Pinggui Lei, Presenter: Nothing to Disclose

Xiaoying Wang MD, Abstract Co-Author: Nothing to Disclose

Yufeng Xu, Abstract Co-Author: Nothing to Disclose

He Wang MD, Abstract Co-Author: Research Grant, General Electric Company

Xiaochao Guo MD, Abstract Co-Author: Nothing to Disclose

Jianxin Liu, Abstract Co-Author: Nothing to Disclose

The purpose of this study was to evaluate the image quality and image noise of artery CT angiography with iterative reconstructions which based on the original data from dual-source dual-energy CT.

Fourteen consecutive patients underwent dual-energy (DE) renal artery CTA examination [Somatom Definition FLASH, (Siemens Healthcare, Germany)] were analyzed retrospectively. Tube voltage 80 kV and Sn140kV; tube current 250mAs and 106mAs; collimation 128×0.6mm. Data sets were reconstructed with Sinogram Affirmed Iterative Reconstruction (SAFIRE) and filtered back projection (FBP) base on original data.CTDIvol and SSDE were recorded and calculated. Image quality was evaluated by two experienced radiologists. For qualitative assessment, the whole quality of imaging, detail quality of imaging (sharpness of main renal artery and segmental vessels, segmental vessels displayed in MPR and MIP) were evaluated with 5 scale method (1=poor to 5=excellent). For quantitative assessment, attenuation values were measured in the vascular lumen of aorta, renal arteries and erector spinae major at almost same level, and contrast-to-noise ratio (CNR), signal-to-noise ratio (SNR) were calculated.

The mean value of CTDIvol and SSDE of renal CTA were (10.15±2.32) mGy and (12.93±1.82) mGy. There was significant difference in the whole imaging quality between 2 groups (Z=-3.61, P<0.05). There was no significant difference in the sharpness of vessels between the 2 groups(Z=-2.00, P=0.05); Whereas the segmental vessels displayed in MPR and MIP were not statistically different(Z=-0.00, P＞0.05; Z=-0.00, P＞0.05), respectively. The attenuation values of abdominal aorta and renal artery in two groups were [(211±34) HU vs. (213±34) HU, P＞0.05] and [(196±38) HU vs. (193±36) HU, P＜0.05). The attenuation values of erector spinae in two groups were [(53±6) HU vs. (53±5) HU, P＞0.05]. The CNR and SNR in two groups were (14±6 vs. 9±4, P＜0.05) and (19±7 vs. 13±5, P＜0.05).There was significant difference in standard deviation in two groups (10±2 vs. 16±3, P＜0.05). 

Compared with standard FBP reconstruction, SAFIRE improve image quality and has the potential to decrease radiation dose.

Compare with FBP, SAFIRE reconstruction can achive better image quality, which help its clinical diagnosis and treatment.

Lei, P, Wang, X, Xu, Y, Wang, H, Guo, X, Liu, J, The Comparative Study on Image Quality of Renal Artery CT Angiography by Iterative Reconstructions and Filtered Back Projection.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14013245.html