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Cardiac gating in intravenous DSA.

E Gmelin, H D Weiss, F Buchmann

European Journal of Radiology

|February 1, 1986

Summary

ECG-gating in digital subtraction angiography improves visualization of major arteries and may reduce false positives for renal artery stenosis. This technique addresses artifacts common in non-gated angiography.

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Area of Science:

Medical Imaging
Cardiovascular Diagnostics
Radiology

Background:

Non-gated digital subtraction angiography (DSA) can produce misregistration artifacts due to patient or vessel motion.
These artifacts, particularly the smear effect from integrating multiple video frames, can complicate the interpretation of vascular structures.
Accurate assessment of the aortic arch, pulmonary arteries, and renal arteries is crucial for diagnosing various cardiovascular conditions.

Purpose of the Study:

To evaluate the effectiveness of electrocardiogram (ECG)-gating during pulsed radiation exposure in digital subtraction angiography.
To compare the diagnostic quality of ECG-gated DSA with non-gated DSA, focusing on specific vascular beds.
To identify and explain common artifacts in non-gated DSA and potential challenges with ECG-gated DSA.

Main Methods:

Utilized ECG-gating synchronized with end-diastole for pulsed radiation exposure during DSA.
Acquired DSA images of the aortic arch vessels, pulmonary arteries, and renal arteries.
Described and illustrated misregistration artifacts (smear effect) observed in non-gated DSA sequences.

Main Results:

ECG-gated DSA demonstrated significantly improved visualization of the aortic arch and pulmonary arteries.
The technique is expected to reduce the rate of false-positive diagnoses of stenosis in renal arteries.
Artifacts from integrating multiple frames in non-gated DSA were detailed.

Conclusions:

ECG-gating during DSA significantly enhances the imaging of major thoracic and abdominal arteries.
This method offers a potential solution for reducing diagnostic errors, particularly in renal artery stenosis assessment.
Challenges such as heart rate variability in ECG-gated DSA require consideration.

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