Radiochromic film dosimetry in synchrotron radiation breast computed tomography: a phantom study.
J Synchrotron Radiat
; 27(Pt 3): 762-771, 2020 May 01.
Article
em En
| MEDLINE
| ID: mdl-32381779
ABSTRACT
This study relates to the INFN project SYRMA-3D for inâ
vivo phase-contrast breast computed tomography using the SYRMEP synchrotron radiation beamline at the ELETTRA facility in Trieste, Italy. This peculiar imaging technique uses a novel dosimetric approach with respect to the standard clinical procedure. In this study, optimization of the acquisition procedure was evaluated in terms of dose delivered to the breast. An offline dose monitoring method was also investigated using radiochromic film dosimetry. Various irradiation geometries have been investigated for scanning the prone patient's pendant breast, simulated by a 14â
cm-diameter polymethylmethacrylate cylindrical phantom containing pieces of calibrated radiochromic film type XR-QA2. Films were inserted mid-plane in the phantom, as well as wrapped around its external surface, and irradiated at 38â
keV, with an air kerma value that would produce an estimated mean glandular dose of 5â
mGy for a 14â
cm-diameter 50% glandular breast. Axial scans were performed over a full rotation or over 180°. The results point out that a scheme adopting a stepped rotation irradiation represents the best geometry to optimize the dose distribution to the breast. The feasibility of using a piece of calibrated radiochromic film wrapped around a suitable holder around the breast to monitor the scan dose offline is demonstrated.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias da Mama
/
Tomografia Computadorizada por Raios X
/
Imagens de Fantasmas
/
Dosimetria Fotográfica
Limite:
Female
/
Humans
País/Região como assunto:
Europa
Idioma:
En
Revista:
J Synchrotron Radiat
Assunto da revista:
RADIOLOGIA
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Itália