[Intl_DxMedPhys] EXT MSG Re: [EXTERNAL] Re: ACR CT Pediatric Clinical Image Question

[Dave Jordan]

Mike, I think a reasonable way to make an argument that CTDIvol values are (or are not) reasonable across patient sizes is to compare their SSDE values. If you convert your 10 mGy @ 40-50 lb. to an SSDE, and then also look at the SSDE for the 175 lb. patient, how similar (or not) are they?

Of course there is no rule that SSDE should be constant across patient sizes, but this is still a useful check to see how they compare.

There are some publications that propose useful ways to use patient weight as a size parameter for SSDE instead of patient/effective/water-equivalent diameter, which you need if you’re trying to set up weight-based protocols, although if you have access to the images that were already scanned (sounds like you do) then you should be able to directly measure one of the size parameters used in AAPM Report 204/220.

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