First, the volume of the x ray collimatorNK103 is small compared to the x ray collimator NK202, the outer dimension (WLH) of the x ray collimator NK103 is 158 mm x 138 mm x 83 mm, and the outer dimension (WLH) of the NK 202 is 185 mm x 198 mm x 145 mm. The weight of NK103 is 2.6 kg in terms of weight, and the weight of NK202 is 6.8 kg. In appearance, the instrument panel knob of the NK103 is on the same side, and the instrument panel knob of the NK202 is on the same side. The x ray collimator NK103 is suitable for 125KV bulbs, while the NK202 is suitable for 150KV bulbs. The maximum illumination field of x ray collimator NK103 is 430mmx430mm (SID=90cm), and the maximum illumination field of NK202 is 440mmx440mm (SID=100cm). NK103’s light field average brightness >100lux, NK202’s light field average brightness >160lux. The NK103 has a ratio of >3:1 and the NK202 has a ratio of >4:1. NK103 bulb 12V/50W, NK202 bulb is 24V/150W.