2/29/2024 0 Comments Usg carotid doppler![]() The IMT should be measured on a segment without a focal lesion. In one study, the success rate for far wall measurement was 89 % (109/122) in the common carotid artery and 38 % (140/366) in the ICA. The IMT is generally measured on the distal common carotid artery at the far wall because the common carotid artery is easier to image and less variable than the ICA due to the angle of the beam or depth of the vessel. It would be better that the carotid artery is parallel to the probe surface to minimize the overestimation of the IMT from the diagonal measurement. The distance between the upper and lower bright line represents the thickness of the intima and media layer. The interface between the intima and media does not produce any interface. In the far wall, the upper bright line is the interface between the blood and intima, and the lower bright line is the interface between the media layer and adventitia layer. The optimal gray-scale image of the longitudinal scan of the carotid artery, which passes by the center of the carotid artery, shows two bright interfaces along the artery wall. The IMT is measured on a two-dimensional (2D) gray-scale image. The intima-medial thickness (IMT) has been widely used as one of the parameters of atherosclerosis. Intima-Medial Thickness Intima-Medial Thickness Being certain of which is the ECA and the ICA is important in case one of them is occluded. This so-called “temporal tapping” is a useful tool in differentiating the ICA from the ECA ( Fig. This temporal artery tapping-induced artifact is not seen from the ICA. Another way to differentiate the ECA from the ICA is that during the acquisition of the ECA Doppler spectrum, placing the fingertips on the ipsilateral temporal artery generates a serration-like artifact on the Doppler spectrum from the ECA. The velocity difference between the systolic phase and diastolic phase of the ICA is smaller than that of the ECA. The Doppler spectrums from the ICA show a lower resistive pattern ( Fig. The ECA has branches such as the lingual artery, but the ICA does not. The ICA is located posterior and lateral to the ECA. The examiner should be able to differentiate the internal carotid artery (ICA) from the external carotid artery (ECA). Ultrasonography cannot show the proximal segment of the left common carotid artery. The left common carotid artery arises from the aortic arch. Ultrasonography can show the most proximal segment of the common carotid artery. The right carotid artery arises from the right brachiocephalic artery.
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