Keywords:
Radioprotection / Radiation dose, Radiation physics, CT, Dosimetry, Radiation safety, Physics, Dosimetric comparison, Quality assurance
Authors:
K. YAGAMI1, T. Miyoshi1, Y. Inoue1, F. Okada1, S. Suzuki2, S. Foley3; 1Gifu/JP, 2Toyoake/JP, 3Dublin/IE
DOI:
10.26044/ecr2019/C-0863
Aims and objectives
Recently,
various imaging techniques are used by the development of the X-ray CT apparatus.
Especially,
in the area of dual energy CT using different tube voltages,
computed tomography dose index and a human equivalent body phantom are used for dose evaluation.
However,
defined dose measurement method has not been certain.
The aim of this study was to try to clarify the difference of organ doses between the fast kVp switching dual energy CT (DECT) and the single energy CT (SECT) when the displayed radiation doses (CTDIvol.) are almost the same for various scanning conditions which are suggested by the mA setting Assist system in DECT (GSI Assist) and by the automated tube current modulation techniques (ATCM) in SECT using an anthropomorphic phantom.
Moreover,
to examine whether the displayed CTDIvol. can be used for estimating outputs in the GSI Assist.
The GSI Assist uses patient size and attenuation information derived from the localizer images and suggests scanning protocol consists of DECT parameters that produce a similar CTDIvol. and planned image noise to that of the conventional SECT.