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Gastrointestinal Imaging |
1 From the Department of Radiology, New York University Medical Center, 530 First Ave, HCC Basement-MRI, New York, NY 10016 (V.S.L., M.T.L., N.M.R., G.A.K., J.C.W.); and Siemens Medical Systems, Erlangen, Germany (G.L., D.M.T.). Received April 12, 1999; revision requested June 10; final revision received September 3; accepted September 15. Address correspondence to V.S.L. (e-mail: lee@mri.med.nyu.edu).
PURPOSE: To evaluate the feasibility, reproducibility, and technical quality of a dynamic contrast material–enhanced isotropic three-dimensional (3D) volumetric interpolated breath-hold hepatic magnetic resonance (MR) imaging examination.
MATERIALS AND METHODS: Fifty patients underwent 3D spoiled gradient-echo imaging (4.2/1.8 [repetition time msec/echo time msec]; flip angle, 12°; interpolation in three directions; intermittent fat saturation; pixel size 
2.5 mm in all dimensions) before and dynamically after administration of gadopentetate dimeglumine, with the first enhanced acquisition timed for hepatic arterial dominance by using a test bolus of contrast material. Qualitative and quantitative measures of image quality were determined. Patterns of arterial and venous anatomy were assessed. Ten patients (20%) underwent repeat imaging within 6 months, and reproducibility was evaluated.
RESULTS: Hepatic contrast-to-noise ratios for nonenhanced and arterial, portal venous, and equilibrium phase studies averaged 13.0 ± 12.6 (SD), 17.4 ± 11.8, 30.4 ± 16.2, and 28.6 ± 21.1, respectively. During arterial phase, the liver enhanced a mean of 29% of the maximal enhancement as measured during portal venous phase. Hepatic vascular anatomic variants were comparable in distribution to those cited in published articles. Repeat studies were not significantly different in image quality when compared with original studies.
CONCLUSION: High-quality arterial phase 3D volumetric interpolated breath-hold images can be obtained reliably and reproducibly when timed by using a test dose of contrast material.
Index terms: Liver, blood supply, 761.92 • Liver, MR, 761.121412, 761.121415, 761.121419, 761.12144 • Magnetic resonance (MR), pulse sequences, 761.121412, 761.121415, 761.121419, 761.12144 • Magnetic resonance (MR), technology, 761.121412, 761.121415, 761.121419, 761.12144 • Magnetic resonance (MR), three-dimensional, 761.121419 • Magnetic resonance (MR), treatment planning, 761.121412, 761.121415, 761.121419, 761.12144 • Magnetic resonance (MR), vascular studies, 761.121412, 761.121415, 761.121419, 761.12144
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