Pulsed ultrasound modulated optical tomography with increased optical/ultrasound pulse ratio
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[0052]The ultrasound modulated optical tomography (UOT) systems described herein utilize the combination of a pulsed ultrasound sequence that tags light propagating through an anatomical structure, and a selective lock-in camera that detects the tagged light (e.g., via parallel speckle detection (PSD)), as opposed to a conventional camera, to provide a highly efficient and scalable scheme that enables detection of highly localized and high spatial resolution UOT signals (e.g., blood-oxygen level dependent signals) at great depth inside a biological specimen, e.g., noninvasively through the entire thickness of the human skull and into the underlying cerebral cortical brain matter. The UOT systems may utilize a specific homodyne interference scheme that enables shot noise limited detection of the signal light. Such UOT signals may be used for, e.g., brain-computer interfacing, medical diagnostics, or medical therapeutics. Although the UOT systems are described herein as being used to ...
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