Scan Anatomy: Respiratory

Respiratory gating/triggering uses a respiratory device to reduce breathing artifacts in chest and abdominal imaging. The respiratory device is used with the Respiratory Gating/Triggering and Respiratory Compensation Imaging Options. When you select the Respiratory Gating/Triggering Imaging Option, the system automatically performs the appropriate process of gating or triggering depending on your pulse sequence selection. The Imaging Option selection also activates the Gating/Triggering tab in the Details area of the Scan session, where you can select supplementary parameters.

Respiratory gating uses the respiratory waveform to determine the quiescent (most quiet) period of the respiratory cycle to acquire data. This is at the valley of the cycle, end-expiration/beginning-inspiration. TR is applied continuously throughout the respiratory cycle.

Table 1. Image legend

Number	Description
1	Uniform TR

Respiratory triggering works in the same fashion as cardiac triggering, using the respiratory cycle to initiate RF application and data acquisition. The delivery of RF is synchronized with the respiratory cycle. It uses the patient's inspiration to trigger data acquisition.

Table 2. Image legend

Item	Description
TP	Trigger Point
TW	Trigger Window
DA	Data Acquisition