can see the image projected on the surface of the screen 72 through the reflector 74.

The reflector 74 is rotatably provided on the support arm 73 so that the subject P can manually adjust the angle of the reflector 74. Specifically, the reflector 74 is rotatably provided around the rotation axis R1 by a rotation mechanism 77 provided on the support arm 73. The rotation axis R1 is provided, for example, parallel to the X axis so that the orientation of the reflector 74 with respect to the surface of the screen 72 can be adjusted.

Further, in order to adjust the position of the reflector 74 with respect to the Z axis, the moving carriage 71 is provided with a second moving mechanism 78 capable of moving the support arm 73 in the Z axis direction. The second moving mechanism 78 corresponds to the second moving mechanism 42 of the first embodiment described above, and moves the support arm 73 in the Z-axis direction.

The lighting device 50 may be provided on the support arm 73 or may be provided on the inner wall of the bore 20a. When the lighting device 50 is provided on the support arm 73, the lighting device 50 may be configured to be movable together with the measuring device 30 by being integrally configured with the measuring device 30, or may be fixedly attached to the support arm 73. May be. In the latter case, the mounting position and the number of the lighting devices 50 are not particularly limited, but it is preferable to provide the lighting devices 50 at positions that do not interfere with the rotation of the reflector 74 or the movement of the measuring device 30.

As described above, the magnetic resonance imaging device 1 of the present modification can provide an image to the subject P placed on the top plate 10a via the mobile screen device 70, and the subject P can be provided with an image. The heartbeat can be measured in a non-contact manner. As a result, the magnetic resonance imaging device 1 can measure the heartbeat with high accuracy without making the subject P aware of the heartbeat measurement. In addition, the subject P can comfortably spend a relatively long time in the bore 20a even during MR imaging.

(Modification 5)
In the above-described embodiment, the tunnel-type magnetic resonance imaging apparatus 1 having the hollow bore 20a has been described as an example. However, the magnetic resonance imaging apparatus to which the application is applied is not limited to this type.

For example, a pair of static magnetic field magnets 21, a pair of gradient magnetic field coils 22, and a pair of RF coils (transmitting coil 23, receiving coil 24) are arranged so as to face each other across an imaging space in which the subject P is arranged, so-called. It may be applied to an open magnetic resonance imaging device. In this case, the imaging space sandwiched between the pair of static magnetic field magnets 21, the pair of gradient magnetic field coils 22, and the pair of RF coils corresponds to the bore 20a in the tunnel type configuration. Further, the bed 10 in the imaging space corresponds to the "front side", and vice versa corresponds to the "rear side".

By applying the configuration according to the measuring device 30 described in the above-described embodiment to the open magnetic resonance imaging device, the magnetic resonance imaging device can perform the measurement position according to the position of the top plate 10a and the posture of the subject P. The measuring device 30 can be positioned in. As a result, the magnetic resonance imaging apparatus of the present modification can measure the heartbeat of the subject P under suitable conditions, so that the heartbeat of the subject P can be measured in a non-contact manner and with high accuracy.

(Modification 6)
In the above-described embodiment, an example in which the medical diagnostic imaging apparatus is applied to the magnetic resonance imaging apparatus 1 has been described. However, the medical image diagnostic device to which the device is applied is not limited to the magnetic resonance imaging device. For example, it may be applied to a computer tomography (CT) imaging device, a positron emission tomography (PET) imaging device, or the like.

When applied to a computed tomography apparatus, the gantry corresponds to an apparatus (gantry) that executes a CT scan on the subject P placed on the bed 10. The imaging unit corresponds to an X-ray generator that irradiates the subject P with X-rays, a detector that detects the X-rays that have passed through the subject P, and the like. Further, when applied to a positron emission tomography apparatus, the gantry corresponds to an apparatus for performing a PET examination on a subject P placed on the sleeper 10. The imaging unit corresponds to a detector or the like that detects gamma rays emitted from the subject P.

[Second Embodiment]
In the first embodiment, the configuration in which the measurement position with respect to the top plate 10a is relatively changed by making one measuring device 30 movable has been described. In the second embodiment, a configuration will be described in which a plurality of measuring devices 30 arranged at different positions with respect to the top plate 10a are selectively used to relatively change the measuring position with respect to the top plate 10a. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

14 and 15 are diagrams for explaining the measuring device 30 and the lighting device 50 provided on the gantry 20 of the present embodiment. Here, FIG. 14 is a diagram showing a state inside the bore 20a as seen from the bed 10 side (front side) of the gantry 20. Further, FIG. 15 is a diagram showing a state inside the bore 20a as viewed from the AA cross section of FIG. 14 in the −X axis direction side.

As shown in FIGS. 14 and 15, a plurality of measuring devices 30 are provided on the inner wall of the bore 20a included in the gantry 20. Each of the measuring devices 30 is fixed at a different position from each other. For example, the measuring device 30 is provided in an arc shape around the long axis of the top plate 10a. The position of the measuring device 30 in the bore 20a is not particularly limited, but it is preferably provided on the rear side or the front side where the face and neck of the subject P can be photographed. 14 and 15 show an example in which five measuring devices 30 (30a to 30e) are provided on the rear side in an arc shape.

Further, a lighting device 50 is provided on the inner wall of the bore 20a. Here, the installation position and the number of the lighting devices 50 are not particularly limited, but it is preferable to provide the positions and the number capable of covering the photographing range of each of the measuring devices 30. Note that FIGS. 14 and 15 show an example in which lighting devices 50 (50a to 50d) are provided between the measuring devices 30.

Next, the processing circuit 64 (measurement control function 64a and dimming function 64c) of the present embodiment will be described.

The measurement control function 64a is an example of the measurement control unit. Further, the measurement control function 64a functions as an example of the mechanism unit together with the plurality of measurement devices 30 described above. The measurement control function 64a selectively uses one measurement device 30 from the plurality of measurement devices 30. Specifically, the measurement control function 64a selects the measurement device 30 used for photographing the subject P from the plurality of measurement devices 30, and measures the subject P using the selected measurement device 30. Let me.

Here, as the method for selecting the measuring device 30, the same method as the method for specifying the measuring device 30 in the first embodiment described above can be used. For example, when the posture of the subject P placed on the top plate 10a is instructed by the measurement control function 64a via the input interface 6, the measurement control function 64a identifies the measurement position according to the posture of the subject P and determines the measurement position. The measuring device 30 arranged in the above or the measuring device 30 near the measurement position is selected. Further, when the position information of the top plate 10a is instructed, the same processing can be performed. The number of the measuring devices 30 selected by the measurement control function 64a is not limited to one, and may be a plurality. When a plurality of measuring devices 30 are selected, the heartbeat detection function 64b detects the heartbeat of the subject P placed on the top plate 10a based on the heartbeat information measured by each of the measuring devices 30.

The dimming function 64c controls the operation of the lighting device 50 as in the first embodiment. When a plurality of lighting devices 50 are provided, the dimming function 64c selects the lighting device 50 used for illuminating the subject P from among the plurality of lighting devices 50, and uses the selected lighting device. Illuminates the subject P.

Here, the selection method of the lighting device 50 is not particularly limited, and various methods can be adopted. For example, the dimming function 64c may select the lighting device 50 close to the position of the measuring device 30 selected by the measurement control function 64a.

For example, when the measuring device 30b is selected from the measuring devices 30a to 30e shown in FIG. 14, the dimming function 64c is one or both of the lighting device 50a and the lighting device 50b adjacent to the measuring device 30b. Select. The lighting device 50 other than the selected lighting device 50 may be turned off or emitted at low brightness.

Next, the operation of the processing circuit 64 according to the present embodiment will be described with reference to FIG. FIG. 16 is a flowchart showing an example of MR imaging processing executed by the processing circuit 64 of the present embodiment. In this processing, a processing example when a plurality of lighting devices 50 are provided will be described.

First, the measurement control function 64a selects the measurement device 30 arranged at the measurement position according to the posture of the subject P from among the plurality of measurement devices 30 (step S21).

Subsequently, the dimming function 64c selects the lighting device 50 to be used from the plurality of lighting devices 50 based on the position of the measuring device 30 selected in step S21 (step S22).

Subsequently, the dimming function 64c determines whether or not the signal level of the heartbeat signal detected by the heartbeat detection function 64b is equal to or higher than the threshold value (step S23). Here, when the signal level of the heartbeat signal is less than the threshold value (step S23; No), the dimming function 64c raises the illuminance of the lighting device 50 by a predetermined amount (step S24), and returns to step S23.

On the other hand, when the signal level of the heartbeat signal is equal to or higher than the threshold value (step S23; Yes), the process proceeds to step S25. Subsequently, the image pickup function 64d MR-images the subject P at a predetermined cardiac time phase timing based on the heartbeat signal detected by the heartbeat detection function 64b (step S25).

As described above, the magnetic resonance imaging device 1 of the present embodiment measures the heartbeat of the subject P by selectively using one measuring device 30 from among a plurality of measuring devices 30 arranged at different positions from each other. To do.

As a result, the magnetic resonance imaging device 1 can measure the heartbeat of the subject P by using the measuring device 30 at the measurement position according to the position of the top plate 10a and the posture of the subject P. Heart rate measurement can be performed under suitable conditions. Therefore, the magnetic resonance imaging device 1 can measure the heartbeat of the subject P in a non-contact manner and with high accuracy.

