1
production of sectional body images by administration of a natural substance, such as glucose, labeled with a positron-emitting isotope; the rays subsequently emitted are interpreted by computer to show the internal distribution of the substance administered; PET has been used to follow blood flow through an organ and to measure metabolic activity within an organ, such as the brain, under different conditions
2
production of images through the use of a magnetic field and radio waves; the characteristics of soft tissue are revealed by differences in molecular properties; eliminates the need for x-rays and contrast media
3
use of a computer to generate an image from a large number of x-rays passed at different angles through the body; a three-dimensional picture of a cross-section of the body is obtained; reveals more about soft tissues than does simple radiography
4
use of x-rays passed through the body to make a visual record of internal structures on specially sensitized film
5
generation of a visual image from the echoes of high-frequency sound waves traveling back from different tissues; also called sonography and echography
