A surface-conforming flexible collimator for improving electron radiotherapy.

Clinical Snapshot

Key Findings

• P Value: Not reported - descriptive study

• Effect Size: Maximum improvement: 18.7mm to 1.4mm penumbra (92.5% reduction at 6 MeV, 110cm SSD)

• Primary Outcome: Penumbral width reduction across all tested conditions

• Nnt Or Sensitivity: Packing fraction: 0.551 ± 0.016 (characterizes device performance)

• Confidence Interval: Not reported for primary outcomes

Clinical Application

Prototype demonstrates proof-of-concept but requires engineering development for clinical implementation Relevant to Australian radiation oncology departments using electron therapy; would require TGA approval as medical device before clinical use Patients requiring electron beam radiotherapy, particularly superficial treatments requiring precise field definition

Abstract

Objective.We aim to simplify the traditional method of patient-specific skin collimation and to improve the precision of electron radiotherapy treatment with a new surface-conforming collimation system.Method.A surface-conforming collimation device for electron radiotherapy, consisting of parallel steel cables, was created. The cables move freely relative to each other and can be fixed and reshaped with a clamp system along the length of the device. The cables do not completely fill the space; thus, their packing fraction was determined to characterize dosimetric effects. The cable collimator was tested with a 10 × 10 cm cone with four electron energies (6, 9, 12, and 15 MeV) at three SSDs (100 cm, 105 cm, and 110 cm). Radiochromic film was placed at the surface and at the maximum dose depth (dmax) for each energy. Penumbral width, defined as the distance between 20% and 80% of the maximum dose, was measured for each energy and depth.Results.The largest improvement with respect to traditional collimation was seen for 6 MeV with 110 cm SSD at the surface. The penumbra at the surface for the conventional collimator in this case was 18.7 mm, while the cable collimator penumbra was 1.4 mm. The smallest improvement was seen for 15 MeV with 100 cm SSD atdmax(2.7 cm), where the penumbra for the traditional collimator was 11.1 mm, while the cable collimator penumbra was 9.8 mm. In all cases, the cable collimator reduced penumbral width. Surface dose inhomogeneities due to scatter were most pronounced at higher energies. The packing fraction was measured to be 0.551 ± 0.016.Significance.The prototype shows significant improvement in penumbra compared to conventional collimation. The system aims to serve as a replacement for current skin collimation techniques and could be used with Cerrobend applicators for additional surface blocking.

References

1. 1.New, P., Parker, K., Paschal, H., Holly, B., Bassiri, N., Nema, K., Rasmussen, K., Papanikolaou, N., & Kirby, N. (2026). A surface-conforming flexible collimator for improving electron radiotherapy. Physics in Medicine and Biology. https://doi.org/10.1088/1361-6560/ae59e9