K-Space Tool: Reduced Scan Percentage
Reducing the scan percentage (aka phase resolution) to less than 100% means not acquiring the most peripheral lines in k-space. An extreme example is shown on this page, where the scan percentage is just 20%. You can see the effect on the image. The omission of so many high spatial frequencies means many edges and much of the fine detail is lost. In addition to this, we can now see some truncation artefact in the same direction in which the reduction of data acquisition is implemented. This is because the high contrast boundary cannot be properly represented without the higher spatial frequencies. You can tell it's truncation1 artefact and not motion artefact because the artefact decreases in amplitude with distance from the high contrast boundary.
A scan percentage of 80% will usually have little discernable effect on the image.
1Truncation of the Fourier series describing the high contrast boundary.
Choose from the list below alter k-space.