[Oct 31, 2025] Valid SPI Test Answers & SPI Exam PDF
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ARDMS SPI Exam Syllabus Topics:
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NEW QUESTION # 88
Which setting improves temporal resolution?
- A. Low line density
- B. Multiple focal zones
- C. Wide sector size
- D. Increased depth
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Temporal resolution reflects how quickly frames are updated (frame rate). Reducing the number of scan lines per frame (low line density) decreases acquisition time, thus increasing frame rate and improving temporal resolution.
According to sonography instrumentation reference:
"Lower line density allows for faster frame rates, improving temporal resolution at the expense of spatial resolution." Therefore, the correct answer is D: Low line density.
NEW QUESTION # 89
In this image, which artifact is demonstrated?
- A. Mirroring
- B. Range ambiguity
- C. Spectral broadening
- D. Aliasing
Answer: A
Explanation:
The artifact demonstrated in the image is mirroring. This occurs when the ultrasound beam encounters a strong reflector, such as a diaphragm or pleura, and is reflected back and forth between the object and the transducer. This results in a duplicate image appearing on the other side of the strong reflector, creating a mirror image artifact. It is crucial for sonographers to recognize and differentiate this artifact from actual anatomical structures to avoid misinterpretation.
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation study materials.
Diagnostic Ultrasound: Principles and Instruments by Kremkau, F. W. (latest edition).
NEW QUESTION # 90
Which action would increase the frame rate?
- A. Decreasing the number of focal zones
- B. Decreasing the logarithmic compression
- C. Increasing the sector width
- D. Increasing the number of lines per frame
Answer: A
Explanation:
The frame rate in ultrasound imaging is influenced by several factors, including the number of focal zones. Each focal zone requires additional transmission and reception cycles, thus decreasing the frame rate. By decreasing the number of focal zones, the system requires fewer cycles per frame, which increases the frame rate. This enhances the temporal resolution, making it easier to capture fast-moving structures in real-time imaging.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hagen-Ansert SL. Textbook of Diagnostic Ultrasonography. 8th ed. St. Louis, MO: Mosby; 2017.
NEW QUESTION # 91
Which adjustment is needed to optimize the waveform below?
- A. Decrease gain
- B. Lower baseline
- C. Increase pulse repetition frequency
- D. Increase wall filter
Answer: B
Explanation:
The waveform in the image shows spectral Doppler signals that are pushed against the upper limit of the display, indicating that the baseline is too high. Lowering the baseline allows for a better visual representation of the entire Doppler signal within the available display range. This adjustment prevents the waveform from being cut off and helps in accurately interpreting the blood flow characteristics.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Kremkau FW. Sonography Principles and Instruments. 9th ed. Philadelphia, PA: Elsevier; 2016.
NEW QUESTION # 92
Which unfocused transducer will have the greatest divergence?
- A. 4 mm aperture, 4 MHz
- B. 4 mm aperture, 6 MHz
- C. 6 mm aperture, 6 MHz
- D. 6 mm aperture, 4 MHz
Answer: A
Explanation:
Transducer beam divergence is influenced by the aperture size and frequency. A smaller aperture and lower frequency result in greater beam divergence. Among the given options, the transducer with a 4 mm aperture and 4 MHz frequency will have the greatest divergence. This is because the smaller aperture size contributes to a wider beam spread, and the lower frequency also increases the divergence compared to higher frequencies.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments. Elsevier.
NEW QUESTION # 93
Which effect does spatial compounding have on ultrasound images?
- A. Decreases shadowing
- B. Decreases propagation speed
- C. Increases shadowing
- D. Increases propagation speed
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Spatial compounding acquires multiple frames from different angles and combines them into a single image.
This technique reduces the appearance of artifacts such as shadowing and speckle noise, resulting in a smoother, more uniform image.
According to sonography instrumentation reference:
"Spatial compounding reduces artifacts like posterior shadowing and speckle by averaging data from multiple insonation angles." Therefore, the correct answer is D: Decreases shadowing.
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NEW QUESTION # 94
What produces increased attenuation within soft tissue?
- A. Higher intensity of the ultrasound beam
- B. Higher frequency of the ultrasound beam
- C. Lower intensity of the ultrasound beam
- D. Lower frequency of the ultrasound beam
Answer: B
Explanation:
Attenuation refers to the reduction in the intensity of the ultrasound beam as it travels through tissue. Higher frequency ultrasound beams experience more attenuation because they are absorbed and scattered more than lower frequency beams. This is due to the fact that higher frequency waves have shorter wavelengths and interact more with the small particles in tissues, causing greater energy loss.
Reference: ARDMS Sonography Principles and Instrumentation, Chapter on Ultrasound Physics and Instrumentation.
NEW QUESTION # 95
What does changing the displayed depth control directly affect?
- A. Pulse repetition frequency
- B. Spatial pulse length
- C. Pulse duration
- D. Transducer transmit frequency
Answer: A
Explanation:
Changing the displayed depth control directly affects the pulse repetition frequency (PRF). When the depth setting is increased, the ultrasound system needs more time to send and receive echoes from deeper structures, resulting in a lower PRF. Conversely, decreasing the depth allows for a higher PRF since the time required for the sound waves to travel to and from the structures is shorter. PRF is crucial for determining the maximum detectable velocity in Doppler ultrasound without aliasing. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Understanding Ultrasound Physics" by Sidney K. Edelman
NEW QUESTION # 96
What is an advantage of pulsed-wave Doppler over continuous-wave Doppler?
- A. Increased sensitivity to slow flow
- B. High signal-to-noise ratio
- C. Unlimited maximum detectable velocity
- D. Range resolution
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The primary advantage of pulsed-wave Doppler is its ability to provide range resolution. This means the operator can select a specific depth (sample volume) from which Doppler signals are acquired, allowing precise localization of blood flow velocities.
According to sonography instrumentation reference:
"Pulsed-wave Doppler allows for range resolution, enabling velocity measurements at a specific depth along the ultrasound beam path." Continuous-wave Doppler does not have range resolution, as it measures velocities along the entire beam path.
Therefore, the correct answer is C: Range resolution.
NEW QUESTION # 97
Which feature is a characteristic of continuous wave Doppler?
- A. Range specificity
- B. Dedicated transmit and receive crystals
- C. Aliasing
- D. Low thermal index
Answer: B
Explanation:
Continuous wave Doppler uses two crystals - one for transmitting and one for receiving ultrasound waves continuously. This allows for the measurement of high velocities without aliasing, a common limitation in pulsed wave Doppler. However, continuous wave Doppler does not have range specificity, meaning it cannot precisely determine the depth from which the Doppler signal is returning.
Reference: ARDMS Sonography Principles and Instrumentation, Chapter on Doppler Ultrasound.
NEW QUESTION # 98
In this image, which characteristics of flow are represented by the upper right side of a variance mode color map?
A close-up of a screen Description automatically generated
- A. Higher velocity, laminar with a negative Doppler shift
- B. Higher velocity, laminar with a positive Doppler shift
- C. Higher velocity, turbulent with a negative Doppler shift
- D. Higher velocity, turbulent with a positive Doppler shift
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
In variance mode color Doppler, colors are assigned based on both flow direction (Doppler shift polarity) and flow character (laminar vs turbulent). In the image:
* The vertical color bar shows standard Doppler shifts: positive shifts (toward the transducer) are displayed at the top, and negative shifts (away from the transducer) at the bottom.
* The variance mode adds horizontal color variation (from left to right), where the right side indicates increasing turbulence.
Thus, the upper right portion of the color bar indicates:
* Positive Doppler shift (flow toward the transducer)
* High velocity
* Turbulent flow
According to sonography instrumentation reference:
"In variance mode, the vertical axis represents flow direction and velocity, while the horizontal axis represents flow variance (turbulence). The upper right corner indicates high-velocity turbulent flow toward the transducer." Therefore, the correct answer is C: Higher velocity, turbulent with a positive Doppler shift.
NEW QUESTION # 99
Which type of resolution will be improved by decreasing the depth of field?
- A. Axial
- B. Temporal
- C. Lateral
- D. Elevational
Answer: C
Explanation:
Lateral resolution refers to the ability to distinguish two structures that are side by side. It is dependent on the width of the ultrasound beam. By decreasing the depth of field, the beam width is reduced at any given point along the depth, which improves the lateral resolution. This is because a narrower beam can better distinguish between objects that are close together laterally.
