SU-E-T-526: Evaluation of Dose Mapping Errors via Use of a Volume-Based Dose Mapping Method

Medical Physics
H ChenJeffrey V Siebers

Abstract

To quantify dose mapping errors (DMEs) of a point-based dose mapping method for 4D lung treatment plans. Point-based dose mapping methods utilize deformation vector fields (DVFS) to interpolate dose from a deformed image. Volume-based dose mapping methods consider the volume overlap between deformed and reference voxels; defining dose as the integral energy divided by the integral mass of the voxel, and conserving integral dose . DME is defined as the dose differences between volume-based and point-based mapped dose (DME=(DpointBased-DvolumeBased)/DRx). The DME for a 4D lung case is compared with a bitmap DME method, both using a Pinnacle research version 8.1y DVF. DME is computed for ten 4D lung cases (five 10 phases, five 3 phase) with Pinnacle research version 9.100 DVFs. Multi-phase accumulated 4D DMEs are also evaluated. For all cases, the largest DMEs are located in the dose/density gradient regions. With Pinnacle 8.1y DVF, mapping dose from phase 9 to phase 0, results in a DME=-0.2%±6.1% (range of -76%∼112%). The same case with Pinnacle 9.100 DVFs, DME=0.3%±4.8%(-41%∼32%). Locations of large DME are consistent with those from the bitmap method. For the ten 4D lung cases, accumulated mean DME are within ±0.07% (std. devia...Continue Reading

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