Intraarterial Digital Subtraction Angiography for Evaluating Hepatic Tumors

The intraarterial digital subtraction angiography (DSA) of 52 patients with hepatic tumors was retrospectively reviewed. In 18 patients, intraarterial DSA was compared with conventional angiography. With DSA, the displacement of arteries, arterial encasement and tumor vessels were equally well identified on comparison with conventional angiography. DSA was superior to conventional angiography in demonstrating tumor stains. The diagnostic imaging capability of DSA was studied in 52 patients. In the majority of cases, DSA imaging was diagnostic for visualizing the tumors and determining their extent. The differential diagnosis of hepatic tumors was made without difficulty. Demonstration of the portal venous system was excellent using smaller quantities of contrast material and slower injection rates than by the conventional angiography. The major advantage of DSA is excellent contrast resolution and ability of the real-time information. DSA was therefore useful for evaluating hepatic tumors

Breath-hold Gadolinium-enhanced Three-dimensional MR Thoracic Aortography : Higher Spatial Resolution Imaging with Phased-Array Coil and Three-dimensional Surface Display

The aim of this study was to examine signal intensities of data sets from MR thoracic aortography and to evaluate three-dimensional surface display (3DSD) for postprocessing. Twenty-five patients were imaged with gadolinium-enhanced 3D fast gradient echo sequence. The intensity at the aortic arch was significantly higher than that at the mediastinal fat (p<0.0001). The signal-to-noise ratio was lower at the aortic arch than at the ascending and descending aorta, whereas the contrast-to-noise ratio was fairly high at the aortic arch. Although in one case (4%) the intensity at the arch was smaller than that at the mediastinal fat, 3DSD was successfully performed in all cases. Superiority of 3DSD over maximum intensity projection was obtained in 67% of the cases. 3DSD was evaluated to be superior to maximum intensity projection in all cases of thoracic aortic aneurysm and coarctation of aorta. Higher resolution MR thoracic aortography could be successfully performed with phased-array coil and 3DSD