Keywords:
Quality assurance, Education and training, Technical aspects, Radiation safety, Dosimetry, Mammography, Radioprotection / Radiation dose, Radiographers, Professional issues
Authors:
D. C. R. Entradas1, S. Rodrigues2, R. P. P. Almeida3, L. P. Ribeiro2, A. F. Abrantes2, M. V. C. Reis2, P. Sousa2; 1Olhão/PT, 2Faro/PT, 3Faro /PT
DOI:
10.26044/ecr2019/C-1709
Methods and materials
Quantitive and experimental study,
it was divided into two phases:
- Descriptive study,
where a statistical survey of the technical parameters (kV,
mAs) was performed.
- In the second phase,
experimental simulations were carried out in order to verify the dose received on thyroid gland,
using a General Electric (GE) Senograph DMR+ mammographer with two bucky's,
one thyroid lead protection (0.5mm),
a body phantom (used only for positioning) and PMMA plates (which allowed simulating the breast tissue with a thickness of 4,5cm).
In the experimental stage a phantom of PMMA was placed,
having been applied the necessary compression.
The body phantom was placed according to the positioning quality criteria (Fig. 1).
After the correct positioning of the phantoms,
three TLD were placed in thyroid region (medial,
right lobe and left lobe) and 20 exposures were performed,
10 without protection and 10 with protection.
The measurements were made on both projections for the breast study (cranio-caudal and medio-lateral oblique).
The exposure parameters were 27 kVp and 110 mAs to the CC view,
and 27 kVp and125 mAs to the MLO view.