Image Quality and Radiation Dose of CT Coronary Angiography with Automatic Tube Current Modulation and Strong Adaptive Iterative Dose Reduction Three-Dimensional AIDR3DReport as inadecuate




Image Quality and Radiation Dose of CT Coronary Angiography with Automatic Tube Current Modulation and Strong Adaptive Iterative Dose Reduction Three-Dimensional AIDR3D - Download this document for free, or read online. Document in PDF available to download.

Purpose

To investigate image quality and radiation dose of CT coronary angiography CTCA scanned using automatic tube current modulation ATCM and reconstructed by strong adaptive iterative dose reduction three-dimensional AIDR3D.

Methods

Eighty-four consecutive CTCA patients were collected for the study. All patients were scanned using ATCM and reconstructed with strong AIDR3D, standard AIDR3D and filtered back-projection FBP respectively. Two radiologists who were blinded to the patients- clinical data and reconstruction methods evaluated image quality. Quantitative image quality evaluation included image noise, signal-to-noise ratio SNR, and contrast-to-noise ratio CNR. To evaluate image quality qualitatively, coronary artery is classified into 15 segments based on the modified guidelines of the American Heart Association. Qualitative image quality was evaluated using a 4-point scale. Radiation dose was calculated based on dose-length product.

Results

Compared with standard AIDR3D, strong AIDR3D had lower image noise, higher SNR and CNR, their differences were all statistically significant P<0.05; compared with FBP, strong AIDR3D decreased image noise by 46.1%, increased SNR by 84.7%, and improved CNR by 82.2%, their differences were all statistically significant P<0.05 or 0.001. Segments with diagnostic image quality for strong AIDR3D were 336 100.0%, 486 96.4%, and 394 93.8% in proximal, middle, and distal part respectively; whereas those for standard AIDR3D were 332 98.8%, 472 93.7%, 378 90.0%, respectively; those for FBP were 217 64.6%, 173 34.3%, 114 27.1%, respectively; total segments with diagnostic image quality in strong AIDR3D 1216, 96.5% were higher than those of standard AIDR3D 1182, 93.8% and FBP 504, 40.0%; the differences between strong AIDR3D and standard AIDR3D, strong AIDR3D and FBP were all statistically significant P<0.05 or 0.001. The mean effective radiation dose was 2.55±1.21 mSv.

Conclusion

Compared with standard AIDR3D and FBP, CTCA with ATCM and strong AIDR3D could significantly improve both quantitative and qualitative image quality.



Author: Hesong Shen , Guochao Dai , Mingyue Luo , Chaijie Duan, Wenli Cai, Dan Liang, Xinhua Wang, Dongyun Zhu, Wenru Li, Jianping Qiu

Source: http://plos.srce.hr/



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