Imaging Studies

in Lower Extremity Arterial Disease

Applied

Type

Modification

Confidence

92%

Created

Apr 26, 2026

Evidence

1 source

Rationale

The stale acc 2025 management citation appeared three times in this section, all supporting claims (DUS limitations due to calcification, CTA artifacts, and acoustic shadowing in diabetes) that are equally or better supported by the superseding 2026 ACC/AHA guideline ACC/AHA. Per the stale guideline replacement instructions, acc 2025 management has been replaced with ACC/AHA in each of these three instances. No new content was added as the article is a guideline supersession rather than a source of novel clinical findings for this section.

Evidence

ACC/AHA. Management of Lower Extremity Peripheral Artery Disease: Guidelines From the ACC/AHA. 2026. PMID: 41252847.
Verified source
PubMedDOI

Content Changes

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

| **Modality** | **Indications** | **Advantages** | **Limitations** |
| --- | --- | --- | --- |
| **Duplex Ultrasound (DUS)** | First-line screening | No radiation/contrast, peak systolic velocity (PSV) ratios | Operator-dependent, limited by calcification [@acc2025-management][@acc2026-f] |
| **computed tomography angiography (CTA)** | Surgical planning | Detailed anatomy, fast | Contrast, radiation, calcium blooming artifacts [@acc2025-management][@acc2026-f] |
| **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 (DUS):** first-line imaging modality; uses 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].[@acc2026-f].
* **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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