4.7 Article

HyperArc™ Dosimetric Validation for Multiple Targets Using Ionization Chamber and RT-100 Polymer Gel

Journal

GELS
Volume 8, Issue 8, Pages -

Publisher

MDPI
DOI: 10.3390/gels8080481

Keywords

polymer gel; 3D-printed anthropomorphic phantom; HyperArc

Funding

  1. Piano di incentivi per la ricerca di Ateneo 2020/2022 (Pia.ce.ri)-Linea di Intervento 3-STARTING GRANT of the University of Catania
  2. RTsafe (RTsafe, PC, Athens, Greece)
  3. DosimETrICA

Ask authors/readers for more resources

Before performing multiple brain metastases single-isocenter stereotactic radiosurgery (SRS) treatment, it is recommended to conduct end-to-end tests. In this study, the results of the tests using ionization chamber (IC) and polymer gel were reported. The findings showed that using a single isocenter for multiple lesions can reduce treatment time without compromising accuracy.
Multiple brain metastases single-isocenter stereotactic radiosurgery (SRS) treatment is increasingly employed in radiotherapy department. Before its use in clinical routine, it is recommended to perform end-to-end tests. In this work, we report the results of five HyperArc (TM) treatment plans obtained by both ionization chamber (IC) and polymer gel. The end-to-end tests were performed using a water equivalent Mobius Verification Phantom (TM) (MVP) and a 3D-printed anthropomorphic head phantom PseudoPatient (R) (PP) (RTsafe P.C., Athens, Greece); 2D and 3D dose distributions were evaluated on the PP phantom using polymer gel (RTsafe). Gels were read by 1.5T magnetic resonance imaging (MRI). Comparison between calculated and measured distributions was performed using gamma index passing rate evaluation by different criteria (5% 2 mm, 3% 2 mm, 5% 1 mm). Mean point dose differences of 1.01% [min -0.77%-max 2.89%] and 0.23% [min 0.01%-max 2.81%] were found in MVP and PP phantoms, respectively. For each target volume, the obtained results in terms of gamma index passing rate show an agreement >95% with 5% 2 mm and 3% 2 mm criteria for both 2D and 3D distributions. The obtained results confirmed that the use of a single isocenter for multiple lesions reduces the treatment time without compromising accuracy, even in the case of target volumes that are quite distant from the isocenter.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available