Imaging Studies

in Lower Extremity Arterial Disease

Applied

Type

Modification

Confidence

90%

Created

Mar 19, 2026

Evidence

2 sources

Rationale

The integration incorporates the latest 2025 ACC Scientific Statement on diabetic PAD, which highlights the specific diagnostic challenges posed by medial calcification. It also adds a modern value-based medicine perspective from Raskin et al. (2025) to guide clinicians in appropriate imaging selection, emphasizing that cross-sectional and invasive imaging should be reserved for patients where the results will directly influence revascularization decisions. Abbreviations were expanded on first use as per instructions.

Evidence

Das SR et al. Management of Peripheral Artery Disease in Adults With Diabetes: 2025 ACC Scientific Statement: A Report of the American College of Cardiology. J Am Coll Cardiol. 2025. PMID: 41405527.
Verified source
PubMedDOI
Raskin D et al. A narrative review of imaging misallocation in peripheral artery disease: a value-based medicine perspective. Cardiovasc Diagn Ther. 2025. PMID: 41509627.
Verified source
PubMedDOI

Content Changes

<!-- type: diagnostic -->
**Imaging Modalities for peripheral arterial disease (PAD)**

| **Modality** | **Indications** | **Advantages** | **Limitations** |
| --- | --- | --- | --- |
| **Duplex Ultrasound**Ultrasound (DUS)** | First-line screening | No radiation/contrast, PSVpeak systolic velocity (PSV) ratios | Operator-dependent, limited by calcification [@acc2025-management] |
| **computed tomography angiography (CTA)** | Surgical planning | Detailed anatomy, fast | Contrast, radiationradiation, calcium blooming artifacts [@acc2025-management] |
| **magnetic resonance angiography (MRA)** | Contrast allergy, chronic kidney disease (CKD) | No radiation | Longer scan time, overestimates stenosis |
| **digital subtraction angiography (DSA)** | Intra-procedural | Gold standard, therapeutic | Invasive, contrast |

* **Duplex Ultrasound:**Ultrasound (DUS):** first-line imaging modality; uses peak systolic velocity (PSV)PSV ratios to grade stenosis severity (PSV ratio >2.0 indicates ≥50% stenosis).[@moneta2010] In patients with diabetes, medial arterial calcification can significantly limit the accuracy of DUS due to acoustic shadowing [@acc2025-management].
* **Computed Tomography Angiography (CTA):** provides detailed anatomic mapping of the entire arterial tree; preferred for planning revascularization in most patients.[@ahaacc2016] To ensure value-based care, CTA should be reserved for patients where revascularization is clinically indicated to avoid imaging misallocation [@raskin2025].
* **Magnetic Resonance Angiography (MRA):** alternative cross-sectional imaging when CTA is contraindicated (renal insufficiency, contrast allergy); gadolinium-based agents carry lower nephrotoxicity risk.[@prince2016]
* **Digital Subtraction Angiography (DSA):** intra-procedural gold standard for anatomic assessment; allows simultaneous diagnosis and therapeutic intervention.[@white2006] DSA is generally not recommended for primary diagnosis alone when non-invasive options are available [@raskin2025]. See [[Diagnostics in Vascular Surgery|Chapter 3]] for comprehensive imaging principles.
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