- The Physics of Ultrasound: background
{"Image DocumentName": "- The Physics of Ultrasound: background", "Image ImageDescription": "Seeing With Sound. - The Physics of Ultrasound: background. Most imaging technologies are concerned with the interaction of ionizing radiation (x-rays, g-rays, or particles) or electromagnetic interactions with tissues in the body. Ultrasound is different \u2013 it is not an electromagnetic wave and it is non-ionizing. Sound is a mechanical wave \u2013 it needs a medium in order to propagate. Ultrasound is high-frequency sound waves in the 1 \u2013 10MHz range. Ultrasound waves are traveling waves and not standing waves. The energy associated with the waves can be absorbed by the material and the ultrasound waves can be reflected or refracted at different tissue boundaries. Ultrasound image formation is accomplished by using echoes, or reflections from different media, such as organs, vessels or other structures. Refraction produces distorted images and absorption is of little clinical value.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}