Medicina: Neuropsicologia cognitiva
| English |
| magnetic resonance imaging |
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| Attestation |
3
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| Part of speech |
Noun phrase
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| Variant |
MRI
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| Definition |
A computerized image technique that employs strong magnetic fields and specific radio frequency pulses that excite protons to emit electromagnetic signals.
A computerized image technique that employs strong magnetic fields and specific radio frequency pulses that excite protons to emit electromagnetic signals. The information gained from an MRI image depends on the relaxation time, or the time required for protons to return to a resisting state after the magnetic pulse is turned off. Because different tissue types have differing relaxation times, pulse sequences can be designed to enhance specific aspects of the image. T1, T2, and proton density are designation for tissue-specific relaxation properties.
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| Definition source |
Loring D.W. 1999
Loring D.W. 1999
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| Context |
Figure 14.2, a CT scan obtained on the day of injury, shows an area of increased density consistent with an intracerebral hematoma. Smaller lesions, such as hemorrhagic contusions, are also appreciated by CT. Although magnetic resonance imaging can detect intracranial lesions not seen on CT, it frequently requires a longer scanning interval and is more sensitive to artifact produced by the patient´s movement. Moreover, bringing conventional life support equipment into a magnetic field can pose problems.
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| Context source |
Paradis 1993
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| Figure source |
www.tera.it/mostra/
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| Subject field |
Aphasia
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| Sub-field (level 1) |
Aphasiology
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| Sub-field (level 2) |
Clinical neuropsychology
Cognitive neuropsychology
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| Sub-field (level 3) |
Diagnosis-Neuroimaging
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| Generic concept |
Neuroimaging
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| Related concept |
Positron emission tomography, CT
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| it |
Risonanza magnetica
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| Reliability code |
3
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