Use Real SPI Dumps - ARDMS Correct Answers updated on 2026
ARDMS SPI SPI Exam Practice Dumps
ARDMS SPI Exam Syllabus Topics:
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NEW QUESTION # 112
What is an advantage of using pulsed wave Doppler as compared to using continuous wave Doppler?
- A. Higher echo sensitivity
- B. Decreased display of aliasing
- C. Improved temporal resolution
- D. Ability to select sample depth
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The key advantage of pulsed wave Doppler is range resolution, meaning the operator can select a specific depth (sample volume) for measuring velocities. Continuous wave Doppler does not provide this capability, as it samples velocities along the entire beam path.
According to sonography instrumentation reference:
"Pulsed wave Doppler allows selection of sample volume depth, providing range resolution which continuous wave Doppler lacks." Therefore, the correct answer is B: Ability to select sample depth.
NEW QUESTION # 113
Which resolution capability is most affected by spatial pulse length?
- A. Lateral
- B. Temporal
- C. Elevational
- D. Axial
Answer: D
Explanation:
Axial resolution refers to the ability to distinguish two structures that are close to each other along the path of the ultrasound beam.
Spatial pulse length (SPL) is the distance over which one pulse occurs, and it directly affects axial resolution.
Shorter SPL improves axial resolution because it allows better differentiation of closely spaced structures.
The axial resolution is improved by increasing the frequency of the transducer, which shortens the wavelength and hence the SPL. Reference:
ARDMS Sonography Principles and Instrumentation guidelines on resolution parameters and their impact on image quality.
NEW QUESTION # 114
If the pulse repetition frequency is 3 kHz, what is the maximum Doppler shift that can be detected without aliasing?
- A. 6.0 kHz
- B. 3.0 kHz
- C. 1.5 kHz
- D. 9.0 kHz
Answer: C
Explanation:
The maximum Doppler shift that can be detected without aliasing is determined by the Nyquist limit, which is half of the pulse repetition frequency (PRF). If the PRF is 3 kHz, the Nyquist limit is 32=1.523kHzz=1.5kHz. Therefore, the maximum Doppler shift that can be detected without aliasing is 1.5 kHz. Aliasing occurs when the Doppler shift exceeds this limit, causing an incorrect representation of the velocity.
Reference: ARDMS Sonography Principles and Instrumentation, Chapter on Doppler Principles.
NEW QUESTION # 115
What is the effect of an increased aperture in a linear array transducer?
- A. Shorter near-field length
- B. Decreased temporal resolution
- C. Improved axial resolution
- D. Deeper focus
Answer: D
Explanation:
The aperture of a transducer is the active area that emits and receives the ultrasound waves. In a linear array transducer, increasing the aperture (using more elements for transmission and reception) results in a deeper focus because the beam is more tightly focused over a longer distance. This improves lateral resolution at greater depths, as the ultrasound beam maintains a narrower width for a longer distance. It allows for better imaging of deeper structures without sacrificing resolution.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.
NEW QUESTION # 116
Which technique averages individual frames together to improve the image?
- A. Harmonic imaging
- B. Persistence
- C. Coded excitation
- D. Compression
Answer: B
Explanation:
Persistence is a technique used in ultrasound imaging that averages individual frames together to improve the overall image quality. This process helps to reduce noise and improve the signal-to-noise ratio, leading to clearer and more stable images. By averaging multiple frames, transient artifacts are minimized, and the continuity of structures is better visualized. Persistence is particularly useful in imaging static or slow-moving structures. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Ultrasound Physics and Technology: How, Why and When" by M. Evans, C. Archer, and K. Weston
NEW QUESTION # 117
Which target group is used to evaluate transverse distance measurement accuracy in this tissue-mimicking phantom image?
- A. Option C
- B. Option A
- C. Option B
- D. Option D
Answer: D
Explanation:
In the tissue-mimicking phantom image, Option D (blue box) is used to evaluate transverse distance measurement accuracy. Phantoms are used to simulate human tissue and provide a standardized way to test the accuracy and precision of ultrasound machines. Transverse distance measurement accuracy is assessed by measuring known distances between targets in the phantom. The blue box (Option D) typically contains targets positioned to specifically test the accuracy of transverse measurements, ensuring that the ultrasound system provides reliable and precise distance readings.
