Proceedings of the Korean Society of Medical Physics Conference (한국의학물리학회:학술대회논문집)

Korean Society of Medical Physics (한국의학물리학회)
권호 표지

Multi-Channel Data Acquisition System Design for Spiral CT Application

  • Yoo, Sun-Won (Dept. of Electronic and Information of Korea University) ;
  • Kim, In-Su (Dept. of Electronic and Information of Korea University) ;
  • Kim, Bong-Su (Dept. of Electronic and Information of Korea University) ;
  • Yun Yi (Dept. of Electronic and Information of Korea University) ;
  • Kwak, Sung-Woo (Dept. of Nuclear Engineering, Korea Advanced Institute of Science and Technology) ;
  • Cho, Kyu-Sung (Dept. of Nuclear Engineering, Korea Advanced Institute of Science and Technology) ;
  • Park, Jung-Byung (Listem Corp.)
  • Published : 2002.09.01
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Abstract

We have designed X-ray detection system and multi-channel data acquisition system for Spiral CT application. X-ray detection system consists of scintillator and photodiode. Scintillator converts X-ray into visible light. Photodiode converts visible light into electrical signal. The multi-channel data acquisition system consists of analog, digital, master and backplane board. Analog board detects electrical signal and amplifies signal by 140dB. Digital board consists of MUX(Multiplex) which routes multi-channel analog signal to preamplifier, and ADC(Analog to Digital Converter) which converts analog signal into digital signal. Master board supplies the synchronized clock and transmits the digital data to image reconstructor. Backplane provides electrical power, analog output and clock signal. The system converts the projected X-ray signal over the detector array with large gain, samples the data in each channel sequentially, and the sampled data are transmitted to host computer in a given time frame. To meet the timing limitation, this system is very flexible since it is implemented by FPGA(Field Programmable Gate Array). This system must have a high-speed operation with low noise and high SNR(signal to noise ratio), wide dynamic range to get a high resolution image.

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