High-resolution three-dimensional T1-weighted hepatobiliary MR cholangiography using Gd-EOB-DTPA for assessment of biliary tree anatomy: Parallel imaging versus compressed sensing.
PURPOSE
To compare the quality of images obtained by T1-weighted hepatobiliary MR cholangiography using Gd-EOB-DTPA with 1-mm isovoxel acquisition and compressed sensing (T1-MRCCS) or parallel imaging (T1-MRCPI) for assessment of biliary tree anatomy.


METHOD
We prospectively reviewed T1-MRCCS, T1-MRCPI, and respiratory-triggered 3D T2-weighted MR cholangiography (T2-MRC) images in 58 patients. Two radiologists independently assessed the three sets of images and scored the biliary tree visualization and overall image quality in all cases using a 5-point Likert scale. The resulting scores were compared among T1-MRCCS, T1-MRCPI, and T2-MRC images using a Friedman test followed by a Scheffe test. The inter-reader agreement in scoring was assessed using κ statistics.


RESULTS
The image quality scores for the gallbladder on both T1-MRCCS and T1-MRCPI were significantly lower than those on T2-MRC (p < 0.01) for both readers. Meanwhile, the image quality scores for the right and left hepatic ducts and the anterior and posterior branches of the right hepatic duct on both T1-MRCCS and T1-MRCPI were significantly higher than those on T2-MRC (p < 0.05) for both readers. For Reader 2, the overall image quality scores on T1-MRCCS and T1-MRCPI were both significantly higher than those on T2-MRC (p < 0.05). There were no significant differences between the image quality scores on T1-MRCCS and T1-MRCPI for visualization of each bile duct (p < 0.05).


CONCLUSIONS
There may be no significant difference in quality between T1-MRCCS images and T1-MRCPI images for assessment of biliary tree anatomy, and both types of images may be better than T2-MRC images, although clinical indication is limited compared with T2-MRC.
['Suzuki|Takeshi|T|', 'Aonuma|Takanori|T|', 'Oyama|Kazuki|K|', 'Yamada|Akira|A|', 'Kitoh|Yoshihiro|Y|', 'Adachi|Yasuo|Y|', 'Hayashihara|Hayato|H|', 'Nickel|Marcel D|MD|', 'Maruyama|Katsuya|K|', 'Fujinaga|Yasunari|Y|']
D001659:Biliary Tract D002758:Cholangiography D049448:Cholangiopancreatography, Magnetic Resonance D003287:Contrast Media D019786:Gadolinium DTPA D006801:Humans D008279:Magnetic Resonance Imaging D012189:Retrospective Studies
MR cholangiography Gd-EOB-DTPA Parallel imaging Compressed sensing