Benefits and challenges of standard ceiling-mounted surface guided radiotherapy systems for breast treatments on Halcyon™
| Autor: | F. Josserand-Pietri, M. Khodri, N. Barbet, D. Nguyen, Jad Farah |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_specialty
Renewable Energy Sustainability and the Environment business.industry Health Toxicology and Mutagenesis medicine.medical_treatment Public Health Environmental and Occupational Health Ceiling (cloud) Torso medicine.disease Imaging phantom Radiosurgery Radiation therapy Breast cancer medicine.anatomical_structure Nuclear Energy and Engineering Match moving medicine Radiology Treatment time Safety Risk Reliability and Quality business Waste Management and Disposal |
| Zdroj: | Radioprotection. 56:295-301 |
| ISSN: | 1769-700X 0033-8451 |
| DOI: | 10.1051/radiopro/2021025 |
| Popis: | The present work investigates the benefits and challenges of applying surface guided radiation therapy (SGRT) to breast cancer treatments on the Halcyon™ (Varian, USA). Inter-fraction setup accuracy and treatment time were assessed by comparing CBCT shifts registered following SGRT-based vs. standard tattoo-based patient setup in two randomly selected groups of ten breast patients. Next, using a torso phantom and a volunteer, intra-fraction motion tracking accuracy and surface coverage were assessed for 3 adjusted central ceiling camera positions. SGRT was shown to significantly reduce setup errors (mostly within ± 2 mm) compared to tattoos (up to 2.1 cm) in all translational directions (p-value p = 0.038). Meanwhile, intra-bore surface coverage with an adjusted central SGRT camera proved insufficient, suffering from patient self-occlusions (invisible body parts occluded by patients’ own morphology such as breasts, bellies, arms, etc.) and bore-induced camera obstructions. Tracking accuracy remained satisfactory (sub-0.5 mm) but 6 degrees-of-freedom motion monitoring, critical in stereotactic radiosurgery, stereotactic body radiation therapy and deep inspiration breath hold techniques and clinical applications, was not possible. Standard ceiling-mounted SGRT systems reduce inter-fraction breast setup errors and treatment duration while intra-fraction motion tracking is insufficient for O-ring linear accelerators. |
| Databáze: | OpenAIRE |
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