Magnetic resonance imaging method and system aiming at small targets

Abstract

The invention relates to a magnetic resonance imaging method and a magnetic resonance imaging system aiming at small targets. The magnetic resonance imaging method comprises the steps of: positioning a small-target region; exerting plane echo dispersion weighted imaging sequences in the small-target region; collecting signals released through the excitation of the plane echo dispersion weighted imaging sequences, and obtaining K space data according to the signals; and carrying out Fourier transform on the K space data to obtain small target images. The small-target region positioning comprises the steps of: exerting fast small-angle excitation sequences, and obtaining three positioning images of the cross section, the sagittal plane and the coronal plane; and obtaining secondary positioning images aiming at the small-target region according to the three positioning images of the cross section, the sagittal plane and the coronal plane, and carrying out positioning. The plane echo dispersion weighted imaging sequence exertion step comprises the process that: the plane echo dispersion weighted imaging sequences formed through the combination of selective excitation of the two-dimensional space is excited for many times. Through positioning the small-target region and exerting the plane echo dispersion weighted imaging sequences on the small-target region, the goal of carrying out magnetic resonance imaging on the small-target region is reached.

Description

【Technical field】 [0001] The invention relates to magnetic resonance imaging technology, in particular to a magnetic resonance imaging method and system for small targets. 【Background technique】 [0002] Magnetic Resonance Imaging (MRI, Magnetic Resonance Imaging), when an external uniform magnetic field is applied, a radio frequency pulse of a specific frequency is used to excite the protons in the tissue under test, and the protons absorb a certain amount of energy to resonate. When the radio frequency pulse is stopped, The energy absorbed by the excited protons is gradually released in the form of scanning signals, which are collected and processed by image reconstruction technology to obtain a scanned image of the tissue under test, that is, an MRI image. [0003] In MR imaging technology, diffusion weighted imaging (DWI, Diffusion Weighted Imaging) technology is one of the important functional MRI imaging technologies. In DWI, the application of diffusion-weighted grad...

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Problems solved by technology

[0004] However, traditional MR imaging techniques still have shortcomings. For small targets (such as the prostate) in large imaging objects, the size of the phase field of view (Field Of View, FOV) usually far exceeds the region of interest (that is, the small target area), Moreover, the position determination of the small target area is inaccurate

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