Restricting motion effects in CT coronary angiography

• Published in: British journal of radiology Vol. 92; no. 1103; p. 20190384
• Main Authors: Kashani, Hany, Wright, Graham, Ursani, Ali, Liu, Garry, Hashemi, Masoud, Paul, Narinder
• Format: Journal Article
• Language: English
• Published: England The British Institute of Radiology 01.11.2019
• Subjects: Algorithms; Analysis of Variance; Computed Tomography Angiography - standards; Coronary Artery Disease - diagnostic imaging; Coronary Artery Disease - physiopathology; Heart Rate - physiology; Humans; Movement; Phantoms, Imaging; Pilot Projects; Prospective Studies; Radiographic Image Enhancement - methods
• ISSN: 0007-1285; 1748-880X; 1748-880X
• DOI: 10.1259/bjr.20190384

Evaluation of coronary CT image blur using multi segment reconstruction algorithm. Cardiac motion was simulated in a Catphan. CT coronary angiography was performed using 320 × 0.5 mm detector array and 275 ms gantry rotation. 1, 2 and 3 segment reconstruction algorithm, three heart rates (60, 80 and 100bpm), two peak displacements (4, 8 mm) and three cardiac phases (55, 35, 75%) were used. Wilcoxon test compared image blur from the different reconstruction algorithms. Image blur for 1, 2 and 3 segments in: 60 bpm, 75% R R interval and 8 mm peak displacement: 0.714, 0.588, 0.571 mm (1.18, 0.6, 0.4 mm displacement) 80 bpm, 35% R R interval and 8 mm peak displacement: 0.869, 0.606, 0.606 mm (1.57, 0.79,0.52 mm displacement) 100 bpm, 35% R R interval and 4 mm peak displacement: 0.645, 0.588, 0.571 mm (0.98, 0.49, 0.33 mm displacement). The median image blur overall for 1 and 2 segments was 0.714 mm and 0.588 mm respectively ( < 0.0001). Two-segment reconstruction significantly reduces image blur. Multisegment reconstruction algorithms during CT coronary angiography are a useful method to reduce image blur, improve visualization of the coronary artery wall and help the early detection of the plaque.