A Phantom Study on Feasibility of Manual Field-in-Field Clinical Implementation for Total Body Irradiation and Comparison of Midplane Dose with Different Bilateral TBI Techniques.

Autor:	Pandu B; Department of Applied Physics, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, India.; Department of Radiotherapy, Bangalore Baptist Hospital, Bengaluru, Karnataka, India., Khanna D; Department of Applied Physics, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, India., Mohandass P; Department of Radiation Oncology, Fortis Hospital, Sahibzada Ajit Singh Nagar, Punjab, India., Elavarasan R; Department of Radiotherapy, Bangalore Baptist Hospital, Bengaluru, Karnataka, India., Ninan H; Department of Radiotherapy, Bangalore Baptist Hospital, Bengaluru, Karnataka, India., Vivek TR; Department of Radiation Oncology, Tawam Hospital, Abu Dhabi, UAE., Jacob S; Department of Radiotherapy, Bangalore Baptist Hospital, Bengaluru, Karnataka, India.
Jazyk:	angličtina
Zdroj:	Journal of medical physics [J Med Phys] 2023 Jan-Mar; Vol. 48 (1), pp. 59-67. Date of Electronic Publication: 2023 Apr 18.
DOI:	10.4103/jmp.jmp_103_22
Abstrakt:	Objective: The aim of this study is to implement a new treatment technique in total body irradiation (TBI) using the manual field-in-field-TBI (MFIF-TBI) technique and dosimetrically verifying its results with respect to compensator-based TBI (CB-TBI) and open field TBI technique. Materials and Methods: A rice flour phantom (RFP) was placed on TBI couch with knee bent position at 385 cm source to surface distance. Midplane depth (MPD) was calculated for skull, umbilicus, and calf regions by measuring separations. Three subfields were opened manually for different regions using the multi-leaf collimator and jaws. The treatment Monitor unit (MU) was calculated based on each subfield size. In the CB-TBI technique, Perspex was used as a compensator. Treatment MU was calculated using MPD of umbilicus region and the required compensator thickness was calculated. For open field TBI, treatment MU was calculated using MPD of umbilicus region, and the treatment was executed without placing compensator. The diodes were placed on the surface of RFP to measure the delivered dose and the results were compared. Results: The MFIF-TBI results showed that the deviation was within ± 3.0% for the different regions, except for the neck for which the deviation was 8.72%. In the CB-TBI delivery, the dose deviation was ± 3.0% for different regions in the RFP. The open field TBI results showed that the dose deviation was not within the limit ± 10.0%. Conclusion: The MFIF-TBI technique can be implemented for TBI treatment as no TPS is required, and laborious process of making a compensator can be avoided while ensuring that the dose uniformity in all the regions within the tolerance limit. Competing Interests: There are no conflicts of interest. (Copyright: © 2023 Journal of Medical Physics.)
Databáze:	MEDLINE
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