Sparse 2-D array design for real time rectilinear volumetric imaging

Area of Science:

• Medical Imaging
• Ultrasound Technology
• Array Signal Processing

Background:

• Real-time volumetric imaging requires efficient transducer arrays.
• System constraints limit the number of active elements in sparse arrays.
• Optimizing sparse array designs is crucial for diagnostic ultrasound.

Purpose of the Study:

• To investigate and compare the performance of various sparse 2-D arrays for real-time rectilinear volumetric imaging.
• To evaluate different sparse array configurations under specific system limitations.
• To identify the most effective sparse array design for current technological constraints.

Main Methods:

• Computer simulations using Field II were employed to analyze array performance.
• Beamplots were generated for on-axis and off-axis cases, including dynamic focusing.
• Key performance metrics such as main lobe width, side lobe height, clutter floor, and sensitivity were quantified.

Main Results:

• The Mills cross array exhibited the best overall performance among the investigated sparse arrays.
• Performance metrics were systematically compared against a fully sampled array (gold standard).
• Sparse arrays, including vernier periodic and random designs, were evaluated.

Conclusions:

• The Mills cross sparse array design is recommended for real-time rectilinear volumetric imaging under the studied system constraints.
• Sparse array configurations significantly impact imaging performance.
• Further research may optimize sparse array designs for enhanced volumetric ultrasound capabilities.