Design and simulation of different excitation coil arrangements in magnetic particle imaging technique for single sided scanner
Magnetic particle imaging (MPI) is a new tomographic method for three-dimensional (3D) imaging by using magnetic nanoparticles (MNP) tracer. MPI consists of three important elements, which are MNP, magnetic coils and image reconstruction method. The complex topology of skin surface, coil¶s phy...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/6454/1/24p%20MUHAMAD%20FIKRI%20SHAHKHIRIN%20BIRAHIM.pdf http://eprints.uthm.edu.my/6454/2/MUHAMAD%20FIKRI%20SHAHKHIRIN%20BIRAHIM%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/6454/3/MUHAMAD%20FIKRI%20SHAHKHIRIN%20BIRAHIM%20WATERMARK.pdf |
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| Summary: | Magnetic particle imaging (MPI) is a new tomographic method for three-dimensional
(3D) imaging by using magnetic nanoparticles (MNP) tracer. MPI consists of three
important elements, which are MNP, magnetic coils and image reconstruction method.
The complex topology of skin surface, coil¶s physical properties, configuration and
dimension, and high input current for excitation make scanning process more difficult
and limited. Image quality can be improved by enhancing the magnetic field induction
generated by the excitation coil towards the MNPs¶ location. This research focused on
finding alternative design for the excitation coil which can produce a strong and
homogeneous magnetic field up to 0.1 mT to detect the MNPs¶ location at 10 mm to
50 mm below the skin. First, several important elements such as scanner topology, coil
design parameters and deYelopment, and magnetic field induction¶s targeted distance,
are needed before developing and simulating the excitation coil. Second, nine coil
designs were developed and simulated using ANSYS Maxwell with different design
parameter and configuration. Lastly, mathematical calculation was compared with the
simulation result obtained from ANSYS Maxwell for result verification. Magnetic
field induction strength, magnetic field distribution direction, and homogeneity level
at specific point were considered for data analysis. This research outcome contributed
to a new idea of integration of Maxwell coil pair and vertically stacked sub-coil such
as in Design H that could produce a strong and homogeneous magnetic field of 17.5759
µT which was stronger compared with single excitation coil design that could only
produce 9.2298 µT at the 10 mm distance below the coil. In conclusion, a portable
single-sided MPI scanner with simple coil configuration, less bulky size, and low
current could be developed for MPI application to produce a strong and homogeneous
magnetic field induction towards the targeted MNP distances of 10 mm to 50 mm
below the coil compared with the conventional MPI system. It could be an ideal tool
for medical imaging application particularly to detect the breast cancer for early
prevention. |
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