Algorithm 1.

Data harmonization.

Input	CCT image $A_0\left(n\right)$ and CXR image $B_0\left(n\right)$ of subject $n$.
Step 1	For CCT image $A_0\left(n\right)$ 64 central slices are reserved, and top/bottom slices are removed
Step 2	For CXR image $B_0\left(n\right)$ Central rectangle region is reserved, and outskirt pixels are removed.
Step 3	CCT images are resized to $1024\times 1024$, and CXR image is resized to $2048\times 2048$.
Output	CCT image $A_1\left(n\right)$ and CXR image $B_1\left(n\right)$. $size\left[A_1\left(n\right)\right]=1024\times 1024\times 64$. $size\left[B_1\left(n\right)\right]=2048\times 2048$.