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KMID : 1103720130690030223
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Journal of the Korean Society of Radiology
2013 Volume.69 No. 3 p.223 ~ p.234
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Triple Arterial Phase Hepatic MRI Using Four Dimensional T1-Weighted High Resolutions Imaging with Volume Excitation Keyhole Techniques: Feasibility and Initial Clinical Experience in Focal Liver Lesions
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Kim Bo-Kyu
Kim Min-Ju
Park Beom-Jin
Sung Deuk-Jae
Cho Sung-Bum
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Abstract
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Purpose: To investigate a new image acquisition method [four dimensional T1-weighted high resolution imaging with volume excitation (4D THRIVE)] which enables an accurate hepatic arterial phase definition. The feasibility and its potential for detection and characterizing focal liver lesions (FLLs) are being evaluated. Materials and Methods: 115 FLLs underwent liver MRI that included the 4D THRIVE-contrast enhanced timing robust acquisition order (CENTRA)-keyhole sequence. Triple arterial phase was obtained during a single breath-hold. Images were reviewed for image quality, lesion conspicuity, and lesion detection. Two radiologists independently assessed images from phase I, II, III and through the triple arterial phase, which were all reviewed separately and in random order. The image quality was scored by using the five-point scale, and then, one phase for lesion with greatest conspicuity was selected. The enhancement pattern for FLLs was analyzed. Results: The detection rate was the highest on phase III. The image quality was greater than grade 3 with fair inter-observer agreements. The phase III showed greater conspicuity than phase I and II. Hepatocellular carcinomas (n = 38) showed variable enhancement pattern. Metastasis (n = 14) showed rim enhancement (n = 6), homogenous (n = 3) and no enhancement (n = 5). Most hemangiomas demonstrated homogenous enhancement (6/9, 67%). Conclusion: Triple arterial MRI using the 4D THRIVE-CENTRA-keyhole technique is feasible in despite of the relatively low detection rate, and is thus, helpful for the characterization of focal liver lesions.
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KEYWORD
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Department of Radiology, Anam Hospital, Korea University College of Medicine, Seoul, Korea, Resolution Imaging with Volume Excitation, Triple Arterial Phase Hepatic MRI, Focal Liver Lesion
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