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US 6,475,150 B2Granted
System and method for ultrasonic tomography
AssigneeThe Regents of the University of California
InventorWaleed Sami Haddad
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Abstract
A system and method for doing both transmission mode and reflection mode three-dimensional ultrasonic imagining. The multimode imaging capability may be used to provide enhanced detectability of cancer tumors within human breast, however, similar imaging systems are applicable to a number of other medical problems as well as a variety of non-medical problems in non-destructive evaluation (NDE).
Claims32
A method comprising:
- recording ultrasonic tomographic transmission mode sound speed data and attenuation data to produce sound speed projection data and attenuation projection data;
- reconstructing said sound speed projection data and attenuation projection data under a straight ray approximation to produce a first reconstruction of a sound speed image and a first reconstruction of an attenuation image;
- and
- iteratively correcting said first reconstruction of said sound speed image and said first reconstruction of said attenuation image using a bent ray backprojection technique, wherein said bent ray backprojection technique calculates a gradient of said sound speed image to obtain a vector field representing the normal to variations in sound speed at every point within said medium under test.
1 more element
A computer-useable medium embodying computer program code for transmission mode ultrasonic tomography by executing the steps of:
- recording ultrasonic tomographic transmission mode sound speed data and attenuation data to produce real recorded sound speed projection data and attenuation projection data;
- reconstructing said real recorded sound speed projection data and attenuation projection data under a straight ray approximation to produce a first reconstruction of a sound speed image and a first reconstruction of an attenuation image;
- and
- iteratively correcting said first reconstruction of said sound speed image and said first reconstruction of said attenuation image using a bent ray backprojection technique, wherein said bent ray backprojection technique calculates a gradient of said sound speed image to obtain a vector field representing the normal to variations in sound speed at every point within said medium under test.
1 more element
Dependencies are inferred from the claim text.