English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/8991
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)

Random Thinning of Segmented Annular Arrrays

Autor Godoy, Gregorio; Martínez-graullera, Oscar ; Ibáñez Rodríguez, Alberto; Gómez-Ullate Alvear, Luis
Palabras clave ultrasonic imaging
2D arrays
sparse array
SA array
Fecha de publicación 4-dic-2008
ResumenNowadays, two-dimensional (2D) arrays design is base in a square matrix (SM) distribution of elements, which requires a pitch of !/2 in order to eliminate grating lobes. From this condition, a 2D array will contain between 1500 and 16000 elements, which are much higher than the number of channels of present image systems. A well-known technique for reducing the number of active elements is based on randomly eliminating a part of the elements from the aperture. Segmented-annular (SA) arrays constitute an alternative to SM arrays for the generation of volumetric images, because they have lower periodicity than squared patterns, and therefore they allow increasing the inter-element distance up to ! or even further. SA arrays, then, the number of elements are divided by four with respect to SM arrays using the full aperture. However, this number is still a challenge for the existent technology, so requiring thinning the aperture. In this work, a thinning technique based on random sparse is applied to segmented-annular arrays and squared-matrix arrays. Several random layouts are applied to equivalent SM and SA arrays (equivalent arrays have the same active area and the same number of elements, which are of similar size and aspect ratio), and the comparative results are then theoretically analyzed in the paper.
Descripción Inter-noise 05 Rio de Janeiro 07-10 August 2005
URI http://hdl.handle.net/10261/8991
Aparece en las colecciones: (IAI) Comunicaciones congresos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
doc_1843.pdf991,95 kBAdobe PDFVista previa
Mostrar el registro completo

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.