Medical Physicist's Notes · Delta4 Phantom+
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.
Peer-reviewed studies that measured Delta4 Phantom+ directly, with the key result from each paper's abstract. The quoted line shows where the paper names Delta4 Phantom+.
Angular and dose-rate response uniformity better than 0.5%; Delta4 measured dose within 2.5% of the ionization chamber for IMRT and VMAT plans.
Bedford JL, Lee YK, Wai P et al.
“Evaluation of the Delta4 phantom for IMRT and VMAT verification.”
Measured vs calculated dose differed by -0.2 ± 0.9% across all detectors; 10 of 11 IMRT plans passed gamma (3%, 3 mm) at or above 95%.
Feygelman V, Forster K, Opp D et al.
“Delta4 is a useful tool for IMRT QA, allowing for essentially instantaneous on-line analysis of absolute dose errors in 3D.”
Reproducibility 0.1%, linearity <0.1%, dose-rate dependence 0.4%, calibration accuracy 0.4%; mean gamma (3%, 3 mm) pass rate 97 ± 2.7%.
Feygelman V, Opp D, Javedan K et al.
“The Delta4 biplanar diode array dosimeter was validated for helical tomotherapy delivery QA.”
Delta4 Phantom+
Posts in this section. New ones land here as they're added.
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-pulseIon 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 QADepartments 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?
Read thisWhere next
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