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Magnetic resonance imaging device and magnetic resonance imaging method

A magnetic resonance imaging and nuclear magnetic resonance technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve the problem of low versatility and achieve the effect of preventing the extension of imaging time

Active Publication Date: 2015-03-18
HITACHI HEALTHCARE MFG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the method of using an external monitor, there is a disadvantage of low versatility, such as monitoring only a specific direction of breathing movement (generally, the up and down movement of the abdominal wall)
For example, breathing motion includes not only up-and-down motion but also motion in the head-foot direction (hereinafter referred to as the H-F direction), but the pressure sensor fixed to the abdominal wall cannot follow the slice in the H-F direction motion. location for camera

Method used

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  • Magnetic resonance imaging device and magnetic resonance imaging method
  • Magnetic resonance imaging device and magnetic resonance imaging method
  • Magnetic resonance imaging device and magnetic resonance imaging method

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Experimental program
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no. 1 approach

[0041] The MRI apparatus of the present embodiment is characterized in that the MRI apparatus uses a respiratory movement monitor (one form of an internal monitor) using navigator echoes, and a respiratory movement monitor of the abdominal wall (one form of an external monitor) such as a pressure sensor. ), to serve as multiple motion monitors.

[0042] exist figure 2 as well as image 3 The procedure of imaging control performed by the control unit 111 is shown. figure 2 It is a flowchart showing the procedure of the whole imaging, image 3 is a flowchart showing a part of prescanning.

[0043] First, the imaging conditions are set in the imaging condition setting unit 1111 (S200). Here, the slice position is set based on the scout scan (a large-area image captured on the subject with a lower resolution before the examination). (direction), slice width, gate window and other conditions related to the imaging area, and set the parameters of the pulse sequence used in the...

no. 2 approach

[0070] This embodiment is the same as the first embodiment in that position information from an external monitor such as a pressure sensor is associated with position information from a navigation sequence, and imaging is controlled using the associated information during main imaging. The present embodiment is characterized in that it includes an update function for establishing related information. That is, the MRI apparatus of the present embodiment includes a storage unit that stores associated information created by a body motion processing unit, and the body motion processing unit uses newly acquired body motion information from at least one of a plurality of body motion monitors to update the stored Association information in the storage unit.

[0071] exist Figure 9 The procedure of the second embodiment is shown. exist Figure 9 in, with figure 2 Steps with the same processing content as the steps in are denoted by the same reference numerals. First, in the cas...

no. 3 approach

[0080] In the first embodiment, the case of estimating the position of the direction measured in the navigation sequence from the body movement correlation information, and performing slice correction or gating on the estimated direction in the main imaging is described, but the characteristic of this embodiment is This is to perform slice correction in two or more directions using both the estimated position and the position actually measured by the external monitor. That is, in the MRI apparatus according to this embodiment, the plurality of body motion monitors include body motion monitors that detect body motion information in different directions of motion, and the control unit controls the imaging unit using the body motion information in different directions.

[0081] The sequence of this embodiment is the same as figure 2 The sequence shown for the first embodiment is substantially the same. However, in this embodiment, the step S202 of calculating the correction amo...

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Abstract

According to the present invention, in order to respond to positional change in a variety of directions due to body motion such as respiratory motion, and to prevent occurrence of dead time in measurement or an increase in imaging time due to acquisition of body motion information, a control unit of an MRI device acquires association information in which body motion information detected by an external monitor, such as a pressure sensor for monitoring the movement of the inspection subject, and body motion information measured from an NMR signal by navigator sequences are associated with each other in advance. When imaging is performed, the body motion information from the navigator is estimated using the body motion information detected by the external monitor worn by the inspection subject and the association information acquired in advance, and there is performed a control such as performing gating imaging or correcting the imaging slice position on the basis of the estimated body motion position.

Description

technical field [0001] The present invention relates to a magnetic resonance imaging (MRI) apparatus that measures nuclear magnetic resonance (hereinafter referred to as "NMR") signals from hydrogen, phosphorus, etc. in a subject, and visualizes nuclear density distribution, relaxation time distribution, etc. In particular, it relates to an MRI apparatus that performs imaging in consideration of body motion of an inspection subject. Background technique [0002] In examinations using an MRI apparatus, artifacts caused by repeated breathing movements become a problem. As the simplest coping method, there is breath-holding videography, which is widely used in clinical practice. However, breath-hold imaging has limitations such as that it cannot be applied to subjects who have difficulty holding their breath, or that the time of imaging at one time is limited to the time that can hold their breath (about 15 seconds as long). [0003] As a method of suppressing respiratory mot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055
CPCA61B5/7285A61B5/0555A61B5/721A61B5/113A61B5/055A61B5/0037A61B5/1128
Inventor 后藤智宏泷泽将宏
Owner HITACHI HEALTHCARE MFG LTD
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