System and method for prospective correction of high order eddy-current-induced distortion in diffusion-weighted echo planar imaging

一种涡流、高阶的技术，应用在测量装置、测量磁变量、仪器等方向，能够解决增加b值、梯度振幅和转换速度大等问题

Active Publication Date: 2012-11-14
GENERAL ELECTRIC CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, spatially high-order uncompensated eddy currents due to gradient coil leakage fields or just higher-order eddy currents (HOEC) can also be large due to the desire to increase b-values ​​and increases in gradient amplitude and transition speed in modern MR scanners

Method used

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  • System and method for prospective correction of high order eddy-current-induced distortion in diffusion-weighted echo planar imaging
  • System and method for prospective correction of high order eddy-current-induced distortion in diffusion-weighted echo planar imaging
  • System and method for prospective correction of high order eddy-current-induced distortion in diffusion-weighted echo planar imaging

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Embodiment Construction

[0022] now refer to figure 1 , where the main components of a magnetic resonance imaging (MRI) system 10 incorporating an embodiment of the present invention are shown. Operation of the system is controlled for certain functions from an operator console 12 , which in this example includes a keyboard or other input device 13 , a control panel 14 and a display screen 16 . Console 12 communicates via link 18 with a separate computer system 20 that enables an operator to control the generation of images and their display on display screen 16 . Computer system 20 includes a plurality of modules that communicate with each other via backplane 20a. These modules include an image processor module 22, a CPU module 24 and a memory module 26, known in the art as a frame buffer, for storing an array of image data. The computer system 20 communicates with a separate system control 32 via a high speed serial link 34 . The input device 13 may include a mouse, joystick, keyboard, trackball,...

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Abstract

A computer is programmed to acquire calibration data from a calibration scan, the calibration data configured to characterize high order eddy current (HOEC) generated magnetic field error of an imaging system. The computer is also programmed to process the calibration data to generate a plurality of basis coefficients and a plurality of time constants and to calculate a plurality of basis correction coefficients based on the plurality of basis coefficients, the plurality of time constants, and gradient waveforms in a given pulse sequence. The computer is further programmed to execute a diffusion-weighted imaging scan that comprises application of a DW-EPI pulse sequence to acquire MR data from an imaging subject and reconstruction of an image based on the acquired MR data. The computer is also programmed to apply HOEC-generated magnetic field error correction during image reconstruction configured to reduce HOEC-induced distortion in the reconstructed image.

Description

[0001] Cross References to Related Applications [0002] This application is a non-provisional application of, and claims priority from, US Provisional Patent Application Serial No. 61 / 476,936, filed April 19, 2011, the disclosure of which is incorporated herein by reference. technical field [0003] Embodiments of the present invention relate generally to magnetic resonance (MR) imaging, and more specifically to correcting distortions induced by higher order eddy currents in diffusion weighted echo planar imaging. Background technique [0004] When a substance such as human tissue is subjected to a uniform magnetic field (polarization field B 0 ), the individual magnetic moments of the spins in the tissue try to align with this polarization field, but precess around it in random order at their characteristic Larmor frequency. If the substance or tissue is subjected to a magnetic field located in the x-y plane and close to the Larmor frequency (excitation field B 1 ), then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/565
CPCG01R33/5616G01R33/56518G01R33/56341
Inventor 徐丹J·K·迈尔K·F·金B·D·科利克
Owner GENERAL ELECTRIC CO
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