Volumetric Cross-Amplitude Modulation (VxAM) for Transcranial Gas Vesicle Imaging

Y-axis half-aperture partitioning enables volumetric cross-amplitude modulation on a 32×32 Vermon matrix array, achieving ~29 dB CTR single frames and ~49 dB with 100-frame averaging.

• Why it matters: xAM can detect gas-vesicle contrast quasi-artifact-free, but prior implementations were limited to 2D slices with 1D linear arrays, restricting 3D volumetric imaging.
• What they did: The authors implemented xAM on a fully sampled 2D matrix array by extending half-aperture split to 2D sub-aperture partitions, comparing X-, Y-, and diagonal bisections via angular spectrum simulations and testing the Y-split in GV-loaded tissue-mimicking phantoms and an ex vivo mouse skull.
• The result: At a 6° steering angle, the Y-split yielded ~8 dB CNR single frames and ~12 dB with 100-frame averaging through the skull, with GV inclusion still resolvable, informing matrix-array xAM design rules.

AI summary of the abstract · may contain errors · not medical advice · read the paper.