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Title: SU-F-T-616: Comparison of Different Techniques Using RTOG0631 Guidelines in Spine SBRT

Abstract

Purpose: Stereotactic body radiosurgery (SBRT) for spine metastases involves irradiation using a single high dose fraction. The purpose of this study was to investigate a Hybrid VMAT/IMRT technique which combines volumetric modulated arc therapy (VMAT) and intensity modulated radiation therapy (IMRT) for spine SBRT in terms of its dosimetric quality and treatment efficiency using Radiation Therapy Oncology Group (RTOG) 0631 guidelines. Methods: 7 fields IMRT, 2 full arcs VMAT and Hybrid VMAT/IMRT were created for ten previously treated patients. The Hybrid VMAT/IMRT technique consisted of 1 full VMAT arc and 5 IMRT fields. Hybrid VMAT/IMRT plans were compared with IMRT and VMAT plans in terms of the dose distribution, spinal cord sparing, homogeneity, conformity and gradient indexies, monitor unit (MU) and beam on time (BOT). RTOG 0631 recommendations were applied for treatment planning. All plans were normalized and prescribed to deliver 18.0 Gy in a single fraction to 90% of the target volume. Results: The Hybrid VMAT/IMRT technique significantly improved target dose homogeneity and conformity compared with IMRT and VMAT techniques. Providing sharp dose gradient Hybrid VMAT/IMRT plans spare the spinal cord and healthy tissue more effectively. Although, both MU and BOT slightly increased in Hybrid VMAT/IMRT plans there ismore » no statistically meaningful difference between VMAT and Hybrid VMAT/IMRT plans. Conclusion: In IMRT, a smaller volume of healthy tissue can be irradiated in the low dose region, VMAT plans provide better target volume coverage, favorable dose gradient, conformity and better OAR sparing and also they require a much smaller number of MUs and thus a shorter treatment time than IMRT plans. Hybrid plan offers a sinergy through combination of these two techniques with slightly increased number of MU and thus more treatment time.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Ozkok Medipol University, Istanbul, Istanbul (Turkey)
Publication Date:
OSTI Identifier:
22649179
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 43; Journal Issue: 6; Other Information: (c) 2016 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; HYBRIDIZATION; PLANNING; RADIATION DOSE DISTRIBUTIONS; RADIOTHERAPY; RECOMMENDATIONS; SPINAL CORD; VERTEBRAE

Citation Formats

Acar, H, Cebe, M, Mabhouti, H, Codel, G, Pacaci, P, Serin, E, Sanli, E, Kucuk, N, Kucukmorkoc, E, Doyuran, M, Canoglu, D, Altinok, A, and Caglar, H. SU-F-T-616: Comparison of Different Techniques Using RTOG0631 Guidelines in Spine SBRT. United States: N. p., 2016. Web. doi:10.1118/1.4956801.
Acar, H, Cebe, M, Mabhouti, H, Codel, G, Pacaci, P, Serin, E, Sanli, E, Kucuk, N, Kucukmorkoc, E, Doyuran, M, Canoglu, D, Altinok, A, & Caglar, H. SU-F-T-616: Comparison of Different Techniques Using RTOG0631 Guidelines in Spine SBRT. United States. doi:10.1118/1.4956801.
Acar, H, Cebe, M, Mabhouti, H, Codel, G, Pacaci, P, Serin, E, Sanli, E, Kucuk, N, Kucukmorkoc, E, Doyuran, M, Canoglu, D, Altinok, A, and Caglar, H. Wed . "SU-F-T-616: Comparison of Different Techniques Using RTOG0631 Guidelines in Spine SBRT". United States. doi:10.1118/1.4956801.
@article{osti_22649179,
title = {SU-F-T-616: Comparison of Different Techniques Using RTOG0631 Guidelines in Spine SBRT},
author = {Acar, H and Cebe, M and Mabhouti, H and Codel, G and Pacaci, P and Serin, E and Sanli, E and Kucuk, N and Kucukmorkoc, E and Doyuran, M and Canoglu, D and Altinok, A and Caglar, H},
abstractNote = {Purpose: Stereotactic body radiosurgery (SBRT) for spine metastases involves irradiation using a single high dose fraction. The purpose of this study was to investigate a Hybrid VMAT/IMRT technique which combines volumetric modulated arc therapy (VMAT) and intensity modulated radiation therapy (IMRT) for spine SBRT in terms of its dosimetric quality and treatment efficiency using Radiation Therapy Oncology Group (RTOG) 0631 guidelines. Methods: 7 fields IMRT, 2 full arcs VMAT and Hybrid VMAT/IMRT were created for ten previously treated patients. The Hybrid VMAT/IMRT technique consisted of 1 full VMAT arc and 5 IMRT fields. Hybrid VMAT/IMRT plans were compared with IMRT and VMAT plans in terms of the dose distribution, spinal cord sparing, homogeneity, conformity and gradient indexies, monitor unit (MU) and beam on time (BOT). RTOG 0631 recommendations were applied for treatment planning. All plans were normalized and prescribed to deliver 18.0 Gy in a single fraction to 90% of the target volume. Results: The Hybrid VMAT/IMRT technique significantly improved target dose homogeneity and conformity compared with IMRT and VMAT techniques. Providing sharp dose gradient Hybrid VMAT/IMRT plans spare the spinal cord and healthy tissue more effectively. Although, both MU and BOT slightly increased in Hybrid VMAT/IMRT plans there is no statistically meaningful difference between VMAT and Hybrid VMAT/IMRT plans. Conclusion: In IMRT, a smaller volume of healthy tissue can be irradiated in the low dose region, VMAT plans provide better target volume coverage, favorable dose gradient, conformity and better OAR sparing and also they require a much smaller number of MUs and thus a shorter treatment time than IMRT plans. Hybrid plan offers a sinergy through combination of these two techniques with slightly increased number of MU and thus more treatment time.},
doi = {10.1118/1.4956801},
journal = {Medical Physics},
number = 6,
volume = 43,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}