TOF MRA
Also written as: TOF MRA — Time-of-Flight Magnetic Resonance Angiography
Time-of-flight magnetic resonance angiography, a non-contrast technique for visualizing blood vessels using flow-related enhancement.
Full Definition
Time-of-flight magnetic resonance angiography (TOF MRA) is a non-invasive imaging technique that exploits the flow-related enhancement of moving blood to create angiographic images without contrast agents. Fresh blood flowing into the imaging plane appears bright against stationary tissue that has been saturated by repeated radiofrequency pulses. This technique is particularly valuable for evaluating intracranial vessels, carotid arteries, and detecting vascular pathologies such as aneurysms, stenoses, and arteriovenous malformations. TOF MRA is often preferred when contrast agents are contraindicated or when multiple follow-up studies are needed.
Usage
Usage note: Commonly abbreviated; spell out on first use in formal reports.
In Context
- "TOF MRA revealed a 4mm anterior communicating artery aneurysm." — Imaging report
- "The study protocol included both TOF MRA and contrast-enhanced sequences for comprehensive vascular assessment." — Technical protocol