Diagnostic and Interventional Radiology
Abdominal Imaging - Original Article

Relative contribution of susceptibility weighted imaging, compared to conventional MRI, in the detection of common bile-duct calculi

1.

Fortis Memorial Research Institute, Gurgaon, India

2.

Philips Innovation Campus, Philips India Limited, Bengaluru, India

Diagn Interv Radiol 2022; 28: 131-137
DOI: 10.5152/dir.2022.20713
Read: 455 Downloads: 57 Published: 01 February 2021

PURPOSE

We aimed to evaluate the relative contribution of susceptibility weighted imaging (SWI) in the detection of common bile-duct (CBD) stones in comparison to the conventional MRI protocol containing magnetic resonance cholangiopancreatography (MRCP), balanced turbo field echo (BTFE), and T2-weighted spin-echo imaging techniques.

METHODS

MRI data containing MRCP, BTFE, T2-weighted imaging, and abdominal SWI were independently evaluated by 2 sets of experienced radiologists in 44 patients with confirmed CBD stones. Endoscopic retrograde cholangiopancreatography, and endoscopic ultrasound where available, was used as the reference gold standard. Evaluation was performed for the visualization of CBD stones in each of the MRI techniques. Relative contribution of SWI was classified into one of four categories for each case: (1) no contribution to CBD stone visualization; (2) same as conventional techniques; (3) improved diagnostic confidence; and (4) critical for diagnosis. Stone size was also assessed.

RESULTS

Inter-rater agreement coefficient for CBD stone visualization was found to be “good” in MRCP (0.77), “very good” in SWI (0.94) and BTFE (0.84), and moderate in T2-weighted imaging (0.54). CBD stones were visualized with SWI in 86.4% and 82%, with MRCP in 70.5% and 70.5% cases, with BTFE in 73% and 61.4% cases, with T2-weighted imaging in 45.5% and 52.3% cases by reviewers 1 and 2, respectively. SWI did not contribute to CBD stone visualization in 2.3% (1/44); was the same as conventional techniques in 31.8% (14/44) cases; improved diagnostic confidence in 34.1%; and was critical for diagnosis in 20.5% cases.

CONCLUSION

SWI has the potential to serve as a strong adjunct to conventional MRI protocols used for CBD stone evaluation with very small scan-time penalty.

You may cite this article as: Singh V, Neelavalli J, Parvaze SP, et al. Relative contribution of susceptibility weighted imaging, compared to conventional MRI, in the detection of common bile-duct calculi. Diagn Interv Radiol. 2022;28(2):131-137.

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