Surface scanning for 3D dose calculation in intraoperative electron radiation therapy
Verónica García-Vázquez1, Begoña Sesé-Lucio2, Felipe A Calvo2,3,4,5
1Instituto de Investigación Sanitaria Gregorio Marañón. Calle Doctor Esquerdo, 46, 28007, Madrid, Spain. vgarcia@hggm.es.
Radiation Oncology (London, England)
|December 12, 2018
Summary
Surface scanning improves 3D dose calculations in intraoperative electron radiation therapy (IOERT). Structured-light scanners offer superior accuracy over conventional methods, enhancing treatment documentation.
Area of Science:
- Medical Physics
- Radiation Oncology
- 3D Imaging Technologies
Background:
- Intraoperative electron radiation therapy (IOERT) dose calculations conventionally assume water-equivalent tissues and a flat surface.
- The actual irradiation surface shape significantly impacts dose distribution, yet is often overlooked in standard calculations.
- Accurate 3D dose mapping is crucial for optimizing IOERT treatment planning and delivery.
Purpose of the Study:
- To investigate the application of surface scanning technologies for precise 3D dose calculations in IOERT.
- To compare the accuracy of dose distributions derived from surface scanning versus conventional methods.
- To evaluate different 3D scanning technologies for their efficacy in a simulated IOERT environment.
Main Methods:
- Two 3D scanning technologies, a conoscopic holography sensor (ConoProbe) and a structured-light scanner (Artec), were tested in a simulated IOERT setup.
- Dose distributions were calculated using surface data from scanners and compared against computed tomography (CT) of the surgical field (gold standard).
- Calculations were also performed using the conventional flat-surface assumption for comparative analysis.
Main Results:
- The conventional flat-surface assumption yielded a low average gamma pass rate of 39.9% for dose values >10%.
- Incorporating surface data significantly improved dose calculation accuracy, with gamma pass rates of 88.5% (ConoProbe) and 92.9% (Artec).
- The structured-light scanner (Artec) demonstrated superior performance in achieving accurate 3D dose distributions.
Conclusions:
- Utilizing surface scanning data enhances the accuracy of 3D dose distributions in simulated IOERT surgical fields.
- Structured-light 3D scanning technology shows particular promise for improving IOERT dose calculations.
- Further research into surface scanning for IOERT is warranted to clinically document actual treatment scenarios more precisely.
Keywords:
Conoscopic holographyDose distributionIOERTIntraoperative radiotherapyStructured-light 3D scannerSurface scanningMore Related Videos
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