Iterative reconstruction reduces abdominal CT dose

作者：Martinsen Anne Catrine Traegde^*; Saether Hilde Kjernlie; Hol Per Kristian; Olsen Dag Rune; Skaane Per

来源：European Journal of Radiology, 2012, 81(7): 1483-1487.

DOI：10.1016/j.ejrad.2011.04.021

• Computed tomography (CT)
• Radiation exposure
• Computed tomography (CT) image processing
• Computed tomography (CT) image quality
• Abdomen
• Iterative reconstruction

Objective: In medical imaging, lowering radiation dose from computed tomography scanning, without reducing diagnostic performance is a desired achievement. Iterative image reconstruction may be one tool to achieve dose reduction. This study reports the diagnostic performance using a blending of 50% statistical iterative reconstruction (ASIR) and filtered back projection reconstruction (FBP) compared to standard FBP image reconstruction at different dose levels for liver phantom examinations. %26lt;br%26gt;Methods: An anthropomorphic liver phantom was scanned at 250, 185, 155, 140, 120 and 100 mA s, on a 64-slice GE Lightspeed VCT scanner. All scans were reconstructed with ASIR and FBP. Four readers evaluated independently on a 5-point scale 21 images, each containing 32 test sectors. In total 672 areas were assessed. ROC analysis was used to evaluate the differences. %26lt;br%26gt;Results: There was a difference in AUC between the 250 mA s FBP images and the 120 and 100 mA s FBP images. ASIR reconstruction gave a significantly higher diagnostic performance compared to standard reconstruction at 100 mA s. %26lt;br%26gt;Conclusion: A blending of 50-90% ASIR and FBP may improve image quality of low dose CT examinations of the liver, and thus give a potential for reducing radiation dose.

• 出版日期2012-7