ガイド（2024年最新）実際のARDMS SPI試験問題
SPI試験問題集合格させるのは更新されたのは2024年年最新の認証済み試験問題
ARDMS SPI 認定試験の出題範囲：
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質問 # 46
Which artifact results from decreased attenuation?
- A. Comet tail
- B. Ringdown
- C. Reverberation
- D. Enhancement
正解：D
解説：
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
質問 # 47
Which resolution is improved by focusing?
- A. Contrast
- B. Lateral
- C. Axial
- D. Temporal
正解：B
解説：
Focusing improves lateral resolution in ultrasound imaging. Lateral resolution refers to the system's ability to distinguish between two points that are side by side (perpendicular to the sound beam's path). By focusing the ultrasound beam, the width of the beam is narrowed at the focal point, enhancing the system's ability to resolve structures that are close together in the lateral plane. This results in clearer, more detailed images of the anatomical structures.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation study materials.
Diagnostic Ultrasound: Principles and Instruments by Kremkau, F. W. (latest edition).
質問 # 48
Which type of resolution will be improved by decreasing the depth of field?
- A. Lateral
- B. Axial
- C. Elevational
- D. Temporal
正解：A
解説：
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.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments.
質問 # 49
What is the term for an ultrasound system's ability to display low-level echoes?
- A. Axial resolution
- B. Slice thickness
- C. Lateral resolution
- D. Sensitivity
正解：D
解説：
Sensitivity is the term for an ultrasound system's ability to display low-level echoes. It refers to the system's capacity to detect and accurately display weak echoes returning from tissues. High sensitivity allows the sonographer to visualize structures that produce faint echoes, such as small or low-contrast lesions. This parameter is critical for ensuring that subtle pathological changes are not missed during imaging. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Sonography: Principles and Instruments" by Joan P. Baker and Marveen Craig
質問 # 50
Which control determines the amount of amplification occurring in the receiver?
- A. Dynamic range
- B. Overall gain
- C. Persistence
- D. Output power
正解：B
解説：
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.
質問 # 51
Which is a method to reduce noise?
- A. Decrease depth
- B. Increase persistence
- C. Increase frequency
- D. Decrease beam width
正解：B
解説：
Persistence is a form of temporal averaging where consecutive frames are averaged to reduce random noise, resulting in a smoother image. Increasing persistence effectively reduces noise by averaging out transient noise artifacts while preserving the true signal. This improves image quality, although it may also reduce the temporal resolution, making it less suitable for rapidly moving structures.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hedrick WR, Hykes DL, Starchman DE. Ultrasound Physics and Instrumentation. 4th ed. Philadelphia, PA: Elsevier Saunders; 2005.
質問 # 52
What causes color flash artifact?
- A. Aliasing
- B. Tissue motion
- C. High velocity blood flow
- D. Strong reflector
正解：B
解説：
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
質問 # 53
What is the term for the change in direction of a sound wave crossing a tissue boundary at an oblique angle?
- A. Refraction
- B. Attenuation
- C. Reflection
- D. Absorption
正解：A
解説：
Refraction is the change in direction of a sound wave as it crosses a boundary between two different tissues at an oblique angle, where there is a difference in propagation speeds between the tissues. This bending of the sound wave path occurs due to the change in speed, causing the wave to change direction according to Snell's law. Refraction can result in artifacts such as edge shadowing and displacement of structures in an ultrasound image.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hedrick WR, Hykes DL, Starchman DE. Ultrasound Physics and Instrumentation. 4th ed. Philadelphia, PA: Elsevier Saunders; 2005.
質問 # 54
What reduces speckle and increases visualization of specular reflectors and attenuated structures?
- A. Spatial compounding
- B. Elastography
- C. Extended field of view
- D. Pixel interpolation
正解：A
解説：
Spatial compounding involves acquiring multiple frames from different angles and averaging them. This technique reduces speckle noise, which is a granular interference pattern, and enhances the visualization of specular reflectors (smooth surfaces that reflect sound in a single direction) and attenuated structures (structures that reduce the intensity of the sound beam). By averaging frames from different angles, spatial compounding improves image quality and contrast resolution.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Hedrick, W. R., Hykes, D. L., & Starchman, D. E. (2005). Ultrasound Physics and Instrumentation.
質問 # 55
Which adjustment is needed to optimize the waveform below?
- A. Increase pulse repetition frequency
- B. Increase wall filter
- C. Decrease gain
- D. Lower baseline
正解：D
解説：
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.
質問 # 56
According to Poiseuille's law, a change in which parameter would have the greatest influence on blood flow?
- A. Vessel radius
- B. Length of vessel
- C. Pressure gradient
- D. Viscosity of the fluid
正解：A
解説：
According to Poiseuille's law, the flow rate of a fluid through a vessel is directly proportional to the fourth power of the vessel's radius. Therefore, a small change in the radius of the vessel has a much larger effect on blood flow compared to changes in pressure gradient, length of the vessel, or viscosity of the fluid.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Poiseuille's law in medical physics and hemodynamics literature.
