hrvatski

3D ultrazvuk Willisovog kruga i vertebrobazilarnog sliva

Background and purpose Transcranial colour-coded sono- graphy (TCCS) is used for evaluation of the Willis circle and vertebrobasilar system (VBS). Freehanded noncontrast three- dimensional ultrasound (3D US) enables reconstructions from transcranial power Doppler (PD) imaging of the Willis circle and VBS. Patients and methods We displayed the 3D images of the Willis circle and VBS. Data acquisition was performed using 2.5 MHz sector transducer (Aloka Prosound SSD-5500), free- handed during 10 seconds, allowing PD sonography and post processed (Tom Tec imaging systems). The technique was applied in 10 patients. Results One patient was excluded due to inadequate bone win- dow. TCCS enabled visualization of only colour coded flow of all circle of Willis vessels simultaneously in one patient and all vessels of the VBS was not possible at all. Post processing and skilled rotation 3D PD data sets enabled visualization of the one side of the Willis circle in all patients but two, where only part of one arterial segment couldn't be displayed. Visualization of the communicating arteries or collateral flow in patients with occlusive disease was good. Hemodynamic analysis in TCCS was indispensable for occlusive disease evaluation and collate- ral pathways interpretation. 3D PD enabled visualization of all three vessels of the VBS simultaneously, allowing interpretation of the BA origin (neither patient had occlusive disease of that segment). Conclusions Noncontrast 3D US enables display of one side of the Willis circle or VBS simultaneously in most patients. TCCS and hemodynamic analysis is needed for the evaluation of the occlusive disease and interpretation of the collateral pathways.

3D ultrazvuk ; Willisov krug ; vertebrobazilarni sliv

nije evidentirano

engleski

3D ultrasound of the Willis circle and the vertebrobasilar system

Background and purpose Transcranial colour-coded sono- graphy (TCCS) is used for evaluation of the Willis circle and vertebrobasilar system (VBS). Freehanded noncontrast three- dimensional ultrasound (3D US) enables reconstructions from transcranial power Doppler (PD) imaging of the Willis circle and VBS. Patients and methods We displayed the 3D images of the Willis circle and VBS. Data acquisition was performed using 2.5 MHz sector transducer (Aloka Prosound SSD-5500), free- handed during 10 seconds, allowing PD sonography and post processed (Tom Tec imaging systems). The technique was applied in 10 patients. Results One patient was excluded due to inadequate bone win- dow. TCCS enabled visualization of only colour coded flow of all circle of Willis vessels simultaneously in one patient and all vessels of the VBS was not possible at all. Post processing and skilled rotation 3D PD data sets enabled visualization of the one side of the Willis circle in all patients but two, where only part of one arterial segment couldn't be displayed. Visualization of the communicating arteries or collateral flow in patients with occlusive disease was good. Hemodynamic analysis in TCCS was indispensable for occlusive disease evaluation and collate- ral pathways interpretation. 3D PD enabled visualization of all three vessels of the VBS simultaneously, allowing interpretation of the BA origin (neither patient had occlusive disease of that segment). Conclusions Noncontrast 3D US enables display of one side of the Willis circle or VBS simultaneously in most patients. TCCS and hemodynamic analysis is needed for the evaluation of the occlusive disease and interpretation of the collateral pathways.

3D ultrasound ; Willis circle ; vertebrobasilar system

nije evidentirano