A three-coil comparison for MR angiography

Area of Science:

• Radiology
• Medical Imaging
• Neuroimaging

Background:

• Intracranial magnetic resonance angiography (MRA) is crucial for visualizing brain vasculature.
• Optimizing radiofrequency (RF) coil performance is key to enhancing MRA image quality.
• Existing commercial head coils may not provide optimal signal-to-noise ratio (SNR) for intracranial MRA.

Purpose of the Study:

• To compare the image quality of intracranial MRA using three distinct RF coil designs.
• To evaluate the effectiveness of specialized coils versus a standard commercial coil for neurovascular imaging.

Main Methods:

• Three RF coil types were tested: a reduced volume quadrature birdcage coil with endcap, a commercial quadrature birdcage head coil, and a four-element phased-array coil.
• Signal-to-noise ratio (SNR) was measured using a uniform cylindrical phantom.
• MRA data were acquired from 15 volunteers using a 3D time-of-flight sequence.
• Image analysis utilized signal difference-to-noise ratio (SDNR) to quantify vascular signal.

Main Results:

• Both the reduced-volume endcap and phased-array coils demonstrated significant improvements in SNR and vascular detail compared to the commercial head coil.
• The endcap coil configuration yielded the highest overall vascular signal.
• The phased-array coil provided superior results for arteries situated closer to the coil elements.

Conclusions:

• Specialized RF coils, specifically the reduced-volume endcap and phased-array designs, substantially enhance intracranial MRA image quality.
• These coils offer superior SNR and vascular visualization for neuroimaging applications.
• The choice between endcap and phased-array coils may depend on the specific vascular structures being imaged.