Abstract
In the field of magnetic resonance imaging (MRI), besides the main magnetic field and the radio frequency (RF) system, the gradient coils system also plays an important role in signal acquisition. Generally, there are 2 transverse gradient coils and 1 longitudinal gradient coil. In this research, the magnetic field (or gradient) generated by the conventional transverse coil, namely the Golay coil was mapped. The calculation algorithm of the magnetic field generated was written in C-programming language, compiled by the GNU-compiler collection (GCC) and was based on a forward analytical approach by using the Biot-Savart Law. The data was then visualized by Gnuplot. The magnetic field was successfully calculated and plotted using open-source softwares running under Ubuntu operating system and will provide valuable data especially for gradient coil designer.
Highlights
Gradient coils play an important role in magnetic resonance imaging (MRI) since they directly affect the resolution of the signal
There are usually three sets of gradient coils in a MRI system, each generating a magnetic gradient along each orthogonal axis, namely x, y and z
The longitudinal gradient coil will generate a magnetic gradient along z-direction which is derived from the shape of Maxwell coil
Summary
Gradient coils play an important role in magnetic resonance imaging (MRI) since they directly affect the resolution of the signal. There are usually three sets of gradient coils in a MRI system, each generating a magnetic gradient along each orthogonal axis, namely x, y and z. The longitudinal gradient coil will generate a magnetic gradient along z-direction which is derived from the shape of Maxwell coil. The main purpose of gradient coils in a MRI system is to produce a magnetic gradient along each axis, helping in slice selection, frequency encoding and phase encoding. Due to several constraints such as the inductance and the size of the coil, these few characteristics will have to be traded off with each other
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