Design and optimization of large area thin-film CdTe detector for radiation therapy imaging applications

Journal Article · Sun Aug 15 04:00:00 EDT 2010 · Medical Physics

DOI:https://doi.org/10.1118/1.3438082· OSTI ID:22096738

Parsai, E. Ishmael; Shvydka, Diana; Kang, Jun ^[1]

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1. Department of Radiation Oncology, University of Toledo Health Sciences Campus, 3000 Arlington Avenue, Toledo, Ohio 43614 (United States)

Purpose: The authors investigate performance of thin-film cadmium telluride (CdTe) in detecting high-energy (6 MV) x rays. The utilization of this material has become technologically feasible only in recent years due to significant development in large area photovoltaic applications. Methods: The CdTe film is combined with a metal plate, facilitating conversion of incoming photons into secondary electrons. The system modeling is based on the Monte Carlo simulations performed to determine the optimized CdTe layer thickness in combination with various converter materials. Results: The authors establish a range of optimal parameters producing the highest DQE due to energy absorption, as well as signal and noise spatial spreading. The authors also analyze the influence of the patient scatter on image formation for a set of detector configurations. The results of absorbed energy simulation are used in device operation modeling to predict the detector output signal. Finally, the authors verify modeling results experimentally for the lowest considered device thickness. Conclusions: The proposed CdTe-based large area thin-film detector has a potential of becoming an efficient low-cost electronic portal imaging device for radiation therapy applications.

• OSTI ID: 22096738
• Journal Information: Medical Physics, Journal Name: Medical Physics Journal Issue: 8 Vol. 37; ISSN 0094-2405; ISSN MPHYA6
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
62 RADIOLOGY AND NUCLEAR MEDICINE
CADMIUM TELLURIDES
CDTE SEMICONDUCTOR DETECTORS
COMPUTERIZED SIMULATION
COST
ENERGY ABSORPTION
MONTE CARLO METHOD
OPTIMIZATION
PATIENTS
PERFORMANCE
PHOTODETECTORS
PHOTONS
PHOTOVOLTAIC EFFECT
RADIOTHERAPY
SEMICONDUCTOR MATERIALS
THIN FILMS