Alignment of ultrasound transducer arrays and multiple aperture probe assembly
The effective aperture of an ultrasound imaging probe can be increased by including more than one transducer array and using the transducer elements of all of the arrays to render an image can greatly improve the lateral resolution of the generated image. In order to render an image, the relative positions of all of the elements must be known precisely. Systems and methods for accurately calibrating and adjusting a multi-aperture ultrasound system are disclosed. The relative positions of the transducer elements can be computed and aligned prior to and during probe assembly.
1. A multiple aperture ultrasound probe comprising:
a probe housing;
a probe bracket positioned within and secured to the probe housing;
a first transducer array secured to a substantially planar plate-shaped first precision alignment element by a layer of a solidified polymer material interposed between a first surface of the first precision alignment element and a first surface of the first transducer array, a second surface of the first precision alignment element being secured to the probe bracket, wherein the first precision alignment element is a rectangular plate comprising a plurality of bracket-mounting holes adjacent corners of the rectangle and at least two alignment mounting holes located away from the corners;
a second transducer array secured to a substantially planar plate-shaped second precision alignment element by a layer of a solidified polymer material interposed between a first surface of the second precision alignment element and a first surface of the second transducer array, the second precision alignment element being secured to the probe bracket; and
a solidified polymer material disposed in a space between the probe bracket and the probe housing.
2. The probe of claim 1 , wherein the first transducer array and the second transducer array are precisely aligned relative to the first precision alignment element and second precision alignment element, respectively.
3. The probe of claim 1 , wherein the first precision alignment element comprises at least one hole through which a quantity of solidified polymer material extends.
4. The probe of claim 3 , wherein the first precision alignment element comprises two holes, at least one of which has a quantity of solidified polymer material extending therethrough.
5. The probe of claim 1 , wherein the first surface of first transducer array is approximately parallel to a surface defined by transducer elements.
6. The probe of claim 1 , wherein only the first surface of the first transducer array is secured to only the first surface of the precision alignment element.
7. The probe of claim 1 , wherein the first precision alignment element is secured to the probe bracket by a plurality of mechanical fasteners.
8. A multiple aperture ultrasound probe comprising:
a probe housing;
a probe bracket positioned within and secured to the probe housing;
a first transducer array secured to a substantially planar plate-shaped first precision alignment element by a layer of a solidified polymer material interposed between a first surface of the first precision alignment element and a first surface of the first transducer array, a second surface of the first precision alignment element being secured to the probe bracket;
a second transducer array secured to a substantially planar plate-shaped second precision alignment element by a layer of a solidified polymer material interposed between a first surface of the second precision alignment element and a first surface of the second transducer array, the second precision alignment element being secured to the probe bracket;
wherein the probe bracket comprises a rib engaging channels in the second surfaces of the first precision alignment element and second precision alignment element; and
a solidified polymer material disposed in a space between the probe bracket and the probe housing.