Abstract:More and more attention tend to the application of intensity modulated radiation therapy (IMRT) treatment ofmalignantcancer.The accuracy of the radiotherapy is raisingbecause of the increased radiosensitivity of bone marrow. Imaging modality quantified the distributions of bone marrow, which could further reduce the volume to avoid. Bone marrow-sparing intensity-modulated radiotherapy can reduce the pelvic bone marrow irradiation volume, which may reduce the probability of acute bone marrow inhibit. It is worthy of application widely.