ARDMS SPI
One reason why focused beams with low intensities are less likely to cause bioeffects is that a focused
beam is less efficient in heating a large mass of tissue to a critical temperature. correct answerTrue
Typically, the sonographer can adjust the compression function of a receiver. correct answerTrue
Mean frequency is calculated from weighted sum of frequencies in the power spectrum. correct
answerTrue
Refraction always occurs at the interface between two media when the propagation speeds of the
media are unequal? correct answerFalse - 1. oblique incidence 2. unequal propagation speed
The shorter the pulse length the better the picture quality. correct answerTrue
The synchronous signal processing in angiodynorgraphy uses a Doppler carrier frequency that is the
same as the imaging center operating frequency. correct answerTrue
The period of the wave is inversely proportional to the wavelength. correct answerFalse - Reciprocal
Changes in the pre processing controls will not affect the numbers stored in the scan converter. correct
answerFalse
Videotape recorders operating at 30 frames per second cannot be used with mechanical real-time units
because the frame rate is too slow correct answerFalse - depends on imaging rate
The pulsed- Doppler system yields better depth resolution than the continuous wave system. correct
answerTrue
, Cardiac color flow imaging also works well in the vascular system because the design can handle the
high attenuation rates in cardiac imaging. correct answerFalse
The sonographer can make an image of uniform brightness by adjusting both output power and receiver
gain. correct answerFalse - This is the function of the Time Gain Compensation (TGC)
No refraction can occur at an interface if the media impedances are equal correct answerFalse -
Refraction= prop speed in medium Reflection and transmission=Z
The frame rate of real-time scanners depends on the number of lines used to form one image correct
answerTrue
Mean frequency corresponds to the fastest moving RBCs within the sample volume at the time of
measurement. correct answerFalse
Levels of output power and intensity for color flow imaging are generally higher than those for gray-
scale imaging. correct answerTrue
Linear phased array scanners need no form of mechanical focusing since focusing is performed in
electronically. correct answerFalse - slice thickness requires mechanical focusing
Filtering widens bandwidth. correct answerFalse
Quality assurance evaluations of ultrasound systems should be performed weekly. correct answerFalse -
routinely
The near zone length should be kept as short as possible correct answerFalse
Transit time broadening is a limitation of the FFT processing. correct answerTrue
Color Doppler systems are not subject to aliasing. correct answerFalse
One reason why focused beams with low intensities are less likely to cause bioeffects is that a focused
beam is less efficient in heating a large mass of tissue to a critical temperature. correct answerTrue
Typically, the sonographer can adjust the compression function of a receiver. correct answerTrue
Mean frequency is calculated from weighted sum of frequencies in the power spectrum. correct
answerTrue
Refraction always occurs at the interface between two media when the propagation speeds of the
media are unequal? correct answerFalse - 1. oblique incidence 2. unequal propagation speed
The shorter the pulse length the better the picture quality. correct answerTrue
The synchronous signal processing in angiodynorgraphy uses a Doppler carrier frequency that is the
same as the imaging center operating frequency. correct answerTrue
The period of the wave is inversely proportional to the wavelength. correct answerFalse - Reciprocal
Changes in the pre processing controls will not affect the numbers stored in the scan converter. correct
answerFalse
Videotape recorders operating at 30 frames per second cannot be used with mechanical real-time units
because the frame rate is too slow correct answerFalse - depends on imaging rate
The pulsed- Doppler system yields better depth resolution than the continuous wave system. correct
answerTrue
, Cardiac color flow imaging also works well in the vascular system because the design can handle the
high attenuation rates in cardiac imaging. correct answerFalse
The sonographer can make an image of uniform brightness by adjusting both output power and receiver
gain. correct answerFalse - This is the function of the Time Gain Compensation (TGC)
No refraction can occur at an interface if the media impedances are equal correct answerFalse -
Refraction= prop speed in medium Reflection and transmission=Z
The frame rate of real-time scanners depends on the number of lines used to form one image correct
answerTrue
Mean frequency corresponds to the fastest moving RBCs within the sample volume at the time of
measurement. correct answerFalse
Levels of output power and intensity for color flow imaging are generally higher than those for gray-
scale imaging. correct answerTrue
Linear phased array scanners need no form of mechanical focusing since focusing is performed in
electronically. correct answerFalse - slice thickness requires mechanical focusing
Filtering widens bandwidth. correct answerFalse
Quality assurance evaluations of ultrasound systems should be performed weekly. correct answerFalse -
routinely
The near zone length should be kept as short as possible correct answerFalse
Transit time broadening is a limitation of the FFT processing. correct answerTrue
Color Doppler systems are not subject to aliasing. correct answerFalse
