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Doppler measurements which trace the echoes of the generated soundwaves received by the probe, enable the direction and velocity of the blood flow to be depicted. The overlay of color onto the Doppler information lets these images be seen more clearly. [8] The choice of a probe will depend on the depth needed to be studied.
Absence of the portal system in a first trimester case associated with hygroma and aorto-umbilical fistula. (A): Transverse plane of the upper abdomen with color Doppler applied, showing umbilical cord insertion, stomach, the prominent hepatic artery and no afferent liver venous perfusion; (B): midsagittal plane reconstructed from a three-dimensional volume acquisition were the crown-rump ...
Ultrasonography of chronic insufficiency of the legs; Ultrasonography of deep venous thrombosis This page was last edited on 9 ...
Coronal plane, seen from medial side of lower leg, showing thrombosis of the fibular veins, with hyperechoic content and only marginal blood flow. Ultrasonography in suspected deep vein thrombosis focuses primarily on the femoral vein and the popliteal vein , because thrombi in these veins are associated with the greatest risk of harmful ...
Often Mönckeberg's arteriosclerosis is discovered as an incidental finding in an X-ray radiograph, on mammograms, in autopsy, or in association with investigation of some other disease, such as diabetes mellitus or chronic kidney disease. The diagnosis is usually confirmed by a radiography result or an ultrasonography. [27]
This reduces the flow of blood out of the leg, causing oedema, pain, and venous ulcers. [5] Entrapment is usually caused by gastrocnemius muscle. [5] Venography (using an x-ray) or magnetic resonance imaging can investigate it. [5] Surgery can be used to remove tissue creating pressure. [5]
Dagger sign; Deep lateral femoral notch sign; Deep sulcus sign; Dense artery sign; Dense hilum sign; Dense MCA sign; Dense metaphyseal bands; Dense triangle sign
Doppler ultrasound is preferable rather than venography to access the competence of the veins. Local sepsis of the lower limbs is contraindicated for this procedure. Low osmolar contrast agent with concentration of 240 mg/ml is preferable in this study. Before the procedure, oedematous leg, if any, should be elevated overnight to reduce the oedema.