The study involved five patient cases including medical history as well as CT and MR imaging. Researchers compared planning steps of CT-MR image registration, GTV definition, CTV definition, PTV definition and SRS treatment planning.
Radiation Oncology published the study.
Here are five things to know:
1. The study discovered image registration variability ranged between translational 1.1 mm and 2.4 mm as well as rotational 1.1 degrees and 2 degrees in all three directions.
2. GTV delineation variability was 0.8 mm in axial and 1.2 mm in longitudinal direction.
3. CTV margins to PTV margins differed between 0 mm and 2 mm.
4. Delineation variability proved to be 1 mm in axial directions for the spinal cord.
5. The researchers concluded spine radiosurgery variability exists in academic centers. They call for established delineation and planning criteria, as it could impact outcomes.
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