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Subject

The feasibility evaluation of Respiratory Gated radiation therapy simulation according to the Respiratory Training with lung cancer
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폐암 환자의 호흡훈련에 의한 호흡동조 방사선치료계획의 유용성 평가

논문 기본 정보

Type
Academic journal
Author
Hong, mi ran (삼성서울병원방사선종양학과, 성균관대학교의과대학 삼성서울병원방사선종양학과) Kim, cheol jong (삼성서울병원방사선종양학과, 성균관대학교의과대학 삼성서울병원방사선종양학과) Park, soo yeon (삼성서울병원방사선종양학과, 성균관대학교의과대학 삼성서울병원방사선종양학과) Choi, jae won (삼성서울병원방사선종양학과, 성균관대학교의과대학 삼성서울병원방사선종양학과) Pyo, hong ryeol (삼성서울병원방사선종양학과, 성균관대학교의과대학 삼성서울병원방사선종양학과)
Journal
대한방사선치료학회 대한방사선치료학회지 대한방사선치료학회지 제28권 제2호
Published
2016.1
Pages
149 - 159 (11page)

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The feasibility evaluation of Respiratory Gated radiation therapy simulation according to the Respiratory Training with lung cancer
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Purpose : To evaluate the usefulness of the breathing exercise,we analyzed the change in the RPM signal and the diaphragm imagebefore 4D respiratory gated radiation therapy planning of lung cancer patients. Materials and Methods : The breathing training was enforced on 11 patients getting the 4D respiratory gated radiation therapy from April, 2016 until August. At the same time, RPM signal and diaphragm image was obtained respiration training total three steps in step 1 signal acquisition of free-breathing state, 2 steps respiratory signal acquisition through the guide of the respiratory signal, 3 steps, won the regular respiration signal to the description and repeat training. And then, acquired the minimum value, maximum value, average value, and a standard deviation of the inspiration and expiration in RPM signal and diaphragm image in each steps. Were normalized by the value of the step 1, to convert the 2,3 steps to the other distribution ratio (%), by evaluating the change in the interior of the respiratory motion of the patient, it was evaluated breathing exercise usefulness of each patient. Results : The mean value and the standard deviation of each step were obtained with the procedure 1 of the RPM signal and the diaphragm amplitude as a 100% reference. In the RPM signal, the amplitudes and standard deviations of four patients (36.4%, eleven) decreased by 18.1%, 27.6% on average in 3 steps, and 2 patients (18.2%, 11 people) had standard deviation, It decreased by an average of 36.5%. Meanwhile, the other four patients (36.4%, eleven) decreased by an average of only amplitude 13.1%. In Step 3, the amplitude of the diaphragm image decreased by 30% on average of 9 patients (81.8%, 11 people), and the average of 2 patients (18.2%, 11 people) increased by 7.3%. However, the amplitudes of RPM signals and diaphragm image in 3steps were reduced by 52.6% and 42.1% on average from all patients, respectively, compared to the 2 steps. Relationship between RPM signal and diaphragm image amplitude difference was consistent with patterns of movement 1, 2 and 3steps, respectively, except for No. 2 No. 10 patients. Conclusion : It is possible to induce an optimized respiratory cycle when respiratory training is done. By conducting respiratory training before treatment, it was possible to expect the effect of predicting the movement of the lung which could control the patient's respiration. Ultimately, it can be said that breathing exercises are useful because it is possible to minimize the systematic error of radiotherapy, expect more accurate treatment. In this study, it is limited to research analyzed based on data on respiratory training before treatment, and it will be necessary to verify with the actual CT plan and the data acquired during treatment in the future.

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