Magnetic resonance imaging with respiratory gating: techniques and advantages. 2 Ehman RL, McNamara MT, Pallack M, Hricak H, Higgins CB.Respiratory ordered phase encoding (ROPE): a method for reducing respiratory motion artefacts in MR imaging. 1 Bailes DR, Gilderdale DJ, Bydder GM, Collins AG, Firmin DN.001).Ĭonclusion: T2-weighted MR imaging with the PROPELLER and PACE technique and SPIO enhancement is a promising method with which to improve the detection of hepatic lesions. The mean liver SNR and the lesion-to-liver CNR were higher with the PROPELLER technique than without it ( P <. Results: MR imaging with the PROPELLER and PACE techniques resulted in significantly improved image quality, higher sensitivity, and greater area under the ROC curve for hepatic lesion detection than did MR imaging with the PACE technique alone ( P <. The Wilcoxon signed rank test and two-tailed Student t test were used, and P <. Quantitative analysis was conducted by measuring the liver signal-to-noise ratio (SNR) and the lesion-to-liver contrast-to-noise ratio (CNR). Diagnostic performance was assessed with receiver operating characteristic (ROC) curve analysis. Three radiologists independently assessed these characteristics with a five-point confidence scale. Images were qualitatively evaluated for image artifacts, depiction of liver edge and intrahepatic vessels, overall image quality, and presence of lesions. Fat-saturated T2-weighted turbo spin-echo images were acquired with the PACE technique and with and without the PROPELLER method after administration of SPIO. Eighty-one patients (mean age, 58 years) underwent hepatic 1.5-T MR imaging. Materials and Methods: The institutional human research committee approved this prospective study, and all patients provided written informed consent. Purpose: To evaluate the effectiveness of the periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) technique for superparamagnetic iron oxide (SPIO)-enhanced T2-weighted magnetic resonance (MR) imaging with respiratory compensation with the prospective acquisition correction (PACE) technique in the detection of hepatic lesions.
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