Bolus timing in high-pitch CT angiography of the aorta

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• 作者：Martin Beeres^a ; ^{beeres@gmx.net} ; Matthias Loch^a ; ¹ ; ^{MatthiasLoch@gmx.net} ; Boris Schulz^a ; ¹ ; ^{boris.schell@googlemail.com} ; Matthias Kerl^a ; ¹ ; ^{matthias.kerl@gmail.com} ; Firas Al-Butmeh^a ; ¹ ; ^{Firas.Albutmeh@gmail.com} ; Boris Bodelle^a ; ¹ ; ^{bbodelle@googlemail.com} ; Eva Herrmann^b ; ² ; ^{Herrmann@Med.Uni-Frankfurt.de} ; Tatjana Gruber-Rouh^a ; ¹ ; ^{tatjanagruber2004@yahoo.de} ; Clara Lee^a ; ¹ ; ^{Clara.Lee@kgu.de} ; Volkmar Jacobi^a ; ¹ ; ^{Volkmar.Jacobi@kgu.de} ; Thomas J. Vogl^a ; ¹ ; ^{T.Vogl@em.uni-frankfurt.de} ; Ralf W. Bauer^a ; ¹ ; ^{ralfwbauer@aol.com}
• 关键词：CT angiography ; Aorta ; High-pitch CT ; Dual-source CT ; Bolus geometry
• 刊名：European Journal of Radiology
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：82
• 期：6
• 页码：1028-1033
• 全文大小：1321 K

文摘

Objective

To investigate the bolus geometry in high-pitch CT angiography (CTA) of the aorta without ECG synchronisation in comparison to single-source CT.

Methods

Overall 160 consecutive patients underwent CTA either in conventional single-source mode with a pitch of 1.2 (group 1), or in dual-source mode with a pitch of 3.0 (groups 2, 3 and 4) using different contrast media timings with bolus triggering at 140 HU (5 s, group 1; 10 s, group 2; 12 s, group 3; 14 s, group 4). Contrast material, saline flush, flow rate and kV/mAs settings were kept equal for optimum comparability. Aortic attenuation was measured along the z-axis of the patient at different anatomic landmarks and subjective image quality was compared.

Results

The most homogeneous enhancement of the aorta was reached with a delay of 10 s after reaching the trigger threshold. The imaging length was not significantly different, but the examination time was significantly (p < 0.001) shorter in the high-pitch group (7.7 s vs. 1.7 s for group 1 vs. 2, 3 and 4).

Conclusion

In high-pitch CT angiography using a start delay of 10 s after a trigger threshold of 140 HU in the descending aorta is reached, a homogenous contrast along the z-axis is accomplished.