SPI Flashcards. Read the Question then click “show answer” to see the answer.

SPI Flashcards - True and False

Question 1
The appearance of negative velocities in a pulsed Doppler display always indicates that red blood cells are moving away from the transducer.
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Question 1 Explanation: 
False aliasing may occur
Question 2
Mean frequency corresponds to the fastest moving RBCs within the sample volume at the time of measurement.
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Question 2 Explanation: 
False
Question 3
The pulse-echo system should have a high Q factor.
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Question 3 Explanation: 
False. Q factor = length of time sound persists. Optimal low Q factor = short pulse length. Transducers with high bandwidth and low Q factor are desirable.
Question 4
Color flow imaging is unique because it does not have a major problem with high frequency aliasing.
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Question 4 Explanation: 
False Color flow imaging is a PW Doppler technique which is also eubject to aliasing
Question 5
Refraction depends on the difference in acoustic impedances of the media forming the interface.
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Question 5 Explanation: 
False depends on the propagation speed differences in the medium and oblique angle of incident
Question 6
The synchronous signal processing in angiodynorgraphy uses a Doppler carrier frequency that is the same as the imaging center operating frequency.
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Question 6 Explanation: 
True
Question 7
The period of the wave is inversely proportional to the wavelength.
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Question 7 Explanation: 
False reciprocal
Question 8
One reson 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.
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Question 8 Explanation: 
True
Question 9
Receiver-angle values in CW Doppler analysis do not influence the final Doppler shift
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Question 9 Explanation: 
False directly related to cosine of the angle
Question 10
Mean frequency is calculated from weighted sum of frequencies in the power spectrum.
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Question 10 Explanation: 
True
Question 11
Smaller transducers always produce smaller beam diameters.
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Question 11 Explanation: 
False depends on focusing, whether near field or far field
Question 12
The pulsed-echo system, the Q factor should be made as large as possible
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Question 12 Explanation: 
False Length of time that the sound persist Low Q = low SPL= good LARD
Question 13
A videotape recorder records at a rate of 30 frames/s and therefore cannot be used to record images from a mechanical scanner operating at lower frame rates.
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Question 13 Explanation: 
False
Question 14
Refraction always occurs at the interface between two media when the propagation speeds of the media are unequal?
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Question 14 Explanation: 
False - 1. oblique incidence 2. unequal propagation speed
Question 15
Asynchronous signal processing in color flow imaging requires the same frequency for both Doppler and gray-scale imaging.
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Question 15 Explanation: 
False
Question 16
Interface is the surface forming the boundary between two media having different acoustic impedances.
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Question 16 Explanation: 
True
Question 17
Color Doppler systems are not subject to aliasing.
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Question 17 Explanation: 
False
Question 18
Typically, the sonographer can adjust the compression function of a receiver.
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Question 18 Explanation: 
True
Question 19
The shorter the pulse length the better the picture quality.
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Question 19 Explanation: 
True
Question 20
The sonographer can make an image of uniform brightness by adjusting both output power and receiver gain.
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Question 20 Explanation: 
False - This is the function of the Time Gain Compensation (TGC)
Question 21
The pulsed- Doppler system yields better depth resolution than the continuous wave system.
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Question 21 Explanation: 
True
Question 22
Linear phased array scanners need no form of mecahnical focusing since focusing is performed in electronically.
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Question 22 Explanation: 
False - slice thickness requires mechanical focusing
Question 23
Sampling intervals for cardiac color flow imaging and vascular color flow imaging are similar.
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Question 23 Explanation: 
False
Question 24
It is not possible to steer an annular phased array electronically.
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Question 24 Explanation: 
True
Question 25
The Doppler angle is not considered in the calculation of velocity in color Doppler imaging
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Question 25 Explanation: 
False
Question 26
Cardiac color flow imaging also works well in the vascular system because the design can handle the high attenuation rates in cardiac imaging.
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Question 26 Explanation: 
False
Question 27
The frame rate of real-time scanners depends on the number of lines used to form one image
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Question 27 Explanation: 
True
Question 28
Focused ultrasound are considered less likely to create bioeffects because they will strike fewer gas bubbles that could potentially cavitate.
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Question 28 Explanation: 
True
Question 29
Power spectrum displays a plot of magnitude of individual frequency components versus frequency that converts the complex Doppler signal from time domain into the frequency domain.
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Question 29 Explanation: 
True
Question 30
Red cell stasis is an in vivo phenomenon characterized by erythrocytes within small vessels stopping the flow and collecting in the low pressure regions of the standing wave field.
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Question 30 Explanation: 
True
Question 31
Levels of output power and intensity for color flow imaging are generally higher than those for gray-scale imaging.
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Question 31 Explanation: 
True
Question 32
If the thickness of two materials forming the interface is increased,the percentage of the reflected US wave becomes greater.
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Question 32 Explanation: 
False Reflection, normal incidence and Z (acoustic impedance)
Question 33
Viscoelasticity is the property of a medium characterized by energy distortion in the medium and irreversibly converted to heat.
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Question 33 Explanation: 
True
Question 34
Changes in the pre processing controls will not affect the numbers stored in the scan converter.
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Question 34 Explanation: 
False
Question 35
Non specular reflectors have physical dimension that are greater than the wavelength.
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Question 35 Explanation: 
False They are smaller
Question 36
Because Doppler signal processing requires more energy, synchronous signal processing always produces Doppler power levels that are higher than those for gray scale imaging.
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Question 36 Explanation: 
False - synchronous = common transmitter
Question 37
Filtering widens bandwidth.
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Question 37 Explanation: 
False
Question 38
To transfer sound through a medium, the affected molecules move from one end of the medium to the other.
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Question 38 Explanation: 
False microns only
Question 39
The color coding of red arteries and blue veins and slow high-resolution frame rates make the identity of arteries and veins in the abdomen direct and easy
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Question 39 Explanation: 
False abdomen= broad FOV pulse check
Question 40
The beam diameter is constant in the near zone
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Question 40 Explanation: 
False (waist)
Question 41
Linear phased array scanners need no form of mechanical focusing since focusing is performed electronically
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Question 41 Explanation: 
False
Question 42
Quality assurance evaluations of ultrasound systems should be performed weekly.
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Question 42 Explanation: 
False - routinely
Question 43
Side lobe, grating lobe and refraction artifacts all reduce lateral resolution.
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Question 43 Explanation: 
True
Question 44
Smaller transducers always produce smaller beam diameter
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Question 44 Explanation: 
False beam diameter depends on whether the beam is focused, distance from the transducer, Near field or far field
Question 45
Transit time broadening is a limitation of the FFT processing.
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Question 45 Explanation: 
True
Question 46
Quality assurance measurements are not required with electronic scanners with digital scan converters
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Question 46 Explanation: 
False
Question 47
Videotape recorders operating at 30 frames per second cannot be used with mechanical real-time units because the frame rate is too slow
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Question 47 Explanation: 
False - depends on imaging rate
Question 48
No refraction can occur at an interface if the media impedances are equal
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Question 48 Explanation: 
False Refraction= prop speed in medium Reflection and transmission= Z
Question 49
The near zone length should be kept as short as possible
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Question 49 Explanation: 
False
Question 50
The period of an ultrasound wave is related to the frequency and is the same regardless whether the wave is pulse or continuous.
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Question 50 Explanation: 
True
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I am the founder and lead Instructor here at ExamRefresh.com. I strive to help those that are entering the field of Ultrasound to be the best that they can be. Ultrasound is my passion.

