阅读说明：本技术 磁共振成像系统、非接触式运动监测方法和存储介质 (Magnetic resonance imaging system, non-contact motion monitoring method, and storage medium ) 是由 夏新源 胡凌志 李怡然 张双悦 曹拓宇 于 2020-06-19 设计创作，主要内容包括：本申请涉及一种磁共振成像系统、非接触式运动监测方法和存储介质。其中,该非接触式运动监测方法包括：获取磁共振成像系统的扫描视野内的受检者表面的运动信息,其中,运动信息基于非接触式运动监测单元获取；从运动信息中提取受检者表面的空间特征信息和受检者的生理运动信息,以及根据空间特征信息确定受检者的姿态变化信息。通过本申请,解决了相关技术中的运动监测系统不能够同时监测受检者的姿态变化信息和因生命体征产生的生理运动的问题,实现了对受检者的姿态变化信息和因生命体征产生的生理运动的同时监测。(The present application relates to a magnetic resonance imaging system, a non-contact motion monitoring method and a storage medium. The non-contact motion monitoring method comprises the following steps: acquiring motion information of a surface of a subject in a scanning field of view of a magnetic resonance imaging system, wherein the motion information is acquired based on a non-contact motion monitoring unit; extracting spatial characteristic information of the surface of the subject and physiological motion information of the subject from the motion information, and determining posture change information of the subject according to the spatial characteristic information. Through the method and the device, the problem that a motion monitoring system in the related technology cannot monitor the posture change information of the examined person and the physiological motion generated due to the vital signs at the same time is solved, and the posture change information of the examined person and the physiological motion generated due to the vital signs are monitored at the same time.)

1. A magnetic resonance imaging system, the magnetic resonance imaging system comprising: the system comprises a scanning bed, a magnetic resonance scanner, a non-contact motion monitoring unit and computer equipment; the magnetic resonance scanner is formed with a scanning chamber having a scanning field of view; the scan bed is used for carrying a subject and moving the subject into the scan field of view; the magnetic resonance scanner and the scanning bed are respectively connected with the computer equipment; the computer device is used for controlling the movement of the scanning bed, controlling the magnetic resonance scanner to acquire the magnetic resonance data of the examinee and reconstructing a magnetic resonance image according to the magnetic resonance data; the non-contact motion monitoring unit comprises a frequency modulated continuous wave sensor connected to the computer device, wherein,

the frequency-modulated continuous wave sensor is used for transmitting a radio frequency sweep signal to the scanning visual field, receiving a radio frequency echo signal reflected by the surface of a detected object in the scanning visual field, and determining the motion information of the surface of the detected object according to the radio frequency sweep signal and the radio frequency echo signal;

the computer device is further used for extracting the spatial characteristic information of the surface of the subject and the physiological motion information of the subject from the motion information, and determining the posture change information of the subject according to the spatial characteristic information.

2. The system of claim 1, wherein the plurality of frequency modulated continuous wave sensors are arranged in a plurality, the scan field of view is covered by radio frequency sweep signals emitted by the plurality of frequency modulated continuous wave sensors, and the radio frequency sweep signals emitted by each of the frequency modulated continuous wave sensors at the same time do not interfere with each other.

3. The magnetic resonance imaging system of claim 1, wherein the frequency modulated continuous wave sensor comprises a transmitting antenna and a receiving antenna embedded in the magnetic resonance scanner of the magnetic resonance imaging system.

4. The mri system of claim 2, wherein the plurality of fm continuous wave sensors includes a first fm continuous wave sensor and a second fm continuous wave sensor, and a transmitting antenna and a receiving antenna of the first fm continuous wave sensor are embedded in the mri scanner of the mri system and distributed on one side of the scanning field of view along an axial direction; and the transmitting antenna and the receiving antenna of the second frequency modulation continuous wave sensor are embedded in the magnetic resonance scanner of the magnetic resonance imaging system and distributed on the other side of the scanning visual field along the axial direction.

5. The magnetic resonance imaging system of claim 1, wherein the frequency modulated continuous wave sensor comprises at least one transmit antenna, and a plurality of receive antennas.

6. The magnetic resonance imaging system of claim 1, wherein the frequency of the radio frequency swept frequency signal emitted by the frequency modulated continuous wave sensor is not lower than 60 GHz.

7. A non-contact motion monitoring method applied to the magnetic resonance imaging system according to any one of claims 1 to 6, characterized by comprising:

acquiring motion information of a subject surface within a scanning field of view of a magnetic resonance imaging system, wherein the motion information is acquired based on the non-contact motion monitoring unit;

extracting spatial characteristic information of the surface of the subject and physiological motion information of the subject from the motion information, and determining posture change information of the subject according to the spatial characteristic information.

8. The contactless motion monitoring method according to claim 7, wherein after extracting spatial feature information of the subject surface and physiological motion information of the subject from the motion information, and determining posture change information of the subject from the spatial feature information, the method further comprises:

and generating a gating acquisition signal for controlling the magnetic resonance imaging system to acquire data according to the posture change information and the physiological motion information.

9. The contactless motion monitoring method according to claim 7, wherein after extracting spatial feature information of the subject surface and physiological motion information of the subject from the motion information, and determining posture change information of the subject from the spatial feature information, the method further comprises:

and in the process of reconstructing a magnetic resonance image by the magnetic resonance imaging system, carrying out artifact correction on the magnetic resonance image according to the attitude change information and the physiological motion information.

10. The method of claim 7, wherein acquiring motion information of a surface of a subject within a scanning field of view of a magnetic resonance imaging system with the motion information acquired by the plurality of frequency modulated continuous wave sensors, respectively, comprises:

and respectively acquiring the motion information of each frequency modulation continuous wave sensor in the plurality of frequency modulation continuous wave sensors at the same moment, and fusing the motion information of each frequency modulation continuous wave sensor at the same moment according to the spatial position of the scanning visual field covered by each frequency modulation continuous wave sensor to obtain the motion information of the surface of the detected person.

11. The method of claim 7, wherein the spatial signature information comprises contour signature information; extracting spatial feature information of the surface of the subject from the motion information, and determining posture change information of the subject according to the spatial feature information includes:

extracting contour feature information of the surface of the subject from the motion information;

tracking motion information of a contour of a surface of the subject according to the contour feature information;

determining the pose change information of the subject according to motion information of a contour of a surface of the subject.

12. The method of claim 7, wherein extracting spatial feature information of the subject's surface and physiological motion information of the subject from the motion information, and determining pose change information of the subject based on the spatial feature information comprises:

extracting motion information corresponding to the region of interest from the motion information;

extracting spatial feature information of the surface of the subject and physiological motion information of the subject from motion information corresponding to a region of interest, and determining posture change information of the subject according to the spatial feature information.

13. A storage medium having a computer program stored thereon, wherein the computer program is arranged to perform the contactless motion monitoring method of any of claims 7 to 12 when run.