Proceedings of the KOSOMBE Conference (대한의용생체공학회:학술대회논문집)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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CCD-based EPID and Frame Averaging Technique

  • Kim, Ho-Kyung (Department of Nuclear Engineering, Korea Advanced Institute of Science and Technology) ;
  • Cho, Gyu-Seong (Department of Nuclear Engineering, Korea Advanced Institute of Science and Technology) ;
  • Chung, Yong-Hyun (Department of Nuclear Engineering, Korea Advanced Institute of Science and Technology) ;
  • Ahn, Seong-Kyu (Department of Nuclear Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Hyung-Koo (Department of Biomedical Engineering, Catholic University Medical College) ;
  • Kim, Hoi-Nam (Department of Radiation Oncology, Catholic University Medical College) ;
  • Yoon, Sei-Chul (Department of Radiation Oncology, Catholic University Medical College)
  • Published : 1998.11.20
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Abstract

Prototype portal imaging device (EPID) based on CCD camera, which has a $20\times20cm^2$ field of view (FOV), has been developed and then tested by acquiring phantom images for 6 MV x-ray beam. While, among the captured images, each frame suffered notorious quantum noise, the frame averaging largely enhanced the image quality against quantum noise. Over 60 frames averaging, the signal-to-noise ratio (SNR) was increased by $\sim20$ times and contrast was increased about 2 times in the skull-region of the acquired head-phantom image.

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