Velocity Vector Imaging Technique For The Analysis And Research Of The Common Carotid Artery Wall Elasticity

This study discussed the characteristics of the carotid arterial wall motion using velocity vector imaging (VVI) technique. The carotid arterial wall motion in hypertension pations and somking students were contrasted with normal control group. To discuss the value of VVI technique in examination of characteristics of the carotid arterial wall motion and describe the carotid arterial mechanical characteristics of the movement before plaque appearance.Part1:Assessment of motion dynamic characteristics of common carotid artery wall in hypertension pations with velocity vector imagingObjective To discuss the characteristics of the carotid arterial wall motion in patients with hypertension using velocity vector imaging (VVI) technique.Methods Two-dimensional dynamic images of common carotid artery (CCA) both in twenty patients with hypertension and twenty objects as the normal control group were examined with Siemens Acuson Sequoia C512color Doppler ultrasound. The carotid artery wall was divced into six segments in average:Anterior wall, posterior wall, anterolateral wall, anterior internal wall, posterolateral wall and posterointernal wall.The negative peaks of radial velocity(Pv), positive peaks of cicumferential strain (Ps)and strain rate(Psr) of each carotid segment were measured with velocity vector imaging (VVI) technique.Results The Pv of the lateral wall and anterior wall were higher than those of the posterior wall and internal wall (P<0.05). While it had no significant difference in the hypertension subjects(P>0.05).The Pv (except the posterior wall)was higher in the control subjects than those in the hypertension subjects (P<0.05).The Ps and Psr of walls were higher in the control subjects than that in the hypertension subjects (P<0.05).Beside that, the normal common carotid artery (CCA) wall had more coordinated movement than that of hypertension patient.Conclusions VVI is an effective technique for evaluating CCA mechanical characteristics of the movement in hypertension patients, and has potential for checking the carotid diseases.Part2:Assessment of Mechanical Properties of Common Carotid Artery in somking students Using Velocity Vector ImagingObjective To discuss the characteristics of the carotid arterial wall motion in smoking students using velocity vector imaging (VVI) technique.Methods Two-dimensional dynamic images of common carotid artery (CCA) both in25smoking students and25normal students as the normal control group were examined with Siemens Acuson Sequoia C512color Doppler ultrasound. The carotid artery wall was divced into six segments in average:Anterior wall, posterior wall, anterolateral wall, anterior internal wall, posterolateral wall and posterointernal wall. Each carotid segment was measured with velocity vector imaging (VVI) technique.Results The positive peaks of cicumferential strain and strain rate were decreased significantly in somking students compared with controls while the negative peaks of radial velocity and displacement had no significant difference.Standard devitions,however,of time to positive peak velocity(Tv), negative peak strain (Ts) and strain rate (Tsr) of wall segments (except the posterolateral wall)were significantly higher in somkers(P<0.05),suggesting disturbance of symmetric arterial recovery. Besides that, there is no significant difference during the six segments wall of the same group(P>0.05).Conclusions VVI is an effective technique for evaluating CCA mechanical characteristics of the movement in somkers, and has potentiality for checking the carotid diseases.