Amplitude prp and prf - Study guides, Class notes & Summaries

what is the I SPPA for mechanical bioeffects? -ANSWER 190W/cm^2 what is the I SPTA for thermal bioeffects? -ANSWER 720mW/cm^2 recommended MI for fetal scanning -ANSWER MI < 1.9 recommended TI for fetal scanning -ANSWER TI < 0.7 after what fetal age is safe to use PW doppler? -ANSWER 14 weeks what does ALARA stand for -ANSWER as low as reasonably achievable frequency -ANSWER # of cycles/second f = 1/p period -ANSWER time it takes for 1 cycle to occur (usec) P = 1/f ...

SPI Exam Review Questions And Answers (Updated And Verified) Ultrasound imaging type in which pulses are reflected and used to produce a display - answerpulsed wave brightness of the dots on image - answeramplitude round-trip travel time per cm in soft tissue - answer13 microseconds A line produced on a display that represents ultrasonic echoes returning from the body. A sonographic image is composed of many such lines. - answerscan line Type of image presented in a rectangular format. ...

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 deviation from normal ...

What is enhancement caused by? - ANS weakly attenuating structures What is the multipath artifact? - ANS artifact caused by the sound beam bouncing off several different reflectors What is the typical value of PRF in diagnostic ultrasound? - ANS 1000-10,000 Hz or 1-10 KHz What are specular reflections? - ANS reflections that occur when the sound impinges upon a large, smooth reflector at a 90 degree angle. What are non-specular reflections? - ANS ...

ARDMS SPI STUDY GUIDE QUESTIONS AND ANSWERS 2023 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 ...

what is the I SPPA for mechanical bioeffects? -ANSWER 190W/cm^2 what is the I SPTA for thermal bioeffects? -ANSWER 720mW/cm^2 recommended MI for fetal scanning -ANSWER MI < 1.9 recommended TI for fetal scanning -ANSWER TI < 0.7 after what fetal age is safe to use PW doppler? -ANSWER 14 weeks what does ALARA stand for -ANSWER as low as reasonably achievable frequency -ANSWER # of cycles/second f = 1/p period -ANSWER time it takes for 1 cycle to occur (usec) P = 1/f ...

What are the 6 major components of the ultrasound system? - ANSWER--Transducer -Pulser and beam former -Receiver -Display -Storage -Master synchronizer What do the Pulser and Beam former do? - ANSWER-Create and control the electrical signals sent to the transducer to generate sound pulses What does the Pulser determine? - ANSWER-Amplitude, PRP and PRF What happens when the Pulser's spike is set to LOW voltage? - ANSWER-Slight PZT vibration transmits weak sound beam--> Reflecte...

ARDMS SPI EXAM STUDY GUIDE 180 Questions with Verified Answers In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... - CORRECT ANSWER Remain the Same because stiffness and density affect Propagation Speed. What is the audible range? - CORRECT ANSWER 20-20,000Hz >20,000Hz=Ultrasound Frequency is measured in - CORRECT ANSWER Hertz (Hz) is Cycles per Second Not affected by sonographer Increase Frequency; Decrease Depth A period is t...

what is the I SPPA for mechanical bioeffects? -ANSWER 190W/cm^2 what is the I SPTA for thermal bioeffects? -ANSWER 720mW/cm^2 recommended MI for fetal scanning -ANSWER MI < 1.9 recommended TI for fetal scanning -ANSWER TI < 0.7 after what fetal age is safe to use PW doppler? -ANSWER 14 weeks what does ALARA stand for -ANSWER as low as reasonably achievable frequency -ANSWER # of cycles/second f = 1/p period -ANSWER time it takes for 1 cycle to occur (usec) P = 1/f ...

ARDMS practice Test 100 Questions with Verified Answers Sonographers should be aware of work-related musculoskeletal disorders. Best practice while scanning is to avoid abducting the arm more than how many degrees? a. 50 b. 90 c. 30 d. 40 - CORRECT ANSWER c. 30 Which action demonstrates best practice during ultrasound exams regarding the ALARA principle? a. The exposure time should be extended during the exam. b. use the lowest possible output power that provides a diagnostic image. ...