Effects of stereoscopic and rotational displays in a three-dimensional path-tracing task.

A series of three experiments investigated the effectiveness of stereoscopic and rotational display techniques for the purpose of establishing human factors guidelines for the design of three-dimensional (3D) displays. In the described experiments, depth perception was evaluated by examining accuracy in a 3D path-tracing task, with stimulus displays resembling the structure of cerebral angiograms. The first experiment allowed subjects to control rotation in dynamic displays.

Nuclear magnetic resonance and computed tomographic angiography in the detection of hepatic metastases.

Occasionally, routine computed tomography will fail to demonstrate substantial deposits of metastatic neoplasm in the liver. Repeating the CT scan with selective hepatic arterial infusion of contrast media may demonstrate these lesions. Nuclear magnetic resonance imaging may also provide the same information, avoiding the necessity of an invasive procedure.

Occlusion of a hepatic artery to portal vein fistula with bucrylate.

A 49-year-old woman with cirrhosis and portal hypertension was evaluated for a portal-systemic shunt procedure following recurrent variceal hemorrhage. The preoperative visceral angiogram demonstrated a hepatic arterial to portal venous fistula, presumably a complication of a previous liver biopsy. The fistula was successfully closed using isobutyl-2-cyanoacrylate (Bucrylate) delivered through a flow-directed, calibrated-leak balloon microcatheter.

The oblique bending view in oral cholecystography.

The oblique bending projection, when incorporated into routine radiographs during oral cholecystography, was found to be at least as effective as fluoroscopic spot radiographs in obtaining information about the gallbladder.