The time sensitivity factor reflects another kinetic parameter of tumor metabolism besides SUV when using variable dual-time FDG PET. It offers another useful diagnostic tool in optimizing choices of dual-time protocols for oncologic PET-CT and in reducing SUV variations due to time interval differences with corrections using S.

The front pointer provides a twofold function: a crosshair shadow and an extended FSD measurement at the same time. The crosshair shadow is cast from two perpendicular 3D printed components blocking the light field. An indexing rod was integrated with crosshair components along the central axis to provide extended FSD reading. Results: The simulation workflow is as follows, (A) insert the light field accessory, (B) select proper applicator for the treatment site, (C) adjust Xstrahl gantry till the light field covers desired treatment area, (D) attach the front pointer accessory and record the FSD, (E) mark the field light edge and crosshair. The treatment workflow is as follows, (A) insert the light field accessory and treatment applicator, (B) adjust Xstrahl gantry till the crosshair and the light field match marks, and (C) start the treatment. Conclusion: With custom light field and front pointer accessories extended FSD treatments are feasible and reproducible for Xstrahl 150 units. The extended FSD setup helps avoid physical contact between cone and patient skin especially in open wound scenarios. The light field capability improves treatment area determination especially for uneven surfaces and simplifies patient setup for better reproducibility. The front pointer provides quick and accurate extended FSD measurements for treatment planning during simulation and optional second check for treatment setup.