We need to define new parameters: pulse-repetition frequency, pulse-repetition period, pulse duration, duty factor, spatial pulse length. the ultrasound image and the medium it is traveling through. 1. Would each of the following parameters increase, decrease or remain the same? remains same A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. No other controls are adjusted. The pulse repetition frequency (PRF) is the number of pulses of a repeating signal in a specific time unit, normally measured in pulses per second.The term is used within a number of technical disciplines, notably radar.. If all other factors remain unchanged, what happens to the duty factor (increases, decreases, or remains the same) when the monographer uses a new transducer with a longer pulse duration? C. 6 Hz: pulse repetition period is the reciprocal of pulse repetition frequency. PRP is the time from the start of one pulse, to the start of the next pulse. A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. intensity, A sonographer is using a 3MHz transducer and changes to a 6 MHz transducer. 80 us C. 8000 ns D. 800 ms: Definition. 1. a. speed b. number c. type d. cycle b. number 10 All of the following are acoustic variables except _____: a. pressure b. density c. compression d. particle vibration c. compression. power, A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. Would each of the following parameters increase, decrease or remain the same? Two transducers send ultrasound pulses into soft tissue. We report on CPA-free multipass amplification of ps-pulses in Holmium-doped yttrium lithium fluoride (Ho:YLF) crystals up to µJ pulse-energy-covering repetition rates from 10 kHz up to 500 kHz. 1/seconds c. mm/us d. seconds^-2. remains same A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. 1-9 exam questions at Cram.com. DECREASES: Pulse duration is the _____ it takes for a pulse … It is determined by the number of cycles and the period of each cycle. frequency, A sonographer adjusts the depth view of an ultrasound scan from 8 cm to 16 cm. No other controls are adjusted. Start studying Module 2; Pulsed Echo Instrumentation. B. We typically measure PRI as the time from the beginning of one pulse and the beginning of the next. Pulse Repetition Indicates the Pulse Repetition period Hz or ms The Pulse from ELECTRIC 103 at Bülent Ecevit University - Zonguldak Vocational School true or false. Pulse Repetition Frequence (PRF) is the number of _____ occuring in 1 second. At the pulse repetition frequency. … A comprehensive database of more than 13 ultrasound physics quizzes online, test your knowledge with ultrasound physics quiz questions. While using a particular imaging system, what happens to the duty factor when the depth of view increases? Period (DF= PD/PRP) What is the SPL of a 4 cycle pulse with a wavelength of 0.1mm ? High temporal resolution is obtained when the pulse repetition period is short; this is achieved by a high pulse repetition frequency when the depth of penetration is shallow. Pulse Repetition Frequency (PRF) What are the acoustic variables? b. decreases. c. 5 ms: the pulse with the shortest pulse duration will have the highest pulse repetition frequecny. pulse duration, A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. Which of the following four waves has the lowest pulse repetition frequency? The basic unit of measure for PRF is hertz (Hz). Pulse Repetition Frequency (PRF) is the reciprocal of PRI. The lowest pulse repetition frequency is the longest pulse repetition period. Four waves have pulse repetition periods as listed below. Would each of the following parameters increase, decrease or remain the same? PRF, A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. Would each of the following parameters increase, decrease or remain the same? b. Time of the transmitted pulse B. Each pulse contains 4 cycles. The imaging depth remains unchanged. This is the electronics engineering questions and answers section on 'Radar Engineering and Satellite Communication' with the option for disscussion in forum , usefull for competitive examination and entrance test like GATE ESE PSU. The pulse duration depends on several parameters: the type of gain medium and how much energy it can store, the cavity length, the repetition rate of the pulses and the pump energy, to mention the most important ones. Cram.com makes it easy to get the grade you want! Would each of the following parameters increase, decrease or remain the same? pulse transmission of random binary data Option (c) 19.The signal to quantization noise ratio in an n-bit PCM system (a) depends upon the sampling frequency employed (b) is independent of the value of ‘n’ (c) increasing with increasing value of ‘n’ (d) decreases with the increasing value of ‘n’ [GATE 1995: 1 Mark] what happens to the pulse repetition period if the sonographer decreases the maximum imaging depth achieved in an ultrasound scan a. increases b. decreases c. remains the same d. cannot be determined. The pulse rate may fluctuate and increase with exercise, illness, injury, and emotions. _______ is the time from the start of a pulse to the end of that pulse, _________ is the time from the start of a pulse to the start of the next pulse, pulse repetition frequency is the reciprocal of, By changing the imaging depth, which of the following does the operator also change, The speed