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Free-breathing Three-dimensional MR Cholangiopancreatography Using Centric k-space Encoding Improved Gallbladder
Junya Tsuzaki1, Taiki Nozaki1,2, Daiki Ito3,4
1Department of Radiology, Keio University School of Medicine, Tokyo, Japan.
Summary
MRCP-CORE, a new free-breathing MRI technique, significantly improves gallbladder visualization compared to conventional MRCP. This novel method offers a robust alternative to breath-hold techniques for enhanced diagnostic imaging.
Area of Science:
- Radiology and Medical Imaging
- Gastroenterology
- Biomedical Engineering
Background:
- Magnetic Resonance Cholangiopancreatography (MRCP) can be limited by signal loss due to concentrated bile.
- Gradient-and-spin-echo (GRASE) MRCP improves signal but requires breath-holding.
- Developing free-breathing MRCP techniques is crucial for patient comfort and image quality.
Purpose of the Study:
- To develop and evaluate MRCP with centric order encoding (MRCP-CORE), a novel free-breathing sequence.
- To assess MRCP-CORE's ability to visualize the gallbladder compared to conventional and GRASE MRCP.
- To investigate the impact of bile concentration on gallbladder visibility across different MRCP sequences.
Main Methods:
- Prospective study of 100 patients undergoing three MRCP sequences (MRCP-CORE, conventional MRCP, GRASE MRCP) on a 3T system.
- Independent radiologist assessment of anatomical structure visibility, artifacts, and overall image quality.
- Quantitative measurement of SNR, contrast-to-noise ratio, and contrast ratio; statistical analysis using Friedman and Jonckheere-Terpstra tests.
Main Results:
- MRCP-CORE demonstrated significantly higher Signal-to-Noise Ratio (SNR) compared to conventional and GRASE MRCP (20.9 vs. 17.3 vs. 15.8; P < 0.001).
- Gallbladder visibility was significantly improved with MRCP-CORE versus conventional MRCP (P = 0.02), comparable to GRASE MRCP (P = 1.00).
- Bile concentration impacted gallbladder visibility in conventional MRCP (P < 0.001) but not in MRCP-CORE (P = 0.12) or GRASE MRCP (P = 0.43).
Conclusions:
- MRCP-CORE enhances gallbladder depiction compared to conventional MRCP.
- MRCP-CORE provides a robust free-breathing alternative to breath-hold GRASE MRCP.
- The novel sequence overcomes limitations associated with bile concentration in MRCP.
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