= Attenuated Radon transform
{title2=$\mathcal R_\mu f$}
The integral of a source over a directed line, weighted by exponential absorption between each source point and a detector. For line coordinates $x=p\boldsymbol n+s\boldsymbol d$ and a detector at the negative end, it is $\int f(p,s)\exp[-\int_{-\infty}^s\mu(p,r)dr]ds$. The <integrating factor> of a <transport equation> derives the weight. Reversing the detector direction changes the weight for spatially varying attenuation, so the two directed measurements need not coincide. Setting $\mu=0$ recovers the <Radon transform>.
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