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Introduction
Imaging systems employ pulsed ultrasound or the pulsed Doppler mode. The instrumentation system consists of:
- An electrical signal source to vibrate the crystal
- Piezoelectric crystal (transmits ultrasound)
- A second crystal or the same crystal to receive echoes
- Amplifier
- Display
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Read More Introduction
The application of ultrasonic in medical field is based on sonar principle as used by bats, anglers with fish detectors, and ships at sea. This is a totally non-invasive procedure. Acoustic waves are easily transmitted in water and are … Read More
PET scan is an imaging technique which produces images of the body by detecting radiation or gamma rays emitted from the body after the patient is injected with radioactive substance. When a positron emitted by a radioactive substance bombards an … Read More
Background of X-ray Imaging
X-rays were discovered accidentally by the Germany Physicist William Roentgen in 1895, while experimenting with electron beams in a gas discharge tube. He discovered that a screen in the laboratory started glowing when the electron tube … Read More
Diagnostic techniques are investigations and tests performed on patients with the intention to identify the cause of illness. The ultrasound is sonic energy at frequencies above the audible range. The most widely used applications of ultrasound in diagnostic medicine involve … Read More