Image quality in low-dose coronary computed tomography angiography with a new high-definition CT scanner

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• 作者：Egle Kazakauskaite (1)
  Lars Husmann (1)
  Julia Stehli (1)
  Tobias Fuchs (1)
  Michael Fiechter (1) (2)
  Bernd Klaeser (1)
  Jelena R. Ghadri (1)
  Catherine Gebhard (1)
  Oliver Gaemperli (1)
  Philipp A. Kaufmann (1) (2)
  
• 关键词：High ; definition computed tomography ; Coronary angiography ; Image quality ; Radiation dose
• 刊名：The International Journal of Cardiovascular Imaging (formerly Cardiac Imaging)
• 出版年：2013
• 出版时间：February 2013
• 年：2013
• 卷：29
• 期：2
• 页码：471-477
• 全文大小：437KB
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• 作者单位：Egle Kazakauskaite (1)
  Lars Husmann (1)
  Julia Stehli (1)
  Tobias Fuchs (1)
  Michael Fiechter (1) (2)
  Bernd Klaeser (1)
  Jelena R. Ghadri (1)
  Catherine Gebhard (1)
  Oliver Gaemperli (1)
  Philipp A. Kaufmann (1) (2)
  
  1. Cardiac Imaging, University Hospital Zurich, Ramistrasse 100, NUK C 42, 8091, Zurich, Switzerland
  2. Zurich Center of Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland
  
• ISSN：1573-0743

文摘

A new generation of high definition computed tomography (HDCT) 64-slice devices complemented by a new iterative image reconstruction algorithm—adaptive statistical iterative reconstruction, offer substantially higher resolution compared to standard definition CT (SDCT) scanners. As high resolution confers higher noise we have compared image quality and radiation dose of coronary computed tomography angiography (CCTA) from HDCT versus SDCT. Consecutive patients (n?=?93) underwent HDCT, and were compared to 93 patients who had previously undergone CCTA with SDCT matched for heart rate (HR), HR variability and body mass index (BMI). Tube voltage and current were adapted to the patient’s BMI, using identical protocols in both groups. The image quality of all CCTA scans was evaluated by two independent readers in all coronary segments using a 4-point scale (1, excellent image quality; 2, blurring of the vessel wall; 3, image with artefacts but evaluative; 4, non-evaluative). Effective radiation dose was calculated from DLP multiplied by a conversion factor (0.014?mSv/mGy?×?cm). The mean image quality score from HDCT versus SDCT was comparable (2.02?±?0.68 vs. 2.00?±?0.76). Mean effective radiation dose did not significantly differ between HDCT (1.7?±?0.6?mSv, range 1.0-.7?mSv) and SDCT (1.9?±?0.8?mSv, range 0.8-.5?mSv; P?=?n.s.). HDCT scanners allow low-dose 64-slice CCTA scanning with higher resolution than SDCT but maintained image quality and equally low radiation dose. Whether this will translate into higher accuracy of HDCT for CAD detection remains to be evaluated.