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- Title
Image quality and focal lesion detection on T2-weighted MR imaging of the liver: Comparison of two high-resolution free-breathing imaging techniques with two breath-hold imaging techniques.
- Authors
Lee, Seung Soo; Byun, Jae Ho; Hong, Hye-Suk; Park, Seong Ho; Won, Hyung Jin; Shin, Yong Moon; Lee, Moon-Gyu
- Abstract
Purpose To evaluate image quality and accuracy for the detection of focal hepatic lesions depicted on T2-weighted images obtained with two high-resolution free-breathing techniques (navigator-triggered turbo spin-echo [TSE] and respiratory-triggered TSE) and two standard-resolution breath-hold techniques (breath-hold TSE with restore pulse and half-Fourier acquisition single-shot TSE [HASTE]). Materials and Methods Our institutional review board approved this study, and written informed consent was obtained from all patients. Two readers independently reviewed 200 T2-weighted imaging sets obtained with four sequences in 50 patients. Both readers identified all focal lesions in session 1 and only solid lesions in session 2. The readers' confidence was graded using a scale of 1-4 (1 ≤ 50%; 4 ≥ 95%). The diagnostic accuracies of the four MR sequences were evaluated using the free-response receiver operating characteristic (ROC) method. Region-of-interest (ROI) measurements were performed for the mean signal intensity (SI) in the liver, spleen, hepatic lesions, and background noise. Results The accuracy of navigator-triggered TSE and respiratory-triggered TSE was superior to that of breath-hold TSE with restore pulse and HASTE for the detection of all focal or solid hepatic lesions. The mean lesion-to-liver contrast-to-noise ratio (CNR) of solid lesions in navigator-triggered ( P < 0.001) and respiratory-triggered TSE ( P < 0.005) was significantly higher than that in HASTE. Conclusion High-resolution, free-breathing, T2-weighted MRI techniques can significantly improve the detectability of focal hepatic lesions and provide higher lesion-to-liver contrast of solid lesions compared to breath-hold techniques. J. Magn. Reson. Imaging 2007. © 2007 Wiley-Liss, Inc.
- Publication
Journal of Magnetic Resonance Imaging, 2007, Vol 26, Issue 2, p323
- ISSN
1053-1807
- Publication type
Article
- DOI
10.1002/jmri.21002