Image signal-processing system based on synthetic aperture technique
First Claim
1. An apparatus for reconstructing an image signal of an object on the basis of a synthetic aperture technique, said apparatus comprising:
- (a) transducer means for emitting a radiation to the object and for detecting the corresponding radiation reflected from the object to convert the reflected radiation into an electrical signal;
(b) hologram generator means, connected to said transducer means, for generating hologram data representing at least one hologram signal in response to said electrical signal and for digitizing said hologram data to have a predetermined first number of bits; and
(c) computer means, connected to said hologram generator means, for receiving said digital hologram data to perform a predetermined arithmetic operation including additions and multiplications, based on the syntheitc aperture technique, on said digital hologram data and digital kernel function data, thereby producing a reconstructed image signal of the object, said digital kernal function data being quantized to have a second number of bits smaller than the first number of bits and have the absolute value of 2m ·
2-k, where "m" is zero or an integer and "k" is a positive integer, whereby the number of times the muliplications included in said arithmetic operation are replaced by inversion of the sign of said hologram data is increased to speed up the performance of said arithmetic operation for image reconstruction.
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Abstract
In an ultrasonic computed tomography system including an image signal-processing apparatus for reconstructing an image signal of an object on the basis of a synthetic aperture technique, a probe includes a transducer unit. The transducer unit emits an ultrasonic beam to the object and detects the corresponding echo wave. Hologram data is produced in response to the echo wave and then digitized to have a predetermined number of bits by A/D converters. The digital hologram data is temporarily stored in buffer memories and read out under the control of a computer unit. The computer unit has a ROM assembled therein to prestore digital kernel function data, the number of whose bits is smaller than that of the digital hologram signals. The computer unit executes a convolution on the digital hologram data and the kernel function data, thus increasing the speed of a computation needed for image reconstruction.
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Citations
6 Claims
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1. An apparatus for reconstructing an image signal of an object on the basis of a synthetic aperture technique, said apparatus comprising:
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(a) transducer means for emitting a radiation to the object and for detecting the corresponding radiation reflected from the object to convert the reflected radiation into an electrical signal; (b) hologram generator means, connected to said transducer means, for generating hologram data representing at least one hologram signal in response to said electrical signal and for digitizing said hologram data to have a predetermined first number of bits; and (c) computer means, connected to said hologram generator means, for receiving said digital hologram data to perform a predetermined arithmetic operation including additions and multiplications, based on the syntheitc aperture technique, on said digital hologram data and digital kernel function data, thereby producing a reconstructed image signal of the object, said digital kernal function data being quantized to have a second number of bits smaller than the first number of bits and have the absolute value of 2m ·
2-k, where "m" is zero or an integer and "k" is a positive integer, whereby the number of times the muliplications included in said arithmetic operation are replaced by inversion of the sign of said hologram data is increased to speed up the performance of said arithmetic operation for image reconstruction. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification