3D Dosimetry in Magnetic Fields

Authored by: Geoffrey S. Ibbott , Gye Won (Diane) Choi , Hannah Jungeun Lee , Yvonne Roed , Zhifei Wen

Clinical 3D Dosimetry in Modern Radiation Therapy

Print publication date:  October  2017
Online publication date:  October  2017

Print ISBN: 9781482252217
eBook ISBN: 9781315118826
Adobe ISBN:

10.1201/9781315118826-26

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Abstract

The benefits of visualizing a patient's anatomy during the treatment position led to the development of image-guided radiation therapy (IGRT). Modern linear accelerators are generally equipped with onboard imaging systems that allow the patient to be imaged, potentially at any time, and often just before delivering the radiation. This allows the patient's position to be verified and small adjustments to be made to the treatment parameters to compensate for changes in position or anatomy. Most IGRT modalities use kilovoltage x-rays to generate images: some examples include projection images and cone-beam computed tomography (CBCT) images. Megavoltage images (portal images) made using the treatment beam and an electronic imaging system are frequently used for treatment verification. These images allow positioning of the patient based on anatomical structures and can reduce the uncertainty in aligning the treatment beam with the location of the target.

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