Davies spi Physical principles
Which describes constructive interference A. Sound waves are in phase and resulting amplitude is increased B. Sound waves are in phase and resulting amplitude is decreased C. Sound waves are out of phase and resulting amplitude is increased D. Sound waves are out of phase and resulting amplitude is decreased E. None of the above
A: Sound waves are in phase and resulting amplitude is increased.
When your patient ask you how much longer the ultrasound test will take, his voice is in the audible frequency range which of the following frequencies is in the audible frequency range A. 100 MHz B. 10 kHz C. 10 Hz D. 10,000 MHz E. 100,000 Hz
B. 10 kHz
You are scanning a large mass that is a composed primarily of fat. Which of the following are you most likely to encounter? A. Posterior acoustic shadowing caused by increased attenuation through the fat B. Axial misregistration of objects distal to the mass on the screen due to the slower propagation speed through fat C Lateral misregistration of the mass on the screen because of refraction D. Total reflection of the sound being caused by a large acoustic impedance mismatch E. Difraction of the sound beam due to a virtual small aperture through the mass
B. Axial misregistration of objects distal to the mass on the screen due to the slower propagation speed through fat
While imaging a cyst, you know the shadowing posterior to each lateral border of the cyst. What is the source of the shadowing A. Redirection of the sound beam at the interface with different propagation speeds in a curved surface B. Bending of the sound you to different media propagation speeds C. Increased attenuation of the sound beam at the borders of the cyst D. Lateral misregistration of the cyst due to the multipath artifact E. Did fraction of the sound beam resulting in a weakening signal at the lateral borders of the cyst
B. Bending of the sound beam due to different media propagation speed
During the performance of a sonogram, you would be most likely to encounter refraction in this view: A. Specular reflector B. Curved interface C. Perpendicular incidence D. Rayleigh scatter E. Refraction is not in counter during an abdominal sonogram
B. Curved interface
What is the relationship of frequency to absorption? A. If frequencies hand, absorption is doubled B. If frequency is doubled, absorption is doubled C. If frequency is doubled, absorption is halved D. If frequencies halved, absorption is quartered E. The rate of sound absorption is not frequency dependent
B. If frequency is doubled, absorption is doubled
The algebraic summation of waves leading to patterns of Minnema in Maxima is called: A. Scattering B. Interference C.absorption D. Refraction E. Diffusion
B. Interference
When the sound beam is reflected during a sonographic examination, which of the following might you detect on an ultrasound image A. Axial misregistration B.Lateral misregistration C. Reverberation posterior to a reflector D. Enhancement of a reflector E. Electrical interference
B. Lateral misregistration
Which prefix equals 10^-3 A. Micro B. Milli C. Mega D. Centi E. None of the above
B. Milli
Which most correctly describes sound propagation in a medium? A. A sound propagation, A molecule travels from one into the medium to another B. Molecule oscillate back and forth to propagate sound waves but do not move from one into one medium to another C. A molecule does not very its position as sound travels D. Each molecule expands and contracts to propagate and sound way through a medium E. Sound waves Cannot Travel through a medium
B. Molecules oscillate back-and-forth to propagate sound waves but do not move from one into the mediums
During a sonographic examination of a large vessel, a 45° beam to vessel Ingle would be called A. Normal incidence B. Oblique incidents C. Perpendicular incidents D. Snells incidence E. None of the above
B. Oblique incidence
Bandwidth refers to: A. Number of cycles per pulse B. Range of frequencies in a pulse C. Rate of pulse repetition frequency D. Range of pulses in a frame E. Number of wave lengths in one second
B. Range of frequencies in a pulse
The speed of sound is defined as the: A. Speed of the vibrating particles in the median B. Speed at which the sound wave propagate through the medium C. Number of cycles per second of the vibrating particles D. Inverse of the frequency E. Speed of the electrical impulse applied to the piezoelectric element
B. Speed at which the sound propagate through the medium
What system control should you adjust to compensate for sound attenuation with increasing depth? A. Dynamic range B. TGC C. Transmit power D. Overall receiver gain E. Focus position
B. TGC
Snells law describes: A.The percentage of reflection at an interface with normal instance in different densities B. The angle of sound transmission at an interface between media having different propagation speeds C. The amount of attenuation of sound in tissue with depth D. The amount of back scattering from diffuse reflector E. The angle of sound reflection and then her face with a black incidents and non-specular reflection
B. The angle of sound transmission at an interface between media having different propagation speeds
You will not see refraction in the sonographic image if: A.The sound beam strikes an interface at an angle and greater than 45° B. The sound beam is perpendicular to the inner face C. The sound beam is 45° to the inner face D. The sound beam change is propagation speed at the interface E. The sound room strikes and interface at an angle of less than 45°
B. The sound beam is perpendicular to the interface
For pulse ultrasound, which of the following factors determine the frequency of a sound wave? A. Pulse repetition frequency(prf) B. Transmit frequency C. Area of the transducer elements D. Pressure applied to the E. All of the above
B. Transmit frequency
The rate of sound attenuation is lowest in: A. Air B. Water C. Liver D. Bone E. Lung
B. Water
Wavelength is measured in: A. Hertz B. Micro seconds C. Millimeters D. Rayls E. Newtons
C millimeters
The mass you are imaging has a diameter of 35MM. The value can also be expressed as: A. 350 cm B. 0.35 cm C. 3.5 cm D. 35 m E. 3.5
C. 3.5 cm
In order to display a structure on the sonographic image, the sound beam must be reflected at the interface. What is required for sound reflection at the interface of two structures A. Oblique incidents at the interface boundary B. Temperature differences between the two media C. A difference in the acoustic impedance of the media D. Different media diameter E. Different attenuation coefficient
C. A difference in the acoustic impedance of the media
When you switch a 2.5 MHz to a 5 MHz transducer, the wavelength: A. Doubles B. Quadruples C. Halves D. Quarters E. Is unaffected
C. Halves
When you change the transmit frequency, which of the following is altered? A. Displacement amplitude of the particles in the medium B. Speed at which the sound waves propagate through the medium C. Number of cycles per second D. Pulse is transmitted per second E. Number of an electrical impulses applied to the transducer per second
C. Number of cycles per second
What two conditions must be present to cause refraction of a sound wave? A. Perpendicular incidence and identical media propagation speeds B. Perpendicular incidence and reflector size smaller than one wavelength C. Oblique incidence in different media propagation speeds D. Oblique incidence and reflector size smaller than one wavelength E. Normal incidents and reflector size smaller than one wavelength
C. Oblique incidence and different media propagation speeds
While performing a sonogram, you encounter the following interfaces. Which will produce the weakest reflected signal? A. Organ parenchyma/fluid B. Organ parenchyma/air C. Organ parenchyma/Organ parenchyma D. Organ parenchyma/bone E. Organ parenchyma/ ligament
C. Organ parenchyma/Organ parenchyma
The regions of low pressure and density that are formed during sound propagation are termed: A.Compressions B. Shear waves C. Rare factions D. Cavitation E. Bulk modulus
C. Rare factions
What sound tissue interaction is necessary to form an ultrasound image? A. Rarefaction B. Refraction C. Reflection D. Diffraction E. Interference
C. Reflection
You are imaging a structure that is highly attenuating. Which imaging effect do you expect to encounter? A. Enhancement B. Increasing penetration C. Shadowing D. Refraction E.Increase acoustic speckle
C. Shadowing
When you image sound reflected from a large, smooth interface, you are observing results of: A. Raleigh scattering B. Diffraction C. Specular reflection D. Diffusion E. Refraction
C. Specular reflection
And echo from which one of the following sound reflectors as most dependent on the angle of incidence A. Rayleigh scattered B. Diffuse reflector C. Specular reflector D. Acoustic scatterer E. Non-specular reflector
C. Specular reflector
As a general observation about media in diagnostic sonography, sound propagates faster in materials with greater: A. Compressibility B. Acoustic impedance C. Stiffness D. Refracted index E. All of the above
C. Stiffness
When you adjust the pulse repetition frequency, you are changing: A. The number of pulse is Per line B. Number of pulses per frame C. Number of pulse is per second D. The number of wavelengths per second E. The number of wavelength per pulse
C. The number of pulses per second
What is the purpose of the gel coupling between the transducer and the skin A. To reduce hitting of the epidermis caused by the sound absorption and friction B. To soften the skin and soothe the patient C. To provide a medium for sound transmission since ultrasound doesnt propagate through air D. To reduce the impedance difference between the transducer in the skin E. To lessen refraction of the sound is the skin surface and improves sound transmission
C. To provide a medium for sound transmission since ultrasound ultrasound does not propagate through air
