Cerebral vascular malformations: Time-resolved CT angiography compared to DSA

Area of Science:

• Neuroradiology
• Medical Imaging
• Vascular Neurology

Background:

• Cerebral vascular malformations (CVMs) require accurate characterization for effective treatment.
• Digital subtraction angiography (DSA) is the conventional gold standard but is invasive.
• Noninvasive imaging techniques are sought to reduce risks associated with DSA.

Purpose of the Study:

• To prospectively evaluate time-resolved CT angiography (TRCTA) using a 320-slice scanner for characterizing CVMs.
• To compare the diagnostic capabilities of TRCTA with DSA for various CVMs, including arteriovenous malformations (AVMs), dural arteriovenous fistulas (DAVFs), pial arteriovenous fistulas (PAVF), and developmental venous anomalies (DVAs).

Main Methods:

• Eighteen patients with suspected CVMs underwent TRCTA on a Toshiba Aquilion One scanner.
• Contrast-enhanced volumetric acquisitions were performed.
• TRCTA findings were independently reviewed and compared with DSA results by neuroradiologists using established classification systems and confidence grading.
• Weighted kappa coefficients were calculated to assess inter-reader agreement.

Main Results:

• Excellent to good agreement was observed between neuroradiologists assessing CVMs using TRCTA and DSA.
• TRCTA demonstrated high diagnostic quality and reader confidence in characterizing various CVMs.
• The technique showed promise in differentiating and classifying different types of vascular malformations.

Conclusions:

• Time-resolved CT angiography (TRCTA) shows potential as a noninvasive substitute for conventional DSA in evaluating cerebral vascular malformations.
• This technique may offer a safer and equally effective diagnostic pathway for specific CVMs.
• Further research may establish TRCTA as a primary diagnostic tool in select clinical scenarios.