Differentiating Components of Cerebral Arteriovenous Malformations Using T1-Weighted Gradient Recall Echo MR Imaging

Area of Science:

• Neuroradiology
• Medical Imaging
• Cerebrovascular Diseases

Background:

• Cerebral arteriovenous malformations (AVMs) present challenges in conventional MRI due to signal void.
• Differentiating AVM components on standard MRI sequences is often difficult.

Purpose of the Study:

• To analyze the MR signal intensity of cerebral arteriovenous malformation components using T1-weighted gradient recalled echo (T1GRE) pulse sequences.
• To compare the efficacy of T1GRE sequences with other MRI sequences for AVM structural delineation.

Main Methods:

• Retrospective study of 29 patients with cerebral AVMs (2006-2008), excluding those with hemorrhage or prior intervention.
• All patients underwent MRI on a 3T system, including T1GRE, T2-weighted, time-of-flight (TOF), and contrast-enhanced T1-weighted (cT1) sequences.
• Digital subtracted angiography (DSA) served as the diagnostic standard; signal intensities of AVM components were recorded and compared across sequences.

Main Results:

• Nine patients (mean age 39.1 years) with nine AVMs (mean size 3.9 cm) were analyzed.
• T1GRE sequences demonstrated three distinct signal intensities (hypo-, iso-, hyper-intensity) in all patients.
• T2 and cT1 images showed only one signal intensity, while TOF images showed two; T1GRE provided the clearest structural delineation.

Conclusions:

• T1-weighted gradient recalled echo (T1GRE) pulse sequences offer superior visualization of cerebral AVM components compared to conventional MRI sequences.
• The ability of T1GRE to display varied signal intensities enhances structural delineation, proving beneficial for pre-therapeutic planning and follow-up of AVMs.