Further, the magnetic resonance imaging device 1 adjusts the illuminance of the lighting device 50 according to the state of the heartbeat information (heartbeat signal) output by the measuring device 30. As a result, the magnetic resonance imaging device 1 can secure the illuminance required for the measurement of the heartbeat, so that the measurement accuracy can be improved.

The above-described embodiment can be appropriately modified and implemented by changing a part of the configuration or function of the magnetic resonance imaging device 1. Therefore, in the following, some modifications according to the above-described embodiment will be described as other embodiments. In the following, points different from the above-described embodiment will be mainly described, and detailed description of points common to the contents already described will be omitted. Further, the modifications described below may be carried out individually or in combination as appropriate.

(Modification example 1)
In the above-described embodiment, the configuration in which the measuring device 30 is provided in the bore 20a has been described. However, the installation position of the measuring device 30 is not limited to this, and it may be installed on the end face 20b of the gantry 20 as in the modification 1 of the first embodiment.

FIG. 17 is a diagram for explaining a mounting position of the measuring device 30 according to this modified example. Here, FIG. 17 is a view of the gantry 20 as viewed from the rear side.

As shown in FIG. 17, a plurality of measuring devices 30 are provided on the end surface 20b of the gantry 20 near the opening of the bore 20a. Specifically, an example is shown in which five measuring devices 30 (30a to 30e) are arranged side by side in an arc shape in the same state as in FIG.

Further, a lighting device 50 is also provided on the end surface 20b of the gantry 20. FIG. 8 shows an example in which lighting devices 50 (50a to 50d) are provided between the measuring devices 30 in the same state as in FIG.

As a result, the magnetic resonance imaging device 1 according to the present modification can measure the heartbeat of the subject P by using the measuring device 30 at the measurement position according to the position of the top plate 10a and the posture of the subject P. , The heart rate measurement of the subject P can be performed under suitable conditions. Therefore, the magnetic resonance imaging device 1 can measure the heartbeat of the subject P in a non-contact manner and with high accuracy.

(Modification 2)
In the above-described embodiment, the configuration in which the plurality of measuring devices 30 are directly attached to the inner wall of the bore 20a has been described. However, the configuration is not limited to this, and a plurality of measuring devices 30 may be attached via the support arm 40 or the like described in the first embodiment.

18 and 19 are diagrams for explaining the measuring device 30 and the lighting device 50 provided on the gantry 20 of this modified example. Here, FIG. 18 is a diagram showing a state inside the bore 20a as seen from the bed 10 side (front side) of the gantry 20. Further, FIG. 19 is a diagram showing a state inside the bore 20a as viewed from the AA cross section of FIG. 18 on the −X axis direction side.

As shown in FIGS. 18 and 19, a plurality of measuring devices 30 are provided in the bore 20a of the gantry 20. Specifically, the measuring device 30 is supported by a support arm 40 provided in the bore 20a. Here, each of the measuring devices 30 is fixed to the inner wall (inner circumference) 40a side of the support arm 40, and is provided at predetermined intervals. 18 and 19 show an example in which five measuring devices 30 (30a to 30e) are provided on the inner wall (inner circumference) 40a of the support arm 40, similarly to FIGS. 14 and 15. In addition, in FIGS. 18 and 19, the support arm 40 can be moved in the Z-axis direction by the above-mentioned second moving mechanism 42, but may be fixed to the rear side or the like.

Further, FIGS. 18 and 19 show an example in which a plurality of lighting devices 50 are provided on the inner wall (inner circumference) 40a side of the support arm 40. Specifically, as in FIGS. 14 and 15, an example in which lighting devices 50 (50a to 50d) are provided between the measuring devices 30 is shown. The installation form of the lighting device 50 is not limited to this, and may be provided on the inner wall of the bore 20a. Further, the lighting device 50 may be configured to be integrally provided with the measuring device 30.

In the case of the configurations of FIGS. 18 and 19 described above, the measurement control function 64a controls the measurement position of the top plate 10a in the longitudinal direction together with the selection of the measurement device 30. For example, the measurement control function 64a moves the measurement device 30 (support arm 40) to the measurement position according to the position information when the position information of the top plate 10a in the Z-axis direction is instructed via the input interface 6. Let me.

As a result, the magnetic resonance imaging device 1 of the present modification can measure the heartbeat of the subject P by using the measuring device 30 at the measurement position according to the position of the top plate 10a and the posture of the subject P. The heart rate measurement of the subject P can be performed under suitable conditions. Further, since the magnetic resonance imaging device 1 can arrange the measuring device 30 at a measurement position according to the position of the top plate 10a and the posture of the subject P, the heartbeat measurement of the subject P is performed under suitable conditions. Can be done. Therefore, the magnetic resonance imaging device 1 can measure the heartbeat of the subject P in a non-contact manner and with high accuracy.

