scholarly journals Signal processing techniques for operator independent Doppler ultrasound : potential for use in transcranial Doppler ultrasound

2021 ◽  
Author(s):  
Benjamin Lee
Keyword(s):  
Doppler Ultrasound ◽  
Power Doppler ◽  
Transcranial Doppler Ultrasound ◽  
Vascular Structure ◽  
Ultrasound Monitoring ◽  
3D Power Doppler ◽  
Doppler Angle ◽  
Flow Phantom ◽  
Pulsed Wave Doppler

2D Doppler ultrasound can be used for continuous monitoring of vasospasm. However, the use of Doppler ultrasound suffers from operator dependence requiring a skilled ultrasonographer to make Doppler angle corrections. The aim of the research is to minimize the need of dedicated ultrasonographers for Doppler ultrasound monitoring of cerebral vasospasms. In this thesis, three studies including a steady flow phantom, pulsatile flow phantom and in vivo human internal carotid artery (ICA) were completed with the use of 3D Doppler ultrasound. The 3D vascular structure of the phantom and ICA were obtained using binary skeletonization from 3D power Doppler images. The vascular structure was used in combination with angle independent pulsed-wave Doppler to reconstruct the temporal blood velocity profiles at various parts of the vasculature. The results indicate that Doppler angle corrections can be minimized with the use of 3D Doppler ultrasound, and operator independent monitoring of blood flow is possible.

scholarly journals Signal processing techniques for operator independent Doppler ultrasound : potential for use in transcranial Doppler ultrasound

2021 ◽  
Author(s):  
Benjamin Lee
Keyword(s):  
Doppler Ultrasound ◽  
Power Doppler ◽  
Transcranial Doppler Ultrasound ◽  
Vascular Structure ◽  
Ultrasound Monitoring ◽  
3D Power Doppler ◽  
Doppler Angle ◽  
Flow Phantom ◽  
Pulsed Wave Doppler

2D Doppler ultrasound can be used for continuous monitoring of vasospasm. However, the use of Doppler ultrasound suffers from operator dependence requiring a skilled ultrasonographer to make Doppler angle corrections. The aim of the research is to minimize the need of dedicated ultrasonographers for Doppler ultrasound monitoring of cerebral vasospasms. In this thesis, three studies including a steady flow phantom, pulsatile flow phantom and in vivo human internal carotid artery (ICA) were completed with the use of 3D Doppler ultrasound. The 3D vascular structure of the phantom and ICA were obtained using binary skeletonization from 3D power Doppler images. The vascular structure was used in combination with angle independent pulsed-wave Doppler to reconstruct the temporal blood velocity profiles at various parts of the vasculature. The results indicate that Doppler angle corrections can be minimized with the use of 3D Doppler ultrasound, and operator independent monitoring of blood flow is possible.

3D-Power Doppler Ultrasound of Breast Lesions with a Microbubble Contrast Agent

2002 ◽  
Vol 9 (2) ◽  
pp. S384-S385 ◽  
Author(s):  
C.R Krestan ◽  
C Riedl ◽  
M Memarsadeghi ◽  
M Rudas ◽  
G Pfarl ◽  
...  
Keyword(s):  
Contrast Agent ◽  
Doppler Ultrasound ◽  
Power Doppler ◽  
Breast Lesions ◽  
Power Doppler Ultrasound ◽  
Microbubble Contrast Agent ◽  
3D Power Doppler

scholarly journals P43.05: Assessment of benign ovarian masses with the use of 3D and 3D power Doppler ultrasound

2007 ◽  
Vol 30 (4) ◽  
pp. 615-615
Author(s):  
N. Vrachnis ◽  
A. Alamanou ◽  
Z. Iliodromiti ◽  
A. Pavlaki ◽  
D. Botsis ◽  
...  
Keyword(s):  
Doppler Ultrasound ◽  
Power Doppler ◽  
Power Doppler Ultrasound ◽  
3D Power Doppler ◽  
Ovarian Masses

scholarly journals Three-Dimensional Power Doppler Analysis of Cerebral Circulation in Normal and Growth-Restricted Fetuses

2009 ◽  
Vol 29 (9) ◽  
pp. 1609-1618 ◽  
Author(s):  
Jose L Bartha ◽  
Eva M Moya ◽  
Blas Hervías-Vivancos
Keyword(s):  
Doppler Ultrasound ◽  
Cerebral Circulation ◽  
Pulsatility Index ◽  
Power Doppler ◽  
Three Dimensional ◽  
Flow Index ◽  
Power Doppler Ultrasound ◽  
3D Power Doppler ◽  
Doppler Indices ◽  
Vascularization Index

The objective of the present study was to evaluate fetal cerebral circulation by using three-dimensional (3D) power Doppler ultrasound in normal and growth-restricted fetuses. A total of 100 normal grown fetuses were compared with other 25 with growth restriction (FGR). Three-dimensional power Doppler ultrasound was used to assess fetal cerebral 3D vascular indices: vascularization index, flow index (FI), and vascularization flow index (VFI). Both FI and VFI correlated positively with gestational age. On average, all the 3D vascular indices were increased in fetuses with FGR. The proportion of fetuses detected as having hemodynamic redistribution was higher when using 3D power Doppler indices than by means of the middle cerebral artery pulsatility index (52% versus 20%, P = 0.002). In conclusion, two of the three indices increased during gestation. All the fetal cerebral 3D vascular indices are increased in fetuses with FGR. In these fetuses, there were more cases suggesting hemodynamic redistribution than expected by conventional Doppler studies.