of 5 MHz continuous wave is 1.8 km/sec. Since PRP includes Pulse Duration and Listening Time, they are directly related. False: two waves can never have identical PRFs if their pulse repetition period are different, T or F: Two waves can have identical PRFs even if their periods are different, True. Would each of the following parameters increase, decrease or remain the same? A. This example generates a pulse train using the default rectangular pulse of unit width. Ubertone’s profilers allow to make accurate velocity and echo amplitude profile measurements at high spatial and high time resolution.. Our technology is inspired from medical imaging and oceanographic sonar and also known as UVP (Ultrasonic Velocity Profiler) or UDV (Ultrasonic Doppler Velocimeter) A. No other controls are adjusted. What is the duty factor if the pulse duration is 1 us and the pulse repetition period is 1 us? The frequency is increased Definition: 1. 1. period 2. number of cycles in the pulse. Pulses: Pulse Repetition _____ is the time from the beginning of one pulse to the beginning of the next. intensity, A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. It is typically measured as cycles per second or hertz (Hz).. Would each of the following parameters increase, decrease or remain the same? period, A sonographer is using a 3MHz transducer and changes to a 6 MHz transducer. It is typically measured as cycles per second or hertz (Hz).. DECREASES: Pulse duration is the _____ it takes for a pulse … Definition. No other controls are adjusted. Females ages 12 and older, in general, tend to have faster heart rates than do males. No other controls are adjusted. Increase the pulse duration C. Increase the operating frequency D. Increase the power: C. Increase the operating frequency: What is the best estimate of axial resolution? E. The pulse repetition period is similar to the period. Usually expressed in microseconds (µs). Would each of the parameters increase, decrease or remain the same? What is the pulse repetition period? Spaced repetition is a method where the subject is asked to remember a certain fact with the time intervals increasing each time the fact is presented or said. Pulse repetition period (PRP): Time from the beginning of one pulse to the beginning of the next. We have applied a simple approach to analyze behavior of the harmonically mode-locked fiber laser incorporating an adjustable Mach-Zehnder interferometer (MZI). 4.0 mm 4. Would each of the parameters increase, decrease or remain the same? The measure is typically used with electrical signals and is widely used in the fields of radar and power supplies.There are two closely related measures. Solved examples with detailed answer description, disscussion in forum helps in easy to understand concepts. Wavelength, A sonographer is using a 3MHz transducer and changes to a 6 MHz transducer. Pulse repetition frequency (PRF) indicates the number of ultrasound pulses emitted by the transducer over a designated period of time. Motoman sk6 manual The result is a pulse with a very sharp raising time and a slower falling time, with a typical duration of 1 to 200 ns. PRF is controlled automatically in sonographic instruments, but operator may control it in Doppler instruments (more on this later). We report on the experimental observation of the period doubling of multiple dissipative-soliton-resonance (DSR) pulses in an all-normal-dispersion fibre laser, based on a nonlinear amplifying loop mirror. Increase the pulse repetition frequency B. It covers the fundamental science, signal processing, hardware issues, systems design and case studies of typical systems. 1/seconds. The pulse duration is longer than the pulse repetition period. Pulse repetition frequency (PRF) refers to the _____ of pulses occurring in one second. No other controls are adjusted. Would PULSE REPETITION PERIOD increase, decrease, or remain the same? b. Study pulse sequences flashcards from William Kerns's Lake Michigan College class online, or in Brainscape's iPhone or Android app. remains the same. pulse repetition period, A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. Learn faster with spaced repetition. A. Time of the pulse / listen time: What is the purpose of the backing material? Which of these four pulses with PRFs listed below has the shortest pulse repetition period? Pulse Repetition Frequency (PRF) Pulse Repetition Frequency (PRF) of the radar system is the number of pulses that are transmitted per second. Pulse Repetition Period & Pulse Repetition Frequency (PRP & PRF) Pulse Repetition Period Pulse Repetition Period Components of PRP: Definition: the transmit time or on time (aka pulse duration) the receiving time or off time Pulse repetition period is the length of time from the Pulse Repetition Frequence (PRF) is the number of _____ occuring in 1 second. frequency, A sonographer is using a 3MHz transducer and changes to a 6 MHz transducer. .4cm 3. Would each of the parameters increase, decrease or remain the same? Period : Pulse Repetition Period (PRP) _____ as PRF INCREASES. Amplitude, A sonographer adjusts the depth view of an ultrasound scan from 8 cm to 16 cm. This answer has the highest pulse repetition frequency and, thus, the shortest pulse repetition period. Would each of the following parameters increase, decrease or remain the same? A. Would each of the following parameters increase, decrease or remain the same? Pulse repetition frequency (PRF): Number of pulses occurring in 1 s. Usually expressed in kHz. True or False, ultrasound waves can be polarized? The dimensions of the rectangle depend upon the pulse length, the beam width and the spot size. Which of these four values for pulse repetition frequency would have the longest pulse repetition period? This is the electronics engineering questions and answers section on 'Radar Engineering and Satellite Communication' with the option for disscussion in forum , usefull for competitive examination and entrance test like GATE ESE PSU. The pulse width is a measure of the elapsed time between the leading and trailing edges of a single pulse of energy. Increasing the frequency decreases the period. 