Magnetic resonance imaging brain scans

White matter hyperintesities in magnetic resonance imaging (MRI) scans reflecting cerebrovascnlar damage and brain hypoperfusion are more severe in ACE-D/D subjects (638). Association of ACE-D/D with vascular dementia has also been reported (615,639), although in some stndies no association of ACE-I/D indel variant with vascnlar dementia was fonnd (640). 

A colored Magnetic Resonance Imaging (MRI) scan through a human head, showing a healthy brain in side view. 

Computerized tomography (CT) or magnetic resonance imaging (MRI) scans of the brain and orbit will provide structural information, especially for patients with ophthalmoplegia. 

Functional magnetic resonance imaging (fMRI) scanning to visualize brain activity relies primarily on the blood oxygen level dependent (BOLD) signal, an indirect measurement of cerebral blood flow associated with neuronal activity. In a prospective study of fMRI, 14 children were randomized to propofol 1 mg/kg by bolus injection followed either by propofol 4 mg/kg/hour or by midazolam 0.6 mg/kg/hour [80 ]. There were no differences in MRI time, and all studies were completed without movement or adverse events. The children in both groups required further boluses of sedation, and there were no differences in recovery time. Midazolam temporally affected neuronal activity and vascular response leading to a delay in functional response whereas propofol produced a similar activation pattern to non-sedated adults. 

All patients should have a brain computed tomography scan or magnetic resonance imaging scan to differentiate an ischemic stroke from a hemorrhagic stroke, as the treatment... 

Brain imaging magnetic resonance imaging and functional scan alternative computed tomography scan, positron emission tomography scan... 

Q.3.4 In modern MRI (magnetic resonance imaging) and SPECT (single photon emission computerized tomography) scans, the instruments measure the amount of blood flowing to a specific area of the brain (SPECT) or the amount of oxygen extracted from blood (the BOLD signal in functional MRI) in order to assess the intellectual use of that part of the brain. 

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