Fundamentos da exploração ecográfica parte I: princípios biofísicos
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Data
2014-02
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Resumo
Ultrasound is a method of obtaining images by sound pulses operated at
frequencies from one to twenty MHz, conveyed into the body that are reflected
in the form of an echo. Besides being a technique with no ionizing radiation
allows real-time assessment. An ultrasound wave is a form of acoustic energy
generated when multiple piezoelectric crystals vibrate into a transducer at a
high frequency. The examination is based on three-dimensional digital
reconstruction of a two-dimensional image acquired through common
multifrequency transducer. Optimizing images in grayscale can be obtained by
adjusting the flow of power, gain, focal zone, field of view, density of lines,
curves, gray scale, dynamic range and persistence. The tool Doppler
associated with conventional ultrasound provides real-time information on the
vascular architecture and hemodynamic aspects of vessels in several organs
and can be demonstrated by pulsed Doppler, color Doppler and power Doppler.
Thus, the aim with this study was to review the biophysical principles of
ultrasound scanning, since they are of fundamental importance for the
diagnostic aid in veterinary medicine.
Descrição
Palavras-chave
Cristais piezoelétricos, Doppler, Ecografia, Ultrassom, Echography, Piezoelectric crystals, Ultrasound
Citação
DIAS, Luzia Renata Oliveira et al. Fundamentos da exploração ecográfica parte I: princípios biofísicos. Pubvet, Londrina, v. 8, n. 4, p. 1-28, fev. 2014.