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Endourethral MRI
H H Quick1, J M Serfaty, H K Pannu
1Department of Radiology, Johns Hopkins University, Baltimore, Maryland 21287-0845, USA. HHQuick@uni-essen.de
Magnetic Resonance in Medicine
|January 9, 2001
Summary
This study introduces a new endourethral MRI technique for detailed imaging of the female urethra. This advanced method significantly improves signal-to-noise ratio and spatial resolution, aiding anatomical understanding.
Area of Science:
- Medical Imaging
- Radiology
- Anatomy
Background:
- Despite advancements in MRI, controversy persists regarding female urethral and periurethral anatomy.
- Existing MRI coils have limitations in visualizing this complex region with sufficient detail.
Purpose of the Study:
- To develop and evaluate an endourethral approach for ultra-high-resolution Magnetic Resonance Imaging (MRI) of the female urethra and periurethral tissues.
- To introduce novel radiofrequency (RF) receiver coil designs for endourethral insertion.
Main Methods:
- Developed two endourethral RF receiver coil designs: a single-loop coil and a phased array/quadrature coil.
- Incorporated features like flexible coil circuits, direct tuning/matching, active decoupling, and coaxial chokes for enhanced performance and safety.
- Utilized a metallic paddle in the phased array design to reduce mutual inductance.
- Evaluated coil performance in female human cadaver studies and in vivo pig experiments.
Main Results:
- The endourethral approach significantly increased the signal-to-noise ratio (SNR) in the region of interest.
- Achieved high-resolution MR images of the female urethra with spatial resolution as fine as 78 x 78 micrometers.
- Demonstrated histologic correlation for the generated MR images.
Conclusions:
- The novel endourethral MRI technique provides unprecedented local SNR and spatial resolution.
- This approach offers valuable new information for understanding female urethral anatomy.
- The developed RF coils are effective for ultra-high-resolution endourethral MRI.