Renal vasculature in potential renal transplant donors: comparison of MR imaging and digital subtraction angiography.

Purpose: To compare magnetic resonance (MR) angiography with a selective inversion-recovery sequence and digital subtraction angiography (DSA) in renal transplant donors.

Materials And Methods: Thirteen potential donors underwent MR imaging at 1.5 T and conventional angiography.

Dynamic contrast-enhanced subtraction MR angiography of the lower extremities: initial evaluation with a multisection two-dimensional time-of-flight sequence.

Purpose: To determine the clinical feasibility of a contrast material--enhanced two-dimensional (2D) magnetic resonance (MR) angiographic sequence in lower extremity arteries.

Materials And Methods: Four healthy volunteers and 12 patients underwent dynamic contrast-enhanced MR angiography; all patients also underwent conventional angiography. A 2D multisection gradient-echo sequence with image subtraction was used for all MR imaging examinations.

Transitional cell carcinoma of the upper urinary tract: staging by MRI.

Background: This study evaluates the ability of MRI to stage transitional cell carcinoma of the upper urinary tract.

Methods: Nine patients who had transitional cell carcinoma of the upper urinary tract detected by other imaging modalities underwent MRI examination at 1.5 T.

Breath-hold 3D STAR MR angiography of the renal arteries using segmented echo planar imaging.

Three-dimensional (3D), cardiac triggered renal MR angiograms were acquired with excellent background suppression within a single breath-hold of 18 to 30 s using signal targeting with alternating radiofrequency (STAR), a subtraction time-of-flight MR angiography technique, and a 3D scheme combining echo planar imaging (EPI) readouts and k-space segmentation. The 3D STAR sequence was evaluated on 17 healthy individuals, 3 potential renal donors, and 2 patients with suspected renovascular hypertension. An inversion tag through the aorta was applied to produce the vascular contrast.

Magnetic resonance imaging in rheumatology. An overview.

Magnetic resonance (MR) imaging has revolutionized the assessment of pathology involving the musculoskeletal system. The soft tissue contrast, superb resolution, multiplanar acquisition potential, and the ability to monitor physiologic processes combine the best features of other imaging modalities. The sensitivity and specificity of MR imaging for a wide range of disease processes matches or supersedes conventional radiology, nuclear medicine, and clinical examination.