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KMID : 1164220140260010051
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Journal of Korean Society for Radiotherapeutic Technology
2014 Volume.26 No. 1 p.51 ~ p.57
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Studies on changes in bulks of body per dose and in the positioning of duodenum by respiration when treating pancreatic cancer patients with radiation therapy
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Jang Hyeong-Jun
Chun Keum-Sung
Park Yeong-Gyu
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Abstract
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Purpose : In the case of treating pancreatic cancer, the importance is put on the spread of dose. Changes take place in
duodenum in accordance with respiration. Thus, in this paper, I am going to trace the positioning of duodenum and the
changes in bulks of body per dose by scanning the patients’Kilovoltage Cone-Beam CT using the hospital equipped CT-on rail System.
Materials and Methods : Seeing three patients, I have acquired KVCBCT by using CT-on rail System and spotted the change in positioning at duodenum after comparing with the preliminary image of treatment plan by using SYNGO Software. Then, I followed the change in the bulk of duodenum and analyzed the changes in bulks of body on the same dose by transmitting the acquired KVCBCT into Pinnacle, a treatment plan system.
Results : The changes in the positioning shall be as set forth like this: 1.2cm, 1.0cm in Left-Right Direction, 0cm, 0.8cm in
Craniocaudal Direction, 0.1cm, and 1.0cm in Anterior-Posterior Direction. Patient number one showed that his bulks in body had increased by maximum 460%, minimum 120%, the bulks in patient number two had increased bymaximum 490%, minimum 160%, and the bulks of patient number three had increased by maximum 150%. But Minimum volume decreased 30%. Patient number one showed only a little bit of change at first when compared with the preliminary treatment plan. However, the dose increased the bulks in the patient’s body: V10 118%, V20 117%, V30 400%, and V40 480%
Conclusion : In treating patients with radiation therapy using 3D-CRT, the dose amount penetrated into duodenum needs to
be minimized by planning appropriate treatment beforehand. In order to establish an appropriate treatment plan it is equired to comprehend the changes at positioning of the duodenum by respiration and predict the changes in the bulks of duodenum by setting precise Planning Target Volume.
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KEYWORD
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CT On-rail system, Panceratic cancer, Duodenum, 4D-CT
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