Automatic analysis method of CT reconstruction layer thickness and localization optical accuracy
10.19745/j.1003-8868.2024235
- VernacularTitle:CT重建层厚和定位光精度自动分析方法研究
- Author:
Xiao-san XU
1
;
Xiang DU
1
;
Chun-yong YANG
1
;
Jin WANG
1
Author Information
1. 江苏省疾病预防控制中心(江苏省预防医学科学院),南京 210009
- Publication Type:Journal Article
- Keywords:
CT reconstruction layer thickness;
localization optical accuracy;
oblique line method;
cross diagonal method
- From:
Chinese Medical Equipment Journal
2024;45(12):50-54
- CountryChina
- Language:Chinese
-
Abstract:
Objective To propose an automatic analysis method for CT reconstruction layer thickness and localization optical accuracy.Methods The reconstructed images by scanning the CTP401 module of Catphan500 detection phantom with an X-ray computed tomography device were selected as the research objects.The oblique line method and cross diagonal method were used for the automatic analyses of CT reconstruction layer thickness and localization optical accuracy by using MATLAB software and OTSU algorithm,so as to obtain the detection results for CT reconstruction layer thickness and localization optical accuracy.The two methods were compared in terms of the accuracy of the detection results.Results By the oblique line method,the CT reconstruction layer thicknesses calculated with the lengths of the wires at 3,6,9 and 12 o'clock positions were 10.69,10.69,10.49 and 10.69 mm respectively,and the localization optical accracies calcultaed with the the distance from the center of the wire image to the center of the module at 3,6,9 and 12 o'clock positions were-0.092,0.079,0.060 and-0.014 mm respectively;by the cross diagonal method,the CT reconstruction layer thicknesses calculated with the lengths of the wires at 3 and 9 o'clock positions and at 6 and 12 o'clock positions were 10.70 mm and 10.80 mm respectively,and the localization optical accracies calcultaed with the the distance from the center of the wire image to the center of the module at 3,6,9 and 12 o'clock positions were-0.092,0.080,0.061 and-0.014 mm respectively.The CT reconstruction layer thicknesses by the oblique line method were closer to the true values than those by the cross diagonal method,and the localization optical accuracies by the two methods were basically the same at the corresponding positions.Conclusion The automatic analysis methods proposed can detect CT reconstruction layer thickness and localization optical accuracy objectively and accurately.[Chinese Medical Equipment Journal,2024,45(12):50-54]
