Rapid auto-navigation magnetic resonance hydrography imaging method and device

Abstract

The invention discloses a rapid auto-navigation magnetic resonance hydrography imaging method and device. Clinical application models of the invention include a breath-holding navigation mode and a free breath navigation mode. Adult patients with good breath control ability can adopt the breath-holding navigation mode, and infant patients with poor breath control ability can adopt the free breath navigation mode. The method and the device can obviously improve the acquisition efficiency, the control accuracy and the signal to noise ratio of magnetic resonance signals, can avoid an interference effect between an imaging sequence and a navigation wave sequence, and can enhance respiratory movement artifact inhibition effect; and the method and the device is simple in clinic operation, can obviously decrease coordination difficulties of patients, is conductive to clinical application of the magnetic resonance hydrography imaging technique, and can achieve unique diagnosis determining value in clinical diagnosis of a biliary system and a urinary system.

Description

technical field [0001] The invention relates to the technical field of medical magnetic resonance abdominal and pelvic imaging, in particular to a fast self-navigating magnetic resonance water imaging method and device. Background technique [0002] Various abdominal magnetic resonance imaging techniques have important clinical diagnostic value due to the advantages of high soft tissue resolution, multi-directional scanning methods, and no ionizing radiation hazards. Its own liquid is used as a natural contrast agent to enhance the contrast of tissues and organs without any trauma and side effects, and can perform three-dimensional multi-plane image reconstruction or maximum intensity projection, providing a unique method for the diagnosis of biliary tract obstruction, urinary tract obstruction and other diseases. Imaging means. In contrast, percutaneous transhepatic cholangiography (PTC) and endoscopic retrograde cholangiopancreatography (ERCP) are invasive techniques, US ...

AI Technical Summary

Problems solved by technology

However, the drift of the diaphragm position in the fixed-width acquisition window often reduces the navigation accuracy, and the mutual interference between the navigation RF pulse and the imaging RF pulse is easy to occur, so that the respiratory motion curve sometimes has abnormal measurement errors or banding in the imaging layer Saturation artifacts, especially the monitoring of respiratory plateau by one-dimensional amplitude navigation waves, are also prone to interference from surrounding fat hyperintensities, blood flow enhancement effects, and signal folding

In order to overcome the shortcomings of the above-mentioned amplitude navigation technology, a respiratory gating imaging technology based on the navigation wave phase has recently been initially applied in clinical research on imported superconducting magnetic resonance imaging equipment. It is not sensitive to the interference effect between them, but it still adopts the single-echo navigation method and the fixed-width acquisition window, which limits the further improvement of navigation accuracy and time resolution.

On the other hand, respiratory navigation wave imaging technology has been applied in abdominal imaging on domestic magnetic resonance imaging equipment. At present, the most clinical application is mainly the one-dimensional retrospective amplitude navigation mode, and the k-space data needs to be collected repeatedly. Refilling k-space by picking k-space lines through a fixed-width acquisition window to reduce ringing and breathing artifacts, excessive scan and data processing times

Images