bold fmri การใช้

• This approach could have potential advantages over BOLD fMRI and is the subject of current research.
• Another alternative to polygraph machines is blood oxygenated level dependent functional MRI technology ( BOLD fMRI ).
• A limitation of BOLD fMRI is its spatial resolution, as flow increase in somewhat large arteries or veins feed or drain large neuronal territories.
• This is a type of specialized brain and body scan used to map BOLD fMRI but provides contrast based on the magnitude of diffusion of water molecules in the brain.
• :: : : The abstract of the Purnell study ends with " In normal weight humans, cortical responses as assessed by BOLD fMRI to infused glucose are opposite to those of fructose.
• This approach has been proposed as an alternative to the BOLD fMRI technique and used to detect visual response to photic stimulation, motor activation by finger tapping and activations in language areas during speech processing.
• Event-related designs allow more real world testing, however, the statistical power of event related designs is inherently low, because the signal change in the BOLD fMRI signal following a single stimulus presentation is small.
• The physiological blood-flow response largely decides the temporal sensitivity, how well we can measure when neurons are active, in BOLD fMRI . The basic time resolution parameter is the sampling rate, or TR, which dictates how often a particular brain slice is excited and allowed to lose its magnetization.
• This finding has an important implication for the interpretation of BOLD fMRI data where this high baseline activity is generally ignored and response to the task is shown as independent of the baseline activity . 13 C MRS studies indicate that this approach can misjudge and even completely miss the brain activity induced by the task.
• The physiological blood-flow response largely decides the temporal sensitivity, that is how accurately we can measure when neurons are active, in BOLD fMRI . The basic time resolution parameter ( sampling time ) is designated TR; the TR dictates how often a particular brain slice is excited and allowed to lose its magnetization.
• Beneventi et al . provides supporting evidence that reading impairment observed in dyslexic subjects can be associated with general deficits in working memory . In an experiment done using BOLD fMRI to compare neurological activity before and during a reading task is administered to subjects, it was found that patients with dyslexia demonstrate categorically different neural patterns from normal individuals.