Increased number of beam angles is associated with higher cardiac dose in adjuvant fixed gantry intensity-modulated radiation therapy of left-sided breast cancer

In the treatment of breast cancer, fixed gantry intensity-modulated radiotherapy (FG-IMRT) can be delivered via standard tangents or multiple gantry angles, which alters the dose distribution for nearby organs at risk. We analyzed the relationship between angle number and mean heart dose (MHD) in adjuvant FG-IMRT treatment of left-sided breast cancer as is currently practiced in the community.

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