Apparatus and method for probing light absorbing agents in biological tissues
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United States of America Patent
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Nov 9, 2004
Grant Date -
May 27, 2004
app pub date -
Jan 23, 2003
filing date -
Jul 23, 2000
priority date (Note) -
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Abstract
A method and apparatus are presented for detecting an effect of interactions of electromagnetic radiation with ultrasound radiation at different locations within a region of interest in a scattering medium to thereby enable imaging of said medium. A plurality of sequences of pulses of ultrasound radiation is transmitted towards a plurality of locations, respectively, in said region of interest within an X-Y plane perpendicular to axes of propagation of the ultrasound pulses. Said region of interest is illuminated with incident electromagnetic radiation of at least one wavelength. The phases of the ultrasound radiation or the phases of the electromagnetic radiation components are appropriately controlled in order to be enable identification of the interactions between the electromagnetic and ultrasound radiation that occur at different locations along the Z-axis. Signals of the electromagnetic radiation, each being frequency modulated by a frequency of the ultrasound radiation, are detected, to thereby enabling the imaging of the region of interest.
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