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- W2026705571 abstract "Purpose: The commercially available EPIDs today commonly manufactured from amorphous‐Silicone (a‐Si) materials display numerous problems in image contrast & resolution. These are related to poor radiation hardness and low Z which is detrimental to their detecting capabilities. The CdTe‐based thin film devices with superior radiation hardness and much higher Z (∼50) have not yet found many applications in medical physics. Here we report first promising results on polycrystalline thin film CdTe‐based prototype EPID. Method and Materials: The proposed design utilizes a layer of high atomic number and density functioning as a converter transforming high energy X‐rays into the Compton electrons impeding onto CdTe detector operating in pulse mode. Such a converter can replace the standard scintillators used with a‐Si devices. We conducted Monte Carlo simulations testing the proposed structure and verified them with measurements using a prototype thin film CdTe cells. Our modeling was amplified with a semi‐empirical algorithm accounting for the processes of device degradation, simultaneously applied to the a‐Si devices for comparative study. Results: We found that a layer of Pb less than 3 mm thick in combination with low‐Z material such as polystyrene, used for filtering out low‐energy scatter, is suitable for the converter. Detector output voltage in the range of the tenths of Volt for the typical radiation therapy dose rates allowed for a possibility of using the device without biasing. We have carried out verifying experiments with polycrystalline CdTe based cells: good agreement with our MC simulations was obtained. Conclusion: CdTe based thin film detectors have a high potential to become the next generation EPID's. They feature: small thickness <10 μm; efficient collection; exceptional radiation hardness; inexpensive deposition technology; sensitivity to low intensity radiation; excellent room temperature characteristics without biasing; small integration time < 500 ns." @default.
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- W2026705571 date "2007-06-01" @default.
- W2026705571 modified "2023-10-16" @default.
- W2026705571 title "TH-C-M100E-03: A New Generation of Electronic Portal Imaging Devices (EPID) Using Thin-Film CdTe for Radiation Oncology Applications" @default.
- W2026705571 doi "https://doi.org/10.1118/1.2761671" @default.
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