Introduction to Ultrasound Imaging

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30 Questions

What is the range of frequencies used in diagnostic medical ultrasound?

2 – 15 MHz

What is the velocity of a sound wave through soft tissue?

1540 m/s

What is the frequency of a 7.5 MHz transducer?

7,500,000 Hz

What is the wavelength of a sound wave with a frequency of 3MHz?

0.51 mm

What is the relationship between wavelength, frequency, and velocity of a sound wave?

c = λ × f

What is the unit of measurement for the strength of a sound wave?

Decibels (dB)

What is the principle employed by the transducer to generate sound waves and detect echo signals?

Piezoelectric effect

What is the result of the Returning echoes on the ultrasound screen?

The brightness of the dots is proportional to the strength of the returning echoes

What is the term used to describe an area that contains no echoes on the ultrasound image?

Anechoic

What is the formula used to calculate the wavelength of ultrasound waves?

c = f.λ

What is the term used to describe an area that contains only a few echoes on the ultrasound image?

Hypoechoic

What is the role of the transducer in ultrasound imaging?

Both a transmitter and a receiver of ultrasound waves

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

2.5-5 MHz

What is the purpose of the analogue to digital converter in the ultrasound system?

To convert the analogue signal to digital signal

In which mode of ultrasound display is the echo plotted on the screen as a function of depth?

A-Mode

What is the frequency range used in paediatric brain ultrasound applications?

6-7 MHz

What is the purpose of the image memory in the ultrasound system?

To store the image as digits and pixels

What is the frequency range used in thyroid and scrotum ultrasound applications?

10-14 MHz

What does the display of echoes on a TV monitor show?

Different shades of grey with varying intensity levels

What is emphasized in M-mode display?

The movement of interfaces, including rate, amplitude, and pattern of motion

What is measured using M-mode display?

The movement of the aorta, left atrium, right ventricle, and valves

What is combined with M-mode in Colour M-mode imaging?

Colour Doppler information

What is displayed in conjunction with the corresponding segment of the cardiac cycle in Colour M-mode imaging?

The flow data and M-mode pattern

What modality does Doppler ultrasound combine with to study blood vessels and blood flow?

Various modalities

What is a necessary understanding for a sonographer to have in order to perform and interpret a Doppler examination?

All of the above

What type of Doppler modulation is associated with slow flow velocity?

Power Doppler

What is a limitation of ultrasound imaging?

Unable to penetrate calcific bone and air

What is a potential biological effect of high-intensity pulsed wave ultrasound?

Cavitation and subsequent cell damage

What is an advantage of ultrasound imaging?

It is a non-invasive and cost-effective modality

What is the primary media used for image recording in ultrasound?

All of the above

Learn the basics of ultrasound imaging, including its definition, biological effects, imaging principles, and clinical applications. Understand the different modes of ultrasound and how they are used in medical imaging.

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