City College of New York

Other

Xiangchun Liang

Robert R Alfano

Ping-Pei Ho

Leming M Wang

Feng Liu

Ping Pei Ho

Quan-Zhen Wang

Pierre A Galland

A method for detecting the presence of one or more calcifications within a portion of a turbid medium, such as a breast tissue. According to one aspect, the method involves illuminating at least a portion of the turbid medium with light, whereby light emerges from the turbid medium consisting of a ballistic component, a snake-like component and a diffuse component, temporally and/or spatially gating the emergent light to preferentially pass the ballistic and/or snake-like components, using the temporally and/or spatially gated light to form an image of the illuminated portion of the turbid medium, and examining the image for the presence of one or more calcifications. Wavelength difference images may also be used to highlight tumors and calcification regions. The foregoing method may be used to form optical images of breast tissues, with the presence in such images of calcifications suggestive of cancer being used to identify the corresponding breast tissues as good candidates for biopsy and screening for tumors.

Optical imaging of breast tissues to enable the detection therein of

A system for imaging an object in or behind a highly scattering medium includes a light source for illuminating the highly scattering medium with a beam of light. The light emerging form the highly scattering medium consists of a ballistic component, snake-like component and a diffuse component. A 4F Fourier imaging system including a Fourier spatial filter located at 2F is used to form a time gated image of the emerging light, the time gated image consisting primarily of the ballistic component and the snake-like component.

Ultrafast optical imaging of objects in or behind scattering media

A method of forming 2 dimensional image of a translucent object in or behind a turbid medium. In one embodiment, the method comprises the steps of illuminating the translucent object through one side of the turbid medium with an ultrafast pulse of light, the light emergent from the opposite side of the turbid medium consisting of a ballistic component, a snake-like component and a diffuse component. The emergent light is then temporally and spatially gated to preferentially pass the ballistic component and the snake-like component. Preferably, the temporal and spatial gating is achieved by positioning the Kerr cell of an optical Kerr gate at the 2F spectral plane of a 4F Kerr-Fourier imaging system. At the appropriate time, that portion of the Kerr cell located at the focal point of the 2F spectral plane is gated open, allowing predominantly ballistic and snake-like components of the transilluminated light to pass therethrough. A cooled CCD detector is positioned at the 4F spectral plane to form a 2-dimensional image of the temporally and spatially gated light.

2-dimensional imaging of translucent objects in turbid media

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Bronx, NY, United States of America

Xiangchun Liang