Minimum Acquisitions

You can force the scan software to use multiple acquisitions, no matter how many slice locations are prescribed. By selecting three acquisitions, for example, the scan software divides the total set of prescribed slices into three separate acquisitions.

For FSE scans:

• Although the number of acquisitions still controls the scan time, programming more acquisitions changes the shape of the 180 inversion pulse in addition to increasing scan time.
• For two-acquisition exams, the inversion thickness is approximately three times as thick as the imaging slice. For maximum suppression of CSF ghosting artifacts, use two- or three-acquisition protocols. The thicker the inversion pulse the greater the CSF artifact reduction.
• In FLAIR, the Minimum Acquisitions is used as a factor to multiply the slice thickness of the Inversion Pulse.
• The thickness of the Inversion pulse = (slice thickness) x (number of acquisitions). The thickness of the Excitation pulse = the value selected in the Scan Parameters area.