In Regard to Keall et al

We read with interest the review by Keall et al of real-time 3-dimensional (3D) image guided radiation therapy (IGRT) on standard-equipped radiation therapy systems.1 All clinically implemented techniques were based on markers, and the authors noted that although markerless tracking is preferable, it is challenging, especially in the abdominal-pelvic region. However, there are sites where it is possible.

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