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Technical Review of Target Volume Delineation on the Posterior Fossa Tumor : An Optimal Head and Neck Position  

Yoon Sang Min (Department of Radiation Oncology Asan Medical Center, College of Medicine, University of Ulsan)
Lee Sang-wook (Department of Radiation Oncology Asan Medical Center, College of Medicine, University of Ulsan)
Ahn Seung Do (Department of Radiation Oncology Asan Medical Center, College of Medicine, University of Ulsan)
Kim Jong Hoon (Department of Radiation Oncology Asan Medical Center, College of Medicine, University of Ulsan)
YE Byong Yong (Department of Radiation Oncology Asan Medical Center, College of Medicine, University of Ulsan)
Ra Young Shin (Neurosurgery Asan Medical Center, College of Medicine, University of Ulsan)
Kim Tae Hyung (Fediatrics, Asan Medical Center, College of Medicine, University of Ulsan)
Choi Eun Kyung (Department of Radiation Oncology Asan Medical Center, College of Medicine, University of Ulsan)
Publication Information
Radiation Oncology Journal / v.21, no.1, 2003 , pp. 94-99 More about this Journal
Abstract
Purpose : To explore a 3D conformal radiotherapy technique for a posterior fossa boost, and the potential advantages of a prone position for such radiotherapy. Materials and Methods :A CT simulator and 3D conformal radiotherapy Planning system was used for the posterior fossa boost treatment on a 13-year-old medulloblastoma patient. He was placed In the prone position and Immobilized with an aquaplast mask and immobilization mold. CT scans were obtained of the brain from the top of the skull to the lower neck, with IV contrast enhancement. The target volume and normal structures were delineated on each slice, with treatment planning peformed using non-coplanar conformal beams. Results : The CT scans, and treatment In the prone position, were peformed successfully. In the prone position, the definition of the target volume was made easier due to the well enhanced tentorium, In audition, the posterior fossa was located anteriorly, and with the greater choice of beam arrangements, more accurate treatment planning was possible as the primary beams were not obstructed by the treatment table. Conclusion : .A posterior fossa boost, in the prone position, Is feasible in cooperating patients, but further evaluation is needed to define the optimal and most comfortable treatment positions.
Keywords
Posterior fossa; CT simulation; Conformal radiotherapy; Prone position;
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