Clinical MR Imaging and Physics
Produktnummer:
18fc952787b05f486f9794f737bf1a886d
Autor: | Chrysikopoulos, Haris S. |
---|---|
Themengebiete: | MR Angiography MR Physics MR imaging angiography diagnosis magnetic resonance magnetic resonance imaging magnetic resonance imaging (MRI) |
Veröffentlichungsdatum: | 20.11.2008 |
EAN: | 9783540779995 |
Sprache: | Englisch |
Seitenzahl: | 176 |
Produktart: | Kartoniert / Broschiert |
Verlag: | Springer Berlin |
Untertitel: | A Tutorial |
Produktinformationen "Clinical MR Imaging and Physics"
Keywords Spin › Electromagnetic radiation › Resonance › Nucleus › Hydrogen › Proton › Certain atomic nuclei possess inherent magnetic Let us summarize the MRI procedure. Te patient properties called spin, and can interact with electro- is placed in a magnetic feld and becomes temporarily 1 magnetic (EM) radiation through a process called magnetized. Resonance is achieved through the - resonance. When such nuclei absorb EM energy they plication of specifc pulses of EM radiation, which is proceed to an excited, unstable confguration. Upon absorbed by the patient. Subsequently, the excess - return to equilibrium, the excess energy is released, ergy is liberated and measured. Te captured signal producing the MR signal. Tese processes are not is processed by a computer and converted to a gray random, but obey predefned rules. scale (MR) image. Te simplest nucleus is that of hydrogen (H), con- Why do we need to place the patient in a m- sisting of only one particle, a proton. Because of its net? Because the earth’s magnetic feld is too weak to abundance in humans and its strong MR signal, H be clinically useful; it varies from 0. 3–0. 7 Gauss (G). is the most useful nucleus for clinical MRI. Tus, foC r urrent clinical MR systems operate at low, mid or our purposes, MRI refers to MRI of hydrogen, and for h igh feld strength ranging from 0. 1 to 3.

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