IRM de diffusion IRM de perfusion - AFIIM.COM I do NeuroRx.pdfIRM de diffusion IRM de perfusion...
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Transcript of IRM de diffusion IRM de perfusion - AFIIM.COM I do NeuroRx.pdfIRM de diffusion IRM de perfusion...
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Impossible to put the head coil due to scoliosis => 2 Flex coils around the head
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Image quality could still be decent without a head coil
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More lateral coverage for Sag 3D acquisitions. Cover the entire ears as parallelimaging may induce foldover artifact inside the brain
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Like a construction game. Chose pieces
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Thrombus appears as a filling defect on CE-mra and is strongly hypointense on T2*
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Small & cortical DVT may be better seen on SWI or raw images from CEmra
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Flow related techniques such as PC may falsely lead to a diagnosis of venousthrombosis in case of slow flow such as in th left lateral sinus
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Up : high grade glioma
Down, left : colloid cyst in the 3rd ventricule associated with hydrocephalus
Down, righ : cavernoma
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Diffuse and regular (without nodules) dural thickening
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Sphenoidal sinusitis
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Apoplexy
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Upper images : 2 broad-based dural fully enhancing lesions : meningiomas
Lower images : non enhancing lesion in T2 high-SI but not exactly the same signal as CSF on FLAIR and cisternographic T2 sequence : epidermoid cyst
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Multiple sclerosis with pontine and cerebellar peduncles active lesions.
Note that some of the supra-tentorial lesions are centered by venules on SWI imaging
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Postero-lateral medulla infarction with cervical vertebral artery dissection
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Positionning in the sagittal plane : 2 anatomical landmarks
- Median sagittal slice : pons-medulla junction
- Slightly more lateral slice : IAC is cut perpendicularly and appears as a gray disc within the black petrous bone
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Adjust the lateral obliquity in coronal plane
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Small intralabyrinthine schwannoma, very difficult to depict on cisternographicimages alone, easier to see on T1 post-gad sequence
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Atrophy with ventricular enlargment but no hippocampal involvement if small vesseldisease is isolated
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Up : old lacunar infarction
Down : microbleeds on T2* sequence. If several peripherical microbleeds present, amyloïd angiopthy may be discussed
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Hippocampus atrophy
Precuneus atrophy visible on sagittal plane
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Frontal meninioma
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Subdural hematoma
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Up : Acute stroke < 6hrs : usually no FLAIR abnomality except slow vessels in high-SI
Down : Stroke in diffusion high SI with low ADC and high FLAIR SI – usually more than6 hrs and less than 1 week
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Better vessel assessment including thrombus site, lenght with CE-MRA and SWI
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Cemra : simultaneous assessment of supraaortic arteries : useful if endovascularprocedure is done after the mri
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