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KMID : 1131320150170010045
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Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 1 p.45 ~ p.52
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Image Quality, Contrast Enhancement, and Radiation Dose of Non-ECG-Triggered High-Pitch CT Versus ECG-Triggered Chest pain CT of the Thoracoabdominal Aorta
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Seo Beom-Seok
Park Sang-Hyub
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Abstract
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Purpose : We sought to compare image quality, contrast enhancement, and radiation dose in patients undergoing Non-ECG triggered high pitch helical CT or ECG-triggered chest pain CT of the thoracoabdominal aorta.
Materials and methods : We retrospectively assessed data from 129 consecutive patients(94 men, 35women; mean age, 58.9±15.4[SD] years) undergoing clinically indicated CT angiography of the thoracoabdominal aorta on a dual-source scanner using either the non-ECG triggered high-pitch helical mode(group 1, n=69) or ECG-Triggered chest pain mode(group 2, n=60) during arterial phase. We assessed image noise and contrast enhancement throughout the thoracoabdominal aorta. Also two independent readers assessed image quality. Scanner-reported dose-length product values were used to estimate effective dose values.
Results : Image quality at the aortic root was higher in group 2(mean±SD, 2.63±0.51) than group 1(2.34±0.59; ρ=0.076). Group 1(mean±SD, 2.98±0.93) and group 2(2.96±0.19; ρ=0.64) was similar at the ascending aorta, also similar quality for both groups noted at other levels. Group 2 scans displayed higher image noise at the aortic arch level, and both groups displayed similar image noise at all levels. The groups received a similar volume of contrast material, and acceptable contrast enhancement (>250HU) were noted in the two groups. The estimated radiation dose was significantly lower in group 1(mean±SD, 7.6±0.94 mSv) than in group 2(33.5±9.1 mSv;ρ<0.0001).
Conclusion : Image of the thoracoabdominal aorta with non-ECG triggered high-pith CTA provides similar quality images of the aortic root and ascending aorta with sufficient contrast enhancement and decreased estimated radiation dose compared with ECG-triggered chest pain CT.
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KEYWORD
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High pitch, chest pain mode, dose reduction
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