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ARDMS SPI study guide

ARDMS SPI, administered by ARDMS, is mapped here as 5 topic areas; the heaviest are Apply Doppler Concepts (34%), Optimize Sonographic Images (26%) and Perform Ultrasound Examinations (23%).

About this course: Practice ultrasound physics, Doppler, image optimization, transducers and safety with audio teaching and recall cards.

ARDMS SPI at a glance

Questions
110
Time allowed
2 hours
Passing standard
555 scaled (scale 300–700; FIXED scaled cut, not a raw %)
Format
multiple choice (~100 scored + ~10 unscored pilot)
Standard / edition
2023 task-based Content Outline
Administered by
ARDMS

Source: 2023 task-based Content Outline, ARDMS. Confirm current details with the exam owner before you book.

Topic areas and weights

Topic areaWeightConceptsGuide
Apply Doppler Concepts34%6Topic page
Optimize Sonographic Images26%1Section below
Perform Ultrasound Examinations23%2Section below
Provide Clinical Safety & QA10%1Section below
Manage Ultrasound Transducers7%4Section below

Topic guides at a glance

Apply Doppler Concepts

34% of the course blueprint, 6 concepts. Emphasized: Doppler shift equation: delta-f=/c, Angle/cosine effect: 0 degrees=max Doppler shift; 90 degrees=zero shift; keep beam-to-flow angle ≤60° for vascular work and Nyquist limit = PRF/2 — maximum unambiguous PW Doppler shift; worked: PRF=8 kHz → Nyquist=4 kHz. Watch for: Aliasing fixed by lowering PRF/scale — WRONG, raise it.

Study plan in this course

  1. Apply Doppler Concepts — 12 cards · free
  2. Optimize Sonographic Images — 11 cards · full course
  3. Perform Ultrasound Examinations — 9 cards · full course
  4. Provide Clinical Safety and QA — 6 cards · full course
  5. Manage Ultrasound Transducers — 6 cards · full course

Optimize Sonographic Images

Optimize Sonographic Images carries 26% of the ARDMS SPI blueprint used in this course, the second-largest of its 5 weighted areas. It spans 1 concept. The course teaches it in 1 study unit: Optimize Sonographic Images.

What Optimize Sonographic Images covers

  • Axial resolution = SPL/2; improves with higher frequency and shorter pulses; always better than lateral resolution — 02-blueprint.md §d2.01

Common mistakes in Optimize Sonographic Images

  • Swapping axial (along beam, SPL/2) and lateral (side-by-side, beam width) — the #1 Optimize confusable
  • Thinking lateral resolution is better than axial — it is not
  • Raising gain to fix deep-field darkness — use TGC instead
  • Believing higher frequency improves penetration — it worsens it
  • Confusing shadowing (attenuator) with enhancement (fluid) direction
  • Thinking more focal zones is free — it costs frame rate

Key terms for Optimize Sonographic Images

Axial resolution · Lateral resolution · TGC (time-gain compensation) · Dynamic range · Artifacts

Official references for Optimize Sonographic Images

  • 02-blueprint.md §d2.01
  • 02-blueprint.md §d2.02
  • 02-blueprint.md §d2.03
  • 02-blueprint.md §d2.04
  • 02-blueprint.md §d2.05
  • 02-blueprint.md §d2.06
  • 02-blueprint.md §d2.07
  • 02-blueprint.md §d2.08
  • 02-blueprint.md §d2.09
  • 02-blueprint.md §d2.10
  • 02-blueprint.md §d2.11

In the app this area comes with 11 memory cards and 29 module-quiz questions in the full course.

Perform Ultrasound Examinations

Perform Ultrasound Examinations carries 23% of the ARDMS SPI blueprint used in this course, the third-largest of its 5 weighted areas. It spans 2 concepts. The course teaches it in 1 study unit: Perform Ultrasound Examinations.

What Perform Ultrasound Examinations covers

  • Pulse-echo principle: distance = / 2, with c = 1540 m/s assumed; 13 µs of round-trip time ≈ 1 cm of depth — 02-blueprint.md §d3.01
  • Knobology: output power; gain/TGC; depth; focus; frequency; power affects patient exposure, gain does not — 02-blueprint.md §d3.09

Common mistakes in Perform Ultrasound Examinations

  • Propagation speed is constant/operator-settable — WRONG, set by the MEDIUM; machine only assumes 1540
  • Impedance vs attenuation confused — reflection-at-boundary vs loss-along-path
  • Intensity vs power confused — W/cm² vs W
  • Thinking frequency changes propagation speed — it does not
  • Forgetting the ÷2 in the range equation (round-trip)

