【摘 要】
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Purpose: To compare the image quality, visualization rate of coronary artery and diagnostic accuracy of 3 reconstruction algorithms: filtered back projection (FBP), hybrid iterative reconstruction (iD
【出 处】
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中华放射学学术大会2016、中华医学会第23次全国放射学学术大会暨中华医学会第24次全国影像技术学术大会
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Purpose: To compare the image quality, visualization rate of coronary artery and diagnostic accuracy of 3 reconstruction algorithms: filtered back projection (FBP), hybrid iterative reconstruction (iDose4 ) and iterative model reconstruction (IMR) at 80 kVp-tube-voltage 256-slice multi-detector CT angiography (CTA) in infants with congenital heart disease (CHD). Methods: Fifty-one infants with CHD, who underwent cardiac CTA in our institution between December 2014 and March 2015 were included. The effective radiation doses were calculated. Imaging data were reconstructed with FBP, iDose4 and IMR algorithms. The parameters of objective image quality (noise, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR)), subjective image quality (overall image quality, image noise and margin sharpness), coronary artery visibility and diagnostic accuracy were collected and compared for the three algorithms. Results: The mean effective dose was 0.61 ±0.32 mSv. Compared to FBP and iDose4, IMR had significantly lower noise (P<0.01), and higher scores for subjective image quality (P<0.01), as well as higher SNR &CNR values (P<0.01). Total coronary segments visualization were significantly higher for iDose4 than FBP (P =0.002), and IMR than FBP (P =0.025); whereas, there was no significant difference between iDose4 and IMR (P =0.397). There was no significant difference in the diagnostic accuracy among the FBP, iDose4 and IMR algorithms (c2 = 0.343, P=0.842). Conclusions: In infants with CHD who receive cardiac CTA, reconstruction algorithm of IMR yielded significantly improved objective and subjective image quality in comparison with FBP and iDose4. However, IMR did not improve diagnostic accuracy and coronary artery visibility as compared to iDose4.
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