A) EEG
B) CT scanning
C) NMR scanning
D) PET scanning
Correct Answer: C
Solution :
NMRI (Nuclear Magnetic Resonance Imaging) is based on magnetic resonance. It is the selective, absorption of very high frequency, radio waves by certain atomic nuclei that are subjected to strong stationary magnetic field. It was first observed by Bloch and Purcell. It is used to measure nuclear magnetic moments, the characteristics magnetic behaviour, of specific nuclei. It thus provides information about the molecular structure of various solids and liquids. EEG (Electro Encephalo Graph) is a chart of the electric impulse made by the brain cells a picked up by electrodes placed on the sale. The brain waves received are called \[\alpha ,\,\,\beta ,\,\,\,\delta \]and \[\theta \] according to the frequency they produced. CT Scanning (Computed Tomographic Scanning) was developed by Godfrey Hounsfield in 1972. Also known as Computed Tomography (CT) or Computerised Axial Tomography (CAT). It is used to produce 2-3 dimensional (3D) clear cross-sectional image of an area. It can be used for imaging the whole body or any part of the body. It can obtain scans in seconds and is used to identify various fluids and lesions like tumours, absosses, ruptures of organs or accumulation of fluid etc. PET Scanning (Positron Emission Tomographic Scanning) was discovered by Loies Sokoloff in 1985. It is used in diagnosis and biomedical research. In this technique, positron (positively charged electron) emitting radio-isotopes like \[^{11}C,{{\,}^{13}}N,{{\,}^{15}}O\] and \[^{18}F\] are used. It is mainly used for the measurement of regional cerebral blood volume, blood flow, metabolic rate for glucose and oxygen in humans. It is also used to study epilepsy, Schizophrenia, Parkinson disease and drug addiction.
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