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MRI and CT in Traumatic Brain Injury
Murray A. Solomon, M.D. InSight - Los Gatos MRI
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MRI and CT in Traumatic Brain InjuryIs There Still a Roll for Plain X-Rays in the Evaluation of TBI
Patients?
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MRI and CT in Traumatic Brain Injury
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MRI and CT in Traumatic Brain Injury
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MRI and CT in Traumatic Brain Injury
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MRI and CT in Traumatic Brain Injury
CT Scanning in TBI Patients
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MRI and CT in Traumatic Brain Injury
Who Should Get a CT Scan?
Canadian CT Protocol
New Orleans CT Protocol
NICE UK CT Protocol
Neurosurgery Consensus 2017
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+ 48 Hours
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Bone Window
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MRI and CT in Traumatic Brain Injury
What Can You See with a CT Scan in TBI Patients ?
Skull Fractures
Brain Contusions
Acute Brain Hemorrhage
Extra-Axial Hemorrhage
Mass Effect/Midline Shift
Brain Herniations
Foreign Bodies
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Skull Fractures with Associated Hemorrhage
MRI and CT in Traumatic Brain Injury
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Bone Window Soft Tissue Window
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MRI and CT in Traumatic Brain Injury
Soft Tissue Window
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MRI and CT in Traumatic Brain Injury
Soft Tissue Window Bone Window
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Bone WindowSoft Tissue Window
MRI and CT in Traumatic Brain Injury
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MRI and CT in Traumatic Brain InjurySoft Tissue Window Bone Window
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Epidural vs. Subdural Hematoma
MRI and CT in Traumatic Brain Injury
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Lentiform Crescentic
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Skull Base Fractures
MRI and CT in Traumatic Brain Injury
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MRI and CT in Traumatic Brain Injury
Bone Window
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Bone Window
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Diffuse Axonal Injury (DAI)
• Due to acceleration/deceleration of the white matter + hypoxia
• Patients have severe LOC at impact
• Grade 1: axonal damage in WM only - 67%
• Grade 2: WM + corpus callosum (posterior > anterior) - 21%
• Grade 3: WM + CC + brainstem - 12%
MRI and CT in Traumatic Brain Injury
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Diffuse Axonal Injury (DAI)
• Rarely detected on CT ( 20% of DAI lesions are hemorrhagic)
• MRI: T1, T2, DWI, T2 GRE, SWI
MRI and CT in Traumatic Brain Injury
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MRI and CT in Traumatic Brain Injury
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MRI in TBI Patients
MRI and CT in Traumatic Brain Injury
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MRI in TBI Patients
1983• T1W Images• PD/T2W Images
2019• T1W Images• PD/T2W Images• Diffusion Weighted
Images• T2 FLAIR Images• T1 FLAIR Images• GRE/SWI• DTI/FiberTracking• NeuroQuant• Arterial Spin Labeling• MR Angiography
MRI and CT in Traumatic Brain Injury
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What does MRI add to CT in TBI?
MRI and CT in Traumatic Brain Injury
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SWI
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CT GE GE
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Diffusion Weighted Imaging (DWI) in TBI
MRI and CT in Traumatic Brain Injury
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SWI vs. GRE
SW is 3-4x more sensitive than GRE for the detection of susceptibility
effects.
MRI and CT in Traumatic Brain Injury
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1.5 SWI 3T
MRI and CT in Traumatic Brain Injury
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38Y Male s/p Closed Head Trauma (Motorcycle Accident)
Insomnia, Altered Circadian Rhythms
MRI and CT in Traumatic Brain Injury
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T1 FLAIR T2W
3T MRI Images
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T1 FLAIR T2W
3T MRI Images
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T2W SWI
3T MRI Images
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T2W SWI
3T MRI Images
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MRI and CT in Traumatic Brain Injury
3T DTI/FiberTracking in TBI
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Why do we need DTI/FiberTracking?
Conventional MRI cannot reveal detailed anatomy of the white matter. On routine MRI scans the white matter looks homogeneous because it is homogeneous with respect to chemical composition (water concentration, T1 and T2 values). Diffusion Tensor Imaging (DTI) can generate contrasts that are sensitive to fiber orientation.
MRI and CT in Traumatic Brain Injury
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The diffusion of water molecules in biologic tissues can be measured using MR gradients and diffusion weighted
sequences. Water molecules are “tagged” with a very short gradient
pulse. The magnetization and phase of water molecules can measured and used
for localization and therefore the determination of diffusion.
