Respiratory Compensation

Respiratory Compensation uses a phase-sorting method to reduce phase ghosting from breathing motion when scanning in the chest or abdomen.

Table 1. Image legend

Number	Description
1	Respiratory Compensation turned off. Note that the arrows point to motion artifact
2	Respiratory Compensation turned on.

Use the Respiratory Compensation Imaging Option to reduce phase ghosting from breathing motion when scanning in the chest or abdomen.

• Use 2 or 4 NEX on patients with deep breathing patterns.
• If the patient’s breathing pattern cannot stay consistent during the acquisition, consider using a GRE, SSFSE, or EPI breath-hold method.

Choose the low or high sort Respiratory Compensation method.

• Low sort occurs when a No Phase Wrap value of 1.0 is selected.

  

• High sort occurs when a No Phase Wrap value of 2.0 is selected. High sort doubles the PFOV, phase matrix, resulting in phase ghosts moved to outside the displayed FOV.

  

Respiratory Compensation:

• Adds a 1 ms delay to the cardiac gating trigger delay.
• Requires that the patient have a consistent breathing pattern during the acquisition; look for the message Resp OK. The system will scan without the message Resp OK, but there will be no Respiratory Compensation benefits.
• Slightly lengthens scan time.
• High-sort may increase vessel motion, therefore, program motion suppression techniques as needed.
• Cannot use a NEX > 4.