Lee Han Na, Kim Jung Im, Shin So Youn
Department of Radiology, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul, Republic of Korea.
Department of Radiology, Kyung Hee University Hospital, College of Medicine, Kyung Hee University, Seoul, Republic of Korea.
Medicine (Baltimore). 2020 Jun 5;99(23):e20543. doi: 10.1097/MD.0000000000020543.
An axial-volume scan with adaptive statistical iterative reconstruction-V (ASIR-V) is newly developed. Our goal was to identify the influence of axial-volume scan and ASIR-V on accuracy of automated nodule volumetry.An "adult' chest phantom containing various nodules was scanned using both helical and axial-volume modes at different dose settings using 256-slice CT. All CT scans were reconstructed using 30% and 50% blending of ASIR-V and filtered back projection. Automated nodule volumetry was performed using commercial software. The image noise, contrast-to-noise ratio (CNR), and signal-to-noise ratio (SNR) were measured.The axial-volume scan reduced radiation dose by 19.7% compared with helical scan at all radiation dose settings without affecting the accuracy of nodule volumetric measurement (P = .375). Image noise, CNR, and SNR were not significantly different between two scan modes (all, P > .05).The use of axial-volume scan with ASIR-V achieved effective radiation dose reduction while preserving the accuracy of nodule volumetry.
一种新开发的具有自适应统计迭代重建-V（ASIR-V）的轴向容积扫描技术。我们的目标是确定轴向容积扫描和ASIR-V对自动结节体积测量准确性的影响。使用256层CT在不同剂量设置下，分别采用螺旋和轴向容积模式对一个包含各种结节的“成人”胸部体模进行扫描。所有CT扫描均采用30%和50%混合的ASIR-V和滤波反投影进行重建。使用商业软件进行自动结节体积测量。测量图像噪声、对比噪声比（CNR）和信噪比（SNR）。在所有辐射剂量设置下，轴向容积扫描与螺旋扫描相比，辐射剂量降低了19.7%，且不影响结节体积测量的准确性（P = 0.375）。两种扫描模式下的图像噪声、CNR和SNR无显著差异（均P > 0.05）。使用带有ASIR-V的轴向容积扫描在保持结节体积测量准确性的同时实现了有效的辐射剂量降低。
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