Figure 2

(a) Demonstration of SAFI geometry with 51 beams pointing to a circular target at the center. The red triangles represent MAC’s collimation areas. The shapes of the MAC apertures can be designed based on the anatomy of the animal subject. The MAC can be manufactured by 3D printing techniques. (b) Diagram of single-beam MAC design and illustration of x-ray leakage from the neighboring sources. A properly designed MAC should also prevent unnecessary radiation exposure by leaking x-rays from adjacent sources.