Prog Med Phys.  2020 Dec;31(4):153-162. 10.14316/pmp.2020.31.4.153.

Dosimetric Evaluation of an Automatically Converted Radiation Therapy Plan between Radixact Machines

Affiliations
  • 1Department of Radiation Oncology, St. Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea
  • 2Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea
  • 3Department of Medical Device Engineering and Management, Yonsei University College of Medicine, Seoul, Korea

Abstract

Purpose
We aim to evaluate the accuracy and effectiveness of an automatically converted radia tion therapy plan between Radixact machines by comparing the original plan with the transferred plan.
Methods
The study involved a total of 20 patients for each randomly selected treatment site who received radiation treatment with Radixact. We set up the cheese phantom (Gammex RMI, Middleton, WI, USA) with an Exradin A1SL ion chamber (Standard Imaging, Madison, WI, USA) and GAFCHROMIC EBT3 film (International Specialty Products, Wayne, NJ, USA) inserted. We used three methods to evaluate an automatically converted radiation therapy plan using the features of the Plan transfer. First, we evaluated and compared Planning target volume (PTV) coverage (homo geneity index, HI; conformity index, CI) and organs at risk (OAR) dose statistics. Second, we com pared the absolute dose using an ion chamber. Lastly, we analyzed gamma passing rates using film.
Results
Our results showed that the difference in PTV coverage was 1.72% in HI and 0.17% in CI, and majority of the difference in OAR was within 1% across all sites. The difference (%) in absolute dose values was averaging 0.74%. In addition, the gamma passing rate was 99.64% for 3%/3 mm and 97.08% for 2%/2 mm.
Conclusions
The Plan transfer function can be reliably used in appropriate situations.

Keyword

Plan transfer; Radixact; Intensity modulated radiation therapy; Integrated Data Management System; Gamma passing rate

Figure

  • Fig. 1 Quality assurance plan setup image with cheese phantom, film, and ion chamber.

  • Fig. 2 The measured film image of (a) the original plan and (b) the transferred plan.

  • Fig. 3 Analysis image of gamma criteria (a) 3%/3 mm and (b) 2%/2 mm for prostate patients in RIT 113 (Radiological Imaging Technology, Colorado Springs, CO, USA) between the original plan and the transferred plan.

  • Fig. 4 The image of the original treatment plan of case 4 in machine B.

  • Fig. 5 The treatment plan image of case 4 converted from machine B to machine A.


Reference

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