• Object ID: 00000018WIA30A00970GYZ
  • Topic ID: id_40022196 Version: 1.3
  • Date: Aug 28, 2022 7:00:40 PM

Scan Mode

There are four Scan Mode choices: two imaging acquisition modes (-1 and 0) and two spectroscopy acquisition modes (1 and 2) for Spectroscopy sequences.

  • The default value is 1.
  • The table below provides a description and application of each Scan Mode.
Table 1. Scan modes
Scan modeDescriptionApplication
-1Scans and displays an image of the slice centered within the voxel with narrow SAT bands placed at the edges of the prescribed voxel. Reduce the TR and TE to reduce the scan time.Produces an image with SAT bands defining the voxel location.
0Scans and displays an image of the voxel. This displays only the signal from the prescribed volume. Reduce the TR and TE to reduce the scan time.Use the voxel image to confirm the location of the voxel, to examine the shape and profile of the voxel, and to verify the absence of any fat contamination of the voxel. Useful when voxels are placed close to the scalp.
1Reconstructs spectra.

In 3D mode, reconstructs the chemical shift images within the 3D volume. The spectra will be at the exact locations as the localizer images. When using the CSI display tool, the overlay localizer images are the exact matches to the metabolic images. This is the default mode.

Acquires the spectrum with automatic slice position reconstruction when in 3D mode.
2Reconstructs spectra. In 3D mode, reconstructs chemical shift images exactly for the prescribed number of phase encoding steps, CSI Slice Thickness, and #CSI Slices regardless of the separation between the images on which they are prescribed. When displayed, the overlay localizer image is the closest match to the metabolic image.Acquires spectra with explicit slice position reconstruction when in 3D mode.