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Is helical tomotherapy accurate and safe enough for spine stereotactic body radiotherapy?

Title
Is helical tomotherapy accurate and safe enough for spine stereotactic body radiotherapy?
Authors
Yoonsun Chung;Hong In Yoon;Woong Sub Koom;Ki Chang Nam;Joo Ho Kim
Issue Date
2013
Journal Title
Journal of Cancer Research and Clinical Oncology
ISSN
0171-5216
Citation
Journal of Cancer Research and Clinical Oncology, Vol.139(2) : 243~248, 2013
Abstract
PURPOSE: We assessed the accuracy and safety of spine stereotactic body radiation therapy (SBRT) using helical tomotherapy (HT) via evaluating intrafractional patient movement. METHODS: From July 2009 to April 2011, 22 patients with spine lesions received SBRT using HT, with a total of 61 fractions. To evaluate intrafractional movement, we compared post-treatment megavoltage CT scans with planning CT images and obtained translational [lateral (X), craniocaudal (Y), anterioposterior (Z)] offsets and total displacements (R). We analyzed the correlation of intrafractional motion with patient and treatment characteristics. We also analyzed dosimetric change to the target and spinal cord, resulting from intrafractional movement, in the three patients that showed the greatest R values. RESULTS: Intrafractional movements were 0.7 ± 0.6 mm (X), 1.1 ± 0.7 mm (Y), 0.9 ± 0.6 mm (Z), and 1.8 ± 0.6 mm (R). This movement did not correlate with age, pain score, treatment time, or treatment site. Only patients with lower BMIs have a tendency to move more during treatment. Patient immobilization using wrapping form (thermoplastic mask and BodyFIX(®) system) resulted in less lateral movement and total displacement than others (0.498 ± 0.409 vs. 1.138 ± 0.637 mm, P < 0.001 for X; and 1.638 ± 0.691 vs. 1.976 ± 0.495 mm, P = 0.032 for R). However, this intrafractional motion did not affect the dose delivery to the target and spinal cord. CONCLUSION: SBRT using HT can be a safe treatment modality for spine metastasis with enhanced targeting accuracy.
URI
http://link.springer.com/article/10.1007%2Fs00432-012-1321-0

http://ir.ymlib.yonsei.ac.kr/handle/22282913/86327
DOI
10.1007/s00432-012-1321-0
Appears in Collections:
1. 연구논문 > 1. College of Medicine > Dept. of Medical Engineering
1. 연구논문 > 1. College of Medicine > Dept. of Radiation Oncology
1. 연구논문 > 1. College of Medicine > Dept. of Pharmacology
Yonsei Authors
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