Method, system and probe for obtaining images
First Claim
1. A process intended to make it possible to obtain images by way of waves emitted by an antenna, after reflection of these waves at the level of a target-like assembly illuminated by the waves emitted and on the basis of which the images are extracted, said antenna, including an array alignment of wave emitter/receiver transducers comprising the steps of:
- emitting a series of plane waves whose directions are different, various reception signals obtained in relation to a target point with given geometrical coordinates, being summed with amplitude and phase weightings which depend on this point in such a way as to consider there to be a re-phasing of the waves at the level of the point, as if these waves had been emitted simultaneously, and said reception signals being temporally staggered so that a forming of synthetic channels on emission is obtained.
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Accused Products
Abstract
The process, the imaging system and the probe are intended to obtain images by way of waves emitted by an antenna after reflection of these waves at the level of a target-like assembly illuminated by the waves emitted and on the basis of which the images are extracted, said antenna consisting of at least one array of wave emitter/receiver tranducers. The process carries out a series of emissions of the same type by providing the transducers with identical excitation signals which are staggered in time so as to generate an essentially plane wave at each emission. The delays between transducers is determined so that the equiphase surfaces obtained are in line or in a plane according to whether the antenna includes an array of transducers.
34 Citations
13 Claims
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1. A process intended to make it possible to obtain images by way of waves emitted by an antenna, after reflection of these waves at the level of a target-like assembly illuminated by the waves emitted and on the basis of which the images are extracted, said antenna, including an array alignment of wave emitter/receiver transducers comprising the steps of:
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emitting a series of plane waves whose directions are different, various reception signals obtained in relation to a target point with given geometrical coordinates, being summed with amplitude and phase weightings which depend on this point in such a way as to consider there to be a re-phasing of the waves at the level of the point, as if these waves had been emitted simultaneously, and said reception signals being temporally staggered so that a forming of synthetic channels on emission is obtained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wave emission/reception probe for an echographic imaging system making it possible to obtain images by way of waves emitted by an antenna of said probe, after reflection of these waves at the level of a target-like assembly illuminated by the waves emitted and on the basis of which the images are extracted, the antenna including an array of wave emitter/receiver transducers comprising:
transducers constituting the array are multiplexed in groups of N, where each transducer is multiplexed with the transducer of like rank of each of the groups comprised by the array, the number of transducers per group being chosen so that an activation signal, consisting of a pulse, of a transducer of a group of transducers of an array, is terminated before the pulse corresponding to the activation signal of the transducer of like rank of a next group. - View Dependent Claims (13)
Specification