ARRS 2022 Abstracts

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E1745. Increasing the Ability for Lesion Detection With Double Arterial Phase Acquisition in Gadoxetate-Disodium-Enhanced Magnetic Resonance Images
Authors
  1. Po-Ting Lin; Taipei Veterans General Hospital
  2. Rheun-Chuan Lee; Taipei Veterans General Hospital
Objective:
The objective of this study was to determine if the ability of lesion detection for hepatic lesions increases by means of double arterial phase acquisition in patients underwent gadoxetate disodium-enhanced abdominal MRI.

Materials and Methods:
We retrospectively reviewed a total of 181 MRI examinations with gadoxetate disodium enhancement performed from November 2019 to November 2020. All MRI examinations were divided into two groups according to the number of arterial phase acquisition, single or double. The degree of motion artifact of each arterial phase was rated on a scale of 1 (no motion) to 5 (nondiagnostic images) in comparison with delayed-phase images acquired 30 minutes after gadoxetate disodium injection. The adequacy of the hepatic arterial phase was evaluated as well. In total, 115 MRI examinations with hepatic lesion(s) were included. MR images without motion artifact (scored less than 3) and with adequate hepatic arterial phase acquisition were defined as adequate images for lesion detection. The number of studies without motion artifact and with adequate arterial phase were compared with chi-square or Fisher exact test.

Results:
The scale of motion artifact and the adequacy of arterial phase acquisition between the two groups showed no significant difference (p = 0.43 and p = 0.13, respectively). In the group with double arterial phase acquisition, 35 of 38 (92.1%) studies were adequate for lesion detection. In comparison, 43 of 77 (55.8%) studies were adequate for lesion detection in the group with single arterial phase acquisition. The number of adequate images for lesion detection was significantly higher in the group with double arterial phase acquisition (p < 0.0001).

Conclusion:
With one more arterial phase acquisition in abdominal MRI with gadoxetate disodium enhancement, the ability for lesion detection may be elevated to conquer the effect of transient severe motion and suboptimal arterial phase acquisition.