From the Medical Imaging Centre (Y.Z., Z.L., J.M., Z.P., X.Q., M.X., H.Z.) and Department of Pediatrics (Y.H.), Ankang Central Hospital, Ankang 725000, China; and CT Laboratory, GE Healthcare China, Beijing, China (J.L.).
Radiology. 2018 Jan;286(1):279-285. doi: 10.1148/radiol.2017170019. Epub 2017 Sep 25.
Purpose To compare image quality, patient preparation time, and radiation dose using a single axial rotation with 16-cm wide-detector computed tomography (CT) in imaging the infant chest without sedation with those in infants examined by using a 64-row CT and sedation. Materials and Methods Thirty-two infants (group 1) were prospectively enrolled to undergo nonenhanced chest CT without sedation using a single axial rotation on a 16-cm wide-detector CT scanner. Patients were imaged with automatic tube current modulation and tube voltages of 80 kVp for patients weighing 5 kg or less and 100 kVp for patients weighing more than 5 kg. Patient preparation time, CT dose index (CTDI), dose-length product (DLP), and image quality were compared with those in a historical control group consisting of 30 infants (group 2) who underwent conventional helical scanning with sedation performed by using a 64-row volume CT scanner. The Student t test for independent samples was used to assess continuous variables. The Mann-Whitney rank test and the κ test were used to evaluate image quality. Results There was no statistically significant difference in body weight, age, mean CT attenuation value, image noise, and subjective image quality score between the two groups. However, compared with the group scanned by using a 64-row volume CT scanner (group 2), group 1 experienced significantly reduced scan time by 83% (0.35 second vs 2.01 seconds ± 0.21 [standard deviation]), preparation time by 57% (41.25 minutes ± 103.78 vs 96.5 minutes ± 151.77), CTDI by 42% (2.03 mGy ± 0.4 vs 3.52 mGy ± 0.03), and DLP by 52% (27.07 mGy·cm ± 6.97 vs 55.84 mGy·cm ± 6.46) (P < .05 for all). Conclusion Compared with conventional 64-row helical CT with sedation, use of a single axial rotation with 16-cm wide-detector CT in imaging the infant chest without sedation can reduce radiation dose, preparation time, and total scan time, while providing comparable image quality. RSNA, 2017.
目的 比较单次轴位旋转 16cm 宽探测器 CT 与使用镇静的 64 层 CT 对婴儿胸部进行非增强扫描的图像质量、患者准备时间和辐射剂量。
材料与方法 32 例婴儿（组 1）前瞻性纳入研究，在不使用镇静剂的情况下，使用单次轴位旋转 16cm 宽探测器 CT 扫描仪进行非增强胸部 CT 检查。对于体重 5kg 或以下的患者，使用自动管电流调制和 80kVp 的管电压，对于体重超过 5kg 的患者，使用 100kVp 的管电压。比较两组患者的准备时间、CT 剂量指数（CTDI）、剂量长度乘积（DLP）和图像质量。使用独立样本 t 检验评估连续变量。使用 Mann-Whitney 秩检验和 κ 检验评估图像质量。
结果 两组间体重、年龄、平均 CT 衰减值、图像噪声和主观图像质量评分差异均无统计学意义。与使用 64 层容积 CT 扫描仪扫描的组 2 相比，组 1 的扫描时间显著缩短 83%（0.35 秒比 2.01 秒±0.21[标准差]），准备时间显著缩短 57%（41.25 分钟比 96.5 分钟±151.77），CTDI 显著降低 42%（2.03mGy±0.4 比 3.52mGy±0.03），DLP 显著降低 52%（27.07mGy·cm±6.97 比 55.84mGy·cm±6.46）（均 P<0.05）。
结论 与使用镇静剂的常规 64 层螺旋 CT 相比，在不使用镇静剂的情况下，单次轴位旋转 16cm 宽探测器 CT 成像可以降低婴儿胸部的辐射剂量、准备时间和总扫描时间，同时提供可比较的图像质量。RSNA，2017 年。