[Third Embodiment]
In the first embodiment described above, the configuration in which the gantry 20 includes the measuring device 30 and the support arm 40 has been described. However, the measuring device 30 and the support arm 40 may be formed as devices independent of the gantry 20.

Specifically, the support arm 40 (or the mobile screen device 70) itself to which the measuring device 30 is attached is made detachable from the gantry 20 so that the support arm 40 (or the mobile screen device 70) itself becomes independent. It may be used as a heart rate measuring device.

Further, in this case, the attachment destination of the heart rate measuring device is not limited to the gantry 20 and may be the sleeper 10. For example, as described with reference to FIG. 12, the sleeper 10 may be provided with the heartbeat measurement device by connecting the heart rate measuring device (for example, the mobile screen device 70) to the sleeper 10.

As described above, the heart rate measuring device of the present embodiment can be detachably attached to the sleeper 10 or the gantry 20. As a result, the operator who operates the magnetic resonance imaging device 1 can perform operations such as removing the heart rate measuring device from the sleeper 10 or the gantry 20 when the heart rate measurement of the subject P is not performed.

Although some embodiments and modifications of the present invention have been described above, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These embodiments and modifications can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the gist of the invention. These embodiments and modifications are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

1 Magnetic resonance imaging device 10 Sleeper device 20 Stand 30 Measuring device 40 Support arm 41 First moving mechanism 42 Second moving mechanism 50 Lighting device 64 Processing circuit 64a Measurement control function 64b Heartbeat detection function 64c Dimming function 64d Imaging function

Claims (17)

A measuring device that captures the subject placed on the top plate and outputs heartbeat information related to the heartbeat,
A mechanism unit that changes the measurement position of the measuring device so that the relative position of the measuring device with respect to the top plate changes.
A medical diagnostic imaging device. Further provided with a stand for accommodating the imaging unit related to the acquisition of the medical image of the subject,
The medical diagnostic imaging apparatus according to claim 1, wherein the mechanical unit is attached to the gantry. Further provided with a sleeper to support the top plate,
The gantry has a magnet that generates a static magnetic field.
The medical image diagnostic apparatus according to claim 2, wherein the mechanism unit is provided at a position opposite to the side on which the sleeper is arranged with respect to the magnet of the mount. The medical image diagnostic apparatus according to claim 2, wherein the mechanical portion is provided on an inner wall of a hollow portion to which the top plate is fed, which is provided on the gantry. The medical image diagnostic device according to claim 1, wherein the mechanical unit has a moving mechanism for moving the measuring device around a long axis of the top plate. The medical image diagnostic device according to claim 1, wherein the mechanical unit has a moving mechanism for moving the measuring device in the long axis direction of the top plate. The medical image diagnostic apparatus according to claim 5 or 6, further comprising a measurement control unit that controls the movement mechanism and moves the measurement device to a measurement position where the subject is imaged. The medical image diagnostic device according to claim 1, further comprising a measurement control unit that selects at least one measuring device to be used for photographing the subject from the plurality of measuring devices arranged at different positions. The medical image diagnostic device according to claim 8, wherein the measurement control unit selects the measurement device arranged at a measurement position for photographing the subject. The medical diagnostic imaging apparatus according to claim 7 or 9, wherein the measurement control unit identifies the measurement position based on position information indicating the position of the top plate. The medical image diagnostic apparatus according to claim 7 or 9, wherein the measurement control unit identifies the measurement position based on information indicating the posture of the subject placed on the top plate. The medical image diagnostic apparatus according to claim 7 or 9, wherein the measurement control unit identifies the measurement position facing the face of the subject. A lighting device that illuminates the top plate,
An adjusting unit that adjusts the illuminance of the lighting device according to the state of the heartbeat information, and
The medical image diagnostic apparatus according to claim 1, further comprising. The medical image diagnostic device according to claim 1, further comprising an adjusting unit that adjusts the sensitivity of the measuring device according to the state of the heartbeat information. The medical image diagnostic apparatus according to claim 13 or 14, wherein the adjusting unit adjusts according to a heartbeat signal level extracted from the heartbeat information. The medical image diagnostic apparatus according to claim 15, wherein the adjusting unit repeats adjustment until the signal level becomes equal to or higher than a threshold value. A heart rate measuring device that can be attached to and detached from the top plate on which the subject is placed or a stand that houses an imaging unit for acquiring data related to the generation of a medical image of the subject.
A measuring device that photographs a subject placed on the top plate and outputs heartbeat information related to the heartbeat.
A mechanism unit that changes the measurement position of the measuring device so that the relative position of the measuring device with respect to the top plate changes.
A heart rate measuring device equipped with.

Images