ARDMS SPI Practice Test

The ARDMS test uses a scaled scoring system ranging from 300 to 700, with 555 required to pass. The exam includes semi-interactive console (SIC) questions that simulate real-world ultrasound machine adjustments. Practice with the free ARDMS SPI - ARDMS Sonography Principles and Instrumentation practice test on PracticeTestGeeks (7 questions with answer explanations).

ARDMS SPI Exam at a Glance

Facts verified Oct 25, 2026 against Inteleos. Dates that have passed are removed automatically.

Free ARDMS SPI - ARDMS Sonography Principles and Instrumentation Study Tools

Interactive ARDMS SPI - ARDMS Sonography Principles and Instrumentation resources on PracticeTestGeeks, free to start:

• ARDMS SPI - ARDMS Sonography Principles and Instrumentation flashcards — review key terms and concepts card by card
• ARDMS SPI - ARDMS Sonography Principles and Instrumentation study guide — topic-by-topic overview of what the exam covers
• ARDMS SPI - ARDMS Sonography Principles and Instrumentation cheat sheet — one-page printable summary for last-minute review

According to Inteleos, “The SPI exam covers approximately 110 questions over two hours.”^[1]

Worked examples: how to reason through ARDMS SPI questions

These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.

Example 1

Question: What is the primary purpose of the fast Fourier transform (FFT) in spectral Doppler ultrasound?

1. To generate color-flow images
2. To convert the raw Doppler audio signal into a frequency spectrum displayed over time
3. To correct for angle errors automatically
4. To increase the pulse repetition frequency

Answer: B. To convert the raw Doppler audio signal into a frequency spectrum displayed over time

Explanation:

The correct answer is B. The fast Fourier transform breaks the complex Doppler signal into its separate frequency components, and the machine then shows those frequencies over time as the spectral waveform.

A is wrong because color-flow images come from a different processing path that estimates flow across many sample locations. C is wrong because angle correction is something the sonographer sets by adjusting the cursor, and the transform does not do it. D is wrong because pulse repetition frequency is a transmit setting. The transform analyzes received signals and does not change how often pulses are sent.

Rule to remember: the FFT is a display and analysis step. It turns signal into spectrum and does not change acquisition settings.

Example 2

Question: Which of the following is a primary component of attenuation?

1. Amplification
2. Refraction
3. Conversion of sound to heat
4. Increased propagation speed

Answer: C. Conversion of sound to heat

Explanation:

The correct answer is C. Attenuation is the weakening of the sound beam as it travels. Its components are absorption, reflection and scattering, and absorption, the conversion of sound energy to heat, is the largest contributor in soft tissue.

A is wrong because attenuation is a loss of energy, not a gain. B is wrong because refraction is a change in direction at an interface, which does not by itself describe energy loss. D is wrong because attenuation does not raise propagation speed, which is set by the medium.

Rule to remember: attenuation means the beam loses energy, and most of that loss is heat from absorption.

Example 3

Question: During an abdominal ultrasound, a sonographer decides to increase the line density to improve lateral resolution. Which of the following is an expected trade-off for this adjustment?

1. Increased penetration depth
2. Decreased frame rate
3. Improved axial resolution
4. Decreased contrast resolution

Answer: B. Decreased frame rate

Explanation:

The correct answer is B. Each scan line needs its own pulse and listening time. More lines per frame means more time to build one frame, so the frame rate falls. This is why finer lateral sampling costs temporal resolution.

A is wrong because penetration depends mainly on frequency and attenuation, not on line density. C is wrong because axial resolution depends on spatial pulse length, so line density does not improve it. D is wrong because the question describes a gain in lateral detail, and contrast resolution is not the expected cost.

Rule to remember: better spatial detail from more lines comes at the cost of speed. Think of it as a trade between lateral and temporal resolution.

How to use these practice tests

Start with the official Inteleos SPI page so you know the format: approximately 110 questions over two hours, with 555 on a 300 to 700 scale needed to pass. Use that to plan your pacing.

Next, take one practice set per topic and write down every miss. Begin with acoustic waves and properties and attenuation, reflection and refraction, because later topics build on them. Then move to transducers, image resolution and image formation.

Spend extra time on Doppler: pulsed-wave and CW, color Doppler and artifacts, and spectral waveform analysis. Finish with bioeffects and safety and quality assurance.

For each wrong answer, state in one sentence the rule you missed, then redo that set a few days later. In the last stretch, run mixed sets such as ARDMS SPI MCQ under a two-hour limit. Our questions are written by us and are not real exam questions, so use them to find weak areas and not to predict your result.

Expect to spend approximately $525 on testing fees alone (SPI + one specialty). Investing in quality ardms test questions and answers resources can prevent costly retakes.

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Pros and Cons at a Glance

Sample ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Questions

Try these questions from our free ARDMS SPI - ARDMS Sonography Principles and Instrumentation practice tests. The correct answer and an explanation follow each question.

1. When performing angle correction for Doppler velocity calculations, ARDMS guidelines recommend keeping the Doppler angle at:

   • A. 90° for the most accurate measurement
   • B. Greater than 75° for best sensitivity
   • C. 60° or less to minimize angle-related velocity errors
   • D. Exactly 45° at all times

Answer: C. 60° or less to minimize angle-related velocity errors

Angles ≤60° are recommended because small errors in angle estimation cause proportionally larger velocity errors as the angle increases, especially above 60°.

Answer: C. TIC — because the cranial bone is in the near field of the beam

TIC (Cranial Bone Thermal Index) applies when the beam passes through the skull in the near field, as the bone absorbs energy and heats the adjacent brain tissue.

Answer: D. High MI, high TI

Both a high MI (cavitation risk) and high TI (thermal risk) together represent maximal bioeffect potential and should be minimized during embryonic development.

Answer: C. Using harmonic imaging instead of fundamental frequency

Harmonic imaging uses lower overall acoustic power and is generally considered safer thermally; in contrast, higher power, longer dwell time, and pre-existing fever all increase thermal risk.

Take the full ARDMS SPI - ARDMS Sonography Principles and Instrumentation practice test

Official Resources

• American Registry for Diagnostic Medical Sonography (ARDMS) — the credentialing body that owns the SPI exam, publishes its content outline and prerequisites, and processes your application.
• Pearson VUE ARDMS testing page — where approved candidates schedule, reschedule, or cancel their SPI and specialty exam appointments at a test center.
• Society of Diagnostic Medical Sonography (SDMS) — the professional society for sonographers, offering continuing education (CME) and practice standards after you earn your credential.