SPI PRACTICE TEST QUESTIONS AND
ANSWERS PLUS RATIONALE NEW
2026-2027 UPDATE
39 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Demonstrate mastery of core concepts
2 SPI Practice Test Questions and Answers Plus Rationale New 2026
3 2027 Update
4 Foundations of SPI Practice Test Questions and Answers Plus Rationale New 2026-2027 Update
5 Applied SPI Practice Test Questions and Answers Plus Rationale New 2026-2027 Update
6 Advanced SPI Practice Test Questions and Answers Plus Rationale New 2026-2027 Update
7 SPI Practice Test Questions and Answers Plus Rationale New 2026-2027 Update Review
ABSTRACT
This study document brings together 39 carefully worded exam questions drawn from SPI Practice
Test Questions and Answers Plus Rationale New 2026-2027 Update, with the strongest emphasis
placed on Demonstrate mastery of core concepts, SPI Practice Test Questions and Answers Plus
Rationale New 2026 and 2027 Update. Every item follows the wording style and level of reasoning
you meet in the real paper, and each one is paired with a clear rationale so the correct choice is
never a guess. Work through the set at your own pace, mark the questions that slow you down,
then come back to them until the reasoning feels automatic. Learners who revise this way walk into
the exam room recognising the pattern behind the questions instead of meeting them for the first
time. Keep going - steady, honest practice is what turns a difficult paper into a comfortable pass.
Page 1
,Q1 DEMONSTRATE MASTERY OF CORE CONCEPTS
A Doppler spectral tracing shows a peak systolic velocity of 2.4 m/s in the
common carotid artery with spectral broadening and a low-resistive, continuous
diastolic component. Which hemodynamic interpretation is most consistent with
these findings?
A. Normal common carotid waveform with physiologic diastolic flow
B. Turbulence distal to a critical stenosis producing post-stenotic flow alteration
C. Proximal high-grade stenosis or occlusion with compensatory vasodilation and collateral flow
CORRECT
D. External carotid artery flow pattern with high peripheral resistance
RATIONALE: A low-resistive, continuous diastolic common carotid waveform with elevated
velocities signals compensatory vasodilation from a proximal high-grade stenosis or occlusion,
redirecting flow through collaterals. Normal common carotid flow is low-resistive but not this
elevated, post-stenotic turbulence typically shows spectral broadening without continuous
diastolic augmentation, and external carotid flow is high-resistive with sharp systolic upstroke and
minimal diastole.
Q2 DEMONSTRATE MASTERY OF CORE CONCEPTS
During a venous duplex examination, the popliteal vein is non-compressible and
shows no spontaneous flow, but augments briskly with distal compression and
demonstrates phasic respiratory variation. What is the most likely explanation?
A. Acute deep vein thrombosis with complete occlusion CORRECT
B. Chronic post-thrombotic syndrome with recanalization
C. Technical failure from excessive transducer pressure
D. Normal vein with extrinsic compression from a popliteal cyst
RATIONALE: Non-compressibility with absent spontaneous flow but preserved augmentation
indicates acute occlusive deep vein thrombosis with distal collaterals still able to transmit flow.
Chronic post-thrombotic changes usually show partial compressibility and continuous or
diminished phasic flow, technical failure would not produce augmentation, and a popliteal cyst
typically compresses without eliminating spontaneous flow or causing non-compressibility.
Page 2
, Q3 DEMONSTRATE MASTERY OF CORE CONCEPTS
An arterial duplex of the lower extremity reveals a focal velocity increase from 0.8
m/s pre-stenotic to 4.2 m/s at the stenosis, with post-stenotic spectral broadening
and a parvus et tardus waveform distally. Which parameter best quantifies the
hemodynamic severity of this lesion?
A. Peak systolic velocity alone at the stenosis
B. Peak systolic velocity ratio between stenosis and pre-stenotic segment CORRECT
C. Resistive index distal to the stenosis
D. Pulsatility index proximal to the stenosis
RATIONALE: The peak systolic velocity ratio (stenosis-to-pre-stenotic) is the most reliable
indicator of stenosis severity because it controls for systemic hemodynamic variables. Peak
systolic velocity alone is affected by cardiac output and vessel size, resistive index reflects distal
bed resistance rather than lesion severity, and proximal pulsatility index does not directly quantify
the stenosis.
Q4 DEMONSTRATE MASTERY OF CORE CONCEPTS
Which ultrasound artifact is most likely to produce a false-negative diagnosis of
deep vein thrombosis in the popliteal vein when using compression sonography?
A. Acoustic shadowing from a calcified plaque in the adjacent popliteal artery CORRECT
B. Refraction artifact from the fascia lata
C. Mirror image artifact from the femoral condyle
D. Speed propagation error from a thick subcutaneous layer
RATIONALE: Acoustic shadowing from a calcified popliteal artery plaque can obscure the
underlying vein, preventing adequate compression and creating a false-negative result.
Refraction, mirror image, and speed propagation errors do not typically mask non-compressibility
in the popliteal fossa and are less likely to cause a false-negative DVT diagnosis.