If the number of cycles in a pulse is increase for the wavelength remains the same, which of the following is true A. The frequency is increased B. The propagation speed is increased C. The pulse duration is increased D. The period is Decreased E. The bulk modulus is decreased
C.The pulse duration has increased
Do you have decreased acoustic power by -3 dB. Which of the following most accurately describes this adjustment A. The intensity has been Quadrupled B. The intensity has been quartered C. The intensity has been increased 10 times D.Intensity has been halved E. The intensity has been altered
D. The intensity has been halved
According to snells law, the angle of transmission is related to the incident beam angle and: A. The amount of acoustic impedance mismatch at an interface B. The change in frequency that occurs at an interface C. one half the angle of incidence D. The relative speed of sound in the two media E. The percentage of diffraction distal to the interface
D. The relative speed of sound in the two media
When you are educating your patient about the sonographic exam, sound travels through air from your mouth to your patients ears which of the following is true regarding the speed of sound traveling through air A. The speed of sound and air is greater than the speed of light B.The speed of sound an air is greater than the speed of sound and soft tissue C. The speed of sound in air is not predictable D. The speed of sound and air is slower than the speed of sound and soft tissue E. The speed of sound in air is equal to the speed of sound
D. The speed of sound in air is slower than the speed of sound in soft tissue
Which of the following represents the number 1234 in scientific notation? A. 0.1234 B. 0.1234 x10^3 C. 1234 x10^1 D. 1234 x 10^-1 E. 1.234 x 10^3
E. 1.234 x 10^3
Attenuation of the sound beam is affected by: A. Absorption B. Scattering C. Reflection D. Propagation speed E. A,B and C
E. A, b, and c
Continuation of the sound increases increases with increasing: A. path length B. Absorption C. Frequency D. Scattering in reflection E.All of the above
E. All of the above
Which of the following increases as frequency increases A. Absorption B. Scattering C. Attenuation D. A and C only E. All of the above
E. All of the above
You are imaging a rounded mass with irregular borders. The mass has a much slower propagation's band and surrounding tissue. What sound tissue interaction will be encountered as the ultrasound propagates through the interface A.Refraction B. Reflection C.Absorption D. Scattering E. All of the above
E. All of the above
You have increased the transmit power while performing a pelvic ultrasound examination. This action increases which of the following? A. Penetration B. Acoustic power C. Image brightness D. Voltage applied to the transducers element E. All of the above
E. All of the above
What term is used to describe the reduction in the intensity of sound as it propagate through tissue? A. Diffraction B. Refraction C. Reflection D. Absorption E. Attenuation
E. Attenuation
You may observe sound attenuation by all of the following except: A. Reflection B. Scattering C. Conversion of sound to heat D. Absorption E.Compression
E. Compression
What would you change of the image does not show adequate penetration in the far Field displaying noise instead of tissue? A. Turn on compound imaging B. Move the focal position to a more superficial location C. Use an acoustic standoff pad D.Increase TGC E.Decrease transmit frequency
E. Decrease transmit frequency
Which of the following would increase the spatial pulse length ? A. Increase PRF B. Decrease number of transmit pulses per frame C. Increase number of transmit pulses per second D. Increase number of transmit pulses per line E. Increase number of cycles per pulse
E. Increase number of cycles per pulse
What determines the speed of sound? A. Frequency of sound wave B. Intensity of sound wave C. Attenuation of sound wave D. Reflection of sound wave E. Medium through which sound passes
E. Medium through which sound wave passes
You are imaging with a 5 MHz linear array transducer. What sound parameter stays constant as the beam propagate through the tissue A. Frequency B. Intensity C. Amplitude D. Wavelength E. None of the above
E. None of the above
The time that it takes for one pulse to occur is known as me: A. Duty factor B. Spatial pulse length C. Wavelength D. Pulse repetition frequency E. Pulse duration
E. Pulse duration
What interaction of ultrasound and tissue is primarily responsible for imaging the internal structure of organs? A. Specular reflection B. Refraction C. Diffraction D. Destructive interference E. Scattering
E. Scattering
Which of the following statements regarding the effects of frequency on Rayleigh scattering is true? A. The amount of scattering is not affected by frequency B. Scattering intensity doubles and frequency is doubled C. Doubling the frequency results and halving the scattering intensity D. Doubling the frequency results in quartering the scattering intensity E. Scattering intensity is proportional to frequency raised in the fourth power
E. Scattering intensity is proportional to frequency rays to the fourth power
Which of the following describes sound propagation through a vacuum? A.Sound travels as transverse wave through run B. When sound travels through a vacuum, the propagation speed increases 3, 300, 000M/S C.Sound travels at the speed of light in the D.Sam propagation is random and a vacuum E. Sound cannot travel through a vacuum
E. Sound cannot travel through vacuum
Both modulus is closely related to which of the following quantities. A. Attenuation B. Frequency C. Wavelength D. Volume E. Stiffness
E. Stiffness
Diagnostic ultrasound is limited and it's diagnostic application to the adult brain because? A. The speed of sound in brain is much faster than soft tissue resulting in a range artifact affect B. Nearly all the sound is transmitted at the interface between bone and soft tissue with no reflection to create an image C. The fraction of the sound in occurs because of the irregular service of the brain resulting in little transmission of sound through the cranial interval D. Bending of the sound being due to refraction results in a multipath artifact that distorts the image, making in non-diagnostic at a high frequency E. The great acoustic impedance mismatch between the cranium and soft tissue causes most of the sound to be reflected at the inter-face
E. The great acoustic impedance mismatch between the cranium and soft tissue causes most of the sound to be reflected at that interface
What determines acoustic impedance A. Frequency and propagation speed B. Frequency and interface size C. Density and propagation speed of the medium D. Angle of incidence and median propagation speed E.Frequency and media density
D. Angle of incidence and media propagation speed
During production of a sonogram, you image the following structures. Which is the most attenuating? A. Blood B. Bile C. Soft tissue D. Calcification E. Muscle
D. Calcification
For soft tissue, one of the factors responsible for determining acoustic impedance A. Attenuation B. Frequency C. Absorption D. Density E. Amplitude
D. Density
Wavelength depends on two factors? A. Frequency and amplitude B. Amplitude and propagation speed C. Period and frequency D. Frequency in propagation speed E. Amplitude and intensity
D. Frequency and propagation speed
Which of the following is most likely also to decrease beam intensity ? A. Increasing acoustic output B. Decreasing receiver game C. Increasing focusing D. Increasing beam area E. Increasing amplitude
D. Increasing beam area
What sound parameter is determined only by the medium? A: Frequency B: Period C: Intensity D: Propagation speed E: None of the above
D. Propagation speed
What time refers to regions and decrease particle density in a sound beam? A. attenuation B. Transmission C. Compression D. Rareaffection E. Reverberation
D. Rare faction
If soundwave of 3 MHz, 5 MHz, and 10 MHz are transmitted through the same section of anatomy, reflection from which frequency would reach the transducer first A. 3 MHz B. 5 MHz C. 10 MHz D. Reflections from all three frequencies would have nearly identical transit times E. It is not possible to protect which one would be first
D. Reflections from all the frequencies would have nearly identical transit times
Another term for non-specular reflection is: A.Destructive interference B. Refraction C. Diffraction D. Scattering E. Absorption
D. Scattering
When you perform a Doppler exam, the frequency of the transmitted signal is determined by: A. Backing material B. Attenuation factor of the tissue C. Bandwidth D. The frequency of the electrical signal applied to the transducer E. Amplitude
D. The frequency of the electrical signal applied to the transducer
Interference patterns of reflected waves causes: A. Acoustic speckle B. Acoustic enhancement C. Rarefaction D. Volume averaging E. All of the above
A. Acoustic speckle
An interaction of echoes that leads to reinforcement rather than two partial or total cancellation is known as: A. Constructive interference B. Refraction C. Destructive interference D. Autocorrelation E. Rarefaction
A. Constructive interference
As you perform a sonogram, you switch from a 3.5 MHz transducer to a 7.0 MHz transducer to image a superficial structure. Compared to the 3.5 MHz transducer, what will the 7.0 MHz attenuation rate and wavelength be? A. Double the attenuation rate, one- half the wavelength B. Double the attenuation right, double the wavelength C. One fourth the attenuation rate, one half the wavelength D. One half The attenuation rate, double the wavelength E. one- half The attenuation rate,one fourth The wavelength
A. Double the attenuation rate, one half The wavelength
10-3 equals: A. 1000 B. 1/1000 C. 1/10,000 D. 10
B. 1/1000
The intensity transmission coefficient at the interface between two structures equals 1/100. What is the intensity reflection coefficient A. 0/100 B. 99/100 C. 1/100 D. 100/100 E. 49/100
B. 99/100
The unit of impedance is the: A. Joule B. Rayl C. Watts/cm^2 D. Newton E. Watts/cm
B. Rayl
One MHz equals? A. 10^3 hz B. 10^-3 hz C. 10^6 hz D. 10^-6 hz E. 10^9 hz
C. 10^6 hz
Which of the following frequencies is considered to be ultrasound? A.2000 Hz B. 20 Hz C. 2 MHz D. 200 Hz E. 2 Hz
C. 2 MHz
Ultrasound propagation velocity depends on: A. Amplitude and frequency B. Impedance and attenuation C.Density and compressibility D. Dynamic range in compression E. Impedance and density
C. Density and compressibility
Which phenomenon is associated with a pattern produced by a sound beam after passing through a small aperture A. Scattering B. Absorption C. Diffraction D. Interference E. Diffuse reflection
C. Diffraction
Power divided by the beam and is equal to the: A. Probe angle B. Speed of sound C. Intensity D. Attenuation E. Amplitude
C. Intensity
Which of the following is an example of really scattered? A. Renal capsule B. Arterial wall C. Red blood cell D. Bowel gas E. Femur
C. Red blood cell
What can you do to enhance the visibility of a specular reflector? A. Scan with the lowest possible frequency B. Scan with oblique incidence C. Scan with Perpendicular incidence D. Increase the distance to the reflector E. Scan with an incident angle at 45°
C. Scan with perpendicular incidence
Relative measurement based on a logarithmic scale is expressed in: A. Newtons per centimeter squared B. Watts per centimeter squared C. dB D. Pa C. Neper
C. dB
Terms used to describe the strength of the sound beam include: A. Amplitude and impedance B. Amplitude and wavelength C. Amplitude and intensity D. Intensity and impedance E. Frequency and impedance
C: Amplitude and intensity
Axial resolution is determined chiefly by ? A. Beam width B. Transducer diameter C. Pulse duration D. Attenuation coefficient E. Intensity
C: Pulse duration
During a diagnostic ultrasound examination, you encounter all of the interactions of ultrasound and tissue listed below. Which one will not cause a redirection of part of the ultrasound energy? A. Reflection B. Scattering C. Divergence D. Absorption E. Refraction
D) absorption
The transfer of the acoustic energy into heat is termed: A. Scattering B. Diffusion C. Diffraction D. Absorption E. Refraction
D) absorption
While performing a Doppler ultrasound examination, you adjust pulse repetition frequency to 12 kHz this can also be expressed as: A. 0.12 B. 1200 hz C. 1.2 MHz D. 12,000 hz E. 120 MHz
D. 12,000 hz
The sound propagation speed used to calibrate range measuring circuits on diagnostic sonography instruments is A. 1.54 m/s B. 1560 mm/s C. 1.46 mm/us D. 1540 m/s E. 146, 000 cm/s
D. 1540 m/s
What is the velocity of an ultrasound wave in bones A. 333 m/s B. 8050 m/s C. 1540 m/s D. 4080 m/s E. 1240 m/s
D. 4080 m/s
Doppler pulse is use for diagnostic purposes are typically ________ cycles long : A. 0 - 2 B. 2-3 C. 4-5 D. 5-30 E. greater than 100
D. 5-30
Acoustic impedance increases with which of the follow? A. Increased tissue density B. Increased propagation speed C. Increased transducer frequency D. A and b E. All of the above
D. A and B
Which of the following human tissues have the highest rate of attenuation of an ultrasound wave? A. Liver B. Fat C fluid D. Lung E blood vessel
D. Lung
A longitudinal wave is characterized by: A. Away that demonstrates only sagittal imaging planes B. Randomized particle motion C. Constant acoustic velocity of 1540 m/s D. Particle motion occurring in the same direction as propagation E. Particle motion occurring perpendicular to the direction of propagation
D. Particle motion occurring in the same direction as propagate
Which of the following terms didn't notice the time it takes for one cycle to occur A. Frequency B. Amplitude C. Wavelength D. Period E. Pressure
D. Period
What occurs when you image a structure with oblique incidence? A. A very strong reflection will occur since this is the optimal angle for imaging B. All of the sound will be reflected due to the poor scanning angle C. All of the sound will be transmitted due to the poor scanning angle D. The angle of reflection will be oriented away from the transducer resulting in decreased visualization of the structure E. The amount of scattering will be reduce with a scanning angle of 45° resulting in a cleaner image with reduce artifact
D. The angle of reflection will be oriented away from the transducer resulting in decreased visualization of the structure
Which of the following factors does not affect impedance A. Stiffness B. Density C. Propagation speed D. Frequency E all of the above affect impedance
D. frequency
Acoustic impedance: A. Is independent of the speed of sound B. Is inversely proportional to the density C. Is greater in gas than a metal D. Equals density times propagation speed E. Is independent of the density
D: Equals density times the propagation speed
