Classic

Use the Classic Imaging Option to reduce the contribution of off-resonant signals to spin-echo images by exploiting the chemical shift artifact in the slice selection direction.

Classic:

• slightly decreases SNR
• produce images with a lower signal from fat in anatomy, such as orbits or extremities
• enhance the effectiveness of fat chemical saturation techniques with Spin Echo acquisitions
• is not a substitute for chemical saturation
• produces lower signal intensities from a wide range of frequencies. If you want to see many shades of gray, do not use Classic
• look for a larger variance between muscle and fat signals. Its effects can be emphasized via center-frequency adjustment
• is sensitive to the center-frequency selection
  • centering on fat decreases water signal
  • centering on water decreases fat signal
  • centering on the midpoint decreases both fat and water signal
• potentially decreases bright signal artifacts that fold back into the surface coil spine and pelvis images with FRFSE or FSE pulse sequences
• reduce annefact with FSE-XL sagittal spine scans acquired with an FOV up to 28 cm