University Politecnica delle Marche, Via Tronto 10/A, 60126, Ancona, Italy.
Department of Radiological Sciences, Division of Special and Pediatric Radiology, University Hospital Ospedali Riuniti "Umberto I - GM Lancisi - G Salesi", Via Conca 71, 60126, Ancona, Italy.
Radiol Med. 2019 Aug;124(8):745-752. doi: 10.1007/s11547-019-01037-5. Epub 2019 Apr 19.
To provide an overview on dose reduction and image quality after the installation of a third-generation dual-source CT (dsCT) in a Pediatric Radiology Department.
We included pediatric patients (< 20 years old) undergoing CT for oncological staging (neck, chest and abdomen) or low-dose chest CT for lung diseases. Each of these two groups were further divided in two age groups (≤ or > 10 years old) including patients scanned in the same period of two consecutive years, in 2017 with a 16-row LightSpeed CT (GE Healthcare) or in 2018 with a Somatom Force dsCT (Siemens Healthineers). Technical parameters such as kVp, mAs, slice thickness, exposure times and dose indicators were retrieved and compared. Image quality was evaluated in consensus by two radiologists on a five-point semiquantitative scale. Nonparametric tests were used.
In oncological patients, significantly lower kVp and tube current with better image quality were achieved with the dsCT. Radiation dose (total DLP) was 5-6 times lower with dsCT, thanks also to virtual non-contrast images. In low-dose chest CT, the frequent use of tin filter required higher tube current; a total DLP 3 times lower was achieved with dsCT in patients ≤ 10 years old. The image quality was better with the dsCT in low-dose chest CT protocols.
The third-generation dsCT provides high-quality images with reduced motion artifacts at lower dose.
介绍在儿科放射科安装第三代双源 CT（dsCT）后剂量降低和图像质量的情况。
我们纳入了接受 CT 进行肿瘤分期（颈部、胸部和腹部）或用于肺部疾病的低剂量胸部 CT 的儿科患者。这两组患者进一步分为两个年龄组（≤10 岁或>10 岁），包括在连续两年的同一时期接受检查的患者，2017 年使用 16 排 LightSpeed CT（GE Healthcare）或 2018 年使用 Somatom Force dsCT（西门子医疗）。检索并比较了千伏（kVp）、毫安秒（mAs）、层厚、曝光时间和剂量指标等技术参数。两名放射科医生以五分制半定量评分进行了共识性的图像质量评估。使用了非参数检验。
在肿瘤患者中，dsCT 实现了更低的 kVp 和管电流，同时保持了更好的图像质量。由于虚拟非对比图像的应用，dsCT 使辐射剂量（总剂量长度乘积）降低了 5-6 倍。在低剂量胸部 CT 中，由于经常使用锡滤器，需要更高的管电流；在≤10 岁的患者中，dsCT 可使总剂量长度乘积降低 3 倍。在低剂量胸部 CT 方案中，dsCT 的图像质量更好。
第三代 dsCT 可在降低剂量的同时提供高质量的图像，减少运动伪影。
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