How does the inspection process for buttons on a CT imaging machine cover the core functional modules?
Release Time : 2026-02-03
The self-test process for CT imaging machine buttons revolves around core functional modules, ensuring the reliability of key components through systematic steps. The self-test process typically begins with power supply and hardware initialization. After pressing the CT imaging machine buttons, the equipment first checks the status of the main power supply, control cabinet power supply, and computer system to confirm power supply stability and hardware connectivity. This stage must cover the power supply links of core components such as the X-ray tube, detector, and scanning gantry to prevent subsequent testing failures due to power fluctuations or poor contact. For example, an abnormal power supply to the X-ray tube may cause a high-voltage generator malfunction, directly affecting X-ray generation; therefore, power supply testing is a fundamental step in the self-test process.
Subsequently, the self-test process moves to the core component functionality verification stage, focusing on testing the collaborative working capability of the X-ray tube, detector, and scanning gantry. As the X-ray source, the X-ray tube's cathode filament heating, anode target rotation, and the stability of the high-voltage generator all need to pass the self-test verification. If the X-ray tube cannot emit an electron beam normally or there is a leak in the high-voltage circuit, it will lead to insufficient X-ray dose or increased image noise. The detector converts X-rays passing through the body into electrical signals. During self-testing, its sensitivity, linearity, and dead pixels are checked to ensure accurate data acquisition. The rotation and translation accuracy of the scanning gantry are equally critical; self-testing verifies the synchronization of its mechanical transmission system to prevent motion artifacts during scanning.
Self-testing of the data acquisition and transmission stages is a core step in ensuring image quality. The raw signals acquired by the detector must be transmitted to the computer system via preamplifiers, analog-to-digital converters, and other modules. Signal loss or distortion at any stage will lead to image reconstruction failure. The self-test process simulates the data acquisition process, checks the integrity of the signal link, and verifies the accuracy of data transmission through checksums or cyclic redundancy check (CRC). Furthermore, the positioning accuracy of the scanning bed is also checked at this stage to ensure that patient positioning errors are within acceptable limits, preventing bed movement deviations from affecting the accuracy of the scanning range.
Self-testing of the image reconstruction algorithm must cover the entire process from raw data to the final image. After receiving the detector data, the computer system generates tomographic images using algorithms such as filtered backprojection or iterative reconstruction. The self-test process uses preset phantom data (such as the Catphan phantom) to verify the accuracy of the reconstruction algorithm, checking whether the image resolution, contrast, and CT value linearity meet standards. For example, defects in the reconstruction algorithm may lead to artifacts or abnormal tissue density in the images, affecting diagnostic results.
The self-test of the radiation dose control module is a crucial step in ensuring patient safety. CT imaging must strictly adhere to the ALARA principle (reasonably low as feasible). The self-test process checks whether the equipment automatically adjusts the tube voltage, tube current, and scan time according to the patient's body size and the scanned area to ensure the radiation dose is within safe limits. Furthermore, radiation leakage detection is also performed at this stage to confirm that the radiation shielding of the scanning chamber and control console meets national standards.
The self-test of the user interface and operation control console ensures the reliability of human-machine interaction. The self-test process verifies the responsiveness and accuracy of the touchscreen, physical CT imaging machine buttons, and control software, avoiding operational delays or accidental triggering. For example, poor contact in the scan start CT imaging machine buttons may prevent the equipment from starting normally or unexpectedly interrupt the scan; therefore, interface self-testing is key to ensuring smooth operation.
Finally, the self-test process generates a detailed self-test report, recording the test results and potential problems of each module. If a fault is detected, the equipment will notify the operator through audible and visual alarms or interface prompts, and lock certain functions until the fault is resolved. For example, if the number of defective pixels on the detector exceeds a threshold, the equipment will prevent scanning from starting and prompt for replacement of the detector module. Through this closed-loop self-test mechanism, the CT imaging machine can ensure that the core functional modules are in optimal working condition before each scan, providing reliable technical support for clinical diagnosis.