How can I assess the SUVmean, max and ratio in a PET-CT scan using Horos?
I know how to create a ROI and read the hounsfield units/Bqml for CT or PETCT scans but I don't know how I can see what the SUVmean for that ROI is.
Is it also possible to select an ROI in a CT-scan and connect this scan to the PET-images, thereby automatically selecting the same ROI in the PET scan and thus known both HU/BQML and SUV for that region?
Hi Anouk,
I have not used Horos, so hopefully, someone with specific experience will come along and answer your question.
Most analysis software should allow you to save your ROI drawn on the CT and to then upload it on the PET scan. You should ensure that both PET and CT are co-registered and are handled similarly (for example, do not crop then differently)
If the software does not give the SUV values itself, then it can be calculated as Activity concentration in the tissue/Activity concentration in the whole body. Activity concentration in the whole body is injected dose/body weight. Make sure to use the same units for both tissue concentration and body concentration.
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