Image quality at low tube voltage (70 kV) and sinogram-affirmed iterative reconstruction for computed tomography in infants with congenital heart disease.
Image quality at low tube voltage (70 kV) and sinogram-affirmed iterative reconstruction for computed tomography in infants with congenital heart disease.
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DOI：
10.1007/s00247-015-3372-2
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发表时间：
2015-09
影响因子：
2.3
通讯作者：
Shibamoto Y
中科院分区：
文献类型：
--
作者：
Nakagawa M;Ozawa Y;Sakurai K;Shimohira M;Ohashi K;Asano M;Yamaguchi S;Shibamoto Y
较低的管电压对于 CT 血管造影有优势，例如提高对比度，评估先天性心脏病的低压 (70 kV) CT 的图像质量，以及正弦图确认的迭代重建提高图像质量的能力。使用双源 CT 对 46 名患有先天性心脏病的儿童（中位年龄：109 天）进行了检查。分别对 21 名和 25 名儿童在 80 kV 和 70 kV 下进行扫描。 80-kV 方案使用非离子碘造影剂 (300 mg I/ml)。对于 70-kV 方案，用盐水将造影剂稀释至 75% (225 mgI/mL)。通过提取位于降主动脉上的感兴趣区域的标准差，在每组的两个协议中测量图像噪声。然后，我们确定正弦图确认的迭代重建是否降低了 70 kV 时的图像噪声。 70 kV 时的噪声多于 80 kV 时的噪声（29±±12 vs 20±±4.8；P<±0.01）。经心电图证实的 4 级强度设置的迭代重建改善了 70 kV 组的噪声（20±±5.9；P<0.01）。 Sinogram 证实的迭代重建提高了先天性心脏病的 CT 图像质量。
Lower tube voltage has advantages for CT angiography, such as improved contrast To evaluate the image quality of low-voltage (70 kV) CT for congenital heart disease and the ability of sinogram-affirmed iterative reconstruction to improve image quality. Forty-six children with congenital heart disease (median age: 109 days) were examined using dual-source CT. Scans were performed at 80 kV and 70 kV in 21 and 25 children, respectively. A nonionic iodinated contrast medium (300 mg I/ml) was used for the 80-kV protocol. The contrast medium was diluted to 75% (225 mgI/mL) with saline for the 70-kV protocol. Image noise was measured in the two protocols for each group by extracting the standard deviations of a region of interest placed on the descending aorta. We then determined whether sinogram-affirmed iterative reconstruction reduced the image noise at 70 kV. There was more noise at 70 kV than at 80 kV (29 ± 12 vs 20 ± 4.8; P < 0.01). Sinogram-affirmed iterative reconstruction with grade 4 strength settings improved the noise (20 ± 5.9; P < 0.01) for the 70-kV group. Sinogram-affirmed iterative reconstruction improved the image quality of CT in congenital heart disease.