Diffusion tensor imaging (DTI) and proton magnetic resonance spectroscopy (1H MRS) in schizophrenic subjects and normal controls
| Autor: | Sarah McConnell, Ian Marshall, Stephen M. Lawrie, Mark E. Bastin, David G. Cunningham-Owens, R.M. Steel, Jonathan J.K. Best, Eve C. Johnstone |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Adult
Male Psychosis Magnetic Resonance Spectroscopy Neuroscience (miscellaneous) Aspartate N-acetyltransferase Prefrontal Cortex behavioral disciplines and activities Diffusion Anisotropy Functional Laterality Temporal lobe White matter Nuclear magnetic resonance mental disorders medicine Humans Radiology Nuclear Medicine and imaging Neurons Aspartic Acid medicine.diagnostic_test Chemistry business.industry Brain Magnetic resonance imaging medicine.disease Temporal Lobe Psychiatry and Mental health medicine.anatomical_structure nervous system Frontal lobe Schizophrenia Anisotropy Female Protons Nuclear medicine business Diffusion MRI |
| Zdroj: | Psychiatry research. 106(3) |
| ISSN: | 0165-1781 |
| Popis: | Several proton magnetic resonance spectroscopy (1H MRS) studies in schizophrenia have found reduced N-acetyl aspartate (NAA) concentrations in pre-frontal and temporal regions of the brain. Reductions in NAA may reflect abnormalities of neuronal structure (e.g. reduced neuronal density or viability) or abnormalities of neuronal function. Diffusion tensor imaging (DTI) measures diffusion anisotropy, an indicator of the structural integrity of a neuronal tract. Both techniques were used to examine the anatomical basis of pre-frontal dysfunction in schizophrenia. Ten patients with DSM-IV schizophrenia were compared with 10 healthy controls. 1H MRS and DTI were performed on a clinical MR system and analysed with a region of interest approach. NAA concentrations and diffusion anisotropy were measured in the same pre-frontal white matter region. Diffusion anisotropy was also measured in a control region (occipital white matter). 1H MRS revealed non-significant but consistently reduced NAA concentrations (by 10-15%) in the pre-frontal white matter in schizophrenic subjects. Diffusion anisotropy measures revealed no such differences between schizophrenics and controls. It is concluded that the abnormalities of 'connectivity' reported in brain-imaging studies of schizophrenia may not be attributable to structural abnormalities of white matter and that reduced NAA in the pre-frontal white matter may reflect abnormal function of structurally intact neurons. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect