Keywords:
Education and training, Dosimetric comparison, Physics, Dosimetry, Computer Applications-3D, CT-Angiography, CT, Cone beam CT, Radiation physics, Lung, Cardiac
Authors:
K. Sakata1, D. Kawai1, A. Matuda1, K. Mitumoto1, T. Takakura1, K. Matsubara2, K. Koizumi1, K. Higashimura1; 1Kyoto/JP, 2Kanazawa/JP
DOI:
10.1594/ecr2013/C-1265
Purpose
[ Introduction ]
:The dosimetric calculations in CT examinations are currently based on two quantities1),2).
1.
Volume weighted CT dose Index (CTDIvol)
2.
Dose-length product (DLP)
:These quantities during each examination can be obtained from the displayed values on CT scanner console.
But the calculation methods of these quantities are different between each CT facilities.
In TOSHIBA medical system uses maximum value and mean value for calculating the CTDIvol and DLP,
respectively,
in the scan length during examination.
But the details of these methods are unclear.
:Recent CT scanners are equipped with AEC (Automatic Exposure Control) systems.
AEC systems can reduce patient dose.
Currently,
there are some software evaluating patient dose indices,
however,
CT dose software which are used widely (e.g.
ImPACT) can’t calculate patient dose indices while taking the administration of AEC into account.
[ Purpose ]
:The aim of this study was to assess the difference of dose-length product (DLP) displayed on CT console and that calculated based on measurements during chest CT examination.