Which of the following interactions of the sound tissue decreases the intensity of the transmit beam? A. Absorption B. Reflection C. Scattering D. Conversion of sound to heat E. All of the above
E. All of the above
Which sound beam frequency would exhibit the greatest intensity loss with increasing depth A. 10 MHz B. 8 MHz C. 5 MHz D. 3 MHz E. 2 MHz
A. 10 MHz
You are performing a sonographic exam on a large patient. Which transducer would provide the least amount of signal attenuation A. 2.5 MHz B. 3.5 MHz C. 5 MHz D. 7.5 MHz E. 10 MHz
A. 2.5 MHz
You are imaging a structure containing to media having the same acoustic impedance. What will occur at the boundary of the two structures A.All of the sun will be transmitted B. All of the sound will be reflected C. Some of the sound will be reflected D. Some of the sound will be reflected in some of the sound will be transmitted E. Most of the sand will be absorbed at the media boundary
A. All of the sound will be transmitted
The maximum cyclical change in a quantity is known as: A. Amplitude B. Pressure C. Power D. Intensity E. DB
A. Amplitude
In soundwave propagation, a region of elevated pressure is termed: A. Compression B. Demodulation C. Rarefaction D: period E. Resonance
A. Compression
When you image is structure that is a specular reflector, the strength of the receive signal depends on the following two factors A. Difference in acoustic impedance an angle of incidence B. Difference in acoustic velocity and interface size C. Difference in acoustic velocity and motion of reflector D. Angle of incidence and tissue temperature E. Both modulus and interface size
A. Difference in acoustic impedance an angle of incidence
When sound strikes specular reflector and an oblique angle, the angle of reflection is: A. Equal to the angle of incidence B. Greater than the angle of incidence C. Less than the angle of incidence D. Twice that of the angle of incidence E. The cosine of the angle of incidence
A. Equal to the angle of incidence
The propagation speed for sound is lowest in which of the following biological tissues A. Fat B. Blood C. Muscle D. Bone E. Liver
A. Fat
Choose two benefits of tissue harmonic imaging: A. Grading lobe artifact are reduced and lateral resolution is improved B. Axial and lateral resolution are improved C. Contrast and axial resolution are improved D. Penetration is improved and axial resolution is improved E. Penetration is improved and contrast resolution is improved
A. Grading lobe artifacts are reduced and lateral resolution is improved
With absorption, acoustic energy is converted to: A. Heat B. Microbubbles C. Kinetic energy D. Decibels E. Potential energy
A. Heat
Which of the following properties would result in increasing propagation speed of sound through a medium A. Increasing stiffness B. Increasing density C. Increasing frequency D. Increasing distance E. Increasing amplitude
A. Increasing stiffness
Which of the following best characterizes an ultrasound wave and human tissue? A.Mechanical longitudinal wave B. Radioactive waves C. Transverse refraction a wave D. Electromagnetic wave E. Electronica Piezoelectric wave
A. Mechanical longitudinal wave
An example of spectacular reflector is: A. Pericardium B. Liver parenchyma C. Red blood cells D. Ascites E. Hematoma
A. Pericardium
You notice that the image in the far field is less bright compared to the Nearfield this is due to: A. Sound attenuation B. Propagation in speed variation C. Refraction D. Diffraction E. Doppler effect
A. Sound attenuation
What system control can you adjust to compensate for an effect of sound attenuation in the body. A. TGC B. Dynamic range C. Frame average D. Depth E. Line density
A. TGC
The transducer you are using transmits wide bandwidth pulses who's frequency content is 2 to 5 MHz. Which of the following most correctly describes the reflected Echo signals after they have trans first A. The echo signals will be shifted down in frequency due to the increased attenuation of higher frequencies B. The echo signals will be of reduced intensity but will have the same frequency content as the transmitted beam C. The echo signals will be shifted upward in frequency due to the increase absorption of the lower frequencies D. Only the center frequency component of the bandwidth will be reflected back to the transducer E. The echo signals frequency content will be identical to that of the transmitted mean
A. The echo signals will be shifted down in frequency due to the increase attenuation of higher frequencies
Which of the following describes if use reflection? A. The reflected beam is scattered in various directions B. The reflected frequency is altered by the Doppler effect C. The reflective beam is amplified by the focusing effect of scatters D. The reflected beam is weekend by the large acoustic impedance mismatch as a tissue interface E. There is no reflection at a tissue in her face because of a Disorganize transmit been
A. They were reflected beam is scattered in various direct