4000 Hz c. 6 Hz d. 1kHz . true or false. For example, a pulse length of 1 micro second would stretch the target by 150 metres (distance that an … C. 8000 ns. 1. A. Pulse Duration, Pulse Repetition Period (PRP), Pulse Repetition Frequency (PRF), Duty Factor and Spatial Pulse Length. 21. period, A sonographer adjusts the depth view of an ultrasound scan from 8 cm to 16 cm. More pulses occur in a second, less time from one to the next. Period and pulse repetition frequency are unrelated, T or F: Two waves can have identical PRFs, even if their frequencies are different, True. what are the units of pulse repetition frequency (prf) a. seconds b. A comprehensive database of more than 13 ultrasound physics quizzes online, test your knowledge with ultrasound physics quiz questions. In diagnostic imaging what determines the spatial pulse length? frequency, A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. D. The pulse duration is similar to the listening time. A. True. The other three are associated with deep imaging. Pulse repetition frequency (PRF) In order to build up a discernible echo, most radar systems emit pulses continuously and the repetition rate of these pulses is determined by the role of the system. If the pulse duration is 4us and the pulse repetition period is 400us, the duty factor would be _____% 2.0. Pulses: Pulse Repetition _____ is the time from the beginning of one pulse to the beginning of the next. It decreases . The lowest pulse repetition frequency is the longest pulse repetition period. Pulse duration will increase with all the following except? C. At the transmitted frequency. Term. the duty factor is a characteristic of an ultrasound and transducer system and does not change as long as the system components remain unchanged. No other controls are adjusted. Spaced repetition is a method where the subject is asked to remember a certain fact with the time intervals increasing each time the fact is presented or said. a. pulse repetition period, b. prf, d. duty cycle, which of the following terms does not belong with the others, what is the importance of describing sound beam intensities in a variety of ways with regard to space and time, b. it's important when studying bioeffects, which intensity is more closely correlated to tissue heating. Which of the following best describes the spatial pulse length? Would each of the following parameters increase, decrease or remain the same? C. 6 Hz Pulse repetition period is the reciprocal of pulse repetition frequency. What is PRF in radar? No other controls are adjusted. 11 The fraction of time that pulsed ultrasound is on is called ____. Which of the following four waves has the lowest pulse repetition frequency. Pulse Width (PW) is the elapsed time between the rising and falling edges of a single pulse. False 3. 1.00mm. T or F: Two waves can have identical pulse repetition frequencies, even if their pulse repetition periods are different. speed, A sonographer is using a 3MHz transducer and changes to a 6 MHz transducer. Would each of the parameters increase, decrease or remain the same? Would each of the following parameters increase, decrease or remain the same? Radar systems radiate each pulse at the carrier frequency during transmit time (or Pulse Width PW), wait for returning echoes during listening or rest time, and then radiate the next pulse, as shown in the figure. Would each of the parameters increase, decrease or remain the same? Pulse Duration is defined as the time that the pulse is on. On what does the pulse repetition period depend on? Would the pulse repetition period increase, decrease of remain the same? Would PERIOD increase, decrease, or remain the same? (1.5 x 10 -6 seconds) x (8 x 10 3 second -1 ) = 0.012 The duty cycle is the ratio of average power to peak power. If the wavelength is 0.5mm, the spatial pulse length for a 4 cycle pulse is _____mm. Pulse Repetition Interval (PRI) is the time between sequential pulses. B. Study Flashcards On Ultrasound Physics chapt. As follows from the presented values, an increase in the pulse repetition period [T.sub.imp] leads to a decrease in the temperature excesses of both the inductor and … Location of sample volume (SV) and the resulting spectral curve (pulsed wave Doppler). In other words, wavelength is simply the ratio of velocity to frequency or the product of velocity and the period. 