TH-EF-BRB-06: Implementation of a Modulated-Arc Total Body Irradiation (TBI) Technique Using the RayStation Treatment Planning System

2016 ◽  
Vol 43 (6Part47) ◽  
pp. 3895-3895
Author(s):  
J Phillips ◽  
J Cheung ◽  
M Held ◽  
D Han ◽  
O Morin
Keyword(s):  
Treatment Planning ◽  
Total Body Irradiation ◽  
Planning System ◽  
Treatment Planning System ◽  
Total Body

Total body irradiation: A traditional technique reconsidered in the light of treatment planning system

2016 ◽  
Vol 32 ◽  
pp. 15
Author(s):  
A. Compagnucci ◽  
F. Fabbrizzi ◽  
C. Arilli ◽  
M. Casati ◽  
L. Marrazzo ◽  
...  
Keyword(s):  
Treatment Planning ◽  
Total Body Irradiation ◽  
Planning System ◽  
Treatment Planning System ◽  
Traditional Technique ◽  
Total Body

scholarly journals Commissioning of total body irradiation using plastic bead bags

2020 ◽  
Vol 61 (6) ◽  
pp. 959-968
Author(s):  
Yuichi Akino ◽  
Shintaro Maruoka ◽  
Katsuyuki Yano ◽  
Hiroshi Abe ◽  
Fumiaki Isohashi ◽  
...  
Keyword(s):  
Total Body Irradiation ◽  
Scatter Correction ◽  
Effective Density ◽  
Planning System ◽  
Whole Body ◽  
Treatment Planning System ◽  
In Vivo Dosimetry ◽  
Total Body ◽  
Plastic Bead

Abstract The goal of total body irradiation (TBI) is to deliver a dose to the whole body with uniformity within ±10%. The purpose of this study was to establish the technique of TBI using plastic bead bags. A lifting TBI bed, Model ORP-TBI-MN, was used. The space between the patient’s body and the acrylic walls of the bed was filled with polyacetal bead bags. Patients were irradiated by a 10 MV photon beam with a source to mid-plane distance of 400 cm. The monitor unit (MU) was calculated by dose-per-MU, tissue-phantom-ratio and a spoiler factor measured in solid water using an ionization chamber. The phantom-scatter correction factor, off-center ratio and the effective density of the beads were also measured. Diode detectors were used for in vivo dosimetry (IVD). The effective density of the beads was 0.90 ± 0.09. The point doses calculated in an I’mRT phantom with and without heterogeneity material showed good agreement, with measurements within 3%. An end-to-end test was performed using a RANDO phantom. The mean ± SD (range) of the differences between the calculated and IVD-measured mid-plane doses was 1.1 ± 4.8% (−5.9 to 5.0%). The differences between the IVD-measured doses and the doses calculated with Acuros XB of the Eclipse treatment planning system (TPS) were within 5%. For two patients treated with this method, the differences between the calculated and IVD-measured doses were within ±6% when excluding the chest region. We have established the technique of TBI using plastic bead bags. The TPS may be useful to roughly estimate patient dose.

A dosimetric evaluation of a novel technique using abutted radiation fields for myeloablative total body irradiation

2020 ◽  
pp. 1-8
Author(s):  
Arun Chairmadurai ◽  
Raghul Ramiya Jayabalan ◽  
Thirumal Mani ◽  
Abhishek Gulia ◽  
Hari Mohan Agrawal ◽  
...  
Keyword(s):  
Total Body Irradiation ◽  
Treatment Time ◽  
Planning System ◽  
Whole Body ◽  
Treatment Planning System ◽  
Large Field ◽  
Medical Systems ◽  
Novel Technique ◽  
Radiation Fields ◽  
Total Body

Abstract Background: The present study reports myeloablative total body irradiation (TBI) on an isocentrically mounted linac by laying the patient on the floor and management of abutting radiation fields and partial shielding of lungs. Dosimetrical efficacy of this novel technique was evaluated. Materials and methods: In this retrospective study, dosimetrical parameters from TBI plans on whole-body CT scans of 46 patients were analysed. The prescribed dose to TBI was 12 Gy in six fractions delivered over a period of 3 days for myeloablative conditioning. TrueBeam STx platform Linac (Varian Medical Systems Inc., Palo Alto, CA, USA) was used to deliver opposing fields. Radiation fields were abutted to form a single large field using an arithmetic formula at source-to-skin-distance of 210 cm. Results: Discrepancies in dose calculated by treatment planning system were within 1·6% accuracy, and dose profile at the junction of abutting radiation fields was reproduced within 3·0% accuracy. The real treatment time for each patient was ~30 minutes/fraction. Monitor unit was weighted for multiple sub-fields to achieve dose homogeneity within 5·0% throughout the whole body, and the mean dose to lung was ≤10 Gy. Conclusion: Our abutting radiation field technique for myeloablative TBI is feasible in any existing linac bunker. ‘Island-blocking’ is feasible in this technique using multi-leaf collimator. This technique is cost-effective as it does not require any costly equipment than the readily available equipment in any radiotherapy facility. In general, TBI requires laborious planning procedures and spacious linac bunkers; this novel technique has the potential to change previously held notions.

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