Leg perfusion evaluated by delayed administration of thallium-201

Area of Science:

• Nuclear medicine
• Vascular imaging
• Cardiology

Background:

• Assessing lower limb perfusion is crucial for diagnosing peripheral artery disease.
• Thallium-201 (Tl-201) scintigraphy is a common tool for myocardial perfusion imaging.
• Its application in evaluating lower limb perfusion requires specific timing protocols.

Purpose of the Study:

• To evaluate lower limb perfusion using intravenous Tl-201 and angiography.
• To determine the optimal timing for Tl-201 injection to assess perfusion in leg muscles.
• To compare results with previous studies using different Tl-201 administration timings.

Main Methods:

• Lower limb perfusion was assessed using intravenous Tl-201 scintigraphy.
• Angiography was performed for comparison and confirmation.
• Tl-201 was injected approximately 4 minutes after the cessation of stress.

Main Results:

• Increased Tl-201 uptake was observed in muscles supplied by stenosed vessels.
• These findings highlight the impact of injection timing on Tl-201 uptake.
• Redistribution images remained unchanged despite the altered injection timing.

Conclusions:

• Injecting Tl-201 four minutes after stress cessation effectively identifies stenosed vessels in the lower limbs.
• Variations in Tl-201 injection timing significantly influence study results.
• The described method provides a reliable approach for evaluating lower limb perfusion with Tl-201.