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RadiAnt DICOM Viewer - Discussion Forum
How is SUV calculated from dicom PET/CT image files

Jul 18, 2018 03:19 PM
by Haifang
I fused CT and PET images using your nice software and I get SUVbw in ROI tools. I wonder how this is exact calculated from dicom tags and dicom intensity. I am interested to generate a SUV map.

Thank you!
Jul 19, 2018 07:58 AM
by RadiAnt
SUVbw is calculated using the formula shown.
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Jul 19, 2018 08:17 PM
by Haifang
Thank you for your quick reply. I tried this formula with my PET/CT data. My calculated result are close but not exactly the same as Radiant reported.

PET ROI: mean=10857.29 Max=14059.85 Min=6662.94
SUV same ROI: mean=3.134 Max=4.059 Min=1.924

Relevant DICOM header:

(0008,0031) TM 153348 # Series Time
(0008,0032) TM 154644.500000 # Acquisition Time
(0010,1030) DS 100.788 # Patient's Weight
(0018,1072) TM 142110.000000 # Radiopharmaceutical Start Time
(0018,1074) DS 552410034.17969 # Radionuclide Total Dose
(0018,1075) DS 6586.2 # Radionuclide Half Life

My mean SUV is 3.378 (using series time tag) and 3.400 (using acquisition time).
I must have missed some factor. Any advise?

Jul 20, 2018 12:18 PM
by RadiAnt
Please note that this is the support forum for RadiAnt DICOM Viewer software. I'm afraid that solving issues with your own SUV calculations is beyond the scope of support that we can provide here.
Jul 20, 2018 01:44 PM
by Haifang
Okay. Thank you!
Dec 13, 2018 10:53 AM
by Dr. Elnur Mehdi
There is small bug I faced when calculating SUV values in PET/CT. This occurs at the initial and last few (~36 + 36) slices of PET images (in fact, this is the first and last PET scanning bed, which means ~10+10 cm of body). In these images the values are calculated with the Bq/ml unit. Everything is OK at the middle images of study and the values come with SUVbw (g/ml) units.
Dec 21, 2018 06:26 PM
by RadiAnt
Just for the record, this issue has been corrected in the 4.9.15 BETA version. Now SUV values are calculated in all slices of your PET studies. Thank you for reporting this!
Mar 12, 2022 06:46 PM

Mar 30, 2022 09:14 PM
by RadiAnt
No, the formula provided here is the only documentation we have on SUVbw calculations.
Nov 13, 2023 12:38 PM
by ahmed nm
hi, recently i got the link of exam and when i fused the ct ac with pet mac the suv values were magnified to ten times more for example liver pool measured suv= 40?

Nov 26, 2023 08:14 PM
by RadiAnt
Hi, please contact us directly via
We would need a sample source file to check the reason of your issue.
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