Abstract
Background
In non-contrast-enhanced magnetic resonance (MR) arteriography, the flow-out method using a selective tagging pulse with a long inversion time (TI) and a non-selective inversion recovery pulse with a short TI (the modified flow-out method) might further contribute to the suppression of background signal and facilitate improved visualization of the hepatic artery. However, no report has focused on the image quality of non-contrast-enhanced MR arteriography using the modified flow-out method.
Purpose
To compare the flow-in method with the modified flow-out method and to determine which method better visualizes the hepatic artery.
Material and Methods
Twenty-seven healthy volunteers were examined using respiratory-triggered three-dimensional true steady-state free-precession MR with two selective inversion recovery pulses (the flow-in method) or with one tagging pulse and one non-selective inversion recovery pulse (the modified flow-out method).
Results
Artery-to-liver contrast was significantly increased in the modified flow-out method relative to the flow-in method (P < 0.05). In all analyses of vessel visibility, non-contrast-enhanced MR arteriography using the modified flow-out method exhibited higher scores than with the flow-in method. With respect to overall image quality, the modified flow-out method was significantly better than the flow-in method (P < 0.01).
Conclusion
The modified flow-out method for non-contrast-enhanced MR angiography is a promising technique for visualizing the hepatic artery.
Keywords
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