Fat-suppressed black blood magnetic resonance imaging method

Abstract

The present invention discloses a fat-suppressed black blood magnetic resonance imaging method. The method comprises the steps of: emitting excitation signals comprising a 90<o>x, 180<o>y and 90<o>x radio-frequency pulse impulse sequence, two same motion sensitivity gradient magnetic fields and a noise filtering gradient magnetic field, wherein one of the motion sensitivity gradient magnetic fields is loaded between the first 90<o>x pulse and the 180<o>y pulse, the other one of the motion sensitivity gradient magnetic fields is loaded between the 180<o>y pulse and the second 90<o>x pulse, thetwo motion sensitivity gradient magnetic fields are symmetrically loaded around the 180<o>y, and the noise filtering gradient magnetic field is loaded behind the 90<o>x, 180<o>y and 90<o>x radio-frequency pulse impulse sequence; setting delay after the 90<o>x, 180<o>y and 90<o>x radio-frequency pulse impulse sequence to a signal zeroing point of a fat tissue; and collecting electromagnetic wave signals. The fat-suppressed black blood magnetic resonance imaging method can reduce the sensibility for magnetic field bump so as to improve the fat suppressing effect and reduce the specific absorption rate of an MSDE (Motion-Sensitized Driven-Equilibrium) pulse sequence.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a method for suppressing black blood magnetic resonance imaging with fat. Background technique [0002] Magnetic resonance fat suppression black blood angiography has a very important application in the clinical diagnosis of some important diseases, such as carotid atherosclerotic plaque, due to its advantages of safety, non-invasiveness, high resolution, and multiple imaging angles. According to the different suppression mechanisms of blood signals, the current MRI black blood imaging methods can be divided into: 1) Black blood imaging (In-flow Saturation, IS) based on the inflow saturation effect; 2) Black blood imaging based on double inversion recovery (Double Inversion Recovery, DIR). IS technology usually cannot completely suppress the blood signal, especially for tissue blood flow with complex flow patterns. In theory, DIR technology can completely sup...

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Problems solved by technology

However, the fat saturation technology based on frequency selectivity is very sensitive to the inhomogeneity of the static magnetic field. In practical applications, due to the complexity of its geometric structure (such as the carotid artery), it is often difficult to achieve sufficient magnetic field uniformity through shimming, resulting in Fat pressing effect is not ideal

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