Study of X-Rays Generated by Target in CT

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LI Quan-Feng, CHENG Cheng, YAN Hui-Yong, DU Tai-Bin and CHEN Huai-Bi. Study of X-Rays Generated by Target in CT[J]. Chinese Physics C, 2006, 30(10): 1032-1035.
LI Quan-Feng, CHENG Cheng, YAN Hui-Yong, DU Tai-Bin and CHEN Huai-Bi. Study of X-Rays Generated by Target in CT[J]. Chinese Physics C, 2006, 30(10): 1032-1035. shu
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Received: 2006-01-07
Revised: 2006-04-10
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Study of X-Rays Generated by Target in CT

    Corresponding author: LI Quan-Feng,
  • Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Abstract: The X-rays generated and transported in target bombarded by electron beams in CT have been simulated with Monte Carlo code MCNP4. Photon efficiencies and forward directional characteristics of X-rays for several kinds of often-used targets were calculated and analyzed. Calculations show that as the thickness of the target increases, the photon efficiency increases and reaches a maximum, and then drops sharply for gold and tungsten target, while drops gently for cooper target. Also, the photon efficiency for cooper target is relatively small, but the angular distribution shows good forward directional characteristics, with the dose rate in the forward direction equivalent to those of tungsten or gold target. Experiment results show that the dose rate in the forward direction of a copper target is higher than that of a tungsten target for 20MeV electrons, while the angular distribution presents better forward directional characteristics compared with a tungsten target.

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