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Text
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URL Address
<a href="http://doi.org/10.2214/ajr.11.6921" target="_blank" rel="noreferrer noopener">http://doi.org/10.2214/ajr.11.6921</a>
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Pages
931-938
Issue
4
Volume
198
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Title
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Image Quality, Contrast Enhancement, and Radiation Dose of ECG-Triggered High-Pitch CT Versus Non-ECG-Triggered Standard-Pitch CT of the Thoracoabdominal Aorta
Publisher
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American Journal of Roentgenology
Date
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2012
2012-04
Subject
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diagnosis; Radiology; Nuclear Medicine & Medical Imaging; aorta; reconstruction; heart-rate-variability; angiography; acquisition; CT angiography; dissection; dual-source ct; high pitch; source cardiac ct
Creator
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Bolen M A; Popovic Z B; Tandon N; Flamm S D; Schoenhagen P; Halliburton S S
Description
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OBJECTIVE. We sought to compare image quality, contrast enhancement, and radiation dose in patients undergoing ECG-triggered high-pitch helical CT or non-ECG-synchronized helical CT of the thoracoabdominal aorta. MATERIALS AND METHODS. We retrospectively assessed data from 101 consecutive patients (81 men, 20 women; mean age, 71 +/- 11 [SD] years) undergoing clinically indicated CT angiography (CTA) of the thoracoabdominal aorta on a dual-source scanner using either the ECG-triggered high-pitch helical mode (group 1, n = 52) or non-ECG-synchronized standard-pitch helical mode (group 2, n = 49) during the arterial phase. Two independent readers assessed image quality, noise, and contrast enhancement throughout the thoracoabdominal aorta. Scanner-reported dose-length product values were used to estimate effective dose values. RESULTS. Image quality at the root-proximal ascending level was higher in group 1 (mean +/- SD, 2.81 +/- 0.40) than in group 2 (1.22 +/- 0.47; p < 0.0001), with similar quality for both groups noted at other levels. Group 1 scans displayed higher image noise at all levels. The groups received a similar volume of contrast material (p = 0.77), and similar percentages of cases with acceptable contrast enhancement (> 250 HU) were noted in the two groups. The estimated radiation burden was significantly lower in group 1 (mean +/- SD, 5.4 +/- 1.8 mSv) than in group 2 (14.4 +/- 5.1 mSv; p < 0.0001). CONCLUSION. Imaging of the thoracoabdominal aorta with ECG-triggered high-pitch CTA provides higher quality images of the aortic root and ascending aorta with sufficient contrast enhancement and decreased estimated radiation dose compared with non- ECG-synchronized standard-pitch helical CT.
Identifier
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<a href="http://doi.org/10.2214/ajr.11.6921" target="_blank" rel="noreferrer noopener">10.2214/ajr.11.6921</a>
Format
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Journal Article or Conference Abstract Publication
2012
acquisition
American Journal of Roentgenology
Angiography
Aorta
Bolen M A
CT angiography
Diagnosis
Dissection
dual-source ct
Flamm S D
Halliburton S S
heart-rate-variability
high pitch
Journal Article or Conference Abstract Publication
Nuclear Medicine & Medical Imaging
Popovic Z B
Radiology
reconstruction
Schoenhagen P
source cardiac ct
Tandon N