Keywords:
Occupational / Environmental hazards, Education and training, Dosimetric comparison, Safety, Radiation safety, Dosimetry, CT, Radioprotection / Radiation dose, Radiation physics, Professional issues
Authors:
M. V. C. Reis1, S. Rodrigues1, A. F. Abrantes1, L. P. Ribeiro1, R. P. P. Almeida2, P. Sousa1, O. Lesyuk3; 1Faro/PT, 2Faro /PT, 3São Brás de Alportel/PT
DOI:
10.26044/ecr2019/C-1692
Conclusion
Comparing the differents results we concluded:
- An ESD reduction range from 15% to 21% was verified in all configurations with barium shields.
In a similar study,
Mourão,
Silva,
& Alonso (2013) with a bismuth shield verified a redution of 37%;
- The sequential scan presents higher values than spiral,
with or without protection,
because the eye lens is continuously irradiated,
despite the back scatter of the radiation (Batista,
2011).
- Gantry tilt (between -10° and -12°) shows higher dose reduction in the ESD on eye lens,
as shown in the study of Nikupaavo,
Kaasalainen,
Reijonen,
Ahonen,
& Kortesniemo,
(2015).
In practice,
a head CT corresponds to a effective dose of 2mSv.
In this study the dose reduction with and without the use of protection is 0.09mSv,
that equals 5 radiographs of skull PA.
These results may be used to provide more adequate procedures and to ensure that protocols are operated safely below thresholds.
Tilting the gantry to avoid the orbits and using the barium eye shielding are effective measures for reducing radiation dose to the eye lens in clinical practice.
These actions should be considered when they are consistent with the clinical task and patient anatomy.
