Detection,calibration,and clinical impact of micro-offsets in CT laser positioning system
10.3969/j.issn.1671-332X.2025.11.029
- VernacularTitle:CT激光定位系统微小偏移的检测、校准及临床影响研究
- Author:
Yunping LIU
1
;
Qu CHEN
1
Author Information
1. 达州市中西医结合医院 四川达州 635000
- Publication Type:Journal Article
- Keywords:
CT equipment;
Laser positioning system;
Minor deviation;
Testing methods;
Calibration strategy;
Radiation dosage;
Scanning accuracy
- From:
Modern Hospital
2025;25(11):1761-1764
- CountryChina
- Language:Chinese
-
Abstract:
In CT examination,micro-offsets of±1-2 mm in CT laser-positioning systems may compromise clinical diag-nostic accuracy even when they remain below the equipment failure threshold.This paper analyzes the technical differences of CT laser positioning systems from different manufacturers and constructs a multidimensional micro-offsets detection system that com-bines phantom detection measurements,image backtracking analysis algorithm,and real-time monitoring technology.Integrating the clinical experience of multiple medical institutions,we proposed a brand-and anatomy-specific calibration strategy and explore the impact of micro-offsets on scanning accuracy and radiation dose.The strategy was verified in two clinical cases:in neurosur-gery,a Siemens CT positioning offset caused tumor residue,and after intervention the target deviation rate dropped to 0;in ortho-pedics,a GE CT offset forced a surgical plan revision,and post-intervention the plan-matching rate reached 100％.These results provide both a systematic theoretical foundation and standardized operating procedures for clinical practice.
