| 张卫国,蒋涛.智能最佳管电压联合自动管电流在腹部CT扫描中的应用[J].中华放射医学与防护杂志,2017,37(1):68-72 |
| 智能最佳管电压联合自动管电流在腹部CT扫描中的应用 |
| Application of Care kV combined with Care Dose 4D in abdominal CT |
| 投稿时间：2016-06-21 |
| DOI：10.3760/cma.j.issn.0254-5098.2017.01.013 |
| 中文关键词: 体层摄影术,X射线计算机(CT) 智能最佳管电压技术(Care kV) 辐射剂量 |
| 英文关键词:Tomography, X-ray computed Intelligent optimum tube voltage technique(Care kV) Radiation dose |
| 基金项目: |
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| 摘要点击次数: 2895 |
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| 中文摘要: |
| 目的探讨双源CT智能最佳管电压（Care kV）联合自动管电流（Care Dose 4D）技术在腹部CT扫描中的应用。方法选择2016年2月至3月行全腹CT检查的成年患者180例为回顾性研究对象，依据影像质量的参考毫安秒将患者分为3组，采用完全随机化分组的方法，每组60例患者，分别为250 mAs组、200 mAs组和150 mAs组，其余扫描参数和图像重建参数均相同。测量第二肝门层面肝实质的CT值及图像噪声（SD），对比3组患者的信噪比（SNR）、对比噪声比（CNR）、噪声（SD）、平均容积CT剂量指数（CTDIvol）、剂量长度乘积（DLP）和有效剂量（E）。结果 3组患者扫描的平扫期、动脉期及门脉期kV和mAs数值差异均有统计学意义（F=35.25，P<0.05）。随着参考mAs的降低，3组患者选择低kV的频率逐渐增加。3组患者平扫、动脉及门脉期的CTDIvol、DLP、E差异均有统计学意义（F=31.51，P<0.05）。随着参考mAs的下降，辐射剂量逐渐下降，150 mAs组患者的CTDIvol、DLP、E最低。250 mAs组与200 mAs组三期图像的SNR、CNR及噪声差异均无统计学意义（F=1.61，P>0.05）；250 mAs组与150 mAs组，平扫及动脉期图像的SNR及噪声差异均无统计学意义（F=1.98，P>0.05），门脉期图像的SNR及三期图像的CNR差异均有统计学意义（F=27.64，P<0.05）；200 mAs组与150 mAs组平扫及动脉期图像的SNR、CNR及噪声差异均无统计学意义（F=1.95，P>0.05），门脉期图像的SNR、CNR差异均有统计学意义（F=19.63，P<0.05）。结论 Care kV联合Care Dose 4D技术，选择适当的影像质量参考毫安秒值能在有效控制患者辐射剂量的同时，既保证图像质量，还可以有效地减低辐射剂量，操作简单易行。 |
| 英文摘要: |
| Objective To study the application of the intelligent optimum tube voltage (Care kV) combined with automatic tube current (Care Dose 4D) technique in dual source CT scanning for the abdomen.Methods 180 adult patients underwent whole abdominal CT examination from February 2016 to March 2016 of were selected as the retrospective research objects. On the basis of reference mAs of the image quality the patients were divided into three groups using completely randomized grouping method with 60 patients in each group, such as 250 mAs group, 200 mAs group, and 150 mAs group. The other scanning parameters and image reconstruction parameters were the same. The liver parenchyma CT values and image noise(SD) at the second hepatic portal level were measured. The signal-to-noise ratios (SNR) in the three groups were compared as well as contrast to noise ratio (CNR), noise (SD), the average volume CT dose index (CTDIvol), dose length product (DLP) and effective dose(E). Results The kV and mAs values in the plain scan, arterial phase scan and portal phase scan in the three groups of patients had statistically significant differences(F=35.25, P<0.05). With the reducing of the refference mAs, the frequency of choosing lower kV in three groups of patients increased gradually. The CTDIvol, DLP and E of plain scan, arterial and portal phase in three groups of patientshad significant difference (F=31.51, P<0.05). With the decline of the reference mAs, the radiation dose decreased gradually, with 150 mAs group lowest. The SNR, CNR and noise of three phases in 250 mAs group and 200 mAs group had no statistically significant difference (F=1.61, P>0.05). In 250 mAs group and 150 mAs group, the SNR and the noise of plain scan and arterial phase images had no statistically significant difference (F=1.98, P>0.05), and SNR of portal phase images and CNR of three phases had statistically significant difference (F=27.64, P<0.05); In group 200 mAs and group 150 mAs, the SNR, CNR and noise of plain scan and arterial phase images had no statistically significant difference (F=1.95, P>0.05), and the SNR and CNR of portal phase images had significant difference (F=19.63, P<0.05).Conclusions For the combined use of Care kV and Care dose 4D,it is feasible to select appropriate reference mAs in reducing radiation dose without sacrificing imaging quality. |
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