Impact on image quality and radiation dose of third-generation dual-source computed tomography of the coronary arteries

• Verfasst von: Apfaltrer, Georg [VerfasserIn]
• Verfasst von: Dutschke, Anja [VerfasserIn]
• Verfasst von: Apfaltrer, Paul [VerfasserIn]
• Titel: Impact on image quality and radiation dose of third-generation dual-source computed tomography of the coronary arteries
• Verf.angabe: Georg Apfaltrer, Dieter H. Szolar, Eric Wurzinger, Richard A. P. Takx, John W. Nance, Anja Dutschke, Sebastian Tschauner, Christian Loewe, Helmut Ringl, Erich Sorantin, and Paul Apfaltrer
• Jahr: 2017
• Umfang: 6 S.
• Fussnoten: Available online 25 January 2017 ; Gesehen am 28.06.2018
• Titel Quelle: Enthalten in: The American journal of cardiology
• Ort Quelle: Amsterdam [u.a.] : Elsevier, 1958
• Jahr Quelle: 2017
• Band/Heft Quelle: 119(2017), 8, Seite 1156-1161
• ISSN Quelle: 1879-1913
• DOI: doi:10.1016/j.amjcard.2016.12.028
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Adult
• Sach-SW: Aged
• Sach-SW: Aged, 80 and over
• Sach-SW: Cardiac-Gated Imaging Techniques
• Sach-SW: Coronary Angiography
• Sach-SW: Coronary Artery Disease
• Sach-SW: Electrocardiography
• Sach-SW: Female
• Sach-SW: Humans
• Sach-SW: Image Processing, Computer-Assisted
• Sach-SW: Male
• Sach-SW: Middle Aged
• Sach-SW: Radiation Dosage
• Sach-SW: Retrospective Studies
• Sach-SW: Tomography, X-Ray Computed
• K10plus-PPN: 1577003039

Abstract

The aim of this study was to assess the image quality (IQ) and radiation dose of third-generation dual-source computed tomography (CT) coronary angiography (cCTA) in comparison with 64-slice single-source CT. This retrospective study included 140 patients (73 men, mean age 62 ± 11 years) with low-to-intermediate probability of coronary artery disease who underwent either third-generation dual-source cCTA using prospectively electrocardiography-triggered high-pitch spiral acquisition (n = 70) (group 1) or retrospective electrocardiography-gated cCTA on a 64-slice CT system (n = 70) (group 2). Contrast-to-noise and signal-to-noise ratios were measured within the aorta and coronary arteries. Subjective IQ was assessed using a 5-point Likert scale. Effective dose was estimated using specific conversion factors. The contrast-to-noise ratio of group 1 was significantly higher than group 2 at all levels (all p <0.001). Signal-to-noise ratio of group 1 was also significantly higher than group 2 (p <0.05), except for the distal left circumflex artery. Subjective IQ for group 1 was rated significantly better than for group 2 (median score [25th to 75th percentile]: 1 [1 to 2] vs 2 [2 to 3]; p <0.001). The median effective dose was 1.55 mSv (1.09 to 1.88) in group 1 versus 12.29 mSv (11.63 to 14.36) in group 2 (p <0.001) which corresponds to a mean radiation dose reduction of 87.4%. In conclusion, implementation of third-generation dual-source CT system for cCTA leads to improved IQ with significant radiation dose savings.