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CT Dose Estimates and Descriptors: What They Do and Dont Mean

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CT Dose Estimates and Descriptors: What They Do and Dont Mean

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    1. 1 CT Dose Estimates and Descriptors: What They Do and Don't Mean Michael F. McNitt-Gray, PhD, DABR, FAAPM Professor, Department of Radiology Director, Biomedical Physics Graduate Program David Geffen School of Medicine at UCLA

    2. CT Specific Dose Definitions CTDI and its cousins CTDI100 CTDIw- weighted CTDIvol DLP (effective dose E, briefly) Dose Reports

    3. CTDI defined CTDI is NOT PATIENT DOSE See McCollough et al, Radiology. 2011 May;259(2):311-6. PMCID: PMC3079120 CTDI is dose in a phantom:

    4. CTDI defined CTDI Does Represent: Average dose in a phantom along the z direction at a given point (x,y) in the scan plane over the central scan of a series of scans when the series consists of a large number of scans separated by the nominal beam width (contiguous scanning)

    5. CTDI Phantoms Body (32 cm diam), Head (16 cm diam) Holes in center and at 1 cm below surface

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