Tamar Gaspar MD, Presenter: Nothing to Disclose

Dan Hebron MD, Abstract Co-Author: Nothing to Disclose

Nathan Peled MD, Abstract Co-Author: Nothing to Disclose

To evaluate the potential benefits of the newly released 40-slice CT scanner in CTA compared to the existing Multislice CT scanners.

: 16 patients (11 male, 5 female), mean age 60 years (range 40-84 years) underwent CTA on a newly released 40-slice CT scanner (Brilliance 40, Philips) for a variety of clinical questions. They included abdominal and thoracic aorta, Carotid arteries, Pulmonary arteries (PE studies) and arteries of the lower limbs (Runoff studies). In 4 patients we performed combined scans (aorta+PE, Carotid+PE, Carotid+Runoff) with a single bolus injection. Scan parameters included 40x0.625mm collimation; 0.67-2mm slice thickness with 0.3-1mm increment, pitch 0.9-1.3 and rotation time 0.42-0.5sec. Scan length was 192-1500 mm, scan time was 3.4-35 seconds and contrast bolus injection was 60-140 ml at 4-5 ml/sec.

There were no failed examinations. We achieved a reduction of 20% in contrast bolus injection compared to the same examinations on the 16-slice scanner due to shortening of scan time. In combined scans we managed to further reduce the bolus by 50%. We achieved pure arterial phase in longer scans compare to 16-slice scanner.

The short scan time of the newly released 40-slice CT scanner enables pure arterial phase anywhere in the body with reduced bolus injection. It allows “chasing” a single bolus in combined scans in different body fields.

Gaspar, T, Hebron, D, Peled, N, Initial Experience with 40-slice CT Scanner in CT Angiography (CTA).  Radiological Society of North America 2004 Scientific Assembly and Annual Meeting, November 28 - December 3, 2004 ,Chicago IL. http://archive.rsna.org/2004/4410715.html