[Intl_DxMedPhys] Siemens tube current modulation question

[troyxzhou at icloud.com]

My apologies. I hit reply instead of reply to all. Here is what I sent to Ryan earlier 😊

 

FIX_EC                                             fixed exposure control, e.g., fixed effective mAs

PULS_MINDOSE_EC                      retrospective pulsing MinDose: 4% dose for base, 100% dose for pulse

PULS_EC                                          retrospective pulsing regular: 25% dose for base, 100% dose for pulse

OFF_ZEC                                          Z modulation only no angular modulation

 

 

From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+troyxzhou=icloud.com at lists.osu.edu> On Behalf Of Ryan Fisher via Intl_dxmedphys_wd_osu_list
Sent: Wednesday, April 23, 2025 1:32 PM
To: intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: [Intl_DxMedPhys] Siemens tube current modulation question

 

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

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  |   <mailto:rfisher1 at metrohealth.org> rfisher1 at metrohealth.org

MetroHealth Main Campus  |  2500 MetroHealth Drive, Cleveland, OH 44109

Associate Professor



 


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