Magnetic Resonance Imaging (MRI) Practice Test

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Magnetic field inhomogeneity is typically expressed in which units?

Decibels
Parts per million
Gauss
Tesla

The correct answer is: Parts per million

Magnetic field inhomogeneity is generally expressed in parts per million (ppm) because this unit provides a clear indication of the relative variations in the strength of the magnetic field across a specified volume. In an MRI context, ppm allows for the representation of small variations in field strength while providing a scale that is easy to interpret in relation to the overall field strength. This is critical in ensuring accurate imaging, as inhomogeneities can affect the quality and clarity of MRI scans. Using parts per million helps radiologists and technicians to assess how much deviation exists in the magnetic field, which is essential for diagnosing potential issues with the MRI system and improving image quality. Therefore, ppm is the preferred unit for denoting magnetic field inhomogeneities and remains a standard in the field of MRI practices.