![]() The use of a small-headed scanner can bring out interfaces that are oblique to the linear array beam. The sector beam was angled perpendicular to the interface (black arrow) and is now well seen. The “interface” between the bladder (black arrow) and the uterus (Ut) is poorly defined because the linear array beam is not perpendicular to the uterine wall. Of the same echogenicity as a neighboring area, but not necessarily of the same texture.įigure 5-2. An interface is usually more pronounced when the transducer is perpendicular to it ( Fig. Strong echoes that delineate the boundary of organs and that are caused by the difference between the acoustic impedance of two adjacent structures. The normal texture of several parenchymal organs is homogeneous (e.g., liver, thyroid, and pancreas). The strength of the echoes throughout the image can be varied by changing the power output from the system. Descriptive term for the amount of transducer face in contact with the patient (i.e., a small-head transducer has a small footprint). ![]() This interface has a horizontal level that varies with patient position.įootprint. Interface between two fluids with different acoustic characteristics. The normal kidney is echopenic relative to the liver (see Fig. A few echoes within a structure less echogenic. Without internal echoes not necessarily cystic.Įchopenic. Term used by some to describe an ultrasonic examination, especially in cardiac work an echocardiogram is frequently referred to as an “echo.”Įcholucent. A change in the normal echogenicity signifies a pathologic condition.Įchogram. For example, Figure 5-1 shows the normal texture of the liver and pancreas the pancreas is slightly more echogenic. Describes a structure that produces echoes. The extremity (limb) end of a body structure.Įchogenic. The spleen is slightly more echogenic than the liver.ĭistal. The gallbladder (G), a “cystic” (fluid-filled) structure, shows acoustic enhancement behind it (arrow), in the region of the duodenum (D). ![]() Note that the pancreas (P) contains more echoes than the liver (L). Transverse section of the upper abdomen showing the usual echogenicity of the organs in a young adult. The term is used (inaccurately) by some to describe any fluid-filled structure (e.g., urine-filled bladder or bile-filled gallbladder see Fig. In ultrasonography, the word cystic does not necessarily refer to a cyst. Spherical, fluid-filled structure with well-defined walls that contains few or no internal echoes and exhibits good acoustic enhancement.Ĭystic. A structure that has both fluid-filled (echo-free) and solid (echogenic) areas.Ĭontralateral. Not necessarily cystic unless there is distal echo enhancement (good through transmission).Ĭomplex. Also referred to as through transmission (information to follow see and Fig. ![]() Because sound traveling through a fluid-filled structure is barely attenuated, the structures distal to a cystic lesion appear to have more echoes than neighboring areas. ![]()
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