05033 – Spiral-PR

In MRI, images are reconstructed from data acquired in a domain known as k-space. The order in which the k-space data is collected is called the k-space trajectory. The most common polar trajectories are spiral and projection-reconstruction (PR). One drawback with existing polar trajectories is that their ability to vary the sampling density is limited. Spiral-PR is a hybrid trajectory which employs spiral sampling on one or more k-space axes, and PR sampling on the remaining k-space axes. This arrangement makes it possible to greatly vary the k-space sampling density. As a result, this trajectory permits a large amount of flexibility in varying, and thus optimizing, the resolution-artifact trade-off inherent in under-sampled k-space acquisitions. Mark Taylor mark.taylor@uhnresearch.ca 416-581-7404