英国将要率先使用新一代的X-线扫描仪(Imatron),该仪器能让医师“看到”处于运动状态的心脏,并及时地作出早期心脏病的可靠诊断。通常,电子计算机断层扫描(CT)所使用的X-线,是由围绕病人做弧形运动的球管所产生,在球管内高速运动的电子束轰击钨靶而产生X-线。穿过病人身体的X-线由在其对侧呈规则排列的探头所接受而转换成图像,因此当球管在病人上方作弧形运动时,放射 The UK will be the first to use a new generation of Imatron, which allows physicians to “see” the moving heart and make timely, reliable diagnoses of early heart disease. In general, X-rays used in computed tomography (CT) are generated by a spherical tube that makes an arc around the patient. A high-speed electron beam in the tube strikes a tungsten target and generates X-rays. The X-rays that pass through the body of the patient are converted into images as received by a probe arrayed regularly on opposite sides of the patient’s body so that when the bulb is arcuately moved over the patient,