DR (digital X-ray) detection equipment has become an indispensable diagnostic tool in modern hospitals due to its advantages of clear image quality, relatively low technical requirements, and reasonable price. When purchasing medical DR equipment, hospitals should pay special attention to its focal size, as focal size has a crucial impact on imaging performance.
The focal point of DR equipment actually refers to the nominal focal size of the X-ray tube, which is the position where electrons collide with the anode target surface and where X-rays are generated. The size of the focal point determines the contact area of the electron hitting the target surface, which in turn affects the clarity of the digital image.
Specifically, the larger the focus, the blurred the edges of the image, and the more pronounced the penumbra phenomenon, resulting in an overall unclear image. This is because the X-ray beam generated by the large focal point is more divergent, causing the edges of the image to be irradiated by X-rays from multiple directions, resulting in a blurring effect. On the contrary, the smaller the focus, the sharper the edges of the image, and the overall image is clearer. The X-ray beam generated by the small focal point is more concentrated, which can more accurately reflect the shape and structure of the subject.
However, it should be noted that although small focal points can bring higher image clarity, their exposure dose is limited and may not be reliable enough when capturing thicker areas. In addition, the energy concentrated on the small focal point is relatively high, which can easily generate high heat and cause the focal surface to melt. Therefore, in practical applications, it is necessary to choose the appropriate focus size based on the shooting location and the specific situation of the patient.
To address this issue, many DR devices currently on the market adopt dual focus technology. This technique uses two sets of filaments of different sizes to produce larger and smaller effective focal points, respectively. Doctors can choose the appropriate focal point size according to their shooting needs, which ensures the clarity of the image and avoids image quality problems caused by focal points that are too large or too small.
For example, the Huarui Imaging Digital Medical X-ray Photography System is equipped with dual focus technology for tube and flat panel detectors. The large heat capacity tube and high-power generator of this system can ensure stable performance even under long-term high load operation. At the same time, both the tablet and the tube can achieve dual rotation, which facilitates the shooting of various complex parts and greatly improves the flexibility and convenience of clinical positioning.
In summary, the size and focus of DR devices have a significant impact on imaging performance. Hospitals should fully consider the focal size and technical characteristics when purchasing DR equipment, and choose equipment that is suitable for their own needs to ensure the accuracy and reliability of diagnosis.
Post time: Nov-30-2024