Study on Effects of CT Image Quality Which Contain Tracheal Stent Under Different Scanning
Conditions in Radiotherapy Simulation Positioning
LIN Tao1,2,3, NI Xinye2,3, GAO Liugang2,3, SUI Jianfeng2,3, XIE Kai2,3, CHANG Shuquan1
1. Nanjing University of Aeronautics and Astronautics, Nanjing Jiangsu 210000, China; 2. Department of Radiation Oncology,
Changzhou Second People’s Hospital Affiliated to Nanjing Medical University, Changzhou Jiangsu 213003, China; 3. Center of
Medical Physics, Nanjing Medical University, Changzhou Jiangsu 213003, China
Abstract：Objective To evaluate the tumor localization CT scan conditions suitable for patients with tracheal stent, by comparing the
CT images of tracheal stents under different scanning conditions. Methods The tracheal stent was placed in a self-made foamed tube,
with which the stent was then placed in a non-homogeneous phantom for CT positioning scanning. The scanning conditions were
80 kV/120 mAs, 120 kV/80 mAs, 120 kV/120 mAs, and the scanning methods were axial scanning and helical scanning. The slice
thickness of scanning were 0.6, 1, 2 and 3 mm. After the scanning, the images were sent to the treatment planning system. Two
experienced radiologists rated the images for each group. CT values of the tracheal stent at the same level in each group of images
were read using Matlab 8.3 data processing software. Results Under the same condition, the axial scan is clearer than the spiral scan.
The smaller the scanning slice thickness, the less the artifacts and the clearer the image. The tube current had no effect on the CT value of
the stent. The smaller the tube voltage, the larger the CT value of the stent. Conclusion In the radiotherapy CT localization of tumor
patients with tracheal stent, spiral scan should be selected as the scanning mode, the slice thickness of scanning should be 1 mm, and
the fixed tube voltage should be selected.
林涛1,2,3，倪昕晔2,3，高留刚2,3，眭建锋2,3，谢凯2,3，常树全1. 不同放疗定位CT扫描条件对气管支架图像质量影响的研究[J]. 中国医疗设备, 2019, 34(8): 85-88.
LIN Tao1,2,3, NI Xinye2,3, GAO Liugang2,3, SUI Jianfeng2,3, XIE Kai2,3, CHANG Shuquan1. Study on Effects of CT Image Quality Which Contain Tracheal Stent Under Different Scanning
Conditions in Radiotherapy Simulation Positioning. China Medical Devices, 2019, 34(8): 85-88.
