That in an ultrasound shows a smaller than expected reflex, or to the reference mean, because it returns little ultrasound signal. See ecoic, ecogenic, hyperecoic .
Danilo Enrique Noreña Benítez
It means that it produces less echo or bounce of waves. In Medicine are nodules that look a little darker in an ultrasound image. It is because they have low ecogenicity i.e. the ability to reflect ultrasound waves (brightness intensity of an ultrasound image).
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