Greess H, Lutze J, Nömayr A, Wolf H, Hothorn T, Kalender W A, Bautz W
Institute of Radiology, University of Erlangen, Maximiliansplatz 1, 91054 Erlangen, Germany.
Eur Radiol. 2004 Jun;14(6):995-9. doi: 10.1007/s00330-004-2301-9. Epub 2004 Mar 30.
The potential of online tube current modulation in subsecond multislice spiral CT (MSCT) examinations of children to reduce the dose without a loss in image quality is investigated in a controlled patient study. The dose can be reduced for oval patient sectional view without an increase in noise if the tube current is reduced where the patient diameter and, consequently, attenuation are small. We investigated a product version of an online control for tube current in a SOMATOM Sensation 4 (Siemens, Forchheim). We evaluated image quality, noise and dose reduction for examinations with online tube current modulation in 30 MSCT of thorax/abdomen and abdomen and compared mA s for tube current modulation to the mA s in standard weight-adapted children protocols. Image quality was rated as "very good," "good," "diagnostic" and "poor" in a consensus by three radiologists. Noise was assessed in comparison to 24 MSCT examinations without tube current modulation measured as SD in ROIs. The dose was reduced from 26 to 43% (mean 36%), depending on the patient's geometry and weight. In general, no loss of image quality was observed. Measured noise showed a decrease up to 26% and an increase up to 36%, although there was no decrease of image quality. Online tube current modulation is now used as a standard in MSCT at our institution. Dose in MSCT examinations of children can be reduced substantially in routine examinations by online tube current modulation without a loss of image quality.
在一项对照患者研究中，探讨了在线管电流调制在儿童亚秒级多层螺旋CT（MSCT）检查中降低剂量而不损失图像质量的潜力。如果在患者直径较小且因此衰减较小的部位降低管电流，则对于椭圆形患者断面视图可以降低剂量而不会增加噪声。我们在一台SOMATOM Sensation 4（西门子，福希海姆）上研究了一种管电流在线控制的产品版本。我们评估了30例胸部/腹部和腹部MSCT检查中采用在线管电流调制时的图像质量、噪声和剂量降低情况，并将管电流调制的毫安秒与标准体重适应儿童方案中的毫安秒进行了比较。三位放射科医生通过共识将图像质量评为“非常好”、“好”、“可诊断”和“差”。与24例未进行管电流调制的MSCT检查相比，在感兴趣区测量标准差来评估噪声。剂量降低了26%至43%（平均36%），具体取决于患者的体型和体重。总体而言，未观察到图像质量下降。测量的噪声显示最多降低26%，最多增加36%，尽管图像质量没有下降。在线管电流调制现已成为我们机构MSCT的标准操作。在儿童MSCT检查的常规检查中，通过在线管电流调制可以大幅降低剂量而不损失图像质量。
