Due to the features of modern radiotherapy techniques, namely Intensity Modulated Radiation Therapy (IMRT) and Stereotactic Treatments with photon fields, where high spatial dose gradient are often present, detectors to be employed for two-dimensional (2D) dose verifications have to satisfy very narrow requirements. In particular, they have to exhibit high spatial resolution. In the framework of the European Integrated Project MAESTRO, a dosimetric detector adequate for 2D pre-treatment dose verifications was developed. It is a modular detector based on a monolithic silicon segmented sensor, with a n-type implantation on an epitaxial p-type layer. The sensor is composed of 21×21 pixels with 2×2 mm2 area and 3 mm center-to-center distance. In this paper we report the first preclinical dosimetric characterization of the detector. The sensor was irradiated with 6, 10, 25 MV photon beams from a linear accelerator (LINAC). The studied parameters were repeatability of a single channel, reproducibility between different matrix elements, response linearity vs. absorbed dose and dose rate dependence of sensitivity. Some preliminary tests on energy dependence were also performed. The obtained results are promising since almost all the channels have performances within the project specifications (repeatability <0.5%, reproducibility <1%, deviation from linearity <1%, dose rate dependence <1%).

Preliminary dosimetric characterization of a silicon segmented detector for 2D dose verifications in radiotherapy / C. TALAMONTI; M. BRUZZI; M. BUCCIOLINI; L. MARRAZZO; D. MENICHELLI. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - STAMPA. - 583:(2007), pp. 114-118. [10.1016/j.nima.2007.08.225]

Preliminary dosimetric characterization of a silicon segmented detector for 2D dose verifications in radiotherapy

TALAMONTI, CINZIA
Writing – Original Draft Preparation
;
BRUZZI, MARA
Supervision
;
BUCCIOLINI, MARTA
Supervision
;
MARRAZZO, LIVIA
Membro del Collaboration Group
;
MENICHELLI, DAVID
Investigation
2007

Abstract

Due to the features of modern radiotherapy techniques, namely Intensity Modulated Radiation Therapy (IMRT) and Stereotactic Treatments with photon fields, where high spatial dose gradient are often present, detectors to be employed for two-dimensional (2D) dose verifications have to satisfy very narrow requirements. In particular, they have to exhibit high spatial resolution. In the framework of the European Integrated Project MAESTRO, a dosimetric detector adequate for 2D pre-treatment dose verifications was developed. It is a modular detector based on a monolithic silicon segmented sensor, with a n-type implantation on an epitaxial p-type layer. The sensor is composed of 21×21 pixels with 2×2 mm2 area and 3 mm center-to-center distance. In this paper we report the first preclinical dosimetric characterization of the detector. The sensor was irradiated with 6, 10, 25 MV photon beams from a linear accelerator (LINAC). The studied parameters were repeatability of a single channel, reproducibility between different matrix elements, response linearity vs. absorbed dose and dose rate dependence of sensitivity. Some preliminary tests on energy dependence were also performed. The obtained results are promising since almost all the channels have performances within the project specifications (repeatability <0.5%, reproducibility <1%, deviation from linearity <1%, dose rate dependence <1%).
2007
583
114
118
Goal 3: Good health and well-being for people
C. TALAMONTI; M. BRUZZI; M. BUCCIOLINI; L. MARRAZZO; D. MENICHELLI
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/200286
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