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PURPOSE To determine if a correlation exists between the number of previous enhanced magnetic resonance (MR) imaging examinations and high signal intensity in the globus pallidus (GP) and dentate nucleus (DN) in patients who received gadodiamide (Omniscan), a linear nonionic gadolinium-based contrast agent, and in those who received gadobenate dimeglumine(More)
PURPOSE The purpose of this study was to develop a multi-step adaptive fitting approach for liver proton density fat fraction (PDFF) and R(2)* quantification, and to perform an initial validation on a broadly available hardware platform. THEORY AND METHODS The proposed method uses a multi-echo three-dimensional gradient echo acquisition, with initial(More)
PURPOSE To compare the inter- and intraobserver variability with manual region of interest (ROI) placement versus that with software-assisted semiautomatic lesion segmentation and histogram analysis with respect to quantitative dynamic contrast material-enhanced (DCE) MR imaging determinations of the volume transfer constant (K(trans)). MATERIALS AND(More)
Body MR imaging at 3T is in its infancy, and should improve substantially over the next several years. Radiologists need to be aware of several limitations that are based on the laws of physics: Overall, the gain in SNR at 3T will be less than twofold (without protocol alteration) compared with a standard 1.5T MR system because of the increase in T'I'1 at(More)
OBJECTIVE The purpose of this study was to determine the effects of age and fat content on quantitative dynamic contrast-enhanced MRI (DCE-MRI) parameters in the bone marrow of the lumbar spine and pelvis. The interreader reproducibility of this technique will also be assessed. MATERIALS AND METHODS Forty-three DCE-MRI studies of the female pelvis defined(More)
Magnetic resonance (MR) imaging at 3 T is clinically feasible and, in the right context, can provide improvements compared with 1.5-T MR imaging. Improvements in both signal/noise ratio and contrast/noise ratio can be used to improve image homogeneity and/or spatial and temporal resolution. Some techniques, such as brain functional MR imaging, are(More)
PURPOSE To determine whether consistent regions of activity could be observed in the lumbar spinal cord of single subjects with spin-echo functional MRI (fMRI) if several repeated experiments were performed within a single imaging session. MATERIALS AND METHODS Repeated fMRI experiments of the human lumbar spinal cord were performed at 1.5 T with a(More)
PURPOSE To determine the reproducibility of TWIST-derived (Time-Resolved Angiography with Interleaved Stochastic Trajectories) quantitative dynamic contrast enhanced (DCE) MRI in a uterine fibroid model. MATERIALS AND METHODS The institutional review board approved this retrospective study. Dynamic contrast-enhanced TWIST datasets from 15 randomly(More)
OBJECTIVE The purpose of this study was to compare triplanar 2D T2-weighted turbo spin-echo MR images with reformatted images from a 3D T2-weighted turbo spin-echo sequence in analogous planes with respect to acquisition time, image quality, artifacts, and lesion detection. MATERIALS AND METHODS Forty-four consecutively enrolled women referred for pelvic(More)
PURPOSE To test the hypothesis that there is no significant variability in apparent diffusion coefficients (ADCs) at assessment of the short- and midterm reproducibility of ADC measurements in a healthy population. MATERIALS AND METHODS Twenty healthy male volunteers were enrolled in this prospective institutional review board-approved study after they(More)