Masanao Kobayashi PhD, RT, Presenter: Nothing to Disclose

Yasuki Asada PhD, Abstract Co-Author: Nothing to Disclose

Kosuke Matsubara PhD, Abstract Co-Author: Nothing to Disclose

Yuta Matsunaga RT, Abstract Co-Author: Nothing to Disclose

Ai Kawaguchi RT, Abstract Co-Author: Nothing to Disclose

Kazuhiro Katada MD, Abstract Co-Author: Consultant, Toshiba Corporation

Hiroshi Toyama, Abstract Co-Author: Nothing to Disclose

Kichiro Koshida PhD, Abstract Co-Author: Nothing to Disclose

Shouichi Suzuki PhD, Abstract Co-Author: Nothing to Disclose

Recently, attempts to develop new types of swallowing function analysis with 320-detector-row multislice CT (320-MDCT) have been reported. The present report addresses (1) patient exposure, (2) operator exposure, and (3) spatial dose distribution. For dose measurement, a human-body phantom in which 303 thermoluminescent dosimeter elements were inserted and a survey meter was used. Swallowing CT (SCT) was performed at 120kV, 10mA, 0.35sec/rot, 160mm/rot, and tilt angle of 22 (volume CT dose index displayed on the console 0.8 mGy, dose length product 12.1 mGy cm). The effective dose for the patient was 3.9 mSv. The conversion factor for obtaining the effective dose was 0.0066 mSv/mGy cm. The effective dose for the operator was 0.002 mSv. In the operator exposure measurement, the ambient dose equivalent H*(10), that would be produced by an expanded and aligned radiation field at a depth 10 mm in the International Commission on Radiation Units and Measurements sphere, was 0.012 mSv. In this report, the safety of SCT, which has become possible with the introduction of 320-MDCT, was evaluated by measurement of the exposure to the patient and operator.

Radiation protection

http://abstract.rsna.org/uploads/2014/14014312/14014312_58vr.pdf

Kobayashi, M, Asada, Y, Matsubara, K, Matsunaga, Y, Kawaguchi, A, Katada, K, Toyama, H, Koshida, K, Suzuki, S, Dose Estimation of Patient and Operator in Swallowing CT Examination Performed with a 320-detector-Row Multislice CT.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14014312.html