Keywords:
Dosimetry, CT, Radioprotection / Radiation dose, Radiation physics, Paediatric, Dosimetric comparison
Authors:
A. Ploussi1, V. G. Syrgiamiotis2, T. Makri1, G. A. T. Messaris3, C. Hatzigiorgi1, E. Efstathopoulos1; 1Athens/GR, 2GOUDI/GR, 3Patras/GR
DOI:
10.26044/ecr2019/C-1214
Results
In the cohort participated 507 male (60%) and 344 (40%) female pediatric patients.
57% (481/851) of examinations were of head,
25% (213/851) of chest,
7% (62/851) of AP,
6% (51/851) of IAC and 5% (44/851) of neck.
Two-phase CT scans were performed in approximately 22% of children.
Overall,
across all age groups,
DRLs ranges for CTDIvol were (23-68),
(9-21),
(37-44),
(2-4),
(2-3) mGy; for DLP per acquisition (370-705),
(150-427),
(235-273),
(40-132),
(70-132) mGy*cm and for total DLP (451-825),
(259-536),
(273-398),
51-150),
(146-238) mGy*cm for head,
neck,
IAC,
chest and AP CT examinations,
respectively.
Figures 1-3 present the derived age-based DRLs in terms of the 75th percentile of 1) CTDIvol,
2) DLP per acquisition and 3) total DLP,
for the five types of CT examinations.
According to European Guidelines on DRLs for Pediatric Imaging [2],
at least 10 patients per type of CT examination per age group are needed to determine DRLs.
Therefore,
DRLs for smaller sample size are not presented (neck and IAC examinations 0-18 months age group,
see Table 1).