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Ultrasound is a safe imaging method as it uses sound waves which are non-ionising form of radiation. The sound waves used are of much higher frequency than the range that human ears are sensitive to.
Variations of ultrasound like Doppler-shifted Ultrasound provide measurement of flow rates (movement) and Harmonic Ultrasound can discriminate between different tissue type effectively.
In the following I reproduce the slides of my talk at James Watt Auditorium, East Kilbride, Scotland in the year 2008:
Change in frequency of sound waves (hence the shift in pitch) is proportional to the speed of the object divided by the speed of sound.
Some references: This list should be updated ...
X-Ray imaging provides a means of looking inside the body but is only able to provide data on total radiation absorbed by the tissue that lies in the path of the X-ray beam.
CT is a much more versatile technique that provides a three dimensional view of the inside of the body and from the data it is possible to view sections of the body from different angles. However, this is achieved at the cost of much higher radiation dose to the patient.
Philips and Toshiba make some state of art CT scanners and I have demonstrated the strength of CT by showing some examples obtained from these devices.
