Abstract
In this study, the design, numerical modelling, and construction of various Helmholtz pair coil systems were investigated to produce a homogeneous magnetic field. The magnetic field was simulated using three different Helmholtz coil systems including 2-coil, 3-coil, and 4-coil combinations in order to optimize the field homogeneity and strength over a region of interest that consists of a cylindrical geometry with a height of 700 mm and a diameter of 90 mm. The simulated magnetic field created by the 4-coil system was found to be more homogenous than 3-coil and 2-coil systems over the region of interest. The 4-coil system was constructed and tested by using two commercially available low-power (P=600 W) DC power supplies. For further optimization, the number of turns and diameter of coil elements were simulated. The optimum number of turns and elements were determined to be 140 and 80 turns for the outer pair and inner pair of the 4-coil system, respectively. Finally, the produced magnetic field strength was measured using a hand-held gaussmeter and compared to the simulated magnetic field. We found that the system can produce a magnetic field of B=7.5047 ± 0.0562 mT, and the correlation between simulated and measured magnetic fields were calculated to be R=0.9824 with (p<0.001) suggesting a statistically significant agreement.
Highlights
Recent improvements in the field of magnetic resonance imaging (MRI) have shown that relatively low-magnetic fields lower than 0.5 Tesla can be used to achieve reasonable image quality compared to the clinical MR scanners that employ magnetic field strength stronger than 1 Tesla [1, 2]
Custom-built magnet systems and detectors were widely used in nuclear magnetic resonance (NMR) systems for producing uniform magnetic fields in medical, biological and chemical analysis applications [23,24,25,26,27]
Helmholtz coils were very effective for generating uniform magnetic fields over larger volumes, the classical twocoil systems require a distance between the coils that is equal to the coil radius making it difficult to implement into the lowfield NMR and MRI systems
Summary
Recent improvements in the field of magnetic resonance imaging (MRI) have shown that relatively low-magnetic fields lower than 0.5 Tesla can be used to achieve reasonable image quality compared to the clinical MR scanners that employ magnetic field strength stronger than 1 Tesla [1, 2]. Custom-built magnet systems and detectors were widely used in nuclear magnetic resonance (NMR) systems for producing uniform magnetic fields in medical, biological and chemical analysis applications [23,24,25,26,27]. Helmholtz coils were very effective for generating uniform magnetic fields over larger volumes, the classical twocoil systems require a distance between the coils that is equal to the coil radius making it difficult to implement into the lowfield NMR and MRI systems. In this respect, Helmholtz systems that consist of multi-coil pairs would offer further improvements in the design and construction of the low-field systems
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