Quantitative 3-d diagnostic ultrasound imaging using a modified transducer array and an automated image tracking...

Area of Science:

• Medical Imaging
• Ultrasound Technology
• Biomedical Engineering

Background:

• Accurate three-dimensional (3-D) ultrasound data acquisition from multiple 2-D image planes is crucial for medical diagnostics.
• Existing methods for 3-D ultrasound reconstruction face challenges in dimensional accuracy and efficiency.

Purpose of the Study:

• To present a novel approach for acquiring dimensionally accurate 3-D ultrasound data.
• To evaluate the performance of a prototype 3-D ultrasound array for phantom and clinical scanning.
• To assess the potential for rapid screening of carotid artery stenosis.

Main Methods:

• Utilized a modified linear-phased array with a central imaging array and perpendicularly oriented tracking arrays.
• Employed a minimum sum of absolute difference (MSAD) image matching technique with subpixel resolution to determine motion between tracking images.
• Translated the transducer to acquire multiple parallel 2-D slices, maintaining coplanarity of tracking images.

Main Results:

• Achieved a linear dimensional accuracy of 4.6% (2 sigma) in phantom scanning with an 8 MHz prototype array.
• Demonstrated superior accuracy compared to assumed average velocity (31.5%) and image-to-image decorrelation (8.4%) methods.
• Reduced carotid artery stenosis screening time from 45 minutes (2-D duplex Doppler) to 12 minutes (3-D scanning approach).

Conclusions:

• The developed 3-D ultrasound approach enables dimensionally accurate data acquisition.
• The system shows potential as a low-cost, rapid screening tool for carotid artery stenosis.
• This technology can significantly improve the efficiency of cardiovascular diagnostic procedures.