In today’s rapidly changing medical imaging technology. The accuracy and efficiency of CT scans directly affect the early diagnosis and treatment decisions of diseases. Behind the “perspective eye” of medical CT, there is an invisible pair of “laser hands” that are reshaping the accuracy of diagnosis, which is the laser interferometer. When an error of 0.1 mm may affect the positioning of the tumor, and when micron-level vibration may cause image pickup blurring, this ability derived from serving industrial machine tools is gradually giving the medical industry “superpower” with micron-level measurement accuracy.
1. Measurement needs
The positioning accuracy, repeatability and straightness of the CT slide of the inspection bed, the rotation accuracy and rotation positioning accuracy of the rotating frame.
2. Industry pain points
The traditional method is to manually use the dial indicator or dial indicator to measure the straightness and repeated positioning accuracy of the running axis, and rely on the square ruler or marble as the benchmark for calibration. The most important thing is that it is impossible to measure the positioning accuracy and rotation accuracy of the equipment.
3. CLC instrument scheme
SJ6000 laser interferometer is equipped with linear lens group + angle lens group + straightness lens group + WR50 automatic precision rotary table.
3.1. Measurement advantages
- The length measurement accuracy is 0.5ppm, the resolution is 1nm, and the maximum length measurement distance is 80m. Support 360° arbitrary angle measurement, rotation accuracy ± 1″;
- Equipped with a temperature compensation module, it can collect the temperature and humidity of the on-site environment in real time to compensate for the laser wavelength and measured materials, so that the measurement results are more accurate.
- The test results can generate data charts and reports, and automatically analyze and generate compensation data to compensate the system and improve the operation accuracy.
3.2. Test Steps
★ Installation and commissioning
Adjust the tripod to the appropriate height, place the laser interferometer on the tripod, and adjust it to the same height as the CT slide. The linear mirror is placed on the slide rail and moves with the measurement axis, and the optical path is completed by adjusting the main unit and the linear mirror group to ensure that the optical path is parallel to the detection axis.
★ Data collection
The measurement stroke is 0-650mm, the interval is 25mm, the round trip is 1mm, the laser interferometer pause time is 2S, and the equipment operation is suspended 3S (note that the equipment pause time is greater than the laser interferometer setting time of 1S). The device and laser interferometer are set up in the same way to start running the measurement.
★ Data compensation
After the measurement, the software automatically generates compensation data through algorithms.
Before compensation: positioning accuracy 81.173um, repeated positioning accuracy 2.683um. There is a significant difference between the detected “actual location data” and “theoretical location data”, which does not meet the factory standards.
After compensation: the positioning accuracy is 7.037um, the repeated positioning accuracy is 1.328um, and the diagnostic accuracy of the CT scanner is greatly improved after the compensation accuracy.
The improvement of the accuracy of medical equipment not only strengthens the accuracy of treatment, but also guarantees life and health. From scientific research laboratories to operating tables, laser interferometers are redefining the precision boundaries of medical CT at the speed of “light”, which is not only a “calibration artifact” in the hands of engineers, but also a “diagnostic weapon” in the eyes of doctors. In this collision between light and medicine, we are witnessing technological innovation, and the deeper goal is the eternal commitment of humanity to the pursuit of health. Image Image Image
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