MRI and CT in Traumatic Brain Injury
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Diffusion perpendicular to axon bundles is hindered by axonal cell membranes and myelin sheaths whereas it is unrestricted along them. Within axons, the diffusion of water will be greater parallel to the fibers.
When diffusion exhibits a preferential direction, it is termed anisotropic.
Fractional Anisotropy (FA) is a measure of the degree of anisotropy.
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MRI and CT in Traumatic Brain Injury
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Courtesy of Tim Roberts & Mike Moseley
Anisotropic Diffusion in Celery
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Fractional Anisotropy (FA)
A measure of the degree of anisotropy in a tensor model of diffusion at a given voxel. FA values are bounded between zero (a perfect sphere) and one (an infinitely long cigar shape)
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Modeling Tracts from Seed Points
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The “tracts” created with fiber tracking are mathematical analogs (stream tubules) of the WM tracts representing fractional anisotropy values and not actual WM fibers or bundles.
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54Y F M.D. Anesthesiologist involved in a severe MVA with head trauma. She was airlifted by helicopter and
hospitalized at Stanford.
MRI and CT in Traumatic Brain Injury
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Mentation Changes after a Severe MVA
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Severe MVA Age MatchedNormal
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54YF Fell Down Stairs 1.5M Prior to MRI Scan. Hit Head “Hard” Several
Times Resulting in a Concussion
“Post-concussive Syndrome” with HA, Memory Loss, Difficulty with
Concentration
Severe MVA MRI and CT in Traumatic Brain Injury
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Severe MVA MRI and CT in Traumatic Brain Injury
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Normal
Patient
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Corticospinal Tract (CST)
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Corticospinal Tract (CST)
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Left Corticospinal Tract
L R
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Callosum Forceps Major
L R
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Left Arcuate Fasiculus
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Brain Segmentation
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3T 3D Volume ImagingT1W 3D TFE with Sense
• TR 7
• TE 3.2
• 1.2mm sagittal slices, no gap
• 255 x 256 matrix
• Acquisition Time 9:13
• 180 slices (160 usable slices)
Pulse Sequence Chosen to Provide Thin Slices and Good GM-WM Discrimination
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NeuroQuant Brain Volumetrics Reveals Significant Post-Traumatic Volume Loss of the Left Forebrain, Left Cortical Gray Matter, Left Hippocampus/Amygdala and Basal Ganglia on the Left Side.
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MRI and CT in Traumatic Brain Injury
Arterial Spin Labeling
ASL
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What is ASL?
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What is ASL?
ASL is an MRI method that enables the measurement of tissue perfusion (CBF) without the use of exogenous contrast agents by magnetically tagging (nulling the signal of) water in inflowing blood. Recent advances in pulse sequence design and the availability of 3T scanners have resulted in increased clinical adoption of ASL.
Cerebral Blood Flow (CBF) can be defined as the steady state delivery of blood to the tissue capillary bed. It is measured in ml/min/100g
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1% Signal Difference Quantitative CBF
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How Long Does It Take?
3T
1.5T
Acq time: 9 min.
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Displaying ASL Data
Black and White
Colorized and Quantitative
Colorized Superimposed on T1W Images
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Black and White Colorized/Quantitative Superimposed on T1W
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Mr. XX Accident History
• Mr. XX is a 41YM, with a history of three prior concussions from which he completely recovered, who was involved in a motor vehicle accident suffering head trauma on 5/3/2017.
• Since the accident, Mr. XX has been experiencing memory difficulties including trouble with name recall, difficulty concentrating, and attention and focus impairment.
• Mr. XX’s symptoms are interfering with completing tasks and performance. He has been diagnosed with post concussive syndrome.
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Mr. XX MRI of the Brain 3/7/19
LR
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Mr. XX MRI of the Brain 3/7/19
LR
Asymmetric Decreased Cortical Perfusion Right Frontal Lobe
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Mr. XX MRI of the Brain 3/7/19
Asymmetric Decreased Cortical Perfusion Right Frontal Lobe
LR
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Robert Thompson MRI of the Brain 3/7/19
Asymmetric Decreased Cortical Perfusion Right Frontal Lobe
LR
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MRI and CT in Traumatic Brain Injury
Quiz
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What is the most sensitive sequence for
detecting postraumatic “microbleeds”?
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What is the most sensitive sequence for
detecting postraumatic “microbleeds”?
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