Toshiba's CT Imaging Dose Reduction Software

Called AIDR3D, it has been tested at a facility in Florida, with good results.

Medical radiation exposures have soared in recent decades, and the medical community continues to take measures targeted at reducing them.

Here's a short, good video which explains how CT imaging software (generally similar to AIDR3D) is used for radiation therapy in a lung cancer case:

The anatomical planes she refers to are (she refers to the "axial" as the "transverse"):

The tattoos she mentions are very small permanent tattoos (can be removed by laser) and help to serve as "landmarks" (or "bodymarks"), to ensure repeated proper body positioning.  Radiation doses are typically fractionated (total dose is delivered in fractions over days or weeks).