Page 3
ANSWERS PLUS RATIONALE NEW
2026-2027 UPDATE
39 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Demonstrate mastery of core concepts
2 SPI Practice Test Questions and Answers Plus Rationale New 2026
3 2027 Update
4 Foundations of SPI Practice Test Questions and Answers Plus Rationale New 2026-2027 Update
5 Applied SPI Practice Test Questions and Answers Plus Rationale New 2026-2027 Update
6 Advanced SPI Practice Test Questions and Answers Plus Rationale New 2026-2027 Update
7 SPI Practice Test Questions and Answers Plus Rationale New 2026-2027 Update Review
ABSTRACT
This study document brings together 39 carefully worded exam questions drawn from SPI Practice
Test Questions and Answers Plus Rationale New 2026-2027 Update, with the strongest emphasis
placed on Demonstrate mastery of core concepts, SPI Practice Test Questions and Answers Plus
Rationale New 2026 and 2027 Update. Every item follows the wording style and level of reasoning
you meet in the real paper, and each one is paired with a clear rationale so the correct choice is
never a guess. Work through the set at your own pace, mark the questions that slow you down,
then come back to them until the reasoning feels automatic. Learners who revise this way walk into
the exam room recognising the pattern behind the questions instead of meeting them for the first
time. Keep going - steady, honest practice is what turns a difficult paper into a comfortable pass.
Page 1
,Q1 DEMONSTRATE MASTERY OF CORE CONCEPTS
A Doppler spectral tracing shows a peak systolic velocity of 2.4 m/s in the
common carotid artery with spectral broadening and a low-resistive, continuous
diastolic component. Which hemodynamic interpretation is most consistent with
these findings?
A. Normal common carotid waveform with physiologic diastolic flow
B. Turbulence distal to a critical stenosis producing post-stenotic flow alteration
C. Proximal high-grade stenosis or occlusion with compensatory vasodilation and collateral flow
CORRECT
D. External carotid artery flow pattern with high peripheral resistance
RATIONALE: A low-resistive, continuous diastolic common carotid waveform with elevated
velocities signals compensatory vasodilation from a proximal high-grade stenosis or occlusion,
redirecting flow through collaterals. Normal common carotid flow is low-resistive but not this
elevated, post-stenotic turbulence typically shows spectral broadening without continuous
diastolic augmentation, and external carotid flow is high-resistive with sharp systolic upstroke and
minimal diastole.
Q2 DEMONSTRATE MASTERY OF CORE CONCEPTS
During a venous duplex examination, the popliteal vein is non-compressible and
shows no spontaneous flow, but augments briskly with distal compression and
demonstrates phasic respiratory variation. What is the most likely explanation?
A. Acute deep vein thrombosis with complete occlusion CORRECT
B. Chronic post-thrombotic syndrome with recanalization
C. Technical failure from excessive transducer pressure
D. Normal vein with extrinsic compression from a popliteal cyst
RATIONALE: Non-compressibility with absent spontaneous flow but preserved augmentation
indicates acute occlusive deep vein thrombosis with distal collaterals still able to transmit flow.
Chronic post-thrombotic changes usually show partial compressibility and continuous or
diminished phasic flow, technical failure would not produce augmentation, and a popliteal cyst
typically compresses without eliminating spontaneous flow or causing non-compressibility.
Page 2
, Q3 DEMONSTRATE MASTERY OF CORE CONCEPTS
An arterial duplex of the lower extremity reveals a focal velocity increase from 0.8
m/s pre-stenotic to 4.2 m/s at the stenosis, with post-stenotic spectral broadening
and a parvus et tardus waveform distally. Which parameter best quantifies the
hemodynamic severity of this lesion?
A. Peak systolic velocity alone at the stenosis
B. Peak systolic velocity ratio between stenosis and pre-stenotic segment CORRECT
C. Resistive index distal to the stenosis
D. Pulsatility index proximal to the stenosis
RATIONALE: The peak systolic velocity ratio (stenosis-to-pre-stenotic) is the most reliable
indicator of stenosis severity because it controls for systemic hemodynamic variables. Peak
systolic velocity alone is affected by cardiac output and vessel size, resistive index reflects distal
bed resistance rather than lesion severity, and proximal pulsatility index does not directly quantify
the stenosis.
Q4 DEMONSTRATE MASTERY OF CORE CONCEPTS
Which ultrasound artifact is most likely to produce a false-negative diagnosis of
deep vein thrombosis in the popliteal vein when using compression sonography?
A. Acoustic shadowing from a calcified plaque in the adjacent popliteal artery CORRECT
B. Refraction artifact from the fascia lata
C. Mirror image artifact from the femoral condyle
D. Speed propagation error from a thick subcutaneous layer
RATIONALE: Acoustic shadowing from a calcified popliteal artery plaque can obscure the
underlying vein, preventing adequate compression and creating a false-negative result.
Refraction, mirror image, and speed propagation errors do not typically mask non-compressibility
in the popliteal fossa and are less likely to cause a false-negative DVT diagnosis.
Page 3
