Dose Measurements using Phantoms for Tube Voltage, Tube Current, Slice Thickness in MDCT.
- Author:
Chang Lae LEE
1
;
Hee Joung KIM
;
Seong Su JEON
;
So Ra NAM
;
Hyo Min CHO
;
Ji Young JUNG
Author Information
1. Department of Radiological Science, College of Health Science and Research Institute of Health Science, Yonsei University. hjk1@yonsei.ac.kr
- Publication Type:Original Article
- Keywords:
MDCT;
Tube voltage;
Tube current;
Beam collimation;
CTDIw
- MeSH:
Head;
Humans;
Polymethyl Methacrylate
- From:Korean Journal of Medical Physics
2007;18(3):139-143
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The purpose of this study was to measure and evaluate radiation dose for MDCT parameters. Patient dose for various combination of MDCT parameters were experimentally measured, using MDCT (GE light speed plus 4 slice, USA), model 2026C electrometer (RADICAL 2026C, USA), standard Polymethylmethacrylate (PMMA) head and body CT dosimetry phantoms. In clinical situations, for a typical abdominal scan performed with MDCT at 120 kVp, 180 mAs, 20 mm collimation, and a pitch of 0.75, CTDIw, CTDIvol were measured as 20.2 mGy, 26.9 mGy, respectively. When scan length is assumed as 271.3 mm, DLP and measured effective dose of the abdominal would be calculated as 729.1 mGy cm, 10.9 mSv, respectively.
