正畸学中螺旋CT低剂量扫描方案：与传统X线技术相比的体表入射剂量评估
Low-dose protocol of the spiral CT in orthodontics: comparative evaluation of entrance skin dose with traditional X-ray techniques.
作者信息
Cordasco Giancarlo, Portelli Marco, Militi Angela, Nucera Riccardo, Lo Giudice Antonino, Gatto Elda, Lucchese Alessandra
机构信息
Department of Orthodontics, University of Messina, Via Consolare Valeria, Messina 98100, Italy.
出版信息
Prog Orthod. 2013 Sep 10;14:24. doi: 10.1186/2196-1042-14-24.
BACKGROUND
The aim of this study was to evaluate the amount of radiation doses absorbed by soft tissues (entrance skin dose) with a low-dose spiral computed tomography (CT) protocol compared to conventional X-ray techniques commonly used in orthodontics.
METHODS
The amount of skin dose has been evaluated using a tissue-equivalent head-neck radiotherapy humanoid phantom with thermoluminescent dosimeters placed at the level of eye lens, parotid glands, and thyroid glands. CT images have been taken using a Sensation 16 Siemens CT scan and a low-dose protocol (15 mAs, 1 pitch, 2.5 mGy (CTDIvol), 80 kV, 1-mm slice thickness).
RESULTS
The difference in image quality between traditional X-ray techniques and low-dose spiral CT was statistically significant (P<0.05). The difference in mean absorbed dose instead was not statistically significant.
CONCLUSIONS
Our protocol allows a more accurate orthodontic diagnosis without an increase of radiological risk for the patients in comparison to traditional X-ray techniques.
背景
本研究的目的是评估与正畸学中常用的传统X射线技术相比，低剂量螺旋计算机断层扫描（CT）方案时软组织吸收的辐射剂量（皮肤入口剂量）。
方法
使用组织等效头颈放射治疗人体模型，将热释光剂量计置于晶状体、腮腺和甲状腺水平，评估皮肤剂量。使用西门子Sensation 16 CT扫描仪和低剂量方案（15 mAs、1螺距、2.5 mGy（CTDIvol）、80 kV、1毫米层厚）进行CT图像采集。
结果
传统X射线技术与低剂量螺旋CT之间的图像质量差异具有统计学意义（P<0.05）。相反，平均吸收剂量差异无统计学意义。
结论
与传统X射线技术相比，我们的方案能够在不增加患者放射风险的情况下实现更准确的正畸诊断。
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