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KMID : 1149020180200020023
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Journal of Korean Society of Computed Tomographic Technology
2018 Volume.20 No. 2 p.23 ~ p.30
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A Study on the Image Quality improvement of the Coronary artery CT Angiography using the Lowest Heart Rate
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Yoo Ji-Eun
Lee Jong-Min
Nam Tae-Hyun
Gwon Sun-Ahn
Dae Chang-Min
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Abstract
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Purpose: The aim of this study is finding the lowest heart rate point during breath holding time in Coronary Artery CT Angiography (CCTA) and create a new protocol to improve image quality without motion artifact.
Material and Methods: We investigated 674 patients who underwent conventional coronary CT angiography to observe heart rate changes during their breath holding time, from September 2015 to December 2017. After our investigation, total of 172 patients take Coronary Scan with our new protocol which is starting scan at the point of lowest heart rate point while their breath holding time, from August 2017 to January 2018. 256 MDCTs and a 128 MDCT were used for Coronary Scan with each protocol which is appropriately modified by their technical specification. A 3D workstation, Extended Brilliance Workspace v4.5 (EBW 4.5), is used for analyzing heart rate variation during the scanned time.
Result: The lowest heart rate of the coronary scan was 4.5 seconds after the breath holding. Based on this factor, we compared the image quality of 172 patients examined using existing protocols and 125 patients examined using a protocol that changed the scan start time to 4.5 seconds after breath holding. As a result, it was estimated that the images tested with our new protocols are clinically more valuable for diagnosis of coronary artery with motion free images than the existing protocols.
Conclusion: Scanning coronary scan at the point of lower heart rate interval is very important in improving image quality without motion artifact. Efforts to get better heart images in the clinical environment should continue and this research could prove to be of some use.
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KEYWORD
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CCTA, Heart Rate (HR), image quality, breath hold
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