| 李航,彭芸,曾津津,张祺丰,尹光恒.联合低电压和自动管电流调节技术降低婴幼儿胸部增强CT扫描剂量[J].中国医学影像技术,2014,30(5):676~679 |
| 联合低电压和自动管电流调节技术降低婴幼儿胸部增强CT扫描剂量 |
| Dose reduction for contrast-enhanced chest CT scanning in infants with low tube voltage and automatic tube current modulation technique |
| 投稿时间：2014-01-27 修订日期：2014-04-15 |
| DOI： |
| 中文关键词: 儿童 体层摄影术，X线计算机 辐射剂量 自动管电流调节 |
| 英文关键词:Child Tomography, X-ray computed Radiation dosage Automatic tube current modulation |
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| 中文摘要: |
| 目的 评价联合应用低电压和自动管电流调节（ATCM）技术在婴幼儿胸部增强CT扫描中降低辐射剂量、提高血管结构对比的价值。方法 对69例3岁以下患儿行64排MSCT增强检查，并分为低电压结合ATCM并噪声指数为9（A组）或10（B组）及标准扫描序列为120kVp结合120mA固定毫安（C组）；测量强化主动脉和外周肌肉CT值及噪声，计算SNR和对比噪声比（CNR）。记录容积CT剂量指数（CTDIvol）。采用5分法评估图像质量；以Kappa方法评价观察者间的一致性。结果 A组和B组主动脉强化明显，分别较C组增高196.04HU（65.51%）和186.57HU（62.34%），A、B组背景噪声平均值较C组分别增加4.15HU和4.36HU；3组间SNR及CNR差异无统计学意义。A组和B组比C组CTDIvol分别降低73.71%和77.00%。结论 在婴幼儿64排MSCT增强扫描中联合应用低电压（80kVp）和ATCM技术可获得临床接受的图像质量和良好的对比，并明显降低辐射剂量。 |
| 英文摘要: |
| Objective To observe the value of combining low tube voltage and automatic tube current modulation (ATCM) technique for reducing radiation dose and improving contrast vascular structures for contrast-enhanced chest CT scanning in infants. Methods All 69 patients aged <3 years were assigned into three groups for contrast-enhanced MSCT scanning, i.e. low kVp and ATCM technique with noise index 9 (group A) or 10 (group B), respectively, and a standard 120 kVp with fixed tube current of 120 mA (group C). Aorta contrast enhancement and surrounding muscle CT values and noises were measured, SNR and contrast-to-noise ratio (CNR) were calculated. The CT dose index of volume (CTDIvol) values were recorded. Imaging quality was assessed by two radiologists using a five-point scale, and the degree of interobserver concordance was evaluated with Kappa statistics. Results Compared with group C, the aorta significantly enhanced in group A and group B, increased by 196.04 HU (65.51%) and 186.57 HU (62.34%), respectively, and the average background noise increased 4.15 HU and 4.36 HU in group A and group B, respectively. SNR and CNR were not statistically different among three groups. Compared with group C, CTDIvol reduced by 73.71% and 77.00% in group A and group B, respectively. Conclusion Combining low tube voltage (80 kVp) with ATCM technique for contrast-enhanced chest CT scanning in infants can obtain good image quality and clinically acceptable contrast degree, and significantly reduce radiation dose. |
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