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Thus, the above approach should be abbreviated as IGRT-D for image-guided radiation therapy delivery.Ī broader and more appropriate context of IGRT should include (1) detection and diagnosis, (2) delineation of target and organs at risk, (3) determining biological attributes, (4) dose distribution design, (5) dose delivery assurance and (6) deciphering treatment response through imaging.

However, the commonly adopted definition of image-guided radiation therapy (IGRT) appears too narrow, primarily connoting the use of near real-time imaging for treatment delivery verification and set-up correction. Recently, image guidance has derived significant impetus from the commercial availability of advanced on-line volumetric imaging technologies that permit treatment delivery verification in near real-time. In fact, the first use of x-ray tubes for cancer therapy involved the same kV radiation source for both imaging and treatment.

The concept of image guidance in radiation therapy is far from being new.

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