Mechanical transducer Study guides, Class notes & Summaries

SPI ARDMS EXAM |Q & A |ALREADY GRADED A+ |2024 UPDATE What type of wave is sound? Correct Ans ~ mechanical and longitudinal The frequency ranges for ultrasound are: Correct Ans ~ >20 kHz The speed of sound in soft tissue is: Correct Ans ~ 1540 m/s which of the following transducers fires the elements in groups? A. Linear sequenced array B. Phased array C. Continuous-wave transducer D. Single-element transducer Correct Ans ~ A Enhancement is caused by** Correct Ans ~ weakly attenuati...

The paper speed used with EFM in North America is: a. 1cm/min b. 2cm/min c. 3cm/min - C. 3cm/min The US transducer on the EFM measures the a. Electrical signal of the fetal heart b. Mechanical movement of the fetal heart reflected off of sound waves c. R to R intervals of the fetal heart - b. Mechanical movement of the fetal heart reflected off of sound waves The purpose of the autocorrelation in external monitoring is to a. Compare incoming waveforms for comparison b. Decrease signal...

arterial puncture correct answer: puncture of a peripheral artery to obtain an arterial blood sample for direct measurement of pH, PaCO2, PaO2 indications for arterial puncture correct answer: evaluation of the adequacy of a patients ventilation (PaCO2), oxygenation (PaO2) and/or acid base status (pH) assess the need for therapeutic intervention (i.e., oxygen therapy, mechanical ventilation, etc) and/or diagnostic evaluation (i.e., exercise desaturation) monitor the severity and pro...

ARDMS SPI STUDY GUIDE QUESTIONS AND ANSWERS ALREADY PASSED In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... Remain the Same because stiffness and density affect Propagation Speed. What is the audible range? 20-20,000Hz >20,000Hz=Ultrasound Frequency is measured in Hertz (Hz) is Cycles per Second Not affected by sonographer Increase Frequency; Decrease Depth A period is the length of time it takes for one complete wavelength to pass a fixed poin...

Sonography Principles and Instrumentation - ARDMS SPI Multiple Choice Exam Questions and Answers-A mechanical transducer utilizes: a. transmit focus b. receive focus c. fixed focus d. dynamic aperture focusing - c. fixed focus; sonographer cannot determine the location of # of foci. mechanical transducer uses cross sectional imaging, rotating wheel, wobbler, oscillating mirror A reflection will occur at the boundary of two media if the acoustic impedences of the two media are: a. equal ...

Edelman SPI review questions & Answers 2023. ______ is the distance covered by one cycle. a) pulse length b) wavelength c) cycle distance d) cycle duration ______ is the time to complete one cycle a) pulse duration b) pulse period c) period d) duration period ________ is a redirection of an ultrasound bean in many directions as a result of a rough boundary between two media: a) refraction b) Rayleigh Scattering c) scattering d) reflection _________ resolution is...

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...

SPI URR MOCK EXAM 1 | 164 QUESTIONS AND CORRECT DETAILED ANSWERS | UPDATED ____ is defined as specific area or location where Doppler shift info is being obtained. A. spectral broadening B. nyquist limit C. sample volume D. spectral window - ANSWER C. sample volume Spatial resolution is: A. the minimum reflector separation required to produce separate echos. B. highest with linear phased arrays. C. the weakest reflected signal the transducer can receive D. another term for slice thi...

____ is defined as specific area or location where Doppler shift info is being obtained. A. spectral broadening B. nyquist limit C. sample volume D. spectral window -answer- C. sample volume Spatial resolution is: A. the minimum reflector separation required to produce separate echos. B. highest with linear phased arrays. C. the weakest reflected signal the transducer can receive D. another term for slice thickness resolution -answer- A. the minumum reflector separation required to pr...

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 ...