Sample volume misregistration in linear array-based dual beam Doppler ultrasound systems.
IEEE Trans Ultrason Ferroelectr Freq Control
; 50(7): 836-47, 2003 Jul.
Article
en En
| MEDLINE
| ID: mdl-12894917
ABSTRACT
Large velocity estimation errors can occur in dual beam Doppler ultrasound velocity measurement systems when there is left/right sample volume misregistration, particularly when the interbeam angle is small. Such misregistration will occur when there is tissue inhomogeneity. This is investigated for a typical type of inhomogeneity--a layer of fat--by calculating the amount of both angle and translation misregistration occurring in such a system realized using a single linear array transducer. The complex sample volume sensitivity is calculated using a modified time domain approach, combining the spatial impulse response method with ray tracing. The effects on these misregistrations of altering the aperture sizes and their relative positions on the array is then investigated to derive an improved aperture configuration for dual beam velocity estimation. Arrangements with transmit apertures wider than the receive apertures are shown to be preferable in this context.
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Bases de datos:
MEDLINE
Asunto principal:
Arterias
/
Tejido Adiposo
/
Ultrasonografía Doppler Dúplex
Tipo de estudio:
Evaluation_studies
Límite:
Humans
Idioma:
En
Revista:
IEEE Trans Ultrason Ferroelectr Freq Control
Asunto de la revista:
MEDICINA NUCLEAR
Año:
2003
Tipo del documento:
Article
País de afiliación:
Reino Unido