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments.
NEW QUESTION # 100
What determines the resonant frequency of a pulsed wave transducer?
- A. Element thickness and speed of sound in element
- B. Element diameter and element thickness
- C. Element thickness and pulse repetition frequency
- D. Element diameter and speed of sound in element
Answer: A
Explanation:
The resonant frequency of a pulsed wave transducer is determined by the thickness of the piezoelectric element and the speed of sound within that element. The resonant frequency is inversely proportional to the element thickness and directly proportional to the speed of sound in the material. Thinner elements and higher sound speeds result in higher resonant frequencies, while thicker elements and lower sound speeds result in lower resonant frequencies.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments. Elsevier.
NEW QUESTION # 101
If the speed of sound in a medium is less than the average speed of sound in soft tissue, where will the echo be placed on an image?
- A. Not visualized
- B. Laterally
- C. Too shallow
- D. Too deep
Answer: D
Explanation:
The placement of an echo on an ultrasound image is dependent on the assumption that the speed of sound in soft tissue is 1540 m/s. If the speed of sound in the medium is less than this assumed speed, the ultrasound system will interpret the returning echo as taking longer to return than it actually does. This causes the system to place the echo deeper in the image than its actual position. Therefore, the echo will be displayed "too deep" in the image.
References:
ARDMS Sonography Principles & Instrumentation Guidelines
Kremkau FW. Sonography Principles and Instruments. 9th ed. Philadelphia, PA: Elsevier; 2016.
NEW QUESTION # 102
Which change can be made in order to avoid exceeding the Nyquist limit?
- A. Decrease output power
- B. Increase output power
- C. Decrease pulse repetition frequency
- D. Increase pulse repetition frequency
Answer: D
Explanation:
To avoid exceeding the Nyquist limit and prevent aliasing in Doppler ultrasound, the pulse repetition frequency (PRF) should be increased. The Nyquist limit is half of the PRF, so by increasing the PRF, the Nyquist limit is raised, allowing the system to accurately measure higher velocities without encountering aliasing artifacts.
ARDMS Sonography Principles and Instrumentation guidelines
Zwiebel, W. J., & Pellerito, J. S. (2017).Introduction to Vascular Ultrasonography. Elsevier.
NEW QUESTION # 103
Which statement characterizes the primary difference between image A and image B?
- A. Image A demonstrates a wider scale of contrast.
- B. Image A demonstrates a better axial resolution.
- C. Image A demonstrates a lower overall gain setting.
- D. Image A demonstrates a shallower field of view.
Answer: C
Explanation:
The primary difference between Image A and Image B is the overall gain setting. Gain controls the amplification of the received echoes. A lower gain setting results in a darker image with less overall brightness, which is evident in Image A compared to Image B. Image B appears brighter, indicating a higher gain setting that amplifies the echoes more, making the structures appear more prominently.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Hedrick, W. R., Hykes, D. L., & Starchman, D. E. (2005). Ultrasound Physics and Instrumentation.
NEW QUESTION # 104
Which artifact causes a reflector to be improperly positioned on the display?
- A. Enhancement
- B. Acoustic shadowing
- C. Speckle
- D. Range ambiguity
Answer: D
Explanation:
Acoustic Shadowing: This artifact occurs when a structure absorbs or reflects most of the ultrasound waves, causing a shadow behind the structure. It does not cause improper positioning of a reflector on the display.
Speckle: This is a form of noise in ultrasound imaging that appears as granular texture. It can affect image quality but does not lead to improper positioning of reflectors.
Enhancement: This artifact occurs when the area behind a weakly attenuating structure appears brighter. It affects the brightness of the image but does not affect the position of reflectors.
Range Ambiguity: This occurs when an echo is received after the next pulse has been sent out, causing the reflector to be placed at an incorrect depth on the display. This is because the system assumes the echo came from the most recent pulse.
Reference:
"Ultrasound Physics and Instrumentation" by Frank Miele
ARDMS Sonography Principles and Instrumentation study materials
NEW QUESTION # 105
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