# Info behind Dicom tag - Decay Corrected(0018,9758)

**URL:** https://discourse.slicer.org/t/info-behind-dicom-tag-decay-corrected-0018-9758/31104
**Category:** Support
**Tags:** dicom, pet, suv
**Created:** [August 11, 2023, 1:28pm UTC](https://discourse.slicer.org/t/info-behind-dicom-tag-decay-corrected-0018-9758/31104 "2023-08-11T13:28:17Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![appos](https://avatars.discourse-cdn.com/v4/letter/a/a88e57/32.png) [@appos](https://discourse.slicer.org/u/appos)
#### Post date: [August 11, 2023, 1:28pm UTC](https://discourse.slicer.org/t/info-behind-dicom-tag-decay-corrected-0018-9758/31104/1 "2023-08-11T13:28:17Z")

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I seem to have a few doubts so please try to answer these individually.

1. There seems to be a DICOM tag Decay Corrected(0018,9758). The enumerated values are YES and NO. I have a situation in which this values is YES. If I am not wrong, this suggests that the decay correction has already been applied on the total\_dose(0018,1074). Then, SUV value then can be calculated by  
SUVbwScaleFactor = (weight \* 1000 / Total\_Dose(0018,1074))  
SUVbw = (stored pixel value in Pixel\_Data (7FE0,0010) \* Rescale\_Slope (0028,1053) + Rescale\_Intercept (0028,1052)) \* SUVbwScaleFactor

2. Lets assume Decay Corrected(0018,9758) is NO. I also have a decay factor tag (0054,1321). Then is this calculation correct  
SUVbwScaleFactor = (weight \* 1000) / (Total\_Dose(0018,1074) \* decay\_factor (0054,1321))  
SUVbw = (stored pixel value in Pixel\_Data (7FE0,0010) \* Rescale\_Slope (0028,1053) + Rescale\_Intercept (0028,1052)) \* SUVbwScaleFactor

These are links which I have referred

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[https://qibawiki.rsna.org/index.php/Standardized\_Uptake\_Value\_(SUV)](https://qibawiki.rsna.org/index.php/Standardized_Uptake_Value_(SUV))

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> **[SUV\_vendorneutral\_pseudocode\_happypathonly\_20180626\_DAC.pdf](https://qibawiki.rsna.org/images/6/62/SUV_vendorneutral_pseudocode_happypathonly_20180626_DAC.pdf)**
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