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To perform a study the patient is positioned within an MRI scanner which forms a strongmagnetic field around the area to be imaged. Most medical applications rely on detecting aradio frequency signal emitted by excited hydrogen atoms in the body (present in any tissue containing water molecules) using energy from an oscillating magnetic field applied at the appropriate resonant frequency. The orientation of the image is controlled by varying the main magnetic field using gradient coils. As these coils are rapidly switched on and off they create the characteristic repetitive noises of an MRI scan. The contrast between different tissues is determined by the rate at which excited atoms return.
for clabration D2O is used insted for H
