Propagation speed - Study guides, Class notes & Summaries

The time from the beginning of a pulse until its end is ______________? - ️️pulsed duration If the frequency of US is increased from 0.77MHz to 1.54MHz, what happens to the propagation speed? - ️️remains the same All of the following are true EXCEPT: - ️️two waves with identical frequencies must interfere constructively As a result of ______________, the propagation speed increases - ️️decreasing compressibility and density Sound waves are: - ️️longitudinal, mechanica...

Sound waves are: a) electric b) mechanical, transverse c) spectral d) longitudinal, mechanical -answers - D The speed of sound of ultrasound in soft tissue is closest to: a) 1,540 km/sec b) 1.54 km/sec c) 1,500 m/s d) 1,540 mm/sec -answers - C Which is not an acoustic variable? a) density b) pressure c) distance d) intensity -answers - D The effects of soft tissue on ultrasound are called: a) acoustic proliferation properties b) dynamic effects c) acoustic pr...

Definition of Duty Factor? - ️️The percentage of time the pulse is on -Unitless (just a number) -For continuous wave, duty factor = 100% -For pulsed wave, Duty Factor is less than 1% What are the two types of Ultrasound Waves? - ️️1.) Electromagnetic - Wave travels through a vacuum. 2.) Mechanical - Wave must travel through a medium. Meaning of Anechoic? - ️️Dark, less echos. Meaning of Echogenic? - ️️Full of echoes. Meaning of Hyperechoic? - ️️More echoes than adjac...

2024 ARDMS SPI EXAM LATEST VERSION WITH 200+ QUESTIONS AND CORRECT VERIFIED ANSWERS/ ARDMS SPI EXAM PREP GUIDE (QUESTIONS WITH CORRECT ANSWERS) The range for ultrasound begins: a. 20 Hz b. 20,000 Hz c. 2 MHz d. 15 MHz - ANSWER-b. 20,000 Hz (useful frequency range for clinical imaging is 2MHz-10MHz) Increasing wavelength will ___________ frequency. a. increase b. decrease c. not change d. cannot be predicted. - ANSWER-b. decrease The Nyquist Limit is equal to: a. propagation sp...

ARDMS SPI REAL EXAM WITH QUESTIONS AND ANSWERS LATEST UPDATES An increase in the number of pixels on the display will improve: - ANSWER-detail resolution Propagation speed is determined by: a. frequency b. harmonics c. bandwidth d. bulk modulus - ANSWER-d. bulk modulus Increasing transmit gain increases everything except: - ANSWER-frequency The correct depth placement of reflectors depends primarily upon: a. frequency b. period c. power d. propagation speed - ANSWER-d. propagatio...

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...

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...

ARDMS SPI EXAM STUDY GUIDE – With Questions & Answers (Rated A+) ARDMS SPI EXAM STUDY GUIDE – With Questions & Answers (Rated A+) In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... - ANSWER - Remain the Same because stiffness and density affect Propagation Speed. What is the audible range? - ANSWER - 20-20,000Hz >20,000Hz=Ultrasound Frequency is measured in - ANSWER - Hertz (Hz) is Cycles per Second Not affected by sonographer ...

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,...

) variables A wave is a traveling variations in quantities called wave _________________. A) length B) variables C) cycles D) periods D) acoustic Sound is a traveling variations in quantities called _________________ variables. A) wave B) pressure C) density D) acoustic C) 20,000 Ultrasound is a sound with a frequency greater than ____________ Hz. A) 2 B) 15 C) 20,000 D) 1540 D) pressure, density Acoustic variables include __________________, ____________, and part...