Key terms for Perform Ultrasound Examinations

Propagation speed (c) · Frequency (f) / period (T) · Wavelength (λ) · Acoustic impedance (Z) · Intensity reflection coefficient (IRC) · Attenuation · Decibel (dB) · Power vs intensity

Official references for Perform Ultrasound Examinations

  • 02-blueprint.md §d3.01
  • 02-blueprint.md §d3.02
  • 02-blueprint.md §d3.03
  • 02-blueprint.md §d3.04
  • 02-blueprint.md §d3.05
  • 02-blueprint.md §d3.06
  • 02-blueprint.md §d3.07
  • 02-blueprint.md §d3.08
  • 02-blueprint.md §d3.09

In the app this area comes with 9 memory cards and 25 module-quiz questions in the full course.

Provide Clinical Safety & QA

Provide Clinical Safety & QA carries 10% of the ARDMS SPI blueprint used in this course, the 4th-largest of its 5 weighted areas. It spans 1 concept. The course teaches it in 1 study unit: Provide Clinical Safety and QA.

What Provide Clinical Safety & QA covers

  • Two bioeffect mechanisms: thermal and mechanical/non-thermal; cavitation is NOT thermal — 02-blueprint.md §d4.01

Common mistakes in Provide Clinical Safety & QA

  • TI vs MI swapped — TI = heat/thermal; MI = cavitation/mechanical
  • Intensity vs power confused (W/cm² vs W) — resurfaces in safety context
  • Thinking higher gain raises patient exposure — only output power does
  • Cavitation classified as thermal — it is mechanical/non-thermal

Key terms for Provide Clinical Safety & QA

TI / MI · ALARA · SPTA

Official references for Provide Clinical Safety & QA

  • 02-blueprint.md §d4.01
  • 02-blueprint.md §d4.02
  • 02-blueprint.md §d4.03
  • 02-blueprint.md §d4.04
  • 02-blueprint.md §d4.05
  • 02-blueprint.md §d4.06

In the app this area comes with 6 memory cards and 11 module-quiz questions in the full course.

Manage Ultrasound Transducers

Manage Ultrasound Transducers carries 7% of the ARDMS SPI blueprint used in this course, the 5th-largest of its 5 weighted areas. It spans 4 concepts. The course teaches it in 1 study unit: Manage Ultrasound Transducers.

What Manage Ultrasound Transducers covers

  • PZT active element: piezoelectric effect converts electricity to sound and sound to electricity — 02-blueprint.md §d5.01
  • Q-factor = operating frequency / bandwidth; imaging probes are LOW-Q; CW Doppler probes are HIGH-Q — 02-blueprint.md §d5.04
  • Transducer types: Linear array; Curvilinear/convex array; Phased array — 02-blueprint.md §d5.05
  • Probe care: no autoclave; inspect for cracks; reprocess per contact level; avoid dropping/mechanical stress — 02-blueprint.md §d5.06

Common mistakes in Manage Ultrasound Transducers

  • Thinking a thicker backing/damping layer worsens axial resolution — it IMPROVES it
  • Confusing matching layer (impedance bridge to body) with backing/damping layer (shortens pulse)
  • Believing high-Q is best for imaging — low-Q is (wider bandwidth)
  • Thinking probes can be autoclaved — they cannot (Curie point)

Key terms for Manage Ultrasound Transducers

PZT · Curie point · Q-factor

How Manage Ultrasound Transducers connects to other areas

Official references for Manage Ultrasound Transducers

  • 02-blueprint.md §d5.01
  • 02-blueprint.md §d5.02
  • 02-blueprint.md §d5.03
  • 02-blueprint.md §d5.04
  • 02-blueprint.md §d5.05
  • 02-blueprint.md §d5.06

In the app this area comes with 6 memory cards and 8 module-quiz questions in the full course.

Official references

  • 02-blueprint.md §d4.03
  • 02-blueprint.md §d4.06
  • 02-blueprint.md §d5.06
  • 02-blueprint.md §d1.01
  • 02-blueprint.md §d1.02
  • 02-blueprint.md §d1.03
  • 02-blueprint.md §d1.04
  • 02-blueprint.md §d1.05
  • 02-blueprint.md §d1.06
  • 02-blueprint.md §d1.07
  • 02-blueprint.md §d1.08
  • 02-blueprint.md §d1.09
  • 02-blueprint.md §d1.10
  • 02-blueprint.md §d1.11
  • 02-blueprint.md §d1.12
  • 02-blueprint.md §d2.01

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