Consideration of stringlike artifacts detected during carotid ultrasound examination

UETA Ayami, TOJO Mai, MIYAMOTO Syohei, AOJI Chiaki, KIYOTO Yumi, TANIUCHI Ryousui

doi:10.14932/jamt.18-116

<p>During an ultrasound examination, we sometimes depict stringlike artifacts extending from the blood vessel wall of the carotid artery and it is necessary to distinguish them from intimal flaps. Therefore, we examined the occurrence of these artifacts and report some findings. We verified whether the stringlike artifacts arose from the left or right carotid arteries in 30 healthy subjects. We investigated the blood vessel diameters of the common carotid artery (CCA) and the carotid sinus (CS), the ratio of the blood vessel diameter of the CS to that of the CCA (CA/CCA diameter ratio), the maximum blood flow velocity and diastolic blood flow velocity of the CCA, the bend angle of the CS, and the heart rate. As a result, stringlike artifacts were depicted from the blood vessel wall of the CCA into the CS in 10 out of 60 right and left carotid arteries in 9 out of the 30 subjects. In addition, the following results were obtained: the blood vessel diameter of the CCA, the CA/CCA diameter ratio, and the bend angle of the CS were significantly larger in the group in which the artifacts were observed. As for the other factors, there were no significant differences between the two groups. These findings suggest that the velocity difference in the artery is generated by the shape of the artery, which extends from the CS to the CCA, or by the enlarged angle at this junction. Therefore, we believe that the artifacts arise from the effect of this velocity difference.</p>

Consideration of stringlike artifacts detected during carotid ultrasound examination

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