• Imaging and visualization: ultrasound enabled in vivo visualization of intracranial features (ventricles, cisterns, sulci) and peripheral organs, with omnidirectional scanning and computer-assisted display, demonstrating early brain and organ imaging capabilities [2], [1], [5], [6], [16].

• Biophysical safety and nonthermal effects: research on nonthermal mechanisms, threshold dosages for brain lesions, and heat role in lesion formation, outlining exposure limits and mechanisms [4], [9], [10], [19].

• Instrumentation and measurement science: development of transcutaneous blood-velocity meters, immersion scanners for 2D breast imaging, velocity measurements in water, and resonance-based sensitivity enhancements and diffractive field considerations [18], [15], [3], [14], [12].

• Foundational physical acoustics and materials: focusing of microwave acoustic beams and elastic/photoelastic properties of crystals, underscoring wave propagation and acousto-optical interactions in solid media [7], [11].

• Molecular and cellular responses to ultrasound: volume changes between conformers and degradation of macromolecules under ultrasound exposure, highlighting nonthermal molecular-scale effects [8], [19].