Use of high-performance ADC creates a new magnetic resonance imaging of the send/receive architecture (1)

Summary: this article discusses magnetic resonance imaging (MRI) system works, the systematic use of hydrogen atoms in the magnetic field of the movement to form a clear medical images.

The article describes a typical magnetic field type and current high-resolution MRI system relies on superconducting magnets. This article also discusses appropriate arrange gradient coil formation process of 3D image and they and the interaction between the RF signal, MRI System block diagram.

Overview

Magnetic resonance imaging (MRI) system to provide a clear image of human tissue, System testing and treatment of hydrogen atoms in strong magnetic field resonance magnetic excitation in pulse fired the generated signal.

Hydrogen nuclei spin campaign determines its own intrinsic magnetic moment, in strong magnetic field, the hydrogen atoms are aligned.

Simplicity, you can put a static magnetic field of the hydrogen atom as a tensioning rope. Nucleus has a resonance frequency or "Larmor frequency", depending on local magnetic field strength. Like a rope under tension in external resonance occurs. In a typical 1.5T MRI magnetic field, the resonance frequency of the hydrogen atom to 64MHz.

Appropriate magnetic resonance excitation or RF Pulse excitation (frequency equal to hydrogen nuclei resonance frequency) to force the nuclear magnetic moment some or all of the effects of magnetic field is offset to the vertical plane.

Stop motivation, nuclear magnetic moment will be restored to the condition of a static magnetic field. Atomic nucleus in rearranging of release energy in the process, the resonance frequency (depending on field strength) of RF signals, MRI imaging system on the signal to be detected and form an image.

MRI imaging system block diagram