Wei Chen, Presenter: Nothing to Disclose

Biao Lu MD, Abstract Co-Author: Nothing to Disclose

Zhaoqi Zhang, Abstract Co-Author: Nothing to Disclose

Rui Wang, Abstract Co-Author: Nothing to Disclose

To compare radiation dose and image quality between prospective and retrospective ECG gating CT angiography (CTA) using a dual-source computed tomography (DSCT) scanner.

Ninety infants with suspected congenital heart disease were enrolled, and randomly divided into two groups. Forty-five infants in research group (average age:5.60m,weight: 6.51kg,height: 59.48cm,heart rate : 121.89 bpm) underwent CTA using prospective ECG-gating ( 80 kV ), while 45 infants (average age: 6.28m, weight:6.17kg, height:58.95cm, heart rate 126.10 bpm) in control group underwent CTA using retrospective ECG-gating ( 80 kV ). Two experienced radiologists quantitatively evaluated the image quality. The imaging noise was measured at the same time for the two sets .The CTDI、DLP values were recored. Student T-test was performed for quality scores, the nosie measurements and the effective dose measurements from two sets.

There is no statistical difference in image quality between A and B group (H=0.098, P>0.05). The image noise of A and B groups were 13.25±1.27，13.51±1.41, respectively. In addition, the CTDI, DLP, and effective dose of A and B group was 2.70±0.75 mGY, 29.55±10.17 mGy/cm, 0.41±0.14 mSv; 3.81±1.03 mGY, 51.57± 14.81 mGy/cm, 0.72±0.20 mSv, respectively. Comparing prospective ECG-gating with retrospective ECG-gating, 44%.of effective dose was saved.  

Prospective ECG gating CTA can effectively reduce the infant’s radiation dose without compromising image quality.  

DSCT prospective ECG gating CTA can used in clinical widely with reducing the radation dose and without compromising image quality.  

Chen, W, Lu, B, Zhang, Z, Wang, R, The Feasibility of Prospective ECG-gated Dual-Source CT in Infants with Congenital Heart Disease  .  Radiological Society of North America 2011 Scientific Assembly and Annual Meeting, November 26 - December 2, 2011 ,Chicago IL. http://archive.rsna.org/2011/11016974.html