References
* ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide
* "Quality Assurance for Ultrasound Imaging Systems" by AAPM (American Association of Physicists in Medicine)
NEW QUESTION # 118
What causes color flash artifact?
- A. Tissue motion
- B. Strong reflector
- C. High velocity blood flow
- D. Aliasing
Answer: A
Explanation:
Color flash artifact occurs due to tissue motion. This artifact is a type of color Doppler artifact that happens when there is movement of tissue or transducer, which causes the Doppler system to incorrectly interpret the motion as blood flow. This results in a flash of color appearing on the image where there is actually no flow. Tissue motion affects the Doppler signal, leading to misinterpretation by the system, and hence the artifact appears as a flash of color.
Reference:
ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide
"Diagnostic Ultrasound: Principles and Instruments" by Frederick W. Kremkau
NEW QUESTION # 119
Which pulsed-wave Doppler adjustment would be appropriate to correct the aliasing seen in this image?
- A. Decrease the Doppler pulse repetition frequency.
- B. Increase the spectral Doppler gain.
- C. Decrease the spectral Doppler gain.
- D. Increase the Doppler pulse repetition frequency.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Aliasing occurs in pulsed-wave Doppler imaging when the Doppler shift frequency exceeds the Nyquist limit (which is half the pulse repetition frequency, PRF). This results in a wrap-around of the Doppler signal, which appears as a reversal of flow direction (aliasing artifact).
According to standard Principles and Instrumentation references in sonography:
"To eliminate aliasing, the Doppler PRF (scale) should be increased. Increasing the PRF raises the Nyquist limit and therefore allows for higher measurable velocities without aliasing." The correct adjustment to correct this aliasing artifact isC: Increase the Doppler pulse repetition frequency.
This effectively increases the Nyquist limit and resolves the wrap-around aliasing appearance.
Options A and B (adjusting the spectral Doppler gain) would only change the appearance of the Doppler waveform (i.e., its amplitude and brightness) but would not affect aliasing. Option D (decreasing the PRF) would actually worsen the aliasing by lowering the Nyquist limit.
Therefore, the correct choice is toincrease the Doppler PRF.
NEW QUESTION # 120
How is intensity of an ultrasound beam measured?
- A. Autocorrelation
- B. Reynold's number
- C. Doppler equation
- D. Hydrophone
Answer: D
Explanation:
The intensity of an ultrasound beam is measured using a hydrophone. A hydrophone is a specialized device that detects and measures the acoustic pressure of the ultrasound waves in water or tissue-mimicking materials. It is highly sensitive and can measure the variations in pressure, which are used to calculate the intensity and other acoustic parameters of the ultrasound beam.
ARDMS Sonography Principles and Instrumentation guidelines
Hoskins, P. R., Thrush, A., Martin, K., & Whittingham, T. A. (2010). Diagnostic Ultrasound: Physics and Equipment.
NEW QUESTION # 121
What is the effect on the Doppler spectral waveform when sampling a vessel at a greater depth?
- A. Higher Doppler shifts
- B. Increased aliasing
- C. Higher velocity measurements
- D. Increased signal strength
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
At greater depths, pulse repetition frequency (PRF) is automatically reduced due to longer pulse travel times, lowering the Nyquist limit and increasing the likelihood of aliasing.
Principles and Instrumentation state:
"As sample depth increases, PRF decreases, lowering the Nyquist limit and increasing the risk of aliasing in pulsed-wave Doppler."
* Doppler shift depends on flow velocity and angle, not depth.
* Actual velocity measurements do not increase with depth.
* Signal strength typically decreases (not increases) due to attenuation.
Therefore, the correct answer is A: Increased aliasing.
NEW QUESTION # 122
Which resolution is degraded when utilizing multiple transmit focal zones?
- A. Axial
- B. Lateral
- C. Temporal
- D. Elevational
Answer: C
Explanation:
When utilizing multiple transmit focal zones, the ultrasound system must perform multiple transmissions at each focal depth. This process requires more time for data acquisition, which in turn decreases the frame rate.
A lower frame rate directly impacts temporal resolution, which is the ability to accurately depict moving structures over time. Thus, using multiple focal zones improves lateral resolution but degrades temporal resolution.
