scholarly journals Intracranial Flow Velocity Quantification Using Non-Contrast Four-Dimensional Flow MRI: A Prospective Comparative Study with Transcranial Doppler Ultrasound

Diagnostics ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 23
Author(s):  
Sam-Yeol Ha ◽  
Yeonah Kang ◽  
Ho-Joon Lee ◽  
Moonjung Hwang ◽  
Jiyeon Baik ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Doppler Ultrasound ◽  
Transcranial Doppler ◽  
Strong Correlation ◽  
Three Dimensional ◽  
Transcranial Doppler Ultrasound ◽  
4D Flow Mri ◽  
4D Flow ◽  
Flow Mri

Four-dimensional (4D) flow magnetic resonance imaging (MRI) allows three-dimensional velocity encoding to measure blood flow in a single scan, regardless of the intracranial artery direction. We compared blood flow velocity quantification by non-contrast 4D flow MRI and by transcranial Doppler ultrasound (TCD), the most widely used modality for measuring velocity. Twenty-two patients underwent both TCD and non-contrast 4D flow MRI. The mean time interval between TCD and non-contrast 4D flow MRI was 0.7 days. Subsegmental velocities were measured bilaterally in the middle cerebral and basilar arteries using TCD and non-contrast 4D flow MRI. Intracranial velocity measurements using TCD and non-contrast 4D flow MRI demonstrated a strong correlation in the bilateral M1, especially at the proximal segment (right r = 0.74, left r = 0.78; all p < 0.001). Mean velocities acquired with 4D flow MRI were approximately 8 to 10% lower than those acquired with TCD according to the location of M1. Intracranial arterial flow measurements estimated using non-contrast 4D flow MRI and TCD showed strong correlation. 4D flow MRI enables simultaneous assessment of vascular morphology and quantitative hemodynamic measurement, providing three-dimensional blood flow visualization. 4D flow MRI is a clinically useful sequence with a promising role in cerebrovascular disease.

scholarly journals Efficient method for volumetric assessment of peak blood flow velocity using 4D flow MRI

2016 ◽  
Vol 44 (6) ◽  
pp. 1673-1682 ◽  
Author(s):  
Michael J. Rose ◽  
Kelly Jarvis ◽  
Varun Chowdhary ◽  
Alex J. Barker ◽  
Bradley D. Allen ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Efficient Method ◽  
Blood Flow Velocity ◽  
4D Flow Mri ◽  
4D Flow ◽  
Volumetric Assessment ◽  
Flow Mri ◽  
Peak Blood

Cerebrovascular Reactivity in Migraineurs as Measured by Transcranial Doppler

Cephalalgia ◽  
1990 ◽  
Vol 10 (2) ◽  
pp. 95-99 ◽  
Author(s):  
T Darrell Thomas ◽  
Gary J Harpold ◽  
B Todd Troost
Keyword(s):  
Blood Flow ◽  
Middle Cerebral Artery ◽  
Flow Velocity ◽  
Doppler Ultrasound ◽  
Cerebral Artery ◽  
Transcranial Doppler ◽  
Blood Flow Velocity ◽  
Transcranial Doppler Ultrasound ◽  
Cerebrovascular Reactivity ◽  
Artery Blood Flow

Transcranial Doppler ultrasound is a relatively new diagnostic modality which allows the non-invasive assessment of intracranial circulation. A total of 10 migraine patients were studied and compared to healthy controls without headaches. Migraineurs during the headache-free interval demonstrated excessive cerebrovascular reactivity to CO2, evidenced by an increase in middle cerebral artery blood flow velocity of 47% ± 15% compared to 28% ± 14% in controls ( p = 0.026). Differences between the two study groups revealed no significant decrease in middle cerebral artery blood flow velocity with hypocapnia. However, the differences between middle cerebral artery blood flow velocity during hyperventilation and CO2 inhalation were significantly different ( p = 0.004) comparing migraineurs and controls. Instability of the baseline blood flow velocities was also noted in migraineurs during the interictal period. Characteristics which may allow differentiation of migraineurs from other headache populations could possibly be obtained from transcranial Doppler ultrasound flow studies.

scholarly journals Reproducibility and interobserver variability of systolic blood flow velocity and 3D wall shear stress derived from 4D flow MRI in the healthy aorta

2015 ◽  
Vol 43 (1) ◽  
pp. 236-248 ◽  
Author(s):  
Pim van Ooij ◽  
Alexander L. Powell ◽  
Wouter V. Potters ◽  
James C. Carr ◽  
Michael Markl ◽  
...  
Keyword(s):  
Blood Flow ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Interobserver Variability ◽  
4D Flow Mri ◽  
4D Flow ◽  
Flow Mri ◽  
Wall Shear

scholarly journals Transcranial Doppler ultrasound is a diagnostic and predicting tool for movement disorders in children after hypoxic ischemic encephalopathy

2021 ◽  
Vol 4 (3) ◽  
pp. 254-259
Author(s):  
K.A. Pugolovkin ◽  
◽  
E.A. Efimova ◽  
E.A. Dombrovskaya ◽  
I.Yu. Platonova ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Doppler Ultrasound ◽  
Movement Disorders ◽  
Transcranial Doppler ◽  
Motor Skill ◽  
Blood Flow Velocity ◽  
Transcranial Doppler Ultrasound ◽  
Hypoxic Ischemic Encephalopathy ◽  
Ischemic Encephalopathy

Aim: to assess brain circulation in the regions supplied by the basilar artery (BA) in children with movement disorders and motor skill delay in the late rehabilitative period after hypoxic ischemic encephalopathy and its importance for the objectivity of clinical data and evaluation of rehabilitative effect. Patients and Methods: 28 children (mean age one year seven months) with movement disorders and motor skill delay (after hypoxic ischemic CNS lesion in the perinatal period) without lower extremity paraparesis or Willis circle abnormalities (by Doppler ultrasound) were examined. Doppler ultrasound was performed using the suboccipital approach at 3–8 months with 3–4-month intervals. The parameters of blood flow in BA, i.e., resistivity index (RI) and mean blood flow velocity (Vm), were measured. Retrospectively, children were divided into three groups based on motor skill delay severity (mild, moderate, or severe) and time for standing unaided to walking. Mean values in the groups and relative deviations (increase/decrease) from reference values in a given age group were compared. Results: motor skill delay severity and predicting time for standing unaided to walking correlated with RI and Vm. RI was a diagnostically valuable parameter whose reference values differed from motor skill delay severity. Isolated increase in Vm and normal RI were reported in children with motor skill delay 1–3 months before standing unaided to walking. This type of blood circulation is a transitional one during clinical improvement in some children. Conclusions: a set of instrumental data allow for describing motor skill delay severity depending on RI deviations from normal values in the regions supplied by BA. The sequence of brain circulation parameter changes is in line with the clinical course, e.g., RI normalization and further gradual recovery of blood flow velocity. KEYWORDS: movement disorders, motor skill delay, Transcranial Doppler ultrasound, basilar artery, resistivity index RI, mean blood flow velocity Vm. FOR CITATION: Pugolovkin K.A., Efimova E.A., Dombrovskaya E.A. et al. Transcranial Doppler ultrasound is a diagnostic and predicting tool for movement disorders in children after hypoxic ischemic encephalopathy. Russian Journal of Woman and Child Health. 2021;4(3):254–259 (in Russ.). DOI: 10.32364/2618-8430-2021-4-3-254-259.

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