A Dosimetric Comparison Between Conventionally Fractionated Tomotherapy, Volumetric Modulated Arc Therapy, Sliding Window and Proton Therapy, and Hypofractionated Robotic Radiosurgery Treatment by Low-Risk Prostate Carcinoma

Abstract

There were no differences in the D90 or V100 of the whole prostate, midgland or base when calculated by MRI only dosimetry compared to CT-MRI fusion (P >0.19), but prostate apex D90 was 13% higher when calculated by MRI alone (P Z 0.034). In both methods the D90 and V100 of the base of the prostate gland was reduced 22% compared to the prostate apex and mid-gland. Conclusion: Post-implant MRI only based dosimetry with positive contrast, brachytherapy strand MRI markers is reliable and provides dosimetric values equivalent to CT-MRI fusion, reducing the need for postimplant CT imaging.