Simulations of lesion detection using a combined phased array LHMI-technique

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Acoustic Physics

Background:

• Ultrasound-based elasticity imaging has advanced significantly.
• Radiation force stimulation, using single or dual-frequency sonication, is a key technique.
• Combined or separate transducers can be used for sonication and data acquisition.

Purpose of the Study:

• To simulate lesion detection using localized harmonic motion imaging (LHMI).
• To evaluate the performance of a combined phased array for simultaneous thermal ablation and lesion detection.
• To assess the impact of lesion size and spacing on detection accuracy.

Main Methods:

• Simulated localized harmonic motion imaging (LHMI) using a combined phased array.
• Employed focused, single-frequency amplitude-modulated sonication for harmonic motion induction.
• Utilized pulse-echo tracking with selected array elements to monitor induced displacements.

Main Results:

• Lesion size influenced the induced displacement around the sonication point.
• Displacement changes were detectable with limited tracking elements, but exact lesion size estimation was inaccurate.
• Two 2.5mm radius lesions were distinguishable if separated by at least 2.5mm.

Conclusions:

• LHMI shows promise for lesion detection using combined ultrasound arrays.
• Current simulation indicates limitations in precise lesion size determination.
• The technique demonstrates potential for differentiating closely located lesions.