A novel support system for patient immobilization and transportation for daily computed tomographic localization of target prior to radiation therapy

Kenji Nemoto, Kazumasa Seiji, Kazuya Sasaki, Nobutaka Kasamatsu, Toshie Fujishima, Yoshihiro Ogawa, Hisanori Ariga, Ken Takeda, Tokihisa Kimura, Shogo Yamada

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Purpose: To develop a method for quick and smooth transportation of patients from a computed tomography (CT) table to a linear accelerator (linac) table for confirming tumor center before radiation therapy. Methods and Materials: We developed a system using a subtable for patient immobilization that is transported via a customized stretcher. The patient lies on the subtable and is immobilized by a vacuum cushion and thermoplastic body cast. The subtable stretcher is used to carry the subtable from the CT table to the linac table. During transportation, the subtable is kept flat and shock to the subtable is carefully avoided. Between August 2001 and September 2002, a total of 9 patients with solitary upper lung tumors (superior to carina) were treated using this system. Results: Intrafractional tumor motion along the x (left-right), y (anterior-posterior), and z axis (superior-inferior) ranged from -2 mm to 2 mm, -2 mm to 2 mm, and -5 mm to 3 mm, respectively. The standard deviation of intrafractional tumor motion along the x, y, and z axis ranged from 0.5 mm to 1.5 mm, 0 mm to 1.7 mm, and 0.6 mm to 3.5 mm, respectively. Interfractional setup errors along the x, y, and z axis ranged from -5 mm to 4 mm, -6 mm to 8 mm, and -6 mm to 6 mm, respectively, and we could reduce interfractional setup errors in the majority of treatment sessions. Conclusion: We developed a system that allows patients to be immobilized and transported to verify tumor location on a daily basis. This system is highly useful for reducing setup errors.

Original languageEnglish
Pages (from-to)1102-1108
Number of pages7
JournalInternational Journal of Radiation Oncology Biology Physics
Volume55
Issue number4
DOIs
Publication statusPublished - 2003 Mar 15

Keywords

  • Computed tomography
  • Daily localization
  • Lung tumor
  • Radiotherapy

ASJC Scopus subject areas

  • Radiation
  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research

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