Abstract #4833

Magnetic resonance imaging in the evaluation of dose distribution of a radiotherapy plan for brain metastases

Jianxin Ren¹, Guanzhong Gong¹, Xinsen Yao¹, Weiqiang Dou², Weiyin Vivian Liu², and Yong Yin¹

¹Department of Radiation Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China, ²GE Healthcare, MR Research China, Beijing, China

In this study, a protocol of pseudo CT values obtained on MRI for treatment planning was proposed. The tissue or organ-specific CT values in representation of the electron density acquired from 35 patients with brain metastases were assigned to MRI. The dose distribution was recalculated, and the dosimetric differences between a new plan and an original plan were compared. The results showed that the dose distribution errors were basically controlled under 2.0% with pseudo CT values to bones, cavities and soft tissues, and lowered than 1.5% with pseudo CT values to different tissues and organs.

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