scholarly journals Hemodynamic Analysis of Cerebral AVMs with 3D Phase-Contrast MR Imaging

2021 ◽  
Author(s):  
Y. Takeda ◽  
T. Kin ◽  
T. Sekine ◽  
H. Hasegawa ◽  
Y. Suzuki ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Phase Contrast ◽  
Cerebral Avms

scholarly journals Standard and cardiac-gated phase-contrast magnetic resonance imaging in the clinical course of patients with Chiari malformation Type I

2011 ◽  
Vol 31 (3) ◽  
pp. E5 ◽  
Author(s):  
Uwe Max Mauer ◽  
Andreas Gottschalk ◽  
Carolin Mueller ◽  
Linda Weselek ◽  
Ulrich Kunz ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Chiari Malformation ◽  
Phase Contrast ◽  
Foramen Magnum ◽  
Central Canal ◽  
Type I ◽  
Csf Flow ◽  
Chiari Malformation Type I ◽  
Cerebrospinal Fluid Flow ◽  
Contrast Magnetic Resonance

Object The causal treatment of Chiari malformation Type I (CM-I) consists of removing the obstruction of CSF flow at the level of the foramen magnum. Cerebrospinal fluid flow can be visualized using dynamic phase-contrast MR imaging. Because there is only a paucity of studies evaluating CSF dynamics in the region of the spinal canal on the basis of preoperative and postoperative measurements, the authors investigated the clinical usefulness of cardiacgated phase-contrast MR imaging in patients with CM-I. Methods Ninety patients with CM-I underwent preoperative MR imaging of CSF pulsation. Syringomyelia was present in 59 patients and absent in 31 patients. Phase-contrast MR imaging of the entire CNS was used to investigate 22 patients with CM-I before surgery and after a mean postoperative period of 12 months (median 12 months, range 3–33 months). In addition to the dynamic studies, absolute flow velocities, the extension of the syrinx, and tonsillar descent were also measured. Results The changes in pulsation were highly significant in the region of the (enlarged) cistern (p = 0.0005). Maximum and minimum velocities (the pulsation amplitude) increased considerably in the region where the syrinx was largest in diameter. The changes of pulsation in these patients were significant in the subarachnoid space in all spinal segments but not in the syrinx itself and in the central canal. Conclusions The demonstration of CSF flow pulsation can contribute to assessments of surgical outcomes. The results presented here, however, raise doubts about current theories on the pathogenesis of syringomyelia.

scholarly journals Age-related changes in tricuspid inflow: comparison between phase contrast MR imaging and Doppler echocardiography

2011 ◽  
Vol 13 (S1) ◽  
Author(s):  
Stephanie Clement-Guinaudeau ◽  
Emilie Bollache ◽  
Muriel Lefort ◽  
Magalie Ladouceur ◽  
Ludivine Perdrix ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Doppler Echocardiography ◽  
Phase Contrast ◽  
Age Related ◽  
Age Related Changes

Brain motion: measurement with phase-contrast MR imaging.

Radiology ◽  
1992 ◽  
Vol 185 (3) ◽  
pp. 653-660 ◽  
Author(s):  
D R Enzmann ◽  
N J Pelc
Keyword(s):  
Mr Imaging ◽  
Phase Contrast ◽  
Motion Measurement ◽  
Brain Motion

Analysis of noise in phase contrast MR imaging

1996 ◽  
Vol 23 (6) ◽  
pp. 857-869 ◽  
Author(s):  
A. H. Andersen ◽  
J. E. Kirsch
Keyword(s):  
Mr Imaging ◽  
Phase Contrast

Analysis of aqueductal cerebrospinal fluid flow after endoscopic aqueductoplasty by using cine phase-contrast magnetic resonance imaging

2000 ◽  
Vol 93 (2) ◽  
pp. 237-244 ◽  
Author(s):  
Henry W. S. Schroeder ◽  
Christiane Schweim ◽  
Klaus H. Schweim ◽  
Michael R. Gaab
Keyword(s):  
Cerebrospinal Fluid ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Healthy Volunteers ◽  
Phase Contrast ◽  
Aqueductal Stenosis ◽  
Csf Flow ◽  
Content Type ◽  
Endoscopic Aqueductoplasty ◽  
Fine Print

Object. The purpose of this prospective study was to evaluate aqueductal cerebrospinal fluid (CSF) flow after endoscopic aqueductoplasty. In all patients, preoperative magnetic resonance (MR) imaging revealed hydrocephalus caused by aqueductal stenosis and lack of aqueductal CSF flow.Methods. In 14 healthy volunteers and in eight patients with aqueductal stenosis who had undergone endoscopic aqueductoplasty, aqueductal CSF flow was investigated using cine cardiac-gated phase-contrast MR imaging. For qualitative evaluation of CSF flow, the authors used an in-plane phase-contrast sequence in the midsagittal plane. The MR images were displayed in a closed-loop cine format. Quantitative through-plane measurements were performed in the axial plane perpendicular to the aqueduct. Evaluation revealed no significant difference in aqueductal CSF flow between healthy volunteers and patients with regard to temporal parameters, CSF peak and mean velocities, mean flow, and stroke volume. All restored aqueducts have remained patent 7 to 31 months after surgery.Conclusions. Aqueductal CSF flow after endoscopic aqueductoplasty is similar to aqueductal CSF flow in healthy volunteers. The data indicate that endoscopic aqueductoplasty seems to restore physiological aqueductal CSF flow.

Portal blood flow in the presence or absence of diffuse liver disease: measurement by phase contrast MR imaging

1995 ◽  
Vol 20 (3) ◽  
pp. 197-200 ◽  
Author(s):  
N. Kashitani ◽  
S. Kimoto ◽  
M. Tsunoda ◽  
T. Ito ◽  
T. Tsuji ◽  
...  
Keyword(s):  
Blood Flow ◽  
Liver Disease ◽  
Mr Imaging ◽  
Phase Contrast ◽  
Portal Blood Flow ◽  
Portal Blood ◽  
Diffuse Liver Disease
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