Preparation stage
Before operating the X-ray machine handbrake, the first thing to ensure is that the equipment has been turned on correctly and all parameters (such as tube voltage, tube current, exposure time, etc.) have been set according to the inspection requirements. This is like checking the various indicator lights on the dashboard before driving a car, and adjusting the seats, rearview mirrors, etc. For example, in medical X-ray examinations, appropriate exposure parameters are determined based on the patient’s body parts (such as chest, abdomen, or limbs) and the purpose of the examination (whether it is preliminary screening or detailed diagnosis).
Both the inspector and the examinee (if it is a medical application) should wear protective equipment. The operator should wear lead gloves, lead aprons, etc., and the examinee should wear corresponding protective equipment according to the inspected area to reduce unnecessary radiation exposure.
Types and operating methods of handbrakes
Single level handbrake: This handbrake has only one button, and when the button is pressed, the X-ray machine will expose according to the preset exposure time. When operating, press the button steadily with your fingers until the exposure is complete. For example, when some portable X-ray machines are used for field first aid or simple limb examinations, single lever handbrake operation is simple and convenient. When pressing the button, be careful to avoid shaking, as shaking may affect the stability of exposure, leading to a decrease in image quality.
Dual speed handbrake: The dual speed handbrake has two buttons, usually divided into reserve mode and exposure mode. Firstly, lightly press the first gear (preparatory gear). At this point, the high-voltage generator of the X-ray machine begins to preheat, and the related circuits and equipment begin to prepare for operation. This process is usually indicated by indicator lights. After the preparation indicator light is on, press the second mode (exposure mode) firmly again, and the X-ray machine will start the real exposure. For example, in large X-ray equipment in hospitals, the design of dual speed handbrakes is aimed at better controlling the exposure process, ensuring that the equipment performs exposure at its optimal state, and improving image quality.
Precautions during exposure process
When pressing the handbrake for exposure, the operator should maintain concentration and observe the working status of the equipment. During the exposure period, do not casually release the handbrake (for single gear handbrake) or move the device, as this may cause exposure interruption or produce artifacts. Just as camera shake can blur photos during photography, unexpected situations during X-ray exposure can also affect image quality.
At the same time, pay attention to the sound of the equipment. Under normal circumstances, the X-ray machine will make a slight buzzing sound during exposure. If you hear abnormal sounds (such as sharp noises or obvious changes in current sound), it may indicate that there is a problem with the equipment, and it should be checked in a timely manner after the exposure is completed.
Post time: Dec-07-2024