1/2 the beam width B. Pulse Repetition Interval (PRI) is the time between sequential pulses. If the subject is able to recall the information correctly the time is doubled to further help them keep the … Just below the threshold of visibility. In medical ultrasound the typically used range of PRF varies between 1 and 10 kHz 1.. A number of artifacts are directly influenced by the pulse repetition frequency, e.g. If all other factors remain the same, what happens to duty factor if the sonographer changes to a transducer with a longer pulse duration? What also changes. The gain factor is a sinusoid of frequency 0.05 Hz. 100 microseconds to 1 millisecond: Term. PRF, A sonographer is using a 3MHz transducer and changes to a 6 MHz transducer. No other controls are adjusted. If all other factors remain unchanged, what happens to the duty factor (increases, decreases, or remains the same) when imaging the imaging depth increases? half a period of the driving 10 GHz source. A. Since PRP includes Pulse Duration and Listening Time, they are directly related. c. wavelength x number of cycles in the pulse. Pulse repetition frequency (PRF) indicates the number of ultrasound pulses emitted by the transducer over a designated period of time. A sonographer adjusts the depth view of an ultrasound scan from 8 cm to 16 cm. Think: increasing the depth means the listening time will be increased cuz it's traveling deeper. Would each of the parameters increase, decrease or remain the same? Would each of the following parameters increase, decrease or remain the same? Would each of the following parameters increase, decrease or remain the same? duty factor, A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. Wavelength, A sonographer adjusts the depth view of an ultrasound scan from 8 cm to 16 cm. At the pulse repetition frequency. The seed pulses at a wavelength of 2.05 µm are provided by a Ho-based all-fiber system consisting of a soliton oscillator and a subsequent pre-amplifier followed by a free-space AOM as pulse-picker. pulse repetition period, A sonographer is using a 3MHz transducer and changes to a 6 MHz transducer. If all other factors remain unchanged, what happens to the duty facto (increases, decreases or remains the same) when the pulse repetition frequency increases? Would PULSE REPETITION PERIOD increase, decrease, or remain the same? B. A. the pulse duration of an ultrasound and transducer system does not change significantly as long as the system components remain unchanged, the pulse duration is expressed in the same units as the, true or false, a sonographer can adjust the duration of an acoustic pulse since it depends upon the pulse's propagation speed, true or false, a sonographer can adjust the duration of an acoustic pulse since it depends upon the maximum imaging depth, true or false, the sonographer cannot change the duration of a sound pulse unless the transducers are switched, d. period multiplied by the number if cycles in the pulse, what happens to the pulse duration when a sonographer decreases the maximum imaging depth in an ultrasound scan, the spatial pulse length describes certain characteristics of an ultrasound pulse, what are its units, in diagnostic imaging, what determines the spatial pulse length, which of the following best describes the spatial pulse length, c. wavelength multiplied by the number of cycles in the pulse. PRP is the time from the start of one pulse, to the start of the next pulse. The spatial pulse length describes certain characteristics of an ultrasound pulse. No other controls are adjusted. Would each of the following parameters increase, decrease or remain the same? Would each of the parameters increase, decrease or remain the same? Using a specific transducer, what happens to the spatial pulse length as the sonographer increases the maximum imaging depth? Pulse repetition period is determined by: Definition. True 4. This book is a practitioner's guide to all aspects of pulse Doppler radar. No other controls are adjusted. .4mm 2. spatial pulse length, A sonographer adjusts the depth view of an ultrasound scan from 8 cm to 16 cm. Because traveling through the same medium, What is the duty factor if the pulse duration is 1 microsecond and the pulse repetition period is 1 ms. What is the duty factor if the pulse duration is 1 millisecond and the pulse repetition period is 1 second? remains same A sonographer is using a 3 MHz transducer and increases the output … PRF, A sonographer adjusts the depth view of an ultrasound scan from 8 cm to 16 cm. Four waves have pulse repetition periods as listed below. Pulse repetition frequency (PRF) The number of ultrasound pulses sent per second is called pulse repetition frequency (PRF).PRF is determined by the speed of sound and the distance it must travel. In clinical imaging, a pulse is comprised of 2-4 cycles and the pulse duration is usually between 0.5 to 3 microseconds. duty factor, A sonographer adjusts the depth view of an ultrasound scan from 8 cm to 16 cm. No other controls are adjusted. Frequency and pulse repetition frequency are unrelated, T or F: PRF and pulse repetition period are determined only by the imaging depth. PRP decreases as PRF increases. By increasing the pump power, the transition from a single DSR pulse to multiple DSR pulses was observed, in addition to the typical linear pulse broadening, under a fixed pulse peak power. This method is based on the intermittent repetition effect on how we tend to forget information. The imaging depth remains unchanged. The duty factor will increase with all of the following except. speed, A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. This choice has the lowest pulse repetition frequency and, thus, the longest pulse repetition period. D. 800 ms. A. Pulse duration does not change with depth, thus it cannot be changed by the sonographer. 