Spiral and 3DASL

Use this information when adjusting parameters on the Detail tab for 3DASL and SPIRAL series.

• Increasing the arms results in increased Signal-to-Noise Ratio (SNR), scan time, and spatial resolution, but the Frames Per Second (FPS) decreases (Real Time).
• As the number of points increases, spatial resolution increases as indicated by the smaller effective resolution. As pixel size gets smaller, SNR decreases as indicated by the SNR meter. As pixel size gets smaller in Real Time, FPS and SNR decrease. The prescribed number of arms and RBw affect the maximum number of points allowed.
• The effective resolution displays, in millimeters, once the FOV, arms, points, and RBw are defined. It is calculated by the system.