Determining the proportion of coronary segments assessable on 16-slice CT coronary angiography: A brief report

K. H. Soon, N. Cox, I. Chaitowitz, K. W. Bell, D. Eccleston, A. M. Kelly, Y. Lim

Research output: Contribution to journalArticlepeer-review


Computed tomography coronary angiography (CT-CA) is becoming a popular non-invasive coronary imaging method. We aimed to determine the proportion of coronary segments assessable on a 16-slice CT in comparison with conventional selective coronary angiography (SCA). We identified all patients who had both 16-slice CT-CA and recent SCA (less than 12 months) from March 2004 to July 2005. Two CT reporters blinded to SCA independently classified coronary segment assessability on CT-CA. A cardiologist blinded to CT findings classified assessability of coronary segments on SCA. Data were analysed using descriptive statistics and proportion of agreement. Ninety-five study pairs were included in the analysis. Of those, 1161 coronary segments were deemed assessable on SCA and 1103 segments (95%) were also assessable on CT-CA. Nonassessable segments on CT-CA were predominantly in the distal segments and branches of coronary arteries. Reasons for nonassessability were small calibre (48.3%), motion artefacts (20.7%) and poorly reconstructed segments (22.4%). The 16-slice CT was able to assess a high proportion of but not all coronary segments. Nonassessable segments were predominantly distal segments or branches of coronary arteries. Motion artefacts due to heart-rate changes, small calibre and poorly reconstructed images were main causes of nonassessability on 16-slice CT-CA.

Original languageEnglish (US)
Pages (from-to)139-142
Number of pages4
JournalAustralasian Radiology
Issue number2
StatePublished - Apr 2007


  • Coronary angiography
  • Multi-detector row computed tomography
  • Multislice computed tomography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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