MRI Lower Limb Angiography (MR Angiogram - Lower Limb) Preparation, Findings (Normal & Abnormal)

MRI Lower Limb Angiography (MR Angiogram - Lower Limb)

What is MRI Lower Limb Angiography?

MRI Lower Limb Angiography is a non-invasive imaging technique used to visualize the arteries of the legs. It helps in evaluating blood flow and detecting vascular abnormalities without the need for catheter-based angiography.

🔍 Why is it Done? (Indications)

1. Peripheral Arterial Disease (PAD)

2. Claudication – Pain in legs while walking

3. Rest Pain or Non-Healing Ulcers

4. Pre-Surgical Planning (e.g., Bypass or Angioplasty)

5. Aneurysms or Vascular Malformations

6. Diabetic Foot Evaluation
   
   
   

   

   mri lower limb angio 

   
   

🧪 Preparation

• Fasting: Usually 4–6 hours prior

• Check Renal Function: If contrast is to be used (GFR > 30 mL/min preferred)

• Remove Metal Objects

• Consent for Gadolinium contrast (if applicable)

Technique

Scanner: 1.5T or 3T MRI
Coils: Peripheral vascular coil / body coil

Protocol:

1. Scout Images – Localizers

2. Pre-contrast sequences – T1/T2 local anatomy

3. Contrast-enhanced MR Angiography (CE-MRA):

   • Use Gadolinium-based contrast

   • Inject via power injector (e.g., 1.5 mL/sec)

   • 3-Station technique:

     • Aorta to thigh

     • Thigh to knee

     • Knee to ankle/foot

   • Bolus tracking or timing run is done for accurate arterial phase

4. Optional: Time-Resolved Angio (TWIST/TRICKS) for dynamic flow study

🧠 Findings (Normal & Abnormal)

✅ Normal: Smooth, uninterrupted arterial flow with normal caliber

❌ Abnormalities:

• Stenosis/Narrowing of arteries

• Occlusion (blockage)

• Collateral circulation

• Aneurysms

• Plaque or thrombus