Attenuation of sound - Study guides, Class notes & Summaries

- greatest contributor to attenuation in tissues - Potential source of bio-effects (discussed later) acoustic speckle - noise resulting from the constructive and destructive interference of small sound wavelets -grainy appearance Amplitude - -For a wave or vibration, the maximum displacement on either side of the equilibrium (baseline) position. - positive amplitudes (above baseline) and negative amplitudes (below baseline) -units that are appropriate to the acoustic variable considered ...

Sound waves are: - longitudinal, mechanical The speed of sound in soft tissue is closest to: - 1,500 m/s The frequency closest to the lower limit of ultrasound is: - 15,000 Hz Which is not an acoustic variable? - intensity The effects of soft tissue on ultrasound are called: - acoustic propagation properties All of the following are true EXCEPT: - two waves with identical frequencies must interfere constructively Put in decreasing order: deci, deca, micro, centi - deca, deci, c...

Which is described as the ability of an object to resist compression and relates to the harness of a medium a stiffness b density c pressure d inertia a Stiffness An increase in PRF would lead to a an increase in DF b a decrease in PD c an increase in the number of cycles d decrease in resolution a an increase in DF Which of the following would have the highest propagation speed a air b bone c soft tissue d water b bone As imaging depth increases, PRF must: a...

ESP X-Zone Practice Test Questions And Answers Which of these factors has the greatest influence on pulse repetition period? a. thickness of PZT crystal b. displays dynamic range c. display depth d. impedance of the medium e. attenuation of the sound beam c. display depth A sound wave with a frequency of 5 MHz is traveling in soft tissue. What is the wavelength of this sound? a. 0.3mm b. 5mm c. 0.5mm d. 0.3cm e. 0.5m a. 0.3mm What is the accuracy of reflector depth posi...

What is an artifact? not true representation of our patients anatomy or a structure in the image that does not correlate directly with actual tissue Artifacts include missing reflectors structures not representative of tissue spatial misregistration of reflectors In other words artifacts include reflections that are not real, not seen on the image, incorrect size/shape, incorrect position and incorrect brightness Artifacts occur because an error occurs somewhere in t...

Which of the following do the source and the medium determine? a. duty factor b. frequency c. propagation speed d. axial resolution - d. Axial resolution is affected by all of the following EXCEPT a. frequency b. damping c. spatial pulse length d. focusing - d. Damping in a transducer a. reduces the number of cycles in a pulse and increases the quality factor b. increases the number of cycles in a pulse and increases penetration c. causes poor axial and lateral resolution ...

ARDMS SPI Exam |Complete Questions with Correct Answers Graded A+ When the direction of the wave propagation is parallel to the particle motion of the medium, the wave being transmitted is called a: A) surface wave. B) longitudinal wave. C) transverse wave. D) non-linear sound. B) longitudinal wave If the sound beam attenuated 6 dB, what will happen to the overall intensity? A) Quadrupled B) Doubled C) Halved D) Quartered D) Quartered Frequency increased from 3 MHz to 6 MHz,...

ATP CTP Course - Final Test Questions and Answers 2022. Which of the following statements regarding energy is true? The objective in maneuvering the airplane is to manage energy so that: What is the effect on total drag if airspeed slows below L/D Max? A jet pilot flying at L/D Max will obtain best: When a jet aircraft is flown at the appropriate airspeed for maximum range, which type of drag predominates? While already at high speed, what happens if Mach is allowed to incr...

Sonography Canada Core Review Exam 2023. f - ANSWER v/wavelength frequency - ANSWER number of cycles per second T - ANSWER 1/f Period - ANSWER length of time for one cycle 1540 m/s - ANSWER speed of sound in soft tissue infrasound - ANSWER <20Hz audible sound - ANSWER 20Hz-20,000Hz ultrasound - ANSWER >20,000Hz c - ANSWER = root (bulk modulus/density) or =stiffness/density bulk modulus - ANSWER stress/strain I - ANSWER = P/a P - ANSWER = E/T Amplitude - ANSWER maximum deviat...

Which of these factors has the greatest influence on pulse repetition period? a. thickness of PZT crystal b. displays dynamic range c. display depth d. impedance of the medium e. attenuation of the sound beam c. display depth A sound wave with a frequency of 5 MHz is travelling in soft tissue. What is the wavelength of this sound? a. 0.3mm b. 5mm c. 0.5mm d. 0.3cm e. 0.5m a. 0.3mm