J Radiat Prot > Volume 35(2);2010 > Article
 4D-CT와 호흡동조시스템을 이용한 간암 환자의 방사선치료 표적 움직임 분석 동경래;박병수;김새싹;권대철;구은회;정운관; Target motion analysis of the respiratory gated guided radiotherapy in liver cancer patients using 4D-CT Dong, Kyung-Rae;Park, Byung-Soo;Kim, Sae-Sark;Kweon, Dae-Cheol;Goo, Eun-Hoe;Chung, Woon-Kwan; ABSTRACT The ultimate goal of radiation treatment is to use enough radiation dosage in order to examine a tumor while protecting normal tissue. Respiratory guided radiotherapy is being clinically implemented to examine a given stabilized area in order to compensate for the problems of patient breathing. This study investigates the effects of breathing movements on 40 patients with liver cancer through the actual radiation therapy plan using 4D-CT and respiratory guided radiotherapy using RPM. Using a commercial RPM respiratory gating system 4D-CT, we acquired 4D CT on multislice helical CT scanners that use different approaches to 4D CT image reconstruction. The results from analyzing forty patients according to age and direction showed no relationship between gender and transition change. The mean left-right, anteroposterior, and craniocaudal total movements were $3.19{pm}1.29$, $5.44{pm}2.07$, and $12.54{pm}4.70$ mm, respectively. Changes were the largest with CC directions and as patients advanced in age, movements were larger. Therefore, as changes occur in treatment areas because of movements caused from breathing, respiratory gating system is put into operation to revise movement and can increase the radiotherapeutics effects in treating liver cancer.
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