Acceleration of online adaptive replanning with workflow automation (Presentation #238)
This abstract reports on the development of software tools to automate online adaptive re-planning (OARP) and the testing of these tools on both a conventional linear accelerator with an in-room CT scanner and an MR-linac. The research treatment-planning package has the ability to account for magnetic fields and includes fast replanning algorithms. The OARP process was broken down into five distinct modules: auto-segmentation based on daily CT or MRI scans; contour review and editing; adaptive plan generation; evaluation of the adaptive plan based on daily images; and transferring the new plan and performing quality assurance assessment prior to delivery. The automated tools and workflow were tested on 23 daily CT and MRI scans from five prostate cancer cases. Results show that OARP with the automation software tools, excluding the contour editing module, was 250 ±14 seconds, a 49% reduction in operation time compared with OARP conducted without the automated tools. The contour editing module, which was the most time consuming, ranged from five to ten minutes. Investigators conclude that the use of these automation tools substantially reduces the time for the online replanning process and eliminates user stresses and input errors during the online replanning process. The research team is working to improve the efficiency of the contour editing module.

The founding members of the Elekta MR-linac Consortium are: University Medical Center Utrecht, the Netherlands (UMCU); The Netherlands Cancer Institute-Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands; The University of Texas MD Anderson Cancer Center, Houston, Texas; the Institute of Cancer Research, working with its clinical partner The Royal Marsden NHS Foundation Trust, London, England; Froedtert & the Medical College of Wisconsin Clinical Cancer Center at Froedtert Hospital, Milwaukee, Wisconsin; The Christie NHS Foundation Trust, Manchester, UK and the Odette Cancer Centre, Sunnybrook Health Sciences Centre in Toronto.
Elekta's MR-linac is a work in progress and not available for sale or distribution.

SOURCE Elekta

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