Considered a Safe modality
Goal= max benefit with minimal risk
ALARA- as low as reasonably achievable
No evidence of biological effects on patients
Experiments performed to help determine
long term effects on humans
Physics laws & Properties
The transducer probe is the main part of the
ultrasound machine. The probe is what makes
the sound waves and receives the echoes.
It generates and receives the sounds waves
using the principle called
Consider just four of the energy levels in a certain atom, as shown in the diagram.
How many spectral lines will result from all possible transitions among these levels?
Which transition corresponds to the highest-frequency light emitted?