![]() ![]() 1, 3įIGURE 7-1 Normal arterial wall anatomy. 2 There is a close correlation between histology and ultrasound-based measurements of the intima-media thickness. This is better appreciated on the far wall than for the near wall of the CCA. 1 What is seen is due to the reflection of the ultrasound beam at the lumen-intima interface. ![]() The thickness of the intima cannot be directly imaged from the ultrasound image since it typically measures 0.2 mm or less and is below the resolution of transcutaneous ultrasound. The transition between media and adventitia also corresponds to the external elastic lamina as seen on pathologic studies. The two transition zones between the lumen and the intima and between the media and adventitia produce two parallel echogenic lines, with an intervening zone of low echoes that corresponds to the media. The outer layer is the adventitia, which is composed of connective tissue.Īll three layers can be visualized on ultrasound images ( Figure 7-1). This layer is responsible for most of the structural strength and stiffness of the artery. ![]() The middle layer is the media, which contains a preponderance of connective tissue (common carotid artery ) with an increasing proportion of smooth muscle cells (internal carotid artery ). The innermost layer abutting the lumen is the intima, or endothelial lining of the artery. The wall of every artery is composed of three layers: intima, media, and adventitia. Ultrasound Appearance of the Normal Carotid Artery Walls ![]()
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