视野大小对图像质量的影响：超高分辨率 CT 与常规高分辨率 CT 比较。
Influence of field of view size on image quality: ultra-high-resolution CT vs. conventional high-resolution CT.
机构信息
Department of Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita City, Osaka, 565-0871, Japan.
Department of Future Diagnostic Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita City, Osaka, 565-0871, Japan.
出版信息
Eur Radiol. 2020 Jun;30(6):3324-3333. doi: 10.1007/s00330-020-06704-0. Epub 2020 Feb 18.
OBJECTIVES
This study was conducted in order to compare the effect of field of view (FOV) size on image quality between ultra-high-resolution CT (U-HRCT) and conventional high-resolution CT (HRCT).
METHODS
Eleven cadaveric lungs were scanned with U-HRCT and conventional HRCT and reconstructed with five FOVs (40, 80, 160, 240, and 320 mm). Three radiologists evaluated and scored the images. Three image evaluations were performed, comparing the image quality with the five FOVs with respect to the 160-mm FOV. The first evaluation was performed on conventional HRCT images, and the second evaluation on U-HRCT images. Images were scored on normal structure, abnormal findings, and overall image quality. The third evaluation was a comparison of the images obtained with conventional HRCT and U-HRCT, with scoring performed on overall image quality. Quantitative evaluation of noise was performed by setting ROIs.
RESULTS
In conventional HRCT, image quality was improved when the FOV was reduced to 160 mm. In U-HRCT, image quality, except for noise, improved when the FOV was reduced to 80 mm. In the third evaluation, overall image quality was improved in U-HRCT over conventional HRCT at all FOVs. Noise of U-HRCT increased with respect to conventional HRCT when the FOV was reduced from 160 to 40 mm. However, at 240- and 320-mm FOVs, the noise of U-HRCT and conventional HRCT showed no differences.
CONCLUSIONS
In conventional HRCT, image quality did not improve when the FOV was reduced below 160 mm. However, in U-HRCT, image quality improved even when the FOV was reduced to 80 mm.
KEY POINTS
• Reducing the size of the field of view to 160 mm improves diagnostic imaging quality in high-resolution CT. • In ultra-high-resolution CT, improvements in image quality can be obtained by reducing the size of the field of view to 80 mm. • Ultra-high-resolution CT produces images of higher quality compared with conventional HRCT irrespective of the size of the field of view.
目的
本研究旨在比较视野（FOV）大小对超高分辨率 CT（U-HRCT）和常规高分辨率 CT（HRCT）图像质量的影响。
方法
对 11 具尸体肺进行 U-HRCT 和常规 HRCT 扫描，并采用 5 种 FOV（40、80、160、240 和 320mm）进行重建。由 3 名放射科医生对图像进行评估和评分。进行了 3 次图像评估，比较了 5 种 FOV 与 160mm FOV 的图像质量。第一次评估是在常规 HRCT 图像上进行的，第二次评估是在 U-HRCT 图像上进行的。对正常结构、异常发现和整体图像质量进行评分。第三次评估是对常规 HRCT 和 U-HRCT 获得的图像进行比较，对整体图像质量进行评分。通过设置 ROI 进行噪声的定量评估。
结果
在常规 HRCT 中，FOV 减小到 160mm 时，图像质量得到改善。在 U-HRCT 中，FOV 减小到 80mm 时，除噪声外，图像质量均得到改善。在第三次评估中，在所有 FOV 下，U-HRCT 的整体图像质量均优于常规 HRCT。当 FOV 从 160mm 减小到 40mm 时，U-HRCT 的噪声相对于常规 HRCT 增加。然而，在 240mm 和 320mm FOV 下，U-HRCT 和常规 HRCT 的噪声没有差异。
结论
在常规 HRCT 中，当 FOV 减小到 160mm 以下时，图像质量不会提高。然而，在 U-HRCT 中，即使 FOV 减小到 80mm，图像质量也会得到改善。
关键点
将视野尺寸减小到 160mm 可提高高分辨率 CT 的诊断成像质量。
在超高分辨率 CT 中，通过将视野尺寸减小到 80mm，可以获得图像质量的改善。
与常规 HRCT 相比，无论视野大小如何，超高分辨率 CT 都能产生更高质量的图像。
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