Optimization and Construction of Single-side Nuclear Magnetic Resonance Magnet

Ji, Yongliang; He, Wei; He, Xiaolong

doi:10.11591/telkomnika.v11i10.3460

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…Figure 3 Permanent magnet magnetic device with adjustable magnetic system. 15 Table 1 shows the distribution of patients with post-traumatic knee synovitis according to VAS before treatment by experimental group, age groups and gender (Table 1). It was revealed that post-traumatic knee synovitis predominated in the male gender and the age group of 15-25 years for G1 and G2.…”

Section: Resultsmentioning

confidence: 99%

Magnetic bed for the treatment of different somatic diseases: design and simulation

Torres¹,

Rodríguez²,

Cayamo³

2023

MOJSM

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At present, sports injuries that occur during the practice of a sport or physical exercise are becoming more and more common, due to a series of predisposing factors that make an individual more susceptible to suffer these injuries. In Cuba there is a high prevalence of articular affections of knees and ankles, with a high prevalence in people older than 60 years; in the province of Santiago de Cuba 45% of the total number of consultations correspond to soft tissue injuries. One of the applications of the electromagnetic field is in the treatment of different pathologies of the osteomuscular system (Soma). The objective of this work lies in the design of a magnetic bed with permanent magnets, in analogy to a circular Halbach type configuration for the treatment of different diseases of the soma, which consists of three main parts: the magnetic system, which generates magnetic induction for therapeutic purposes, the opening and closing system of the magnetic system, which allows the radial variation of the magnetic system and the patient-support bed system, which allows the positioning of the patient in the treatment area. The principle of operation is that the therapist selects the induction of the magnetic field and the homogeneity of the magnetic field, depending on the pathology(s) to be treated, through a software that controls the movement of the opening and closing system of the magnetic system and the patient-bed support system, which is coupled to a stepper motor reducer that ensures a precise and accurate positioning of the sample (or patient) according to the area to be treated, which allows more than 80% effectiveness of the therapy with respect to conventional treatment.

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Section: Resultsmentioning

confidence: 99%

Magnetic bed for the treatment of different somatic diseases: design and simulation

Torres¹,

Rodríguez²,

Cayamo³

2023

MOJSM

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Optimization of the design of a single-sided magnetic resonance magnet array for improved T₂ estimation accuracy

Miao,

Ren,

Jiang

et al. 2024

Meas. Sci. Technol.

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Single-sided magnetic resonance (SSMR) technology has a compact structure and great potential for use in mobile and nondestructive detection of large aqueous materials. As the detection depth increases, the magnetic field gradient generated by the magnetic resonance magnet placed on one side weakens, leading to a large distortion of T2, thereby significantly impeding accurate estimation of the pore size distribution within the detection target. In this study, to address this problem, the distortion in the region of interest (ROI) is significantly reduced by optimizing the size and arrangement of the SSMR magnet array. First, to evaluate the T2 distortion within the ROI, we developed a T2 distortion loss function based on α and θ, which are key parameters of the spin echo (SE) signal. We then combined the nonlinear constraints with the loss function to form a Lagrangian function, which was solved via the Newton iteration method to obtain the magnet array parameters. The magnet array is called the AT magnet array. The T2 distortion was quantitatively evaluated by calculating the SE signal generated by the AT magnet array in the ROI. Furthermore, we compared the detection results obtained with the AT and the semi-annular (SA) magnet array. The results showed that within the 3 cm × 3 cm target range of a 10 cm depth, the AT magnet array had a smaller T2 distortion of only 1.3%. After the ROI was expanded to 5 cm × 5 cm, the T2 distortion of the SE signal measured by the AT magnet array was 6%, which met the SSMR detection accuracy requirements in this range. Therefore, the optimized design of the magnet array based on α and θ provides a theoretical basis for obtaining SE signals with low T2 distortion at large depths and over large areas via SSMR.

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Optimization and Construction of Single-side Nuclear Magnetic Resonance Magnet

Cited by 2 publications

References 13 publications

Magnetic bed for the treatment of different somatic diseases: design and simulation

Magnetic bed for the treatment of different somatic diseases: design and simulation

Optimization of the design of a single-sided magnetic resonance magnet array for improved T₂ estimation accuracy

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Optimization and Construction of Single-side Nuclear Magnetic Resonance Magnet

Cited by 2 publications

References 13 publications

Magnetic bed for the treatment of different somatic diseases: design and simulation

Magnetic bed for the treatment of different somatic diseases: design and simulation

Optimization of the design of a single-sided magnetic resonance magnet array for improved T2 estimation accuracy

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Optimization of the design of a single-sided magnetic resonance magnet array for improved T₂ estimation accuracy