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采用高通道双源系统行鼻窦和颌面颅部低剂量 CT 检查——初步临床结果。

Low-dose computed tomography of the paranasal sinus and facial skull using a high-pitch dual-source system--first clinical results.

机构信息

Department of Diagnostic and Interventional Radiology, Clinic of the Goethe University, Haus 23 C UG, Theodor-Stern-Kai 7, 60590, Frankfurt, Germany.

出版信息

Eur Radiol. 2011 Jan;21(1):107-12. doi: 10.1007/s00330-010-1892-6. Epub 2010 Jul 20.

Abstract

OBJECTIVE

Computed tomography (CT) of the paranasal sinus is the standard diagnostic tool for a wide range of indications in mostly younger patients. This study aims to assess the image quality of CT of the sinus by using a high-pitch dual-source technique with special regard to the radiation dose.

METHODS

Examinations were performed on a second-generation dual-source CT with a pitch factor of 3.0 (dual-source mode). Images were compared with those with a pitch factor of 0.9 on the same system (single-source mode) and with those of 16-slice CT. Image quality was evaluated by four blinded readers using a 5-point scale (1=poor, 5=excellent). Comparison of the dose length product (DLP) was used to estimate radiation exposure.

RESULTS

Seventy-three consecutive patients underwent imaging with the proposed CT protocols. The viewers rated the image quality of the dual-source image sets as nearly as good (3.62) as the single-source images on the same device (4.18) and those on 16-slice CT (3.7). DLP was cut to half of the dose [51 mGycm vs. 97.8 mGycm vs. 116.9 mGycm (p<0.01)].

CONCLUSIONS

Using the proposed dual-source mode when examining the paranasal sinus, diagnostic image quality can be achieved while drastically lowering the patient's radiation exposure.

摘要

目的

鼻窦计算机断层扫描(CT)是一种广泛应用于大多数年轻患者的多种适应证的标准诊断工具。本研究旨在评估高螺距双源技术在鼻窦 CT 中的图像质量,并特别关注辐射剂量。

方法

在第二代双源 CT 机上进行检查,螺距因子为 3.0(双源模式)。将图像与同一系统(单源模式)的螺距因子为 0.9 的图像和 16 层 CT 的图像进行比较。由四位盲法读者使用 5 分制(1=差,5=优)评估图像质量。通过比较剂量长度乘积(DLP)来估计辐射暴露。

结果

73 例连续患者接受了所提议的 CT 方案成像。观察者将双源图像集的图像质量评为几乎与同设备上的单源图像(4.18)和 16 层 CT 图像(3.7)一样好(3.62)。DLP 降低至一半剂量[51 mGycm 比 97.8 mGycm 比 116.9 mGycm(p<0.01)]。

结论

在检查鼻窦时使用建议的双源模式,可以在大幅降低患者辐射暴露的同时获得诊断图像质量。

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