Medical Physicist's Notes · Delta4 Phantom+
Posts for the physicist runningpatient-specific IMRT/VMAT QA.
Each card opens a focused post on one aspect of the Delta4 Phantom+ workflow — error-detection sensitivity, pre-treatment cohort gamma analysis, AAPM TG-218 alignment. Each post is self-contained, with peer-reviewed citations inline.
Delta4 Phantom+
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Posts in this section. New ones land here as they're added.
Sensitivity to introduced plan errors
At what magnitude of MLC, gantry, collimator or MU error does the Delta4 gamma passing rate cross the 95 % action threshold? Per Udee 2024, J Med Phys.
Read thisPulse-by-pulse50 nGy per-pulse integration — why it matters for FFF and FLASH
Ion chambers under-respond and many diodes drift at high dose-per-pulse. What changes when the detector integrates one pulse at a time at 50 nGy resolution?
Read thisPatient QA + Machine QAOne phantom — TG-218 patient QA and TG-142 machine QA
Departments routinely run separate equipment for patient-specific QA and routine machine QA. What changes when the same 1,069-detector array runs both workflows under one software ecosystem?
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