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Modulation transfer function for a large-area amorphous silicon image receptor

J R Earnhart1, E L Chaney

  • 1Department of Radiation Oncology, UNC School of Medicine, Chapel Hill 27599-7512, USA.

Physics in Medicine and Biology
|January 22, 1998
PubMed
Summary
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This study measured the modulation transfer function (MTF) of an amorphous silicon (aSi) sensor. Results show excellent agreement between two methods, validating the detector

Area of Science:

  • Medical Physics
  • Imaging Science

Background:

  • Amorphous silicon (aSi) sensor arrays are crucial for medical imaging.
  • Accurate characterization of their performance, particularly the modulation transfer function (MTF), is essential.

Purpose of the Study:

  • To measure the presampling MTF of an aSi sensor array using edge spread function (ESF) analysis.
  • To validate measurement techniques and compare results with theoretical expectations.

Main Methods:

  • Utilized proper sampling techniques to determine the edge spread function (ESF) from a 128x128 aSi photodiode array.
  • Implemented two independent methods for calculating the presampling MTF using 40 kV X-rays.
  • Performed ESF measurements at 6 MV using a linear accelerator for system MTF calculation.

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Main Results:

  • Two distinct methods for calculating the presampling MTF showed excellent agreement.
  • The measured MTF was within 20% of the ideal MTF at the Nyquist frequency.
  • System MTF calculations incorporated source, edge block, and detector response.

Conclusions:

  • The employed methods accurately characterize the presampling MTF of aSi detectors.
  • The aSi detector performance closely aligns with theoretical predictions based on element size.
  • The study provides a robust methodology for evaluating imaging detector performance.