대한방사선치료학회:학술대회논문집
- 대한방사선치료학회 2005년도 춘계학술대회 초록집
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- Pages.13-17
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- 2005
Lung Cancer의 Stereotactic Radiosurgery시 Respiratory Gating system의 유용성에 대한 연구
Effectiveness of the Respiratory Gating System for Stereotectic Radiosurgery of Lung Cancer
- 송흥권 (서울아산병원 방사선종양학과) ;
- 김민수 (서울아산병원 방사선종양학과) ;
- 양오남 (서울아산병원 방사선종양학과) ;
- 박철수 (서울아산병원 방사선종양학과) ;
- 권경태 (서울아산병원 방사선종양학과) ;
- 김정만 (서울아산병원 방사선종양학과)
- Song Heung Kwon (Department of radiation oncology, Asan Medical Center) ;
- Kim Min Su (Department of radiation oncology, Asan Medical Center) ;
- Yang Oh Nam (Department of radiation oncology, Asan Medical Center) ;
- Park Cheol Su (Department of radiation oncology, Asan Medical Center) ;
- Kwon Kyung Tae (Department of radiation oncology, Asan Medical Center) ;
- Kim Jeong Man (Department of radiation oncology, Asan Medical Center)
- 발행 : 2005.06.01
초록
Lung cancer 환자 중 호흡에 의한 종양의 움직임이 큰 lung lower lobe에서 stetreotactic radiosurgery(SRS)시 호흡 주기 중 종양의 움직임이 적은 호흡 주기에서만 방사선을 조사하기 위해 respiratory gating system을 사용함으로써 그 유용성에 대하여 알아보고자 한다. lung lower lobe의 SRS 환자 2명을 대강으로 하였으며, 환자의 복부에 maker block(sensor)을 부착하고 tracking camera와 real time position management(RPM)를 이용하여 호흡 주기를 측정하면서 1회 호흡주기에서 10 phases의 4D-CT를 촬영 하였다. 종양의 위치 변화가 급격하지 않은 percent(
Introduction : For stereotactic radiosurgery (SRS) of a tumor in the region whose movement due to respiration is significant, like Lung lower lobe, the gated therapy, which delivers radiation dose to the selected respiratory phases when tumor motion is small, was peformed using the Respiratory gating system and its clinical effectiveness was evaluated. Methode and Materials : For two SRS patients with a tumor in Lung lower lobe, a marker block (infrared reflector) was attached on the abdomen. While patient' respiratory cycle was monitored with Real-time Position Management (RPM, Varian, USA), 4D CT was performed (10 phases per a cycle). Phases in which tumor motion did not change rapidly were decided as treatment phases. The treatment volume was contoured on the CT images for selected treatment phases using maximum intensity projection (MIP) method. In order to verify setup reproducibility and positional variation, 4D CT was repeated. Result : Gross tumor volume (GTV) showed maximum movement in superior-inferior direction. For patient