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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