Magnetic resonance cholangiopancreatography: comparison of respiratory-triggered three-dimensional fast-recovery fast spin-echo with parallel imaging technique and breath-hold half-Fourier two-dimensional single-shot fast spin-echo technique

Abstract

MRCP with resp 3D FR-FSE using ASSET can be routinely used for acquiring information from the pancreatobiliary system.

Evaluation of the biliary and pancreatic system with 2D SSFSE, breathhold 3D FRFSE and respiratory-triggered 3D FRFSE sequences

“…Alcuni studi in letteratura hanno già sottolineato il ruolo delle FRFSE 3D nell'imaging dell'albero biliare [16,17]. Sodickson et al [16] hanno valutato la visualizzazione dei segmenti del sistema biliare e pancreatico con sequenze times.…”

“…Sodickson et al [16] hanno valutato la visualizzazione dei segmenti del sistema biliare e pancreatico con sequenze times. In current respiratory-triggered 3D FRFSE sequences, the signal reduction associated with the use of array spatial sensitivity encoding technique (ASSET) is compensated by the application of a fast recovery pulse -a -90°flip back pulse is applied prior to the subsequent excitation-capable of bringing the magnetization vector back in the longitudinal plane with an associated increase in the SNR [17,19]. Comparison between the respiratory-triggered and breath-hold 3D sequences shows that mean visualisation scores obtained with respiratory-triggered sequences are higher than those obtained with the breath-hold technique, although the difference is not statistically significant.…”

“…During postprocessing, the biliary and pancreatic anatomy acquired in the 3D volume is analysed with MPR capable of precisely demonstrating any variants, according to dedicated reconstruction planes. It should be borne in mind that native images of 3D FRFSE sequences are particularly important in identification of possible pathological changes: MIP reconstructions, which provide a clear and immediate view of the triggerate la riduzione di segnale legata all'impiego di array spatial sensitivity encoding technique (ASSET) è compensata con l'applicazione di un impulso fast recovery, un impulso di -90°applicato alla fine del treno di echi FSE, capace di ricondurre nel piano longitudinale il vettore di magnetizzazione, con aumento del rapporto segnale/rumore [17,19].…”

“…Masui et al [17] compared 2D single-SSFSE, 2D multi-SSFSE and 3D FRFSE sequences in evaluation of the biliopancreatic system. They analysed visualisation of the first-, second-and third-order branches of the intrahepatic ducts, in addition to the pancreatic duct, the cystic duct and the extrahepatic bile duct -the latter being divided into three segments (middle, upper and lower).…”

A Study on Parallel Imaging for the Improvement of Sharpness in MRCP for Liver Transplantation

“…Later, as various parallel image techniques were introduced, Signal-toNoise Ratio (SNR) is used to obtain images in a sufficiently high magnetic field or reduce the time to obtain the images. The parallel image technique is used to reduce the scan time or improve the resolution, but an additional SNR loss may occur depending on the position of the coil arrangement [17]. In preceding research, Takayuki et al noted that by using ASSET technique in MRCP using Respiratory-Triggered 3D-Fast Relaxation Fast Spin Echo (FRFSE) MRCP can obtain more clinical information on the pancreaticobiliary as compared to 2D-Single Shot Fast Spin Echo (SSFSE) MRCP [18].…”