iCONE‐SRS: Development of inverse treatment planning for cone‐based stereotactic radiosurgery
| Autor: | Michelle Nielsen, Anthony Lausch, Brian Nghiem |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Organs at Risk
medicine.medical_specialty medicine.medical_treatment stereotactic radiosurgery Planning target volume Radiosurgery 030218 nuclear medicine & medical imaging 03 medical and health sciences cones 0302 clinical medicine Planning study medicine Radiation Oncology Physics Humans Radiology Nuclear Medicine and imaging Medical physics Radiation treatment planning Instrumentation Retrospective Studies Inverse treatment planning Radiation Brain Neoplasms business.industry Radiotherapy Planning Computer-Assisted Intensive treatment Radiotherapy Dosage Conformity index 030220 oncology & carcinogenesis Maximum dose simulated annealing Radiotherapy Intensity-Modulated inverse planning business |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| Popis: | Purpose At present, commercially available treatment planning systems (TPS) only offer manual planning functionality for cone‐based stereotactic radiosurgery (SRS) leading to labor intensive treatment planning. Our objective was to reduce treatment planning time through development of a simple inverse TPS for cone‐based SRS. Methods The iCONE TPS was developed using MATLAB (R2015a, The MathWorks Inc.) and serves as an inverse planning adjunct to a commercially available TPS. Simulated annealing is used to determine optimal table angle, gantry start and stop angles, and cone sizes for a user‐defined number of non‐coplanar arcs relative to user‐defined dose objectives. iCONE and clinically generated plans were compared through a retrospective planning study of 60 patients treated for 1–3 brain metastases (total of 100 lesions). Results Planning target volume (PTV) coverage was enforced for all plans through normalization. PTV maximum dose was constrained to be within 120%–135% of the prescription dose. The median conformity index for iCONE plans was 1.35, 1.33, and 1.32 for 1, 2, and 3‐target cases respectively corresponding to a median increase of 0.05 (range = −0.1 to 0.5, P 0.05) relative to the clinical plans. No clinically significant differences were found with respect to the dose to organs‐at‐risk. Median iCONE planning times were approximately a factor of five lower than consensus estimates for manual planning provided by local experienced SRS planners. Conclusions A simple inverse TPS for cone‐based SRS was developed. Plan quality was found to be similar to manually generated plans; however, degradation was observed in some cases highlighting the need for continued oversight and manual adjustment by experienced planners if implemented in the clinic. A factor of five reduction in treatment planning time was estimated. |
| Databáze: | OpenAIRE |
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