Principles and Instruments CH.1 Key Terms Flashcards
Sonography
The use of ultrasound in diagnostic medicine.
Ultrasound
Acoustic energy with a frequency above 20,000 Hz or 20 kHz.
Ultrasound range in medical sonography
2 - 18 MHz
Doppler effect
Original frequencies produced by the transducer are different from returning frequencies produced by moving tissue and blood flow.
Transducer
A device that generates ultrasound.
Image (from the Latin term for imitate)
A reproduction, representation, or imitation of the physical aspects of an object.
Pulse-echo technique
Pulses of ultrasound generated by the transducer interact with tissue and return to the transducer to be shown on the monitor.
Gray-scale image (same meaning as B-Brightness)
The image produced based on the correspondence between brightness and echo strength.
Operating Principle 1
Using the direction of the pulse and the time it takes for each echo to return to the transducer to determine positional information.
Operating Principle 2
A newer approach to locating a structure by sending several pulses of ultrasound through the cross-section anatomy and using computational processes to determine the location and strength of each echo.
Linear image
A result of cross-sectional images, or vertical parallel scan lines that result in a rectangle shape.
Sector image
A result of each pulse traveling to different directions forming a pizza shape.
Volume imaging
3D scanning and imagine
Color-Doppler displays
Color coded presentations of Doppler information in forms called color-Doppler shift and power.
Spectral-Doppler displays
Quantitative analysis presentations of Doppler information using anatomic imaging to determine the location.
