Topics tagged with "MRI"

MRI

MRI

What is structural magnetic resonance imaging (MRI) in PTSD? The technology of structural MRI is based on the magnetisation properties of cellular protons. The application of a strong magnetic field causes the protons within cells to shift direction, which will return to their original position over time (“precession”). The rate of precession differs across tissue types (such as grey matter and white matter in the brain), which can be interpreted by specialised programs to represent a 3D image. Many mental disorders have shown brain structural changes investigated with MRI, including schizophrenia and bipolar disorder. What is the evidence for changes…
MRI

Functional magnetic resonance imaging

What is functional magnetic resonance imaging (fMRI)? fMRI measures blood flow to determine activation and deactivation of the specific brain regions associated with particular tasks. What is the evidence for fMRI findings in people with bipolar disorder? Compared to controls, moderate quality evidence finds decreased activation in adults with bipolar disorder in the inferior frontal gyrus during cognitive and emotion tasks, and during a mania phase. There were also decreases in the lingual gyrus during cognitive tasks and euthymia, and in the putamen during cognitive tasks. There were increases in activation in the medial temporal lobe, putamen, pallidum, and caudate…
MRI

Magnetic resonance imaging

What is magnetic resonance imaging (MRI)? MRI is based on the magnetisation properties of cellular protons. The application of a strong magnetic field causes the protons within cells to shift direction, which will return to their original position over time (“precession”). The rate of precession differs across tissue types (such as grey matter and white matter in the brain), which can be interpreted by specialised programs to represent a 3D image. What is the evidence for MRI findings in people with bipolar disorder? Grey matter decreases compared to controls High quality evidence shows small decreases in hippocampal subfields in people…

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