High resolution computed tomography of the lungs

dimensional computer reconstruction of images obtained with x rays and other modalities, and the use of computer systems to enhance, store, and display images.Techniques such as ultrasonography and magnetic resonance imaging that do not use ionising radiation will continue to replace some x ray procedures.New imaging techniques may include infrared imaging and microwave tomography.In radio- therapy, technological improvements will enable the radiation beam to be confined more precisely to the tumour.The benefits of R6ntgen's discovery have been enormous, but there has been a down side.Initially, the dangers associated with the use of x rays were not known, and some of the pioneers received doses of radiation that proved fatal.Tremendous advances in protection against radiation and in reducing doses have taken place over the years and have considerably reduced the dangers from ionising radiation.Although the risks are slight, there should always be a valid clinical indication for any request for an x ray examination.