Figure 1.

Schematic depiction of the alternating viewsharing technique. The central ky-kz disk defined by the keyhole percentage is subdivided in 3 regions, P⁺, C and P^-, where P⁺ and P^- cover positive and negative peripheral regions in this central disk and C is the central region as shown. The central region C is acquired in each dynamic scan while regions P⁺ and P^- are shared with subsequent dynamic scans according to an alternating viewsharing scheme: P⁺-C-P^--C-P⁺-C-P^--C-P⁺-Ref. The P^- and P⁺ parts from subsequent keyhole scans are shared in the reconstruction process.