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Echogenicity (sometimes as echogenecity) or echogeneity is the ability to bounce an echo, e.g. return the signal in medical ultrasound examinations. In other words, echogenicity is higher when the surface bouncing the sound echo reflects increased sound waves.
] This was the start of the most popular design in the history of ultrasound scanners. Obstetric ultrasound has played a significant role in the development of diagnostic ultrasound technology in general. Much of the technological advances in diagnostic ultrasound technology are due to the drive to create better obstetric ultrasound equipment.
The ultrasound findings of tuberculous orchitis are as follow: (a) diffusely enlarged heterogeneously hypoechoic testis (b) diffusely enlarged homogeneously hypoechoic testis (c) nodular enlarged heterogeneously hypoechoic testis and (d) presence of multiple small hypoechoic nodules in an enlarged testis [Fig. 21b].
The mean sac diameter [3] can effectively estimate the gestational age [4] between 5 and 6 weeks, with an accuracy of about +/- 5 days. [ 5 ] The yolk sac and embryo should be readily identifiable when the gestational sac reaches a certain size — a yolk sac should be seen when the gestational sac is 20mm and a fetal pole should be seen when ...
Suspicious findings in a nodule are hypoechoic, ill-defined margins, absence of peripheral halo or irregular margin, fine, punctate microcalcifications, presence of solid nodule, high levels of irregular blood flow within the nodule [11] or "taller-than-wide sign" (anterior-posterior diameter is greater than transverse diameter of a nodule).
Some authors consider that early pronounced contrast enhancement of a nodule within 1–2 cm developed on a cirrhotic liver is sufficient for HCC diagnosis. These results prove that for a correct characterization of the lesions it is necessary to extend the examination time to 5 minutes or even longer. [citation needed] Fig. 11.
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Ultrasound showing dark (hypoechoic) area involving skin and subcutaneous tissue with moving internal debris in keeping with abscess [25] Ultrasound image showing an abscess, appearing as a mushroom-shaped dark (hypoechoic) area within the fibroglandular tissue of the breast