Fig. 4.

Rows 1–3 show three consecutively acquired images for scans performed with no gating (column A), with CR-gating but no automatic respiratory reacquisition (column B), and for CR-gating with automatic respiratory reacquisition (column C). Row 4 shows the ‘best representation’ image which was produced from the average of the 20 image volumes acquired using cardio-respiratory synchronisation with automatic reacquisition of respiratory motion corrupted data. The boxed region enclosing the liver and heart is expanded for each image in Fig. 5. The data shown is slice 35 from mouse 1 using repetitions 1, 2 and 3 for each of the acquisition schemes which are entirely representative of all the data.