The association between the pulse pressure gradient at the cranio-cervical junction derived from phase-contrast magnetic resonance imaging and invasively measured pulsatile intracranial pressure in symptomatic patients with Chiari malformation type 1

2016 ◽  
Vol 158 (12) ◽  
pp. 2295-2304 ◽  
Author(s):  
Radek Frič ◽  
Erika Kristina Lindstrøm ◽  
Geir Andre Ringstad ◽  
Kent-André Mardal ◽  
Per Kristian Eide
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Intracranial Pressure ◽  
Pulse Pressure ◽  
Chiari Malformation ◽  
Phase Contrast ◽  
Resonance Imaging ◽  
Contrast Magnetic Resonance ◽  
Chiari Malformation Type 1

Phase-contrast MRI Measurement of Systolic Cerebrospinal Fluid Peak Velocity (CSFVPeak) in the Aqueduct of Sylvius

1999 ◽  
Vol 90 (6) ◽  
pp. 1546-1550. ◽  
Author(s):  
Christian Kolbitsch ◽  
Michael Schocke ◽  
Ingo H. Lorenz ◽  
Christian Kremser ◽  
Fritz Zschiegner ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Cerebrospinal Fluid ◽  
Magnetic Resonance ◽  
Intracranial Pressure ◽  
Phase Contrast ◽  
Peak Velocity ◽  
Resonance Imaging ◽  
Phase Contrast Magnetic Resonance ◽  
Aqueduct Of Sylvius ◽  
Contrast Magnetic Resonance

Background Cerebrospinal fluid (CSF) outflow to intra- and extracranial subarachnoid spaces caused by arterial inflow to the brain predominantly compensates systolic increases in cerebral blood volume. Phase-contrast magnetic resonance imaging is a new tool for noninvasive assessment of CSF displacement by measuring CSF peak velocity (CSFV(Peak)). The authors tested this new tool in an experimental human model of increased intracranial pressure and reduced cerebral capacity by means of continuous positive airway pressure (CPAP) breathing. Methods The authors investigated systolic CSFV(Peak) in the aqueduct of Sylvius in 11 awake, normocapnic (end-tidal carbon dioxide [ET(CO2)] = 40 mmHg) volunteers without CPAP and at two different CPAP levels (6 and 12 cm H2O) by means of electroencephalography-gated phase-contrast magnetic resonance imaging. Results Administration of 6 cm H2O CPAP did not change systolic CSFV(Peak) (-4.9+/-2.8 cm/s vs. control: -5.1+/-2.7 cm/s), whereas 12 cm H2O CPAP significantly reduced systolic CSFV(Peak) (-4.0+/-1.8 cm/s vs. control: -5.1+/-2.7 cm/s; P < 0.05). Conclusions These findings in awake volunteers show that monitoring CSFV(Peak) in the aqueduct of Sylvius is a sensitive method for detecting even minor impairment of cerebral capacity caused by experimentally induced increases in intracranial pressure.

scholarly journals Non-invasive assessment of pulsatile intracranial pressure with phase-contrast magnetic resonance imaging

PLoS ONE ◽  
2017 ◽  
Vol 12 (11) ◽  
pp. e0188896 ◽  
Author(s):  
Geir Ringstad ◽  
Erika Kristina Lindstrøm ◽  
Svein Are Sirirud Vatnehol ◽  
Kent-André Mardal ◽  
Kyrre Eeg Emblem ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Intracranial Pressure ◽  
Phase Contrast ◽  
Resonance Imaging ◽  
Non Invasive ◽  
Contrast Magnetic Resonance Imaging ◽  
Phase Contrast Magnetic Resonance ◽  
Contrast Magnetic Resonance

In Vivo Tracking of the Human Patella Using Cine Phase Contrast Magnetic Resonance Imaging

1999 ◽  
Vol 121 (6) ◽  
pp. 650-656 ◽  
Author(s):  
F. T. Sheehan ◽  
F. E. Zajac ◽  
J. E. Drace
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Knee Joint ◽  
Phase Contrast ◽  
Three Dimensional ◽  
Resonance Imaging ◽  
Contrast Magnetic Resonance ◽  
Knee Joint Kinematics ◽  
Cine Phase Contrast

Improper patellar tracking is often considered to be the cause of patellar-femoral pain. Unfortunately, our knowledge of patellar-femoral-tibial (knee) joint kinematics is severely limited due to a lack of three-dimensional, noninvasive, in vivo measurement techniques. This study presents the first large-scale, dynamic, three-dimensional, noninvasive, in vivo study of nonimpaired knee joint kinematics during volitional leg extensions. Cine-phase contrast magnetic resonance imaging was used to measure the velocity profiles of the patella, femur, and tibia in 18 unimpaired knees during leg extensions, resisted by a 34 N weight. Bone displacements were calculated through integration and then converted into three-dimensional orientation angles. We found that the patella displaced laterally, superiorly, and anteriorly as the knee extended. Further, patellar flexion lagged knee flexion, patellar tilt was variable, and patellar rotation was fairly constant throughout extension.

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