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Comments

  1. sarla shah says:

    find them difficult at the moment

  2. sarla shah says:

    i need study more

  3. Hello I am preparing for my spi exam i need study material how can i get that. plz

  4. Hello everyone. Iam taking my spi exam last week of August2012. iam asking on this website spi 10 question spi20 question and spi 100 question ,than 50 flashcards that all is it enough to preapre for spi exam.plz Iam confused. if any one have more material for spi exam contact me plz my email. ayyanahmad@yahoo.com

    • We do have hundreds of spi practice questions but I think that we are here to supplement your learning. What I want is to help in those areas you don’t feel very strong in. I am going to be filming some ultrasound physics videos. Which areas do you need work in? What do you think you need the most help with? Let me know and maybe I can help.

  5. Sharedamc says:

    The flash cards review is very helpful, short, and straight to the point. Thanks, for the helpful material.

  6. My true or false screen only has the show answer box.. what happened to the list of choices?

  7. Ashley Romano says:

    Hi, im taking my exam next week I have been studing for the past 3 motnh for it. I have been using the davies question, your website and the edelman book. I feel like I know eveything I should but when I take the practice exam through ardms I dont do as well as I think. Your site says you give us all the infonwe should need. Iv been taking your ptactice exams and been getting really good scores how many people when usimg your site pass the exam? Do you havw any other tips for studying thanks

    • I like to think the practice questions are good for judging how ready you are. But they aren’t perfect because nobody can have the exact exam questions. Our pass rate is above 95%.
      You can only prepare so much. When you take the exam be confident and don’t second guess yourself. Answer the questions you know and skip the ones you don’t.
      Don’t get too bogged down in the math. It’s all about relationships.
      Good luck.

  8. Sarai Calvin says:

    I’m currently preparing to take my exam 04-20-2014 @ 6PM, I’m not quite ready, I’ve considered pushing the test back one more week, now that I’ve found your website. I’ve prepared with Edleman, I’m not quite through the entire book yet, however; I’m preparing as thoroughly as possible. I need help with reflection, refraction, transmission. Can you assist me?

  9. TARA CALDERON says:

    Hi….I was Wondering which is the best package to purchase for SPI only being that I am a vascular technician and will eventually take the RVT. I noticed you don’t have any packages that include both physics and vascular. Greatly appreciate your suggestions.

    • I will add the RVT materials in the future. I am focusing mostly on Abdomen, OBGYN and SPI because I have the most requests for those. The best way to study the physics portion is with the study guide. It has video explanations for all the concepts. Then use the practice tests at the end to check your progress.

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