Quantum GX2 microCT Imaging System Manual Chapter 6 | Image Acquisition 55
6.8 CT Scan With Cardiac Gating
1. Click the cardiac gating button.
2. Turn on Live Mode by clicking the button in the Control Panel.
The Xcapture window appears and shows the subject in real time (Figure 6.16).
Table 6.3 Gating Parameters
Parameter Gating Type Description
Threshold Respiratory The threshold applied to the entire waveform to separate the
baseline from the peaks. This allows for an initial separation of
the relaxed state of the diaphragm (baseline) from the
inspiration/expiration phases of diaphragm motion (peak).
Inspiratory threshold Respiratory A secondary threshold that further refines point selection
above the initial threshold.
Reducing this threshold reduces the number of points on the
waveform selected as 'end inspiration' points. This can help
identify the transition point in diaphragm motion between the
inspiration and expiration phases. However, fewer points may
also lead to a noisier image reconstruction.
Expiratory threshold Respiratory A secondary threshold that further refines point selection
below the initial threshold.
Reducing this threshold reduces the number of points on the
waveform selected as 'end expiration' points. This can help
refine selection of the resting phase from the inspiration/
expiration phases.
Rising invalid frames Respiratory The number of frames to ignore on the rising (inspiration) side
of the peak.
Falling invalid frames Respiratory The number of frames to ignore on the falling (expiration) side
of the peak.
Cardiac Cutoff Frequency Cardiac Frequency (Hz) that is used to separate the cardiac portions of
the waveform from background signals. Frequencies above
this value are considered part of the cardiac signal. This is
related to the heart rate (for example, 300 beats per minute = 5
Hz).
IMPORTANT: If you need to abort acquisition and stop X-ray generation, click the
emergency stop button in the Control Panel.
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