Abstract: A stereo x-ray system includes two grid-controlled x-ray tubes, a high voltage generator, a grid controller and an x-ray detector. The two grid-controlled x-ray tubes are aligned side by side and their anodes are apart from each other for a short distance. The x-ray output ports of the two x-ray tubes aim at the direction perpendicular to the x-ray detector. The two grid-controlled x-ray tubes are switched on/off in turn and irradiate the subject with alternating x-ray fields; thus, the left and right view x-ray images are alternately formed on the same x-ray detector. The left and right view x-ray images are independently transmitted to the image processing system. After necessary image processing, the stereo image pair is used for stereo displaying.

Abstract: It is often important for medical purposes to obtain nucleated fetal cells during pregnancy. For example, the procedures of amniocentesis or chrionic villae extraction are carried out for this purpose. But these methods are invasive, and carry a small but positive risk to the patient, and are complicated to perform. On the other hand, the purpose of my invention is to obtain nucleated fetal cells (fetal nucleated reticulocytes) from maternal blood, which eliminates the need for invasive methods. There are a small number of nucleated fetal red blood cells (reticulocytes) in maternal blood and my invention is a method and apparatus for separating these fetal cells from maternal blood.