Algorithm 1.

Projection texture mapping.

Input: Cherenkov/dose image $I_{\mathrm{ch}}$, 3D body model $G$, UV map correspondence $\mathbf{F}$

Loop: Pixel $(m,n)$ in $I_{\mathrm{ch}}$

Generate camera ray $\mathbf{R}(x,y)$

If$\mathbf{R}(m,n)$ intersect with $G$ at location $(x,y,z)$

Search the UV location $(i,j)$ of $(x,y,z)$ through $(i,j)=\mathbf{F}(m,n)$

$UV(i,j)=I_{\mathrm{ch}}(x,y)$

end if

end Loop

Output: UV as the Cherenkov/dose UV map of the 3D body model