Is there a standard quality inspection specification for led viewing lights?

According to the document number. General technical conditions for medical image photo observation devices (No.55 [2007]) issued by the US Food and Drug Administration (June 5438+1October 3, 20071YY/T06 10-2007), the first implementation standard is "compulsory industry standard grade". Moreover, in the general technical conditions of medical image photo observation devices, 5.4.2, 5.4.3, 5.4.4, 5.4.5 and 5.9 are mandatory provisions. In the document, it is required that "in order to facilitate the production and use units to have an acceptable inspection method for the routine inspection of the medical image photo observation device, so that the domestic similar products can have a more objective evaluation, this standard has unified requirements for the technical parameters and experimental methods of the medical image photo observation device". The contents of this standard include terms and definitions, classification and basic composition, requirements, experimental methods and many other contents. The following are mandatory provisions:

5.4.2 Color temperature of light source: The color temperature of light source passing through the observation screen should not be lower than 6500K, or the color temperature of light source recommended by the film manufacturer should be adopted according to different models of film emulsion.

5.4.3 Brightness: the brightness of the observation screen shall be specified by the manufacturer, but the ordinary analog photo observation device shall be ≥ 2,000 cd/m2, the digital hard copy photo observation device shall be ≥ 3,000 cd/m2, the ordinary molybdenum target photo observation device shall be ≥ 3,500 cd/m2, and the brightness adjustable film observation device shall be > 300-4,000 cd/m2. The movie viewing device with adjustable brightness should be equipped with a brightness indicator, and the corresponding brightness level should be given in the random file.

The International Electrotechnical Commission (IEC) also lists the performance of the medical image observation device and the observation conditions in the diagnosis room as one of the legal quality inspection items for image quality control. At present, the highest central brightness of the image observation device we often use is 1600cd/m2 (including ultra-thin and liquid crystal), and the ISO5580 Euro * * standard stipulates that the central brightness of the observation device used to watch analog images should not be less than 2000cd/m2.

5.4.4 Uniformity: The uniformity of the brightness of the observation screen should be greater than 0.7%.

5.4.5 Stability: The stability of the brightness of the observation screen should not be greater than 2%.

5.9 Signs and accompanying documents

(Excerpted from the important value of establishing the quality standard of modern medical image photo observation device.

Author: Zhang Ning published in the 5th Annual Meeting of Imaging Technology of Chinese Medical Association (report 10).