Magnetic Resonance Imaging (MRI) Practice Test

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The unit of measurement for the magnetic field surrounding the MR scanner is expressed in which unit?

Tesla
Gauss
Hertz
Volts

The correct answer is: Gauss

The correct unit of measurement for the magnetic field surrounding the MRI scanner is the Tesla. The Tesla is the standard unit used in the International System of Units (SI) to measure magnetic flux density, which describes the strength and direction of a magnetic field. One Tesla is equivalent to 10,000 Gauss. While Gauss is also used to measure magnetic fields, particularly in less technical contexts or in older literature, it is not the primary unit for MRI applications nowadays. The use of Hertz is related to frequency, often in the context of radiofrequency pulses used in MRI but does not measure magnetic fields. Volts are units of electric potential and are not relevant to describing magnetic fields in MRI settings. Understanding that the MRI scanner primarily measures its magnetic field in Teslas highlights its capability to produce high magnetic fields essential for imaging, which is critical for both the quality of the images obtained and the functioning of the scanner itself.