# Does ITK already multiplies Rescale slope for each PET scan slice?

**URL:** <https://discourse.itk.org/t/does-itk-already-multiplies-rescale-slope-for-each-pet-scan-slice/2317>\
**Category:** Algorithms\
**Created:** [October 11, 2019, 3:56am UTC](https://discourse.itk.org/t/does-itk-already-multiplies-rescale-slope-for-each-pet-scan-slice/2317 "2019-10-11T03:56:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Jigabytes](https://discourse.itk.org/user_avatar/discourse.itk.org/jigabytes/32/967_2.png) [@Jigabytes](https://discourse.itk.org/u/Jigabytes)\
**Post date:** [October 11, 2019, 3:56am UTC](https://discourse.itk.org/t/does-itk-already-multiplies-rescale-slope-for-each-pet-scan-slice/2317/1 "2019-10-11T03:56:15Z")

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Hi,

Does ITK reader already considers multiplying rescale slope to the stored value of pixel intensity?  
I want to confirm before I do this conversion of each pixel value in each slice of a 3D PET scan

Thanks,  
Jiten

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**Author:** ![zivy](https://discourse.itk.org/user_avatar/discourse.itk.org/zivy/32/1726_2.png) [@zivy](https://discourse.itk.org/u/zivy)\
**Post date:** [October 11, 2019, 1:01pm UTC](https://discourse.itk.org/t/does-itk-already-multiplies-rescale-slope-for-each-pet-scan-slice/2317/2 "2019-10-11T13:01:40Z")

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Yes it does, that is why the PET values are in floats and not integral values.

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**Author:** ![Jigabytes](https://discourse.itk.org/user_avatar/discourse.itk.org/jigabytes/32/967_2.png) [@Jigabytes](https://discourse.itk.org/u/Jigabytes)\
**Post date:** [October 12, 2019, 10:36pm UTC](https://discourse.itk.org/t/does-itk-already-multiplies-rescale-slope-for-each-pet-scan-slice/2317/3 "2019-10-12T22:36:59Z")

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Thanks @zivy