intraluminal signal loss
MRI finding characterized by absence of signal within the vessel lumen, typically indicating turbulent flow, thrombus, or severe stenosis.
Full Definition
Intraluminal signal loss refers to the absence or reduction of signal intensity within the vessel lumen on MRI sequences, particularly on time-of-flight imaging. This finding can indicate various pathological conditions including turbulent blood flow through a stenotic segment, presence of thrombus, or complete vessel occlusion. In arterial imaging, signal loss patterns help differentiate between flow-related phenomena and true pathology, requiring careful correlation with other imaging sequences and clinical context. The phenomenon is particularly important in neurovascular imaging where it may indicate critical stenosis or embolic events.
Usage
Usage note: Often abbreviated as 'signal loss' in reports; distinguish from technical artifacts when editing radiology reports.
In Context
- "The radiologist noted intraluminal signal loss in the middle cerebral artery, suggesting severe stenosis or occlusion." — MRI report
- "Intraluminal signal loss on TOF-MRA should be correlated with contrast-enhanced sequences to differentiate slow flow from complete occlusion." — Imaging protocol guidelines