Imaging method utilizing attenuation and speed parameters in inverse scattering techniques
First Claim
1. A method of imaging internals of a physical object using acoustic waves, comprising:
- a) transmitting an acoustic wave field toward the object;
b) receiving a resultant acoustic wave field with a receiver, wherein the resultant acoustic wave field is in response to the transmitted acoustic wave field reflected from or transmitted through the object;
c) determining a predicted resultant acoustic wave field derived from a model of the object;
d) determining a residual between the predicted resultant acoustic wave field and the resultant acoustic wave field;
e) back propagating the residual to determine corrections to the model of the object, wherein back propagating the residual comprises either holding the speed parameters constant while updating the attenuation parameters or holding the attenuation parameters constant while updating the speed parameters;
f) refining the model with the corrections to the model; and
g) iterating steps (a) through (f) to successively refine the model of the object over a number of iterations until a predefined condition is reached.
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Abstract
Methods for imaging the internal structures of an object using an acoustic wave field are provided. In one aspect, for example, a method of imaging internals of a physical object using acoustic waves may include transmitting an acoustic wave field toward the object, receiving a resultant acoustic wave field with a receiver, where the resultant acoustic wave field is in response to the transmitted acoustic wave field reflected from or transmitted through the object, and determining a predicted resultant acoustic wave field derived from a model of the object. The method may also include determining a residual between the predicted resultant acoustic wave field and the resultant acoustic wave field, and back propagating the residual to determine corrections to the model of the object. In another aspect, the above recited steps may be further iterated to successively refine the model of the object over a number of iterations until a predefined condition is reached.
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Citations
53 Claims
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1. A method of imaging internals of a physical object using acoustic waves, comprising:
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a) transmitting an acoustic wave field toward the object; b) receiving a resultant acoustic wave field with a receiver, wherein the resultant acoustic wave field is in response to the transmitted acoustic wave field reflected from or transmitted through the object; c) determining a predicted resultant acoustic wave field derived from a model of the object; d) determining a residual between the predicted resultant acoustic wave field and the resultant acoustic wave field; e) back propagating the residual to determine corrections to the model of the object, wherein back propagating the residual comprises either holding the speed parameters constant while updating the attenuation parameters or holding the attenuation parameters constant while updating the speed parameters; f) refining the model with the corrections to the model; and g) iterating steps (a) through (f) to successively refine the model of the object over a number of iterations until a predefined condition is reached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method of imaging internals of a physical object using acoustic waves, comprising:
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a) transmitting an acoustic wave field toward the object using a transmit array positioned at a transmit position; b) receiving a resultant acoustic wave field reflected from or transmitted through the object in response to the acoustic wave field using a receive array positioned at a receive position; c) determining a predicted resultant acoustic wave field derived from a model of the object; d) determining a residual between the predicted resultant acoustic wave field and the resultant acoustic wave field; e) back propagating the residual to determine corrections to the model of the object, wherein back propagating the residual comprises either holding the speed parameters constant while updating the attenuation parameters or holding the attenuation parameters constant while updating the speed parameters; f) refining the model with the corrections to the model; g) varying the transmit position and the receive position; and h) iterating steps (a) through (g) to successively refine the model of the object over a number of iterations until a predefined condition is reached. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification