Category Archives: Functional
A 41-year-old female with history of migraine presented to the ED with acute onset of aphasia. In addition to the aphasia, there was numbness and tingling in the right arm and face. Patient demonstrated expressive aphasia and was not able to answer questions posed in the ED. Gadolinium MR perfusion images demonstrated decreased relative cerebral blood flow (top) in the left parietal/occipital lobes and increased time-to-peak (bottom) in the contralateral cerebellar hemisphere. Although crossed cerebellar diaschisis (CCD) is seen mostly on radiotracer studies (hypometabolism on PET studies), it was nicely demonstrated in our patient. CCD occurs more often after supratentorial … Continue reading >>
Does anyone know what this mass could be? It was biopsied 2 years ago and pathology reported it as “normal brain tissue”.
As you can see, the lesion is hyperintense on T2, hypointense on T1 and does not enhance. No calcifications are present and no there is no restricted diffusion .
The patient is 25 year old and has loss of short term memory and seizures.
Any input into the nature of the mass is welcome.… Continue reading >>
I will like to know if someone can help me with some doubts I have regarding ADCs.
1. I have a sample with some ADC values obtained in 1,5 T and others obtained in 3T ( same b value). Can I use the ADC values for statistics or do you think that they cannot be compared?
2. Are the ADC values obtained using a diffusion sequence the same that the ADC values obtained in a DTI sequence with 12 directions?
Thank you in advance.… Continue reading >>
Acute ischemic stroke remains the most important neurologic malady in the world. Severe strokes caused by artery occlusion are a minority of all strokes, but cause most of the poor outcomes and costs associated with stroke. Neurointerventionalists have effective therapies, but too few stroke patients undergo endovascular procedures. The reasons are multiple, but a major reason is that patients too frequently arrive beyond the traditional time windows for treatment. A way to break out of this dilemma is described in the paper recently ePublished in the AJNR (N. Janjua, A. El-Gengaihy, J. Pile-Spellman, and A.I. Qureshi Late Endovascular Revascularization in Acute Ischemic … Continue reading >>
I am upgrading the fMRI lab at our institution. Which system do you suggest to present visual paradigms, mirror over the head coil and video beam wall projection Vs binocular glasses… Continue reading >>
I have been asked by several invididuals to place more emphasis on articles that relate to the functional aspects of neuroimaging. One of these topics are the the white matter tracts. Starting later this year, AJNR will carry a bimonthly feature on the white matter tracts. Drs. Naidich and Fatterpekar from the Mount Sinai Hospital in NYC will be in charge of this feature. These short contributions will describe not only the anatomy of specific tracts, their DTI appearance but also their functional connections and the clinical symptoms produced when they are injured. I look forward to their contributions which … Continue reading >>