Comparative study of coronary CTA using 64 MSCT and delayed-enhanced MRI in evaluating the volume of myocardial infarction
WANG Xin-jiang1, CAI Zu-long1, ZHAO Hong1, CHENG Liu-quan1, JIA Nan1, LI Zheng-fang1, YANG Li1, SU Ping2, LIU Jian-jun2
1. Department of Radiology, General Hospital of PLA, Beijing 100853, China;2. Department of Radiology, Urumqi General Military Hospital of Lanzhou, Urumqi 830000, China
Abstract：Objective: To assess myocardial hypo-enhancement in demonstrating the myocardial infarction(MI) in coronary artery CT angiography(CTA) performed by 64-MSCT and to compare the results with delayed-enhanced MRI(DE-MRI). Materials and Methods: Twenty-three patients suspected of MI underwent both 64-MSCT and DE-MRI scanning. On 64-MSCT scanning, 60~85ml iodine contrast medium(370mgI/ml) were injected and flushed with 40ml saline, injection velocity is 4~5ml/s. The short axis of the left ventricle was reconstructed with 8mm slice thickness. On MRI scanning, contiguous left ventricular short-axis views were obtained 10 to 15min after the administration of gadopentetate dimeglumine 0.2mmol/kg. The hypo-enhanced volume from CTA and delay-enhanced volume from DE-MRI were measured and compared. Results: The MI volume measured by 64-MSCT and DE-MRI were (7.66±5.95)ml and (15.33±9.71)ml, respectively. The hypo-enhanced volume measured by 64-MSCT was correlated with that measured by DE-MRI(r=0.727). Conclusions: The MI demonstrated as hypo-enhanced region on CTA was underestimated compared to hyper-enhanced volume by DE-MRI.
2009, Vol. 20 
