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A Quick Auto-Planning (QAP) Method for Patient Intensity Modulated Radiotherapy (IMRT)

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J Peng

J Peng*, Z Zhang , J Wang , J Xie , S Lu , J Zhao , W Hu , Fudan University Shanghai Cancer Center, Shanghai, Shanghai


SU-F-T-336 (Sunday, July 31, 2016) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose:The aim of this study is to develop a quick auto-planning system that permits fast patient IMRT planning with conformal dose to the target without manual field alignment and time-consuming dose distribution optimization.

Methods:The planning target volume (PTV) of the source and the target patient were projected to the iso-center plane in certain beam-eye-view directions to derive the 2D projected shapes. Assuming the target interior was isotropic for each beam direction boundary analysis under polar coordinate was performed to map the source shape boundary to the target shape boundary to derive the source-to-target shape mapping function. The derived shape mapping function was used to morph the source beam aperture to the target beam aperture over all segments in each beam direction. The target beam weights were re-calculated to deliver the same dose to the reference point (iso-center) as the source beam did in the source plan. The approach was tested on two rectum patients (one source patient and one target patient).

Results:The IMRT planning time by QAP was 5 seconds on a laptop computer. The dose volume histograms and the dose distribution showed the target patient had the similar PTV dose coverage and OAR dose sparing with the source patient.

Conclusion:The QAP system can instantly and automatically finish the IMRT planning without dose optimization.

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