References:
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation guidelines.
NEW QUESTION # 123
Which control determines the amount of amplification occurring in the receiver?
- A. Overall gain
- B. Persistence
- C. Output power
- D. Dynamic range
Answer: A
Explanation:
Overall gain controls the amplification of all the received ultrasound signals uniformly. This adjustment affects the brightness of the entire image by increasing or decreasing the amplification of the echoes returning from all depths. It is a primary control for adjusting image brightness. The overall gain should be set to an appropriate level to ensure that the ultrasound image is neither too bright (over-gained) nor too dark (under-gained), allowing for optimal visualization of the anatomical structures.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.
NEW QUESTION # 124
In this image, which characteristics of flow are represented by the upper right side of a variance mode color map?
- A. Higher velocity, laminar with a negative Doppler shift
- B. Higher velocity, turbulent with a negative Doppler shift
- C. Higher velocity, turbulent with a positive Doppler shift
- D. Higher velocity, laminar with a positive Doppler shift
Answer: C
Explanation:
In a variance mode color map, the upper right side typically indicates higher velocity and turbulent flow with a positive Doppler shift. Variance mode maps are designed to display not only the mean velocity and direction of blood flow but also the presence of turbulence. The color green is often used in the upper right quadrant to represent areas of turbulence with positive Doppler shifts, which occur when the blood flow is moving towards the transducer at higher velocities and with increased chaotic motion. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Diagnostic Ultrasound: Physics and Equipment" by Peter Hoskins, Kevin Martin, Abigail Thrush
NEW QUESTION # 125
Which artifact is caused by defects in the crystals of the transducer?
- A. Dropout
- B. Ringdown
- C. Side lobe
- D. Mirror image
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Defects in transducer crystals result in missing or weakened signals along the beam path produced by those elements, creating dropout. In array transducers, dropout typically appears as vertical or horizontal dark zones depending on which elements are affected.
According to sonography instrumentation reference:
"Crystal failure results in areas of signal dropout directly beneath the defective elements due to loss of transmitted or received signals." Therefore, the correct answer is D: Dropout.
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NEW QUESTION # 126
Which artifact results from decreased attenuation?
- A. Comet tail
- B. Ringdown
- C. Enhancement
- D. Reverberation
Answer: C
Explanation:
Enhancement is an artifact that results from decreased attenuation. When an ultrasound wave travels through a medium with lower attenuation compared to surrounding tissues, it loses less energy. Consequently, the structures located deeper than the low-attenuation medium appear brighter on the ultrasound image. This artifact is commonly observed behind fluid-filled structures, such as cysts or the urinary bladder, where the sound waves encounter minimal resistance and thus less attenuation. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Diagnostic Ultrasound: Principles and Instruments" by Frederick W. Kremkau
NEW QUESTION # 127
Which type of display process rescans only the region of interest and improves resolution?
- A. Spatial compounding
- B. Frequency compounding
- C. Read magnification
- D. Write magnification
Answer: D
Explanation:
Write magnification, or pre-processing zoom, involves rescanning the region of interest (ROI) with more scan lines, thus acquiring new data for that specific area. This process increases the spatial resolution of the image in the magnified area because it gathers more detailed data by adjusting the scan parameters, resulting in improved image quality. This is different from read magnification (post-processing zoom), which simply enlarges the existing image data without increasing resolution.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hedrick WR, Hykes DL, Starchman DE. Ultrasound Physics and Instrumentation. 4th ed. Philadelphia, PA: Elsevier Saunders; 2005.
NEW QUESTION # 128
Which type of resolution is improved by transmit focus?
- A. Axial
- B. Temporal
- C. Elevational
- D. Lateral
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Transmit focus narrows the ultrasound beam width at specific depths, improving lateral resolution - the ability to distinguish two objects side-by-side.
According to Principles and Instrumentation:
"Lateral resolution depends on beam width and is improved by focusing, which narrows the beam in the lateral dimension."
* Axial resolution depends on pulse length.
* Elevational resolution depends on slice thickness.
* Temporal resolution relates to frame rate.
Therefore, the correct answer is C: Lateral.
NEW QUESTION # 129
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