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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