Improving real-time ultrasound spine imaging with a large-aperture array

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Radiology

Background:

• Ultrasound is a safe, low-cost imaging modality for spinal diagnostics and interventions.
• Spine ultrasonography faces challenges due to complex anatomy and bone acoustic shadowing.
• Computed tomography (CT) and magnetic resonance imaging (MRI) are current standards but have limitations.

Purpose of the Study:

• To overcome limitations of conventional spine ultrasonography.
• To evaluate the efficacy of a large-aperture array with diverging wave imaging for spinal applications.
• To assess the system's accuracy and utility in visualizing spinal structures and guiding interventions.

Main Methods:

• Utilized an 8.8 cm, 384-element large-aperture array with full aperture imaging protocols.
• Employed ultrafast, diverging wave acquisition for volumetric scanning across multiple vertebrae in 5 seconds.
• Conducted imaging in seven healthy volunteers and compared results with CT scans.
• Simulated a lumbar puncture to assess needle tip visualization.

Main Results:

• The large-aperture array and diverging wave transmission significantly improved resolution, contrast, and visualization.
• Enhanced visualization of the spinal canal, venous plexuses, and facet joints was achieved compared to conventional probes.
• Coregistered CT and ultrasound scans confirmed the imaging accuracy.
• Successful needle tip visualization was demonstrated throughout a simulated lumbar puncture trajectory.

Conclusions:

• Large-aperture arrays combined with diverging wave imaging are effective for spine imaging.
• This advanced ultrasound approach offers a valuable tool for spinal diagnostics and image-guided interventions.
• The technology presents a promising, safe, and cost-effective alternative to existing spinal imaging methods.