Abstract
Magnetic resonance cholangiopancreatography (MRCP) has been widely used in clinical practice, and recently developed compressed-sensing accelerated MRCP (CS-MRCP) has shown great potential in shortening the acquisition time. The purpose of this prospective study was to evaluate the clinical feasibility and image quality of optimized breath-hold CS-MRCP (BH-CS-MRCP) and conventional navigator-triggered MRCP. Data from 124 consecutive patients with suspected pancreaticobiliary diseases were analyzed by two radiologists using a five-point Likert-type scale. Communication between a cyst and the pancreatic duct (PD) was analyzed. Signal-to-noise ratio (SNR) of the common bile duct (CBD), contrast ratio between the CBD and periductal tissue, and contrast-to-noise ratio (CNR) of the CBD and liver were measured. Optimized BH-CS-MRCP showed significantly fewer artifacts with better background suppression and overall image quality. Optimized BH-CS-MRCP demonstrated communication between a cyst and the PD better than conventional MRCP (96.7% vs. 76.7%, p = 0.048). SNR, contrast ratio, and CNR were significantly higher with optimized BH-CS-MRCP (p < 0.001). Optimized BH-CS-MRCP showed comparable or even better image quality than conventional MRCP, with improved visualization of communication between a cyst and the PD.
Highlights
Magnetic resonance cholangiopancreatography (MRCP) visualizes anatomic variations of the biliary system and various pathologies such as biliary stone disease, inflammation, and malignancy [1,2,3,4]
Analysis between a cyst and the pancreatic duct (PD) were significantly higher with optimized BH-compressed-sensing accelerated MRCP (CS-MRCP) than those with
Visualization of the common bile duct (CBD), Lt first level intrahepatic bile ducts (IHD), cystic duct, middle and distal PD, and communication, Rt (3.54 ± 1.29 between a cyst and the PD were significantly higher with optimized BH-CS-MRCP than those vs. 3.40 ± 1.34, p = 0.180) and Lt second level IHD (3.60 ± 1.15 vs. 3.81 ± 1.12, p = 0.096), and proximal with conventional MRCP (p < 0.05, Table 2)
Summary
Magnetic resonance cholangiopancreatography (MRCP) visualizes anatomic variations of the biliary system and various pathologies such as biliary stone disease, inflammation, and malignancy [1,2,3,4]. A recent study on modifications of BH-CS-MRCP that used a smaller field-of-view (FOV) with higher spatial resolution and saturation bands showed that modified BH-CS-MRCP was better than original BH-CS-MRCP and was comparable to NT-CS-MRCP in both image quality and detecting PD abnormalities [14], previous studies have been limited to a small number of patients or volunteers, and only focused on qualitative image analysis comparing conventional MRCP and CS-MRCP (whether using the respiratory triggered method or the breath-hold method), or CS-MRCP itself To our knowledge, this is the first study with a direct comparison of conventional MRCP and optimized BH-CS-MRCP with a large cohort using quantitative image analysis. The purpose of this study was to compare the images acquired with conventional MRCP and optimized BH-CS-MRCP with a smaller FOV and decreased acceleration factor, both qualitatively and quantitatively, in a large number of consecutive patients
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