A Novel 2x2D Radial Basis Functions-based Interpolation for Short Acquisition Time and Relaxed Frame Rate Ultrasound...

Area of Science:

• Biomedical Imaging
• Ultrasound Technology
• Microvascular Research

Background:

• Ultrasound localization microscopy (ULM) provides super-resolution (SR) microvascular imaging.
• High frame rates and long acquisition times limit ULM's clinical use.
• There is a need to improve ULM efficiency without compromising image quality.

Purpose of the Study:

• To relax frame rate requirements and shorten acquisition times in ULM.
• To maintain super-resolution image quality for enhanced clinical applicability.
• To develop novel reconstruction techniques for efficient ULM.

Main Methods:

• Acquiring data at lower frame rates and using reconstruction to compensate for lost information.
• Compressing acquisition time by a compression ratio (CR) and temporally upsampling in-phase-quadrature (IQ) data.
• Implementing novel bi-directional (2x2D) interpolation with radial basis function (RBF) for 3D IQ data (x-z-t) reconstruction.

Main Results:

• Successfully relaxed frame rate from 1kHz to 100 Hz.
• Reduced acquisition time by a factor of 3 to 4.
• Maintained SR image quality, including density and velocity maps, comparable to original data.

Conclusions:

• The proposed strategies effectively reduce ULM acquisition time and frame rate requirements.
• The novel 2x2D interpolation enhances temporal resolution and microbubble dynamics reconstruction.
• These advancements significantly improve the clinical applicability of ultrasound localization microscopy.