Freeform gradient-index optics and methods of designing same

    公开(公告)号:US11782192B2

    公开(公告)日:2023-10-10

    申请号:US17166294

    申请日:2021-02-03

    CPC classification number: G02B3/0087 B29D11/00355 G02B1/041 G02B27/0062

    Abstract: A GRIN optic having an optical axis (z-direction) and a GRIN profile varying in the x and y-directions, the profile having one or more discontinuities extending in the x-y direction. The discontinuities may form a non-closed shape or have a non-smooth rectilinear shape. The GRIN optic may have plane-parallel surfaces. A method of designing a GRIN optic which includes mapping discretized elements in the light output specification to array elements of a linear GRIN array elements, identifying for each array element, a base refractive index n0, a gradient magnitude α, and a gradient direction θG capable of directing a beamlet from the light source to a corresponding location in the light output specification, and constructing a piecewise-continuous freeform GRIN profile of the GRIN optic by integrating the discrete linear GRIN array elements into a continuous refractive index profile.

    METHODS OF TREATING NEUROPSYCHIATRIC DISORDERS

    公开(公告)号:US20230293594A1

    公开(公告)日:2023-09-21

    申请号:US18135543

    申请日:2023-04-17

    Abstract: The present disclosure is directed to a method of treating a neuropsychiatric disorder. This method involves selecting a subject having the neuropsychiatric disorder and administering to the selected subject a preparation of glial progenitor cells at a dosage effective to treat the neuropsychiatric disorder in the subject. Another aspect of the disclosure is directed to a method of treating a neuropsychiatric disorder that includes selecting a subject having the neuropsychiatric disorder and administering, to the selected subject, a potassium (K+) channel activator at a dosage effective to restore normal brain interstitial glial K+ levels in the selected subject and treat the neuropsychiatric disorder is also disclosed.

    2D SHEAR WAVE DISPERSION IMAGING USING A REVERBERANT
SHEAR WAVE FIELD

    公开(公告)号:US20230154001A1

    公开(公告)日:2023-05-18

    申请号:US18151114

    申请日:2023-01-06

    Abstract: Within the field of elastography, a new approach analyzes the limiting case of shear waves established as a reverberant field. In this framework, it is assumed that a distribution of shear waves exists, oriented across all directions in 3D (e.g 2D space+time). The simultaneous multi-frequency application of reverberant shear wave fields can be accomplished by applying an array of external sources that can be excited by multiple frequencies within a bandwidth, for example 50, 100, 150, . . . 500 Hz, all contributing to the shear wave field produced in the liver or other target organ. This enables the analysis of the dispersion of shear wave speed as it increases with frequency, indicating the viscoelastic and lossy nature of the tissue under study. Furthermore, dispersion images can be created and displayed alongside the shear wave speed images. Studies on breast and liver tissues using the multi-frequency reverberant shear wave technique, employing frequencies up to 700 Hz in breast tissue, and robust reverberant patterns of shear waves across the entire liver and kidney in obese patients are reported. Dispersion images are shown to have contrast between tissue types and with quantitative values that align with previous studies.

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