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DMI PHYSICS QUIZ 1 2025 QUESTIONS AND ANSWERS In ultrasound, the following events happen: - ....ANSWER ...-1. The ultrasound machine transmits high-frequency (1 to 20 megahertz) sound pulses into the body using a probe. 2. The sound waves travel into the body and hit a boundary between tissues (e.g. between fluid and soft tissue, soft tissue and bone). 3. Some of the sound waves reflect back to the probe, while some travel on further until they reach another boundary and then reflect back to the probe . 4. The reflected waves are detected by the probe and relayed to the machine 5. The machine calculates the distance from the probe to the tissue or organ (boundaries) using the speed of sound in soft tissue (1540 m/s) and the time of the each echo's return (usually on the order of millionths of a second). 6. The machine displays the distances and intensities of the echoes on the screen, forming a two dimensional image. ....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1