Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.
Department of Radiology, Boramae Medical Center, Seoul 156-707, Korea.
Korean J Radiol. 2014 Nov-Dec;15(6):739-45. doi: 10.3348/kjr.2014.15.6.739. Epub 2014 Nov 7.
To compare the image quality of shoulder CT arthrography performed using 120 kVp and 140 kVp protocols.
Fifty-four CT examinations were prospectively included. CT scans were performed on each patient at 120 kVp and 140 kVp; other scanning parameters were kept constant. Image qualities were qualitatively and quantitatively compared with respect to noise, contrast, and diagnostic acceptability. Diagnostic acceptabilities were graded using a one to five scale as follows: 1, suboptimal; 2, below average; 3, acceptable; 4, above average; and 5, superior. Radiation doses were also compared.
Contrast was better at 120 kVp, but noise was greater. No significant differences were observed between the 120 kVp and 140 kVp protocols in terms of diagnostic acceptability, signal-to-noise ratio, or contrast-to-noise ratio. Lowering tube voltage from 140 kVp to 120 kVp reduced the radiation dose by 33%.
The use of 120 kVp during shoulder CT arthrography reduces radiation dose versus 140 kVp without significant loss of image quality.
比较 120 kVp 和 140 kVp 协议下肩关节 CT 关节造影的图像质量。
前瞻性纳入 54 例 CT 检查。对每位患者均行 120 kVp 和 140 kVp 扫描；其他扫描参数保持不变。从噪声、对比度和诊断可接受性方面对图像质量进行定性和定量比较。诊断可接受性使用 1 到 5 的等级进行评分，如下所示：1. 差；2. 低于平均水平；3. 可接受；4. 高于平均水平；5. 优秀。还比较了辐射剂量。
120 kVp 时对比度更好，但噪声更大。在诊断可接受性、信噪比或对比噪声比方面，120 kVp 和 140 kVp 方案之间无显著差异。将管电压从 140 kVp 降低至 120 kVp 可使辐射剂量降低 33%。
与 140 kVp 相比，在肩关节 CT 关节造影中使用 120 kVp 可降低辐射剂量，而图像质量无明显损失。
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