Operating system: Windows
Slicer version: 4.10.2
Expected behavior: Subtract two DICOM images
Actual behavior:

I just started using the 3D Slicer. I want to ask if I can subtract two DICOM images from each other using a user-defined equation. Specifically, to subtract the CT number (Hounsfield unit) If yes what and where should I start?

Hi, you can do this via the Subtract Image filter ( Module list>All modules> Simple Filters> SubtractImageFilter), there is also an AddImageFilter, MultiplyImageFilter , DivideImageFilter(and DivideFloor)

But still it does not work with my case because I need to use a formula in subtracting not a simple case of subtraction like A-B. What I want is to subtract Ax-Bx where A and B are the HU values and x is a constant value. Hope you can help me again. Thank you

Can you help me with how can I subtract two Dicom images, specifically to subtract their HU values or CT number? But before subtracting, I need to multiply constant value to the HU value of each image. For image 1 I need to multiply constant x while for image 2 I need to multiply constant y.

In the itk Simple Filters module, you could use the ShiftScaleImage filter on each of your images, and the scale factor would be x or y in your case, and shift would be zero. (This multiplies all voxels by constant value). Then you can use the subtract image
filter with the output images.