Performing cerebral aneurysm flow measurements in the cathlab using DSA requires a number of steps to be performed correctly.
These measurements can be used to peri-interventionally assess flow diverter efficacy.
This poster explains step-by-step the appropriate approach leading to successful flow measurements,
as well as how to avoid potential pitfalls.
Aneurysm treatment by flow diverter stents aims at inducing thrombosis in the aneurysm sac by reducing the blood inflow.
thrombosis and complete aneurysm occlusion may take several months,
and during the treatment there used to be no reliable indicator whether this will be achieved.
Flow measurements based on digital subtraction angiography (DSA) acquisitions  immediately before and after stent placement in combination with the use of post-processing software allows calculation of the mean aneurysm flow amplitude (MAFA) ratio.
This ratio represents the change in...
Findings and procedure details
The measurement of flow in a cerebral aneurysm and the feeding artery using the combination of high-speed DSA and dedicated post-processing software depends on several steps that have to be performed appropriately.
The calculation of the flow information requires a 3D rotational angiography (3DRA) and a dedicated high frame-rate (60 frames per second) DSA run.
During the DSA run contrast medium is injected at a very modest pace.
The contrast medium intensity becomes modulated by the cardiac cycle.
As a result,
there is more...
The aneurysm and arterial flow can be quantified during interventional treatment with flow diverting stents,
provided that the necessary steps are correctly performed.
Fred van Nijnatten,
Image Guided Therapy Systems Innovation,
Bicêtre University hospital Paris
Department of NRI
rue du Général Leclerc
94275 Le Kremlin Bicêtre,
D.: Quantification of arterial flow using digital subtraction angiography.
K.-O.: A DSA-Based Method Using Contrast-Motion Estimation for the Assessment of the Intra-Aneurysmal Flow Changes Induced by Flow-Diverter Stents.