Unknown

Dataset Information

0

Edge area metric complexity scoring of volumetric modulated arc therapy plans.


ABSTRACT:

Background and purpose

Aperture-based complexity metrics have been suggested as a method to score complexity of volumetric modulated arc therapy (VMAT) plans. The purpose of this study was to evaluate the edge area metric (EAM) for clinical VMAT plans on a control point and treatment plan level.

Materials and methods

EAM on a control point level was evaluated based on film measurements of 18 static beam openings originating from VMAT plans. EAM on a treatment plan level (arithmetic mean value of EAM scores for control points) was evaluated based on measurements with the Delta4® for 200 VMAT plans for four different treatment sites: pelvic, thorax, head and neck, and prostate. Measurements were compared to calculations and dose difference and gamma pass rates were evaluated.

Results

EAM scores on a control point level correlated with Pearson's r-values of -0.96 and -0.77 to dose difference and gamma pass rates, respectively. The prostate plans had the highest average EAM score. A connection between smaller PTVs and higher EAM scores was found. No correlation between the evaluation result and EAM on a plan level was found.

Conclusions

EAM on a control point level was shown to correlate to the difference between measured and calculated 2D dose distributions of clinical VMAT beam openings. No correlation was found for EAM on a plan level for clinical treatment plans.

SUBMITTER: Gotstedt J 

PROVIDER: S-EPMC8058026 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC5345484 | biostudies-literature
| S-EPMC3505204 | biostudies-other
| S-EPMC4838670 | biostudies-literature
| S-EPMC4667972 | biostudies-literature
| S-EPMC3984750 | biostudies-other
| S-EPMC2967715 | biostudies-other
| S-EPMC6560241 | biostudies-literature
| S-EPMC5869893 | biostudies-literature
| S-EPMC6612702 | biostudies-literature
| S-EPMC6702773 | biostudies-literature