Notification of abstract acceptance
announced via E-mail on July 31st.
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Oct. 18 (Thu)  203 Room - SS12 CV
17:10-17:20 [SS 12 CV-07] 
Free-breathing CCTA using 320-detector CT: An initial experience
   
Speaker Min Kyoung Park (Dong-a University Medical Center)
Authors Min Kyoung Park,Ki-Nam Lee1,Eun-Ju Kang1,Jongmin Lee2
Affiliation Dong-a University Medical Center1,Kyeongpook National University Hospital2
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PURPOSE:
A hypothesis was established that high temporal resolution CT could acquire ECG-gated cardiac CT during quite respiration without significant deterioration of image quality. In this study, the feasibility of free-breathing coronary computed tomography angiography (CCTA) was evaluated in adults using 320-detector CT scanner.

MATERIALS AND METHODS:
In 74 patients who underwent CCTA from September 2011 to December 2011, 37 CCTA examinations were performed during free-breathing, and the remaining 37 CCTA examinations were produced using the standard breath-holding method. The quality scores for 16 segments of all coronary arteries larger than 1mm luminal diameter were analyzed and defined as: 1 (excellent), 2 (good), and 3 (poor). The signal to noise ratio (SNR), contrast to noise ratio (CNR), and effective radiation dose of each image were compared between the two methods.

RESULTS:
No significant difference in demographic data was observed between the two subject groups. A total of 995 coronary artery segments were available for evaluation, and no significant differences were observed in subjective image quality between the free-breathing and breath-holding scan methods (1.02 ¡¾0.05 vs. 1.03 ¡¾0.05, respectively; P = 0.56). The SNR and CNR were not significantly different between the two methods (SNR: 14.0 ¡¾2.9 vs. 13.8 ¡¾2.2, respectively; CNR in left main coronary artery: 16.9 ¡¾3.2 vs. 16.6 ¡¾2.7, respectively). The overall mean effective radiation dose revealed no significant difference between the two methods.

CONCLUSION:
Free-breathing CCTA, using a 320-detector CT scanner showed no significant difference in image quality compared to the standard breath-holding CCTA. During the CCTA for patients with difficulty in holding their breath or with marked apnea-related heart rate variability, the free-breathing CCTA during a single heart beat can be an acceptable solution.

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