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Radiation Treatment Planning Evaluation by Internal Target Volume Settings

내부표적체적 설정을 통한 방사선치료계획 평가

  • 박호춘 (동신대학교 방사선학과) ;
  • 한재복 (동신대학교 방사선학과) ;
  • 최남길 (동신대학교 방사선학과)
  • Received : 2015.02.23
  • Accepted : 2015.07.03
  • Published : 2015.08.28

Abstract

The study was conducted targeting 25 patients who underwent the respiratory gated radiation therapy in the abdominal region at Radiation Oncology of a University Hospital from December 2013 to June 2014 and types of cancer included liver(64%), CBD(8%), gastric(8%), GB(8%), pancreas(8%), SMA(4%). The means of ITV and PTV volume are 471.44 cm3 and 425.48 cm3, showing an increase in volume. Normal tissue volume was also found to have increased due to the increase of the section selected from PTV section to ITV section. Right kidney showed a significant increase in differences between increase in normal tissue volume, increase in target volume and increase in therapy irradiation area and difference between the means of dose applied to normal tissue. There was no significant difference in the mean dose applied to normal tissue according to the respiratory average. Both kidneys showed a significant difference in the difference between mean doses of target moving and normal tissue. In this study, both therapy methods through PTV section and ITV section volume setting were appropriate for protection doses of normal tissue and distributed over 95% of the prescribed dose and therefore, it is considered to be okay to be optionally used depending on the patient's therapeutic purpose. But in order to minimize the unexpected side effect, the plan of PTV section and ITV section should be established and used by evaluating normal tissue protection dose.

Keywords

Respiratory Gated Radiation Therapy;Internal Target Volume;NTCP(nomal tissue complication probability)

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