Ultrasound Transducers and Principles

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What term is used to describe an area that contains echoes in an ultrasound image?

Hypoechoic
Hyperechoic
Echogenic (correct)
Anechoic

What is the principle behind the ultrasound transducer's ability to generate sound waves and detect echo signals?

Magnetic induction
Thermal expansion
Piezoelectric effect (correct)
Electromagnetic induction

What determines the brightness of the dots on the ultrasound screen?

Distance from the transducer
Type of transducer used
Frequency of the ultrasound waves
Strength of the returning echoes (correct)

What is the purpose of the pulse-echo principle in ultrasound?

To detect and process returning echoes (A) Signup and view all the answers

What is the primary factor that determines the location of the dots in an ultrasound image?

Time travelled (D) Signup and view all the answers

What is the term for an area that contains no echoes in an ultrasound image?

Anechoic (A) Signup and view all the answers

What is the frequency range used in Obstetrics and Gynaecology ultrasound?

2.5-5 MHZ (D) Signup and view all the answers

What is the term for an area that contains only a few echoes in an ultrasound image?

Hypoechoic (A) Signup and view all the answers

What is the name of the display mode used in localization of foreign bodies in the eye?

A-MODE (B) Signup and view all the answers

What is the frequency range used in Echocardiography?

2-8 MHZ (A) Signup and view all the answers

What is the mechanism used to produce the ultrasound image?

Both A and B (C) Signup and view all the answers

What is the component responsible for storing the image as digits and pixels?

Image memory (B) Signup and view all the answers

What is the primary advantage of real-time imaging in ultrasound?

Accurate size and depth measurements (C) Signup and view all the answers

What is a limitation of ultrasound imaging?

All of the above (D) Signup and view all the answers

What is the primary principle of Doppler ultrasound?

Measuring blood flow velocity (A) Signup and view all the answers

What is the purpose of spectral Doppler?

To evaluate blood flow patterns (A) Signup and view all the answers

What is the primary advantage of color Doppler ultrasound?

Visualizing blood vessels (A) Signup and view all the answers

What is the primary method of recording and archiving ultrasound images?

Picture archiving and communication system (PACS) (B) Signup and view all the answers

Echogenic area

An area on an ultrasound image that reflects sound waves and appears bright.

Piezoelectric effect

The ability of certain materials, like quartz crystals, to convert mechanical pressure (sound waves) into electrical signals, and vice versa.

Echo strength and image brightness

The intensity of the returning echoes determines the brightness of the dots representing tissues on the ultrasound screen.

Pulse-echo principle

The principle used in ultrasound where sound waves are emitted, and the time it takes for the echoes to return is used to determine the distance to the reflecting surface.