Although the magnetic field may be homogeneous, the positioning of a human subject in the bore of the magnet to perform imaging studies induces inhomogeneous fields. Least effect is generated when the object is cylindrical. In regions of marked contour abnormalities such as the leg to foot junction and trunk to neck or neck to head, the inhomogeneity can be so dramatic that errors in fat saturation occur that can lead to misdiagnoses.This manuscript is intended to explain the principle of magnetic susceptibility, fat saturation, and how Sat Pads help improve magnetic field homogeneity. The improved homogeneity results in higher quality MR images, improved homogeneous fat/water saturation to allow for true anatomic representation.Magnetic Resonance (MR) imaging is a modality that utilizes a magnetic field and radio-waves to interact with hydrogen atoms (protons) inside the body to create noninvasive sectional images of internal organs . The basic and most important principle upon which this technique relies is that protons will respond to a specific radio-frequency dependent upon the local magnetic field strength they experience. Therefore, to properly interact with specific protons, their local magnetic field must be homogeneous and known. When a linearly ramped.
|Number of pages
|Artificial Cells, Blood Substitutes, and Biotechnology
|Published - Jan 1994
ASJC Scopus subject areas
- Biomedical Engineering