Method and apparatus for frequency encoded ultrasound-modulated optical tomography of dense turbid media
First Claim
1. An apparatus for frequency encoded ultrasound modulated optical tomography comprising:
- a function generator operable to produce a frequency sweep signal;
an ultrasonic transducer coupled to the function generator and operable to produce an ultrasonic wave in a turbid medium in response to the frequency sweep signal;
a laser, located outside the turbid medium and operable to send a coherent beam of light into the turbid medium;
a photo multiplier tube located outside the turbid medium and operable to detect light from the laser that has traveled through the turbid medium and that has been modulated by the ultrasonic wave; and
an oscilloscope operable to display the output of the photo multiplier tube wherein differences in the oscilloscope display is indicative of an abnormality in the turbid medium.
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Abstract
An apparatus (10) for frequency encoded ultrasound modulated optical tomography is provided. A function generator (12) produces a frequency sweep signal which is applied to an ultrasonic transducer (20). The ultrasonic transducer (20) produces ultrasonic wave (25) in a turbid medium (21). Coherent light from a laser (22) is passed through turbid medium (21) where it is modulated by the ultrasonic wave (25). A photomultiplier tube (24) detects the light which passes through the turbid medium (21). The signal from the photomultiplier tube (24) is fed to an oscilloscope (30) and then to a computer (32) where differences in light intensity at different frequencies can determine the location of objects in the turbid medium (21).
66 Citations
28 Claims
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1. An apparatus for frequency encoded ultrasound modulated optical tomography comprising:
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a function generator operable to produce a frequency sweep signal; an ultrasonic transducer coupled to the function generator and operable to produce an ultrasonic wave in a turbid medium in response to the frequency sweep signal; a laser, located outside the turbid medium and operable to send a coherent beam of light into the turbid medium; a photo multiplier tube located outside the turbid medium and operable to detect light from the laser that has traveled through the turbid medium and that has been modulated by the ultrasonic wave; and an oscilloscope operable to display the output of the photo multiplier tube wherein differences in the oscilloscope display is indicative of an abnormality in the turbid medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for imaging an object located in a turbid medium comprising the steps of:
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producing a frequency sweep signal; producing an ultrasonic wave in the turbid medium in response to the frequency sweep signal; sending a coherent beam of light into the turbid medium; receiving a portion of the coherent beam of light that has been modulated by the ultrasonic wave and that has passed through the turbid medium, the coherent beam of light modulated by the ultrasound wave indicating a location of an object in the turbid medium; determining the location of the object located in the turbid medium from the coherent beam of light. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for the detection of objects located in a turbid medium comprising:
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a function generator operable to produce a frequency sweep signal; an ultrasonic transducer coupled to the function generator and a turbid medium and operable to produce an ultrasonic wave in the turbid medium in response to the frequency sweep signal; a light source, located outside the turbid medium and operable to send a coherent beam of light into the turbid medium; a light detection device located outside the turbid medium and operable to detect light from the light source that has traveled through the turbid medium and that has been modulated by the ultrasonic wave; and a computer operable to translate the signal from the light detection device and determine the location of an object in the turbid medium. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification