Precision IORT - image guided intraoperative radiation therapy (igIORT) using online treatment planning including tissue heterogeneity correction
Background: To the present date, IORT has been eye and hand guided without treatment planning and tissue heterogeneity correction. This limits the precision of the application and the precise documentation of the location and the deposited dose in the tissue. Here we present a set-up where we use im...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2017
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| In: |
Physica medica
Year: 2017, Volume: 37, Pages: 82-87 |
| ISSN: | 1724-191X |
| DOI: | 10.1016/j.ejmp.2017.04.017 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1016/j.ejmp.2017.04.017 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S1120179717301035 
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| Author Notes: | Frank Schneider, Frederic Bludau, Sven Clausen, Jens Fleckenstein, Udo Obertacke, Frederik Wenz |
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| 520 | |a Background: To the present date, IORT has been eye and hand guided without treatment planning and tissue heterogeneity correction. This limits the precision of the application and the precise documentation of the location and the deposited dose in the tissue. Here we present a set-up where we use image guidance by intraoperative cone beam computed tomography (CBCT) for precise online Monte Carlo treatment planning including tissue heterogeneity correction. Materials and methods: An IORT was performed during balloon kyphoplasty using a dedicated Needle Applicator. An intraoperative CBCT was registered with a pre-op CT. Treatment planning was performed in Radiance using a hybrid Monte Carlo algorithm simulating dose in homogeneous (MCwater) and heterogeneous medium (MChet). Dose distributions on CBCT and pre-op CT were compared with each other. Spinal cord and the metastasis doses were evaluated. Results: The MCwater calculations showed a spherical dose distribution as expected. The minimum target dose for the MChet simulations on pre-op CT was increased by 40% while the maximum spinal cord dose was decreased by 35%. Due to the artefacts on the CBCT the comparison between MChet simulations on CBCT and pre-op CT showed differences up to 50% in dose. Conclusions: igIORT and online treatment planning improves the accuracy of IORT. However, the current set-up is limited by CT artefacts. Fusing an intraoperative CBCT with a pre-op CT allows the combination of an accurate dose calculation with the knowledge of the correct source/applicator position. This method can be also used for pre-operative treatment planning followed by image guided surgery. | ||
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