Investigation of position linearity in position-sensitive microstrip amorphous selenium-based detector

Sahar Adnani; Abdollah Pil-Ali; Celal Con; Karim S. Karim

doi:10.1117/12.2613306

4 April 2022 Investigation of position linearity in position-sensitive microstrip amorphous selenium-based detector

Sahar Adnani, Abdollah Pil-Ali, Celal Con, Karim S. Karim

Proceedings Volume 12031, Medical Imaging 2022: Physics of Medical Imaging; 120310M (2022) https://doi.org/10.1117/12.2613306
Event: SPIE Medical Imaging, 2022, San Diego, California, United States

Abstract

A high spatial resolution and cost-effective amorphous selenium multi-layer detector architecture was previously proposed for high-energy applications including single-photon emission computed tomography (SPECT). To overcome the complexity of reading out signal from the multi-layer detector, we propose a resistive microstrip detector readout using charge division. The charge induced on the readout electrode undergoes charge division along the electrode and is proportional to the physical location of absorbed photons, enabling position sensitivity. A 1 mm collimated blue LED is employed to illuminate the electrode, which has a resistance of 242 kΩ. To improve the linearity of the position sensing, the microstrips were deposited underneath a-Se in order to move bonding pads far away from the active area. A low deposition temperature evaporated Cs-doped and As-stabilized a-Se layer is used as a hole blocking layer to ensure that the resistivity of microstrips is not affected and to prevent crystallization of the temperature sensitive a-Se layer. The detector structure was fabricated on a flexible substrate that can potentially be incorporated, in the future, into a curved detector structure for large area SPECT systems. The results presented demonstrate that the detected position is linearly proportional to the location of absorbed photons with a spatial resolution of 1 mm.

Conference Presentation

Citation Download Citation

Sahar Adnani, Abdollah Pil-Ali, Celal Con, and Karim S. Karim "Investigation of position linearity in position-sensitive microstrip amorphous selenium-based detector", Proc. SPIE 12031, Medical Imaging 2022: Physics of Medical Imaging, 120310M (4 April 2022); https://doi.org/10.1117/12.2613306

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