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KMID : 1149020170190010045
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Journal of Korean Society of Computed Tomographic Technology
2017 Volume.19 No. 1 p.45 ~ p.52
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Quantitative Evaluation of Coronary Artery Diameter : Effect of CT scan modes and Heart rate
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Hwang Jeong-Hoon
Park Jin-Seok
Kim Jun-Su
Nam Yoon-Chul
Kim Moon-Chan
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Abstract
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Purpose : To evaluate the coronary lumen area and roundness for coronary CT angiography with the change of scan mode and heart rate (HR) which are significant factors affecting motion artifact and diagnostic accuracy.
Materials and Methods : All CT scans were performed on SOMATOM Definition Flash (Siemens) with a cardiac motion simulating phantom (MOCOMO, JP) attached 400HU solid phantom of 3 and 4mm diameter. The phantom was scanned at 0(static) for reference and HR simulated of 50-100 beat/min with sequence, helical, high pitch scan mode and reconstructed at 45% and 75% phase and 60% start phase of the R_R cycle. The mean area and roundness of scanned images were analyzed by using Image J software. Statistical analysis was performed to T-test and ANOVA by using SPSS software.
Results : As increased HR, the error value of the mean area of 3mm and 4mm phantom were the smallest about 4.9% and 2.9% in helical mode 45%, and followed sequence mode 45%, helical mode 75%, sequence mode 75%, high pitch mode. The error value of the mean roundness were the smallest about 2.1% and 2.1% in helical mode 45%, and there was no significant difference among the other scan modes. For the comparison of scan modes, the error value of the mean area was the smallest about 9.2% in helical mode 75% and followed sequence mode 75%, high pitch spiral scan mode. The error value of the mean roundness was the smallest about 3.4% in sequence mode 75% and followed helical mode 75%, high pitch spiral scan mode(P<.05 for all).
Conclusions : It demonstrates 45% phase of helical is the most appropriate for high HR patients and 75% phase of helical is the most appropriate for low HR patients. If using proper scan mode by HR, it could be helpful to accurate diagnosis for cardiovascular patients.
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KEYWORD
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Area, Roundness, Cardiac motion simulating phantom (MOCOMO, JP)
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