[Jpersak]

 Dr. Fishman,

 Any experience or recommendations for Dose modulation of CT scans of the brain.   Increase mas for Improve resolution/noise  of the posterior fossa/brainstem  with decreased mas for supratentorial structures.  And overall decrease CDTI compared to standard helical imaging.

Thx
Joe Persak MD

[Elliot K. Fishman, MD]

I asked Tony Cook from Siemens your question and he said;

 Yes, using dose modulation on routine brain imaging is very common. The mAs will adjust on its own to account for the thicker bone at the skull base and petrous bones vs. the remainder of the brain.

The default Care Dose 4D quality reference mAs values in the Siemens default head protocols are a good place to start, then the QRM can be fine tuned up/down if needed depending on the Radiologist personal preference for image quality