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近年,超高精細CT(ultra-high resolution CT:U-HRCT)が臨床にも使用できるようになった。U-HRCTスキャナは,0.25mm×160列・1,792チャネルの検出器を備え,従来のCTより高い空間分解能の画像を提供することが可能であり,肺についても病変の描出能の改善が報告されている1)。
We compared ultra-high-resolution CT images reconstructed with Hybrid Iterative Reconstruction(HIR)(AIDR3D-FC52)and Deep Learning Reconstruction(DLR)(AiCE-body)quantitatively and qualitatively. Noise for DLR images was significantly smaller than those for HIR. The extent of each lesion was almost the same between two kinds of CT images. The peripheral bronchiectasis and intralobular abnormalities were easily recognized in DLR. The score of image quality in DLR was higher than those in HIR. DLR can reduce image noise keeping with sharpness of the peripheral lung structures. Ultra-high-resolution CT using DLR is useful to evaluate diffuse lung diseases.
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