MR Physics Simulations

Numerical Simulations of MR Imaging

In Magnetic Resonance Imaging (MRI) a variety of magnetic fields are applied to the human body to manipulate the hydrogen nuclei throughout the body. These fields interact with the body in a variety of ways, producing both the desired signal and favorable image contrast, but also side effects including image distortions and heating of tissues.

We develop a variety of numerical methods and tools considering anatomical models of the human body in the MRI environment and use them to characterize electromagnetic field behavior, image appearance, and temperature increase due to field/tissue interactions in MRI. Such tools are increasingly becoming an integral part of engineering and safety assurance in MRI.

Magnetic Resonance Images

In order to better predict, understand, and evaluate the effects of static, gradient, and RF electromagnetic fields on MR images, we developed an MRI System Simulator. The Simulator utilizes the Bloch equation with consideration of realistic field distributions (including multiple transmit and receive coils) throughout the subject. It also generates realistic, correlated, random noise based on the electric fields of the receive coils and calculates the heating (SAR) distribution throughout the sample based on the electric fields of the transmit coils 1, 2.

The simulator engine is capable of calculating signal, noise, and SAR for arbitrary samples, field distributions, and sequences. Future development will be focused on improving the library of available sequences and reconstruction algorithms.

Sponsors

Latest Updates

Philanthropic Support

We gratefully acknowledge generous support for radiology research at NYU Langone Medical Center from:
 
• The Big George Foundation
• Raymond and Beverly Sackler
• Bernard and Irene Schwartz

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