Assessment of hepatic artery anatomy in pediatric liver transplant recipients: MR angiography versus CT angiography

Abstract

During LT screening, children undergo CTA to determine hepatic artery anatomy. However, CTA imparts radiation, unlike MRA. The aim was to compare MRA to CTA in assessing hepatic artery anatomy in pediatric LT recipients. Twenty-one children (median age 8.9years) who underwent both CTA and fl3D-ce MRA before LT were retrospectively included. Interreader variability between 2 radiologists, image quality, movement artifacts, and confidence scores, were used to compare MRA to CTA. Subgroup analyses for ages <6years and ≥6years were performed. Interreader variability for MRA and CTA in children <6years was comparable (k=0.839 and k=0.757, respectively), while in children ≥6years CTA was superior to MRA (k 1.000 and k 0.000, respectively). Overall image quality and confidence scores of CTA were significantly higher compared to MRA at all ages (2.8/3 vs. 2.3/3, p=.001; and 2.9/3 vs. 2.5/3, p=.003, respectively). Movement artifacts were significantly lower in CTA compared to MRA in children ≥6years (1.0/3 vs. 1.7/3, p=.010, respectively). CTA is preferred over fl3D-ce MRA for the preoperative assessment of hepatic artery anatomy in children receiving LT, both at ages <6years and ≥6years.