1. Radiochromic film dosimetry in synchrotron radiation breast computed tomography: a phantom study
- Author
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Marica Masi, Pasquale Delogu, Fulvia Arfelli, Antonio Sarno, Christian Fedon, Luigi Rigon, Angelo Taibi, Giovanni Mettivier, Bruno Golosio, Paolo Russo, Luca Brombal, Piernicola Oliva, Francesca Di Lillo, Sandro Donato, Mettivier, Giovanni, Masi, Marica, Arfelli, Fulvia, Brombal, Luca, Delogu, Pasquale, Di Lillo, Francesca, Donato, Sandro, Fedon, Christian, Golosio, Bruno, Oliva, Piernicola, Rigon, Luigi, Sarno, Antonio, Taibi, Angelo, Russo, Paolo, Mettivier, G., Masi, M., Arfelli, F., Brombal, L., Delogu, P., Di Lillo, F., Donato, S., Fedon, C., Golosio, B., Oliva, P., Rigon, L., Sarno, A., Taibi, A., and Russo, P.
- Subjects
Nuclear and High Energy Physics ,Film Dosimetry ,Materials science ,Synchrotron radiation ,Socio-culturale ,Breast Neoplasms ,Computed tomography ,Radiation Dosage ,Rotation ,Radiochromic dosimetry ,Imaging phantom ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,Kerma ,0302 clinical medicine ,medicine ,Humans ,Dosimetry ,Irradiation ,Instrumentation ,Radiation ,medicine.diagnostic_test ,Phantoms, Imaging ,synchrotron radiation ,breast computed tomography ,radiochromic dosimetry ,Research Papers ,Breast computed tomography ,Italy ,Beamline ,030220 oncology & carcinogenesis ,Female ,Tomography, X-Ray Computed ,Breast computed tomography, Radiochromic dosimetry, Synchrotron radiation ,Synchrotrons ,Biomedical engineering - Abstract
This study relates to the INFN project SYRMA-3D for in 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 14 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 38 keV, with an air kerma value that would produce an estimated mean glandular dose of 5 mGy for a 14 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.
- Published
- 2020