JPH04292143A - Image relieving method at the time when person to be examined moves - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tomography apparatus that utilizes magnetic resonance phenomena, and more particularly to processing for interrupting imaging and restoring images when a subject moves.

0002

2. Description of the Related Art Photographing by a medical image diagnostic apparatus often takes time, and the subject may move during the photographing. As a result, the captured image contains artifacts due to the movement of the subject, making it unsuitable for diagnosis. Therefore, if the subject moves during imaging, the imaging must be stopped and restarted from the beginning, which is inefficient. Therefore, in conventional technology, if the subject moves during imaging, the operator can cancel the imaging if sufficient data has been collected to reconstruct the image. This allows the image to be reconstructed using the data collected up to that point and prevents artifacts caused by the subject's movements from appearing in the image.

0003

[Problems to be Solved by the Invention] The above-mentioned prior art has the problem of overlooking the movement of the subject because the operator performs visual confirmation.

[0004] An object of the present invention is to realize image relief by providing a mechanism that automatically detects the movement of a subject instead of having an operator sense the movement of the subject.

[0005]

[Means for solving the problem] The above objective is achieved by a mechanism that detects the movement of the subject and a function that uses the detected movement and collected data to determine whether to stop imaging and perform image rescue. Ru.

[0006]

[Effect] The function that detects the movement of the examinee eliminates the need for the operator to visually confirm the movement of the examinee, which prevents the operator from overlooking the movement of the examinee and prevents artifacts caused by the movement of the examinee from entering the image. It becomes like this. In addition, there is a function that determines whether to stop imaging and perform image rescue based on the detected movement and collected data. Depending on the degree of patient movement, it is possible to determine whether to stop imaging and perform image reconstruction. By being able to automatically determine whether appropriate data is being collected, it is possible to perform image relief when the subject moves.

[0007]

[Embodiment] An embodiment of the present invention will be explained below with reference to FIG.

[0008] The movements of the subject 101 who is the subject of diagnosis are as follows:
Sensed by sensing mechanism 102. The output of the sensing mechanism 102 is input to a determining mechanism 103. The determination mechanism 103 includes an input section that inputs the inputted output of the sensing mechanism 102 to the storage device in order to store it in the storage function, and a storage function that stores the inputted output of the sensing mechanism. The input output of the sensing mechanism is compared with the previously stored outputs of the plurality of sensing mechanisms, a correlation with the previously stored output of the sensing mechanism is determined, and from the correlation, It is determined whether to continue imaging or to stop imaging, and also receives information 105 indicating whether data necessary for image reconstruction has been collected, and determines whether to perform reconstruction. The output of the determination mechanism 103 is input to a command generation mechanism 104. The command generation mechanism 104 issues a photographing stop command and an image reconstruction start command 106.

An embodiment in which the present invention is applied to a magnetic resonance imaging apparatus will be described below with reference to FIG. 201 is
A static magnetic field generation system 202 for generating a uniform static magnetic field is a transmission system 2 that generates a high frequency pulse that excites spins.
03 is a gradient magnetic field generation system that can linearly change the intensity independently in the X, Y, and Z directions, and 204 is a receiving system that receives electromagnetic waves generated from the subject and performs A/D conversion after detection. , 205 is a processing device that performs various calculations necessary for image reconstruction based on measurement data from the receiving system;
6 is a CRT for displaying images such as reconstruction results; 207 is a pulse sequence file that stores control procedures for the operation of each system in the configuration; 208 is a CRT for displaying images such as reconstruction results; Sequence control unit for controlling operation timing, 209
210 is a sensing mechanism that senses the movement of the subject, 210 is a determination mechanism that determines the output of the sensing mechanism 209, and 211 is
This is a command generation mechanism that generates a photographing stop command and an image reconstruction start command based on the determination result made by the determination mechanism 210, and is composed of the above.

FIG. 3 shows an explanatory diagram of the operation of the determining means for implementing image rescue. The processing of the determination mechanism is to organize the information from the sensing mechanism and convert it into data that can be used for the following processing (step 301), and determine whether the movement of the subject is such a movement that it causes image artifacts to be introduced. Processing step 302: Processing step 30 instructing the command generating mechanism to issue a photographing stop command.
3. Processing step 304 to determine whether sufficient data has been collected for image reconstruction. Discard data after the subject moves and instruct the command generation mechanism to issue an image reconstruction start command. It consists of a processing step 305 for instructing the generating mechanism.

[0011]

[Effects of the Invention] According to the present invention, if the subject moves during imaging, the movement of the subject is detected, the imaging is automatically stopped, and the image is reconstructed. If sufficient data has been collected before, the image can be salvaged by reconstructing the image using only the data collected so far.

[0012]Therefore, there is no need to restart the photographing process from the beginning, which has the effect of improving the photographing throughput.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment in which the present invention is applied to a magnetic resonance imaging apparatus.

FIG. 3 is an explanatory diagram of the operation of a determining means for implementing image rescue.

[Explanation of symbols]

101...Diagnosis target, 102...Sensing mechanism, 103...Judgment mechanism, 104...Command generation mechanism.

Claims (7)

[Claims] 1. Medical image diagnosis comprising: a sensing mechanism that senses the movement of a subject; a determining mechanism that determines the output of the sensing mechanism; and a command generating mechanism that generates a command based on the determination result of the determining mechanism. In the apparatus, the motion of the subject, which is the output of the sensing mechanism, is determined, and based on the determination result, if the command generation mechanism has collected enough data to stop imaging and reconstruct the image, start image reconstruction. An image relief method when a subject moves, characterized by issuing a command. 2. The image rescue method according to claim 1, wherein when sufficient data for image reconstruction is collected, the information is reported to the outside. 3. In claim 1, after image reconstruction is performed, information that image relief has been performed is entered in image attribute information;
An image relief method when a subject moves, characterized in that the information is displayed on a CRT when displaying an image. 4. In claim 1, the determination mechanism comprises:
An image rescue method when a subject moves, characterized by having a function of notifying the judgment result to the outside and a function of changing the content. 5. In claim 1, the determination mechanism comprises:
An image when a subject moves, characterized by having a memory function for storing the output of the sensing mechanism, and making it possible to use the stored output to determine the output of the sensing mechanism. Remedy method. 6. In claim 1, the determination mechanism comprises:
An image relief method when a subject moves, characterized in that the output of the sensing mechanism is determined based on a threshold value. 7. In claim 1, the determination mechanism comprises:
An image relief method when a subject moves, characterized in that the output of the sensing mechanism is determined by pattern recognition.