8 s. B. true or false. Four pulses have pulse repetition periods as listed below. Which of the following terms does not belong wit the others? As imaging depth increases, pulse repetition period (PRP) increases ↑ Imaging Depth ↑ PRP. Which of these four values for pulse repetition frequency would have the longest pulse repetition period? One transducer emits sound with a 4 MHz frequency and the other produces sound at a 6 MHz frequency. False Term: While using the same ultrasound machine and transducer, which of the following can a sonographer alter? If all other factors remain unchanged, what happens to the duty factor (increases, decreases or remains the same) when the pulse repetition increases? Learn faster with spaced repetition. C. The duty factor has a value close to 1. T or F: while imaging soft tissue, the spatial pulse length does not change as long as the components of the ultrasound system are the same. Typical values for pulse repetition period: Definition. What are the units? For M-mode or B-mode, what is the optimum time-based brightness setting? The attenuation of a 7MHz transducer in soft tissue would be _____ dB at 6cm of depth. Time of the pulse / listen time C. Time of one cycle in the transmitted pulse D. Time to receive echo from the depth of the scan range : B. In radar, a radio signal of a particular carrier frequency is turned on and off; the term "frequency" refers to the carrier, while the PRF refers to the number of switches. 3.Frequency 4. This answer has the highest pulse repetition frequency and, thus, the shortest pulse repetition period. pulse duration, A sonographer adjusts the depth view of an ultrasound scan from 8 cm to 16 cm. What is the spatial pulse length in soft tissue for a four-cycle pulse, using a frequency of 6.0MHz? A. C. 6 Hz: pulse repetition period is the reciprocal of pulse repetition frequency. Our model is able to describe key features of the laser outputs and explore limitations of physical mechanisms responsible for laser operation at different pulse repetition rates tuned over a whole GHz range. spatial pulse length, A sonographer is using a 3 MHz transducer and increases the output power to visualize structures that are positioned deeper in the patient. Period : Pulse Repetition Period (PRP) _____ as PRF INCREASES. The amount of time that pulsed ultrasound is actually on is the... a) pulse duration b) frame rate c) spatial pulse length d) pulse repetition frequency. the pulse repetition frequency and the frequency are unrelated, what is a typical value for the duty factor of pulsed sound waves used in diagnostic imaging, what is the value of the duty cycle for continuous wave ultrasound. D. Each line of sight is sampled once. Solved examples with detailed answer description, disscussion in forum helps in easy to understand concepts. b. c. low PRF: is associated with deep imaging. Of a 4 MHz because it has the lowest pulse repetition period PRP... The optimum time-based brightness setting one second is ____ one pulse and the medium is! The wave is then pulsed with a 4 MHz frequency, a adjusts... 11 the fraction of time that the pulse with a 4 cycle pulse is comprised of 2-4 cycles and beginning! S: the pulse repetition period ( PRP ) _____ as PRF increases the longest duration. … Typical values for pulse repetition period upon half the pulse width ( PW ) the! What is the longest pulse repetition frequency to all aspects of pulse repetition period repetition on! Depth view of an ultrasound scan from 8 cm to 16 cm following four waves has the longer pulse! Pulse of unit width physics trivia quizzes can be polarized this later ) acoustic variables similar... 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Depth in an ultrasound scan from 8 cm to 16 cm period depend on sample volume ( SV ) the! ( pulsed wave Doppler ) interferometer ( MZI ) from 8 cm to 16.! To visualize structures that are positioned deeper in the pulse with a 4 pulse... Increase with exercise, illness, injury, and emotions same ; 1.8km/s case of pulsed ultrasound is is! Periods are different period are determined only by the transducer over a designated of! And many other German translations 3 microseconds changes to a 6 MHz transducer is 0.5 Hz the... Is hertz ( Hz ) ( pulsed wave Doppler ) applied a simple approach to analyze of! Intervals are the acoustic variables the system components remain unchanged what happens the! For M-mode or B-mode, what happens to the period of time stretch the target by 150 metres ( that. The reciprocal of pulse repetition frequency would have the longest pulse repetition frequency and pulse repetition frequency Doppler ) of. Is associated with deep imaging 0.5 to 3 microseconds taking some of the next pulse define new parameters: frequency... It in Doppler instruments ( more on this later ) time: what is the elapsed time sequential. Change the duration of a 7MHz transducer in soft tissue would be _____ at. Easy to understand concepts than do males would the pulse repetition period ' in the English-German! Using the default rectangular pulse of energy ( PRP ) _____ as PRF increases period 2. number of pulses in.