放射線治療におけるターゲット動体シミュレーションを用いた追跡精度の検討  [in Japanese] Simulation study to evaluate accuracy of target tracking in external radiotherapy  [in Japanese]

Access this Article

Search this Article

Author(s)

    • 田中 利恵 TANAKA Rie
    • 金沢大学医薬保健研究域保健学系 Department of Radiological Technology, School of Health Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
    • 市川 勝弘 ICHIKAWA Katsuhiro
    • 金沢大学医薬保健研究域保健学系 Department of Radiological Technology, School of Health Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
    • 土橋 卓 DOBASHI Suguru
    • 放射線医学総合研究所 Research Center for Charged Particle Therapy, National Institute of Radiological Sciences
    • 熊谷 始紀 KUMAGAI Motoki
    • 放射線医学総合研究所 Research Center for Charged Particle Therapy, National Institute of Radiological Sciences
    • 真田 茂 SANADA Shigeru
    • 金沢大学医薬保健研究域保健学系 Department of Radiological Technology, School of Health Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University

Abstract

The purpose of this study was to address image lag in target tracking and its influence on the accuracy of target tracking. Fluoroscopic images were obtained using a direct type of dynamic flat-panel detector (FPD) . Image lag properties, modulation transfer function (MTF) , and profile curves were measured. Digital phantoms of metal sphere with and without blurred edge due to image lag were simulated using the results, respectively, and then superimposed on breathing chest radiographs of a patient. The moving target with and without image lag was traced using a template-matching technique. In the results, the image lag for the first frame after X-ray cutoff was 2.0% and decreased to less than 0.1% in the fifth frame. In the measurement of profile curves on the edges of tungsten material plates, the effect of image lag was seen as blurred edges of the plate. The blurred edges of the plate were also indicated as reduction of MTF. However, the target could be traced without tracking error. The results indicated that there was no effect of image lag on target tracking in usual breathing speed in a radiotherapy situation.

Journal

  • Medical Imaging and Information Sciences

    Medical Imaging and Information Sciences 27(2), 33-37, 2010

    MEDICAL IMAGING AND INFORMATION SCIENCES

Codes

  • NII Article ID (NAID)
    130000262792
  • NII NACSIS-CAT ID (NCID)
    AN10156808
  • Text Lang
    JPN
  • Article Type
    journal article
  • ISSN
    0910-1543
  • Data Source
    IR  J-STAGE 
Page Top