[Intl_DxMedPhys] GY descriptor on GE Revolution HD CT

[Szczykutowicz, Timothy P]

What is in the dicom header for image 0028 1054? This image and tool is on the scanner or on a PACS or other DICOM viewer? If a rad showed, I am guessing on PACS.
I just checked, we have 3 apexes, reformatted images are units of HU on a Change Healthcare PACS. Albeit I didn’t check all three.

Timothy P. Szczykutowicz, Ph.D., DABR
Associate Professor
Departments of Radiology, Medical Physics and BME
University of Wisconsin Madison
Cell# 1-716-560-7751<tel:(716)%20560-7751>
Office# 1-608-263-5729
he/him/his

From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+tszczykutowicz=uwhealth.org at lists.osu.edu> On Behalf Of Berkowitz, Lindsey K via Intl_dxmedphys_wd_osu_list
Sent: Friday, February 14, 2025 1:08 PM
To: intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: [Intl_DxMedPhys] GY descriptor on GE Revolution HD CT


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Happy Friday! Has anyone ever seen ‘GY’ as a descriptor on a CT ROI, as opposed to seeing HU? One of our GE Revolution HD units will display 10 HU on the axials, but then switch to 10 GY for coronals and sagittals. Example below. 
Happy Friday!

Has anyone ever seen ‘GY’ as a descriptor on a CT ROI, as opposed to seeing HU? One of our GE Revolution HD units will display 10 HU on the axials, but then switch to 10 GY for coronals and sagittals. Example below. In the example one my of radiologists showed me, there was pretty good agreement in the numerical value between HU and GY. I’m inclined to think it’s a setting that GE will need to change but nothing is noted in the technical manual, and I’m curious if anyone has seen this descriptor.

Thanks!
Lindsey

[A close-up of a ct scan    Description automatically generated]


Lindsey Berkowitz, PhD (she/her)
Director of Imaging Physics and Radiation Safety Officer
MaineHealth Maine Medical Center - Portland
22 Bramhall Street | Portland, ME 04102
lindsey.berkowitz at mainehealth.org<mailto:lindsey.berkowitz at mainehealth.org>
mainehealth.org

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