# For a liver CT, substract contrast induced changes in HU

**URL:** <https://discourse.slicer.org/t/for-a-liver-ct-substract-contrast-induced-changes-in-hu/36149>\
**Category:** Support\
**Created:** [May 14, 2024, 3:46pm UTC](https://discourse.slicer.org/t/for-a-liver-ct-substract-contrast-induced-changes-in-hu/36149 "2024-05-14T15:46:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pablomartin](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pablomartin/32/16588_2.png) [@pablomartin](https://discourse.slicer.org/u/pablomartin)\
**Post date:** [May 14, 2024, 3:46pm UTC](https://discourse.slicer.org/t/for-a-liver-ct-substract-contrast-induced-changes-in-hu/36149/1 "2024-05-14T15:46:30Z")

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Hi all, I´ve been asked to work on liver CT pre and post contrast application. Is it possible to adjust (substract) the intensities modifications induced by the contrast? What would be the best approach, thanks in advance.