[Intl_DxMedPhys] Siemens tube current modulation question

[Ryan Fisher]

Hello!

I’m digging into a question about our cardiac calcium scoring protocols. In poking through the DICOM info for scans across various Siemens scanners we noticed a variety of modulation types listed under the (0018 9323) “Exposure Modulation Type” tag. Does anyone happen to have any info on the values listed below? It’s been a while since I’ve dug into TCM details. For the OFF_ZEC scans, the mA values change with anatomy though the patient, but all the others look to be scaling mA to patient size but keeping it fixed throughout a given patient scan.

FWIW these came from a variety of Siemens scanners/vintages, including a Somatom Perspective, Force, Definition Edge, and Somatom.go All.

FIX_EC
PULS_MINDOSE_EC
PULS_EC
OFF_ZEC

Any info would be much appreciated.

Thanks!
Ryan



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Ryan Fisher, PhD, DABR, MRSE (MRSC™)
Department of Radiology
Chief Diagnostic Medical Physicist
Radiation Safety Officer
O 216.778.5453|  M 216.978.5276  |  rfisher1 at metrohealth.org<mailto:rfisher1 at metrohealth.org>
MetroHealth Main Campus  |  2500 MetroHealth Drive, Cleveland, OH 44109
Associate Professor
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