System for fat suppression in obtaining of MR image

A technology of fat and imaging, applied in the fields of application, medical science, sensor, etc., can solve the problem of inability to obtain fat suppression

Active Publication Date: 2011-09-21
SIEMENS HEALTHCARE GMBH
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  • System for fat suppression in obtaining of MR image
  • System for fat suppression in obtaining of MR image
  • System for fat suppression in obtaining of MR image

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[0012] A system improves fat suppression in MR image acquisition using an MR pulse sequence that uses one or more RF pulses to form echoes and a low bandwidth excitation RF pulse. The system advantageously uses different slice-selective gradient magnitudes for the RF pulses of EPI (also referred to as low-bandwidth excitation), together with slice-selective gradient inversion, to improve fat suppression in spin echo EPI diffusion imaging. When the proton spins return to the same starting phase they had after the initial excitation RF pulse, an RF refocusing pulse is applied. A spin echo sequence uses eg a 180° pulse to refocus the proton spins to generate a signal echo, and a gradient echo sequence uses a refocusing gradient to maximize the remaining transverse magnetization.

[0013] figure 1 A system 10 for fat signal suppressed MR imaging is shown. System 10 uses spin echo for signal generation to improve fat suppression in pulse sequences. In one embodiment, the system ...

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Abstract

The invention relates to a system for fat suppression in obtaining of MR image, comprising: an RF signal generator for generating the RF pulses in an MR pulse sequence, including an RF excitation pulse and an RF re-focusing pulse after the RF excitation pulse, using one or more RF pulses for an echo signal structure. A magnetic field slice selection gradient generator generates two different slice selection magnetic field gradients to be used together with the RF excitation pulse and the RF re-focusing pulse correspondingly, wherein the first and second slice selection magnetic field gradients are substantially different in amplitude. An MR imaging control unit controls the obtaining of MR imaging data substantially suppressed in fat signal using the generated RF signals and the differentslice selection magnetic field gradients.

Description

[0001] cross reference [0002] This is a non-provisional application with provisional application serial number 61 / 314,653 filed March 17, 2010 by V. Deshpande. technical field [0003] The present invention relates to a system for fat signal suppression in MR imaging. Background technique [0004] Diffusion imaging in body and breast MR applications is performed using spin echo EPI (echo planar imaging) pulse sequences. Data can be acquired using double refocusing or the standard Stejskal Tanner diffusion protocol (single focusing). It is often desirable to suppress the fat signal in such acquisitions because unsuppressed fat signal leads to spatial displacement and ghosting in the resulting image. Known methods for fat suppression include the use of a spectrally selective fat suppression pulse before the EPI (echo planar imaging) excitation pulse, spectrally selective partial inversion recovery (SPIR) or spectral adiabatic inversion pulse (SPAIR) either one. Water sti...

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Application Information

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IPC IPC(8): A61B5/055
Inventor V·德什潘德
Owner SIEMENS HEALTHCARE GMBH
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