In vivo validation of Elekta’s Clarity Autoscan® for ultrasound-based intrafraction motion estimation of the prostate during radiotherapy

The manuscript describes an in vivo validation of the Elekta Clarity Autoscan® system for estimating intrafraction prostate motion during radiotherapy. Intrafraction motion was estimated using Autoscan. These 3D motion estimates were used to estimate intraprostatic fiducial marker positions in 2D portal images. Estimated positions were compared to the actual portal imaged marker positions. Clarity monitored intrafraction motion with an accuracy of 0.6 mm, which is comparable to other motion monitoring systems used in radiotherapy.

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