The significance of the size focus of the DR device: the smaller the focus the clearer the image


DR detection equipment has the advantages of clear image quality, small technical requirements, relatively reasonable price, etc., and has almost become one of the standard equipment in modern hospitals.

When purchasing medical DR, hospitals should pay attention to the focal point size of the DR detection equipment, because the size focal point of the DR equipment is of great significance to the imaging effect.

The X-ray tube, commonly known as the bulb tube, is one of the core constituent parts of the DR and is the component that generates X-rays. The focal point of the DR equipment we refer to in this article is the nominal focal size of the X-ray tube.

Focus is the location of the electron impact target surface, but also the location of X-ray generation, the size of the focal point that the electron impact anode target surface contact surface size. Focal point size affects the clarity of the digital image, the larger the focal point, the more fuzzy the edge of the image, that is, the penumbra is more pronounced, the less clear the image, on the contrary, the smaller the focal point, the image edge is about sharp, the clearer the image.

Although the DR equipment small focal point is more clear than the large focal point, but because the small focal point exposure dose is limited, in the shooting of the thicker position, the large focal point is more reliable. In addition the smaller the focal point, the higher the energy gathered in the focal point, the higher the heat generated, which can easily lead to melting of the focal surface. Whereas a large focal spot can withstand a large beam current, a large beam current produces X-rays of sufficient brightness to shorten the time it takes to take a picture or image.

Based on the size of the focal point of this feature, many DR equipment on the market at present more than the use of dual-focal point technology, that is, the use of two groups of different sizes of filaments, larger filaments to produce a larger effective focus, smaller filaments to produce a smaller effective focus. For example, PUMA’s PLX8500 digital medical radiography system is equipped with a large thermal capacity bulb and a high power generator, and its flat plate and bulb can realize dual rotation. The rotation of the bulb tube can be convenient for cervical spine orthotopic and patellar axial photography, and for patients who are not convenient to move, such as those who are riding a wheelchair, the rotatable flat plate detector can also make it convenient to take pictures of upper and lower extremities even when the patient is in a wheelchair. Detector rotation: ≥90°, bulb rotation: ≥180°, clinical positioning is more convenient, to solve various clinical positioning needs.


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