質問 # 57
Which index is related to the likelihood of cavitation?
- A. Acoustical output
- B. Mechanical
- C. Temporal
- D. Thermal
正解：B
解説：
The Mechanical Index (MI) is related to the likelihood of cavitation, which is the formation of gas bubbles in a liquid due to the low-pressure regions of the ultrasound wave. MI is a parameter that predicts the potential for mechanical bioeffects, including cavitation. A higher MI indicates a greater likelihood of cavitation occurring. It is calculated based on the peak negative pressure and the frequency of the ultrasound wave.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments.
質問 # 58
Which factor influences color flow imaging frame rate?
- A. Line density
- B. Dynamic range
- C. Variance map selection
- D. Filter selection
正解：A
解説：
The frame rate in color flow imaging is influenced by several factors, one of the most significant being line density. Line density refers to the number of ultrasound lines used to create an image. Increasing line density improves spatial resolution but requires more time to acquire each frame, thereby reducing the frame rate. Other factors such as filter selection, dynamic range, and variance map selection can affect the quality of the color flow image, but they do not have as direct an impact on frame rate as line density does.
Reference: ARDMS Sonography Principles and Instrumentation, Chapter on Color Doppler Imaging.
質問 # 59
During a color Doppler scan, which angle to flow would most likely result in no color being visualized?
- A. 88 degrees
- B. 45 degrees
- C. 175 degrees
- D. 3 degrees
正解：A
解説：
Color Doppler imaging is most effective when the angle between the ultrasound beam and the flow of blood is small.
At an angle of 88 degrees, the flow of blood is nearly perpendicular to the ultrasound beam.
When the angle is close to 90 degrees, the Doppler shift (frequency change) approaches zero, resulting in little to no color being visualized on the Doppler image.
Thus, to obtain a color signal, the angle should be optimized to be as close to 0 degrees as possible, with 60 degrees being the practical limit for accurate Doppler measurements. Reference:
ARDMS Sonography Principles and Instrumentation guidelines on Doppler angle and its effect on Doppler imaging.
質問 # 60
What occurs when the pulse repetition frequency is less than twice the Doppler shift frequency?
- A. Range ambiguity
- B. Spectral broadening
- C. Aliasing
- D. Propagation speed artifact
正解：C
解説：
Aliasing occurs in Doppler ultrasound when the pulse repetition frequency (PRF) is less than twice the Doppler shift frequency (Nyquist limit). When this condition is met, the Doppler signals are not sampled frequently enough to accurately measure the frequency shifts, resulting in the misrepresentation of the flow velocities. This causes the aliasing artifact, where high-velocity flows are displayed incorrectly as wrapping around the baseline, leading to potential diagnostic errors.
Reference: ARDMS Sonography Principles and Instrumentation (SPI) Review, Doppler Artifacts section.
質問 # 61
Which system control adjusts amplification of signals as a function of depth?
- A. Reject
- B. Transmit focus
- C. Time gain compensation
- D. Output power
正解：C
解説：
Time Gain Compensation (TGC), also known as Depth Gain Compensation (DGC), is used to adjust the amplification of ultrasound signals based on their depth. As ultrasound waves travel deeper into the tissue, they become weaker due to attenuation. TGC compensates for this attenuation by progressively increasing the gain for deeper echoes, ensuring that structures at different depths appear with similar brightness on the ultrasound image. This function is critical for creating a uniform image and accurately visualizing deeper anatomical structures.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.
質問 # 62
What is the primary reason to use compression?
- A. Reduce the focal region
- B. Increase line density
- C. Improve the axial resolution
- D. Adjust the contrast resolution
正解：D
解説：
Compression in ultrasound imaging adjusts the range of grayscale displayed, affecting the contrast resolution.
This function allows sonographers to enhance the differentiation between structures of varying echogenicities.
By modifying the contrast resolution, sonographers can better visualize subtle differences in tissue composition and improve the diagnostic quality of the images.
Increasing contrast resolution is particularly important in differentiating between fluid-filled cysts and solid masses. Reference:
ARDMS Sonography Principles and Instrumentation guidelines on image processing and contrast resolution.
質問 # 63
What is the benefit of using a wall filter?
- A. Reduces aliasing
- B. Increases signal-to-noise ratio
- C. Removes low-frequency signals
- D. Increases velocity range
正解：C
解説：
A wall filter in Doppler ultrasound is designed to remove low-frequency signals that are often caused by tissue motion, vessel wall movement, or other forms of motion artifact. These low-frequency signals can clutter the Doppler spectrum, making it difficult to accurately interpret blood flow velocities. By filtering out these unwanted low-frequency signals, the wall filter helps to enhance the clarity of the Doppler signal, allowing for more accurate measurements of blood flow velocities.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.
質問 # 64
Which statement characterizes the primary difference between image A and image B?
- A. Image A demonstrates a shallower field of view.
- B. Image A demonstrates a better axial resolution.
- C. Image A demonstrates a lower overall gain setting.
- D. Image A demonstrates a wider scale of contrast.
正解：C
解説：
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.
質問 # 65
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