The use of 3D power doppler ultrasound in the quantification of blood vessels in uterine fibroids: Feasibility and reproducibility

2014 ◽  
Vol 43 (3) ◽  
pp. 171-178 ◽  
Author(s):  
Lotte L. Nieuwenhuis ◽  
Heleen E. Betjes ◽  
Wouter J.K. Hehenkamp ◽  
Martijn W. Heymans ◽  
Hans A.M. Brolmann ◽  
...  
Keyword(s):  
Blood Vessels ◽  
Doppler Ultrasound ◽  
Power Doppler ◽  
Uterine Fibroids ◽  
Power Doppler Ultrasound ◽  
3D Power Doppler

scholarly journals To Doppler or not to Doppler

2015 ◽  
Vol 64 (2) ◽  
pp. 84-91
Author(s):  
William A Goh ◽  
Zalud Ivica
Keyword(s):  
Doppler Ultrasound ◽  
New Technologies ◽  
Rapid Development ◽  
Power Doppler ◽  
Clinical Applications ◽  
Growth Restriction ◽  
Ductus Venosus ◽  
4D Ultrasound ◽  
Doppler Ultrasound Imaging ◽  
3D Power Doppler

This review aims to provide the reader with an update on the present and potential clinical applications in Doppler ultrasound in perinatal medicine. Umbilical artery Doppler plays an important role in the management of intrauterine growth restriction (IUGR) and preeclampsia and aids in twin-to-twin transfusion syndrome management while notching in the waveform is a predictor of umbilical cord abnormalities. Middle cerebral artery Doppler reliably detects fetal anemia and may be useful in the assessment of IUGR as well. Abnormal uterine artery Doppler may play a role in predicting growth restriction, hypertensive disorders of pregnancy and preterm delivery. Abnormal ductus venosus waveforms can also be used to predict adverse fetal outcome and may allow for better timing of delivery while umbilical venous pulsations may be a sensitive marker for fetal heart failure in hydropic pregnancies. 3D power Doppler allows better small vessel visualization that is not affected by angle of insonation and has been used to diagnose placental and cord abnormalities. Significant improvements have recently occurred, improving the visualization and evaluation of placental vascularity, resulting from enhancements in delineation of tissue detail through electronic compounding and harmonics, as well as enhancements in signal processing of frequency- and/ or amplitude-based color Doppler ultrasound. Spatial representation of vascularity can be improved by utilizing 3D processing. Greater sensitivity of 3D Doppler ultrasound to macro- and microvascular flow has provided improved anatomic and physiologic assessment throughout pregnancy. The rapid development of these new ultrasound techniques will continue to enlarge the scope of clinical applications in placental studies. As clinical experience with these new technologies increase and as the technology improves further, it is reasonable to expect that 3D Doppler and 4D ultrasound will be complementary addition to well established 2D Doppler ultrasound imaging.

Study of the Vascularity of Uterine Septum Using Three Dimensional Power Doppler Ultrasound

QJM ◽  
2020 ◽  
Vol 113 (Supplement_1) ◽  
Author(s):  
M I M Amer ◽  
N E Hassan ◽  
M E Ahmed ◽  
H M M Elnaggar
Keyword(s):  
Doppler Ultrasound ◽  
Power Doppler ◽  
Adhesion Formation ◽  
Recurrent Abortion ◽  
Power Doppler Ultrasound ◽  
Septate Uterus ◽  
3D Power Doppler ◽  
Uterine Anomalies ◽  
Significant Difference ◽  
Uterine Septum

Abstract Background Uterine anomalies are a relatively common congenital abnormality, with uterine septum being the most common. This is even truer in patients with recurrent pregnancy loss, in whom rates of uterine abnormalities may approach 15% to 27%. Historically, the uterine septum has been approached via laparotomy through either a Tompkins or Jones procedure. These successful, but highly morbid, procedures require laparotomy with significant hospital stays, subsequent cesarean delivery, and have carried a high risk of adhesion formation. More recently, this surgery has been supplanted by hysteroscopy or other minimally invasive methodologies. Objective To assess the relation between the vascularity of uterine septum and obstetric performance with Transvaginal 3D Power Doppler Ultrasound. Patients and Methods Early Cancer Detection Unit and Ultrasound and Fetal special care Unit in Ain Shams University Maternity Hospital (ASUMH). Recruitment took place between May 2017 and November 2018. Cross-sectional study. The study included 30 cases of women with uterine septum. Intervention: Transvaginal 3D power Doppler ultrasound was done to all cases with septal volume and vascularity assessment using VOCAL system and Histogram facility. The study included 30 patients with septate uterus, twelve of them suffered from 1ry infertility while the other eighteen suffered from recurrent abortion. Results There was statistical significant difference between the two groups regarding vascularity (VI, FI, and VFI) of septum (P < 0.05). Conclusion The vascularity of septate uterus is variable. The power Doppler indices shows that septate uterus in cases with recurrent abortion is highly vascular while in cases with 1ry infertility shows low vascularity. Highly vascular septum may be a site of implantation which may be a cause of recurrent abortion thus; excision of the septum may help prevent recurrent abortion, while low vascular septum may prevent implantation which may be a cause of infertility thus; incision of the septum may help in treatment of infertility. Correlation with histopathologic features of septum may be required to decide the best management of the septum.

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