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Keywords:
Kv imaging, Statistics, Radiation safety, CT, Radioprotection / Radiation dose
Authors:
D. Kluszczynski, P. Pankowski, K. Majchrzak; Lodz/PL
DOI:
10.1594/ecr2016/C-2415
Conclusion
The survey carried out in CT departments in Poland give the up-to-date snapshot of the doses obtained by patients during their CT examinations.
The returned questionnaires contained 520 values of DLP obtained during different CT examinations in Poland.
The selection of the CT examinations covers all examinations which are important for the population dose.
The annual average dose in the population (per caput) was calculated and equals 0.53 mSv.
Five examinations: head,
neck,
chest,
abdomen and pelvis share as much as 80% of the total CT dose.
The average dose calculated from mean DLP depends firmly on the distribution of the entry quantity which is DLP.
The ratio max/min calculated for DLP distribution of those 5 types of examinations varies from 7 to 20 that points out what differences in the subsequent calculations of the doses may be expected.
In a case of the individual exposure it may be crucial for the abdomen and the pelvis examinations performed with the contrast agent.
The dose obtained during CTA of chest can be meaningfull.
The max/min ratio in the DLP distribution is about 45 while the mean value of DLP equals 885 mGy∙cm,
that corresponds 15 mSv.
The presented data confirmed the fact that the exposure for the patients obtained during the CT examinations may vary dozens of times even in the homogeneous group of patients.
Some of the variability may be explained by the medical case,
but the remainder needs the optimisation.
One of the useful element in the optimisation process is the implementation and systematic review of the DRLs.
The data gathered in the survey will be used to review the DRLs in Poland.