Ultrasound transducer - Study guides, Class notes & Summaries

SPI Practice Test Questions With 100% Correct Answers Which of the following do the source and the medium determine? a. duty factor b. frequency c. propagation speed d. axial resolution - ANS-d. Axial resolution is affected by all of the following EXCEPT a. frequency b. damping c. spatial pulse length d. focusing - ANS-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 ...

An in depth summary of the "Biomedical Imaging (BMs23 course)". This summary contains all material discussed in the course and you should easily pass the exam using this. In addition, this summary can be used outside this course for a clear and complete description of MRI, ultrasound, PET, SPECT, X-ray, CT, and mammography, as well as the mechanisms behind them. See the content list for the complete overview. Some important concepts that are described are: fluorescence, tomosynthesis, t1, t2, t2...

Frequencies used in transthoracic imaging are usually in the range of ____________. Frequencies used in transesophageal imaging are usually in the range of ______________. A) 3-6 MHz;6-8 MHz B) 3-6 MHz; 5-7 MHz C) 2.5-4 MHz; 5-7 MHz D) 1-3 MHz; 6-8 MHz - 2.5-4 MHz; 5-7 MHz Which of the following will aid in visualization of the endocardium? A) Increased transducer frequency B) Larger sector size C) Increased wall filter D) Agitated saline contrast - Increased transducer frequency-this ...

This image was obtained with a linear array transducer. The trapezoidal field of view increases the field of view. How is the trapezoidal shape created? See image for question #244 A. Electronic beam steering B. Side lobes C. Grating lobes D. Mechanically steering the elements E. Mirror CORRECT ANSWERS: A. Electronic beam steering <A trapezoidal image can be obtained with a linear array transducer by electronically steering the beam> What advantage is related to the use...

reflection return of the ultrasound wave to the transducer from a smooth surface when does the greatest amount of reflection occur when the incident beam is perpendicular to structure (specular reflection) scatter deflection of ultrasound waves from small structures (red blood cells scatter sound) refraction deflection of Ultrasound waves due to media with varied acoustic impedance attenuation loss of Ultrasound signal due to absorption in tissues as it travels ...

C - Answer- What is dynamic aperture? A.aperture that varies with transmit frequency B.aperture that decreases as a function of time C.aperture that increases with increasing focal length D.aperture that changes as a function of frame rate A - Answer- to which acoustic variable is penetration depth inversely related? A.frequency B.wavelength C.period D.propagation speed B - Answer- which imaging mode requires a broadband transducer? A.continuous wave doppler B.Pulsed wave dopple...

When does simplified Bernoulli equation not apply in aortic valve assessment? Ans- When proximal velocity is > 1.5 m/sec Doppler frequency shift equation Ans- Doppler shift = (2 x velocity of sample relative to source x transducer frequency x cos[θ]) / speed of sound in the tissue Will lower or higher transducer frequency minimize aliasing? Ans- Lower frequency, because for the same detected velocity, the frequency shift will be lower in absolute magnitude for a lower-frequency tran...

Transducer contains a large number of rectangular piezoelectric elements arranged in a linear pattern - sector phased array increasing the line density will _______ # of pulses per frame, improve spatial resolution (axial and lateral), __________ frame rate and ___________ temporal resolution. increase/decrease? - increases, decreases, decreases a wave that requires a medium through which to travel, cannot travel in a vacuum - mechanical wave transducer that requires mechanical focusing a...

The main advantage of a curvilinear transducer over a vector transducer is: A. the ability to perform CW Doppler with 2D imaging B. the smaller footprint C. the wider near field D. the ability to scan at increased frame rates - the wider near field Which of the following describes the primary advantage of a 1.5D array over a 1D array? A. the 1.5D array eliminates the need for a stand-off pad for superficial imaging B. the 1.5D array can produce a trapezoid field of view while the 1D array...

NCC Electronic Fetal Monitoring Certification Exam 2024/2025 (100%Verified Answers) Graded A. Which of the following factors can have a negative effect on uterine blood flow? a. Hypertension b. Epidural c. Hemorrhage d. Diabetes e. All of the above - CORRECT ANSWERS e. All of the above How does the fetus compensate for decreased maternal circulating volume? a. Increases cardiac output by increasing stroke volume. b. Increases cardiac output by increasing it's heart rate. c. Increases ...