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KMID : 1131320150170020133
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Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 2 p.133 ~ p.146
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Evaluation of Effectiveness of IBR(Intellignet Boundary Registration) to correct mis-registration artifact in Coronary artery CT
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Lim Seung-Hyeon
Lee Sang-Woo
Kim Seon-Ki
Suh Dae-Keon
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Abstract
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Purpose: This is to introduce IBR (Intelligent Boundary Registration), the newly offered function which can correct mis-registration artifacts in the course of coronary arteries examination and survey its influence by comparing and analyzing relevant images with and without the IBR application.
Materials and method : From January. 1,2015 to January. 30, 2015, We examined the coronary arteries in our health care center among 211 asymptomatic patients in total. we selected the examines 60 patients out of patients who have arrhythmia and the others who have shown dramatic change of heart rate escaping from the pitch applicable area recommended by the equipment supplier. we respectively examined 30 people by snapshot pulse mode and by snapshot segment mode. As for the phantom survey, in order to study IBR effects imaging mis-registration artifacts in the vessel according to the different electrocardiogram, we tested a correction study with Artery Block’s Vessel Line and also kV and mA sensitivity analysis under the different conditions over the prospective ECG-gating and the retrospective ECG-gating. By dividing three major arteries of heart, RCA, LAD and LCX apart, our clinical study tried to identify whether it will cause mis-registration artifacts and correct them, if any by applying IBR.
Result : Phantom study resulted in mis-registration artifacts irrelevant to both over the prospective ECG-gating and retrospective ECG-gating. In retrospective ECG-gating, vessel 1, 2 which included highest iodine concentration of 10 mg/cm3 were applied IBR all the conditions. vessel 3,4 which included iodine concentration of 2.5 mg/cm3 were not applied two click AVA and were unable to evaluate IBR. vessel 5 which included iodine concentration 5 mg/cm3 was not applied two click AVA under 120 kV, 50 mA measured 242 HU. vessel 6 which included iodine concentration of 5 mg/cm3 were applied IBR all the conditions. in periphery area of vessel line, mis-registration artifact was not corrected by IBR compared to the center of it. And as for the mis-registration artifact of vessel line from prospective ECG-gating, IBR was not applicable irrelevant to the terms and conditions of diameter and dosimeter of the vessel. Clinical study showed the mis-registration artifact was corrected by 86.6%, 86.6% and 80% respectively in the proximal, middle and distal RCA and 86.6%, 90%, 86.6% in the proximal, middle and distal LAD and 93.3%, 86.6%, 90% in the proximal, middle and distal LCX in prospective ECG-gating, if IBR applied. In retrospective ECG-gating, it was corrected by 100%, 100% and 93.3% for the proximal, middle and distal RCA respectively and 96.6%, 100% and 90% for LAD while 100%, 100% and 96.6% for LCX. It is also identified that the artifact in the proximal and middle is corrected better than in the distal which has narrow blood vessel, and it is more twisted, if applied IBR exceptionally,
Conclusion : In coronary arteries examination, proper application of IBR can help diagnosis of cardiopathy and improve the image quality by correcting mis-registration artifacts, we recommend to use it actively.
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KEYWORD
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Intelligent Boundary Registration, mis-registration artifact, Coronary artery
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