Method for detecting the mechanical precision of cone-beam computed tomography device based on accelerator and its implementation(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第2期
- Page:
- 168-173
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Method for detecting the mechanical precision of cone-beam computed tomography device based on accelerator and its implementation
- Author(s):
- ZHENG Lifu1; ZHANG Yuqi2; FANG Chuan2; GE Yun2; CHEN Ying2; HUANG Xiaolin2
- 1. Beijing Institute of Medical Device Testing, Beijing 101111, China; 2. School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Keywords:
- Keywords: cone-beam computed tomography; infrared binocular camera; positioning ball; mechanical isocenter; imaging isocenter
- PACS:
- R318
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.02.007
- Abstract:
- Abstract: Objective To design and implement a mechanical precision detection method for measuring and analyzing the mechanical parameters of cone-beam computed tomography (CBCT) device, with the repeatability within 0.5 mm, measurement error within 0.5 mm and time consumption of a few minutes. Methods The system hardware included infrared binocular camera, positioning ball, registration pen and horizontal registered instrument. The infrared binocular camera output the central spatial coordinates of the positioning ball. According to the coordinates, the mechanical isocenter coordinate of accelerator was calculated. Moreover, the deviation between the mechanical isocenter of accelerator and the imaging isocenter of CBCT device was calculated based on the CBCT image of positioning point; and then registration pen was used to calculate CBCT flat angle errors. Results The proposed method was used to conduct 3 experiments on a CBCT device in a hospital to obtain the mechanical isocenter coordinate of accelerator, CBCT imaging isocenter coordinate, distance deviation between two isocenters, and CBCT flat angle errors, etc. Conclusion This proposed method for detecting the mechanical precision of CBCT device has the advantages of simple operation, accurate results and high repeatability, digitizing, automating and simplifying complicated quality control processes, which bring great convenience to daily quality inspection of CBCT device and provide guidance for relevant technical personnel and medical staff in the safe application of CBCT in clinic.
Last Update: 2020-03-03