Free RVS (CCI) Practice Test

10 Free RVS (CCI) Practice Questions

1. In an ultrasonic wave traveling through soft tissue, the particles vibrate in the same direction as the wave's movement. What is the most accurate way to characterize this type of wave?

   1. Electromagnetic and Longitudinal
   2. Electromagnetic and Transverse
   3. Mechanical and Transverse
   4. Mechanical and Longitudinal
   Show Answer & Explanation

   Correct answer: Mechanical and Longitudinal

   The correct answer is Mechanical and Longitudinal. A mechanical wave is a wave that requires a medium to propagate, such as soft tissue. A longitudinal wave is a wave in which the particles of the medium vibrate parallel to the direction of the wave's propagation. An example of a longitudinal wave is sound. A transverse wave is a wave in which the particles of the medium vibrate perpendicular to the direction of the wave's propagation. An example of a transverse wave is light. An electromagnetic wave is a wave that does not require a medium to propagate, such as light or radio waves.

2. What is the main disadvantage of using persistence in sonographic imaging of rapidly moving structures?

   1. Relevant abnormalities may be concealed
   2. Increased noise in the image
   3. Reduced image quality
   4. Increased image distortion
   Show Answer & Explanation

   Correct answer: Relevant abnormalities may be concealed

   When using persistence with rapidly moving structures, relevant abnormalities can be concealed, and a low persistence must be selected.

3. What is the primary advantage of using autocorrelation in color flow Doppler imaging over Fast Fourier Transform (FFT)?

   1. Greater depth penetration
   2. Better visualization of blood flow
   3. Higher accuracy in velocity estimation
   4. Faster processing of Doppler shift information
   Show Answer & Explanation

   Correct answer: Faster processing of Doppler shift information

   Autocorrelation allows for faster processing of Doppler shift information in color flow Doppler imaging compared to Fast Fourier Transform (FFT).

4. What can cause two closely spaced reflectors to appear as one reflector in ultrasound imaging?

   1. Reverberation
   2. Resolution artifacts
   3. Acoustic speckle
   4. Refraction
   Show Answer & Explanation

   Correct answer: Resolution artifacts

   Resolution artifacts (axial, lateral) can cause two closely spaced reflectors to appear as one reflector in ultrasound imaging.

5. Which artifact is caused by the beam not being extremely thin, leading to unintended echoes appearing in the image?

   1. Reverberation
   2. Slice Thickness Artifact
   3. Multipath
   4. Mirror Image Artifact
   Show Answer & Explanation

   Correct answer: Slice Thickness Artifact

   Slice Thickness Artifact occurs when the ultrasound beam is not extremely thin, causing echoes from structures located above or below the intended imaging plane to be included in the image. This leads to unintended echoes appearing in the image, which can affect diagnostic accuracy.

6. What is the primary factor affecting lateral resolution in ultrasound imaging?

   1. Pulse repetition frequency
   2. Sector width
   3. Receive focus
   4. Beam width
   Show Answer & Explanation

   Correct answer: Beam width

   Lateral resolution is affected by beam width and transducer frequency, with narrower beams and higher frequency transducers providing optimal lateral resolution.

7. Which of the following best describes how much resistance an ultrasound beam encounters as it passes through the medium?

   1. Attenuation coefficient
   2. Speed of sound
   3. Acoustic impedance
   4. Reflection coefficient
   Show Answer & Explanation

   Correct answer: Acoustic impedance

   Acoustic impedance is the measure of the resistance that an acoustic wave encounters as it travels through a medium. It is a product of the density of the medium and the speed of sound within that medium.

8. The internal carotid artery exhibits plaque, a systolic velocity of <125 cm/s, a diastolic velocity of <40 cm/s, and an ICA and CCA ratio of <2.0 . Based on this information what is the percentage of diameter reduction?

   1. 0.1
   2. 50-69%
   3. 70-99%
   4. <50%
   Show Answer & Explanation

   Correct answer: <50%

   Results of Society of Radiologists in Ultrasound Consensus Conference on the Diagnosis of Internal Carotid Artery Stenosis ICA/CCA****** ICA PSV**Diameter***** PSV Ratio*****ICA EDV Normal******** <125****** None****** <2.0********** <40 <50% ********* <125****** <50%***** <2.0********** <40 50%-69%***** 125-230*** ≥50%***** 2.0-4.0******* 40-100 ≥70%-99%*** >230******* ≥50%***** >4.0********** >100 Near occlusion*** High, low, or undetectable*** Visible *** Variable Total occlusion*** Undetectable*** Visible, no detectable lumen*** N/A*** N/A Key Points • Many patients are asymptomatic. • Carotid bruit (caused by turbulent blood flow) • Amaurosis fugax caused by Hollenhorst plaque • Transient ischemic attack • Ischemic stroke • Carotid artery stenosis normally does not cause vertigo, lightheadedness, or syncope Risk factors: • Advanced age • Tobacco use • Arterial hypertension • Diabetes mellitus

9. The proximal superficial femoral artery has a high-grade stenosis with a peak systolic velocity of 500 cm/s. At what point does the flow become laminar distal to the stenosis, assuming there are no distal stenoses?

   1. 5cm
   2. 0.2cm
   3. 0.5cm
   4. 1cm
   Show Answer & Explanation

   Correct answer: 5cm

   You can expect to find post stenotic turbulence or flow disturbance within the first centimeter of flow beyond a stenosis.

10. A patient comes to the vascular lab for a carotid duplex, and in the notes, it states that they have a 50% diameter reduction. By how much would the area decrease?

    1. 99
    2. 75
    3. 50
    4. 44
    Show Answer & Explanation

    Correct answer: 75

    • An area reduction of 44 percent is equal to a diameter reduction of 25 percent. • An area reduction of 75 percent is equal to a diameter reduction of 50 percent. • An area reduction of 94 percent is equal to a diameter reduction of 75 percent. • An area reduction of 99 percent is equal to a diameter reduction of 90 percent. • A diameter reduction of 25 percent is equal to an area reduction of 44 percent. • A diameter reduction of 50 percent is equal to an area reduction of 75 percent. • A diameter reduction of 75 percent is equal to an area reduction of 94 percent. • A diameter reduction of 90 percent is equal to an area reduction of 99 percent.