Congress:
EuroSafe Imaging 2019
Keywords:
Action 7 - Radiation protection of children, Action 2 - Clinical diagnostic reference levels (DRLs), Paediatric, CT, Physics, Dosimetry, Dosimetric comparison
Authors:
D. Yanikian Nersissian, H. Leao Filho, C. S. Melo, V. Heidorne Guerra, R. Gonçalves Freitas, M. V. Y. Sawamura, E. M. M. S. GEBRIM, P. R. Costa
DOI:
10.26044/esi2019/ESI-0038
Conclusion and recommendations
The first results have presented the dose reductions without perceptive loss in image quality of these two general exams.
Just for Head and Neck exam was observed a degradation in the detail structures by the responsible radiologist.
The medical physicist contacted the radiographer to made the necessary changes in this protocol.
A preliminary global view of the effects of the optimization process is shown in Figure 3 and 4 for head and thorax CT,
respectively,
showing the comparative results for CTDIvol quantity for each age group.
Considering the 3rd quartil as a dose reference level,
a reduction of 50 % in the CTDIvol was reached for patients of 5 – 16 year and for the youngest group (0 – 5 years) the reduction was 66 % for head exams.
For thorax,
the most expressive dose saving was for the 1 – 5 years group of 47%.
Figure 3 - omparative results of the optimized and non-optimizes CTDI resulting for the studied image groups for Brain CT.
Figure 4 - Comparative results of the optimized and non-optimizes CTDI resulting for the studied image groups for Chest CT.