Cheng-Chieh Cheng1, Chun-Jung Juan2,
  Hsiao-Wen Chung, 2,3, Yee-Min Jen2, Su-Chin Chiu1,
  Hing-Chiu Chang, 1,4, Hui-Chu Chiu5,6, Cheng-Hsien Hsu2,7,
  Guo-Shu Huang2, Cheng-Yu Chen2
1Graduate Institute of Biomedical
  Electronics and Bioinformatics, National Taiwan University, Taipei, Taiwan; 2Department
  of Radiology, Tri-Service General Hospital, Taipei, Taiwan; 3Department
  of Electrical Engineering, National Taiwan University, Taipei, Taiwan; 4Applied
  Science Laboratory, GE Healthcare Taiwan, Taipei, Taiwan; 5Department
  of Nuclear Medicine, Tri-Service General Hospital, Taipei, Taiwan; 6EMBA
  in Global Chinese Management, Department of Business Administration, Tamkang
  University, Taipei, Taiwan; 7Division of Software Design, Notebook
  Unit 5, Quanta Computer Inc., Taipei, Taiwan
Parotid
  glands are highly radiosensitive, while the utilization of parotid sparing
  technique decreases the irradiation, and thus may reduce radiation therapy
  damage. In this study, we demonstrate a graded alteration in the perfusion
  characteristics of parotid glands, with the respect of parotid-sparing volume
  provided by the intensity modulated radiotherapy (IMRT) technique.
Keywords