title: Coronary artery visibility in free-breathing young children on non-gated chest CT: impact of temporal resolution.
abstract: BACKGROUND
  Dual-source CT allows scanning of the chest with high pitch and high temporal resolution, which can improve the detection of proximal coronary arteries in infants and young children when scanned without general anesthesia, sedation or beta-blockade.
  
  
  OBJECTIVE
  To compare coronary artery visibility between higher and standard temporal resolution.
  
  
  METHODS
  We analyzed CT images in 93 children who underwent a standard chest CT angiographic examination with reconstruction of images with a temporal resolution of 75 ms (group 1) and 140 ms (group 2).
  
  
  RESULTS
  The percentage of detected coronary segments was higher in group 1 than in group 2 when considering all segments (group 1: 27%; group 2: 24%; P = 0.0004) and proximal segments (group 1: 37%; group 2: 32%; P = 0.0006). In both groups, the highest rates of detection were observed for the left main coronary artery (S1) (group 1: 65%; group 2: 58%) and proximal left anterior descending coronary artery (S2) (group 1: 43%; group 2: 42%). Higher rates of detection were seen in group 1 for the left main coronary artery (P = 0.03), proximal right coronary artery (P = 0.01), proximal segments of the left coronary artery (P = 0.02) and proximal segments of the left and right coronary arteries (P = 0.0006).
  
  
  CONCLUSIONS
  Higher temporal resolution improved the visibility of proximal coronary arteries in pediatric chest CT.
authors: Department of Thoracic Imaging, Hospital Calmette (EA 2694), CHRU et Université de Lille, Boulevard Jules Leclerq, 59037 Lille Cedex, France.
authors: Alexandre
authors: A
authors: Bridoux
authors: Department of Thoracic Imaging, Hospital Calmette (EA 2694), CHRU et Université de Lille, Boulevard Jules Leclerq, 59037 Lille Cedex, France.
authors: Antoine
authors: A
authors: Hutt
authors: Department of Thoracic Imaging, Hospital Calmette (EA 2694), CHRU et Université de Lille, Boulevard Jules Leclerq, 59037 Lille Cedex, France.
authors: Jean-Baptiste
authors: JB
authors: Faivre
authors: Department of Research & Development in CT, Siemens Healthcare, Forchheim, Germany.
authors: Thomas
authors: T
authors: Flohr
authors: Department of Biostatistics, Université de Lille, Lille, France.
authors: Alain
authors: A
authors: Duhamel
authors: Department of Thoracic Imaging, Hospital Calmette (EA 2694), CHRU et Université de Lille, Boulevard Jules Leclerq, 59037 Lille Cedex, France.
authors: Julien
authors: J
authors: Pagniez
authors: Department of Thoracic Imaging, Hospital Calmette (EA 2694), CHRU et Université de Lille, Boulevard Jules Leclerq, 59037 Lille Cedex, France.
authors: Jacques
authors: J
authors: Remy
authors: Department of Thoracic Imaging, Hospital Calmette (EA 2694), CHRU et Université de Lille, Boulevard Jules Leclerq, 59037 Lille Cedex, France. martine.remy@chru-lille.fr.
authors: Martine
authors: M
authors: Remy-Jardin
mesh_terms: D002675:Child, Preschool; D017023:Coronary Angiography / Q000379:methods*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007223:Infant; D008297:Male; D015203:Reproducibility of Results; D012119:Respiration; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: Chest; Children; Computed tomographic angiography; Computed tomography; Dual-source computed tomography; Temporal resolution