The principal time restraints in cardac imaging is the filling of k-spaces. What are the 3 ways to reduce time by the way k-space is filled?
1.Half fourier- mirroring data to fill k-space quicker.- only half of k-space is filled and mirrored to the other side. A few lines in the center of k-space may be acquired to increase snr.
2.Segmentation- essentially is when multiple phase encoding signals are acquired during a single heartbeat. Complete k-space is filled over 10-20 heartbeats. Segmentation of k-space can be implemented to produce multiple image planes.
3.Spiral filling- k-space is filled from the center out in a spiral fashion so that more data is located in the center, this provides improved contrast resolution and faster imaging times.