[Intl_DxMedPhys] Hybrid Canon IR/CT displayed CTDIvol accuracy

[Daniel Vergara]

For those of you who have worked with Canon CT scanners, in particular the
hybrid IR/CT Alphenix CT scanner, what has been your experience with the
displayed CTDIvol accuracy? Do you often get CTDI accuracy results with
large % differences?

We have measured repeated CTDIvol differences exceeding 20% for several
protocols of different collimation (nT), tube voltage, phantom size, pitch,
axial vs helical, scanned FOV and rotation time. And these high %
differences have repeated over the course of a year. We have reached out to
Canon reps for assistance, but have not gotten satisfactory help. We also
tried measuring the CTDI using the Canon CTDI instructions, in which 10
peripheral measurements are made with defined time delays for certain
rotation times and then averaged.

I'm fine admitting if we've performed the measurements incorrectly,
somehow, but I need to know how testing CTDI on a Canon Alphenix differs
from other scanners.


TIA
Daniel

-- 
Daniel Vergara
xvergarax at gmail.com
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