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Renewal Challenges: The Case of the Republic of Georgia
Published in Frederick J. DeMicco, Ali A. Poorani, Medical Travel Brand Management, 2023
Lali Odosashvili, Ali A. Poorani
Forest-dimming has started in the west of the country since 1928. The region was known for the cultivation of citrus trees and tea. In addition, for the first time, the benefits of magnetic sand were noticed by quarry workers who were using sand in nearby factories. Soon therapeutic properties of sand drew the attention of the community, medical professionals, and research centers. Artificially created magnetic fields are widely used in medicine. Some people use magnet therapy for treating pain, such as foot, back, or joint pain (University of Michigan Health). In-resort Ureki, you can find naturally created low-intensity magnetic field. Above that, the resort has a subtropical climate, sea, and Sun from May to October.
Principles behind Magnetic Resonance Imaging (MRI)
Published in Michael Ljungberg, Handbook of Nuclear Medicine and Molecular Imaging for Physicists, 2022
Magnetic resonance imaging (MRI) is a well-established medical imaging technique, traditionally associated with excellent soft-tissue contrast properties. Current clinical MRI systems provide not only morphological information throughout the body, but also a number of advanced techniques related to tissue and organ function, physiology, and microstructure.
MRI before Myomectomy
Published in Rooma Sinha, Arnold P. Advincula, Kurian Joseph, FIBROID UTERUS Surgical Challenges in Minimal Access Surgery, 2020
The fundamental requirement to obtain an image from any tissue in the body is the presence of hydrogen atoms in the tissue. MRI uses the magnetic property of hydrogen to generate images. So the tissues that contain abundant hydrogen produce high signals and hence a good image. The tissues that contain less hydrogen appear dark and hence will not produce good signals. The above statement is just a simplified rule of thumb.
Semi-quantitative methodology to assess health and safety risks arising from exposure to electromagnetic fields up to 300 GHz in workplaces according to Italian regulations
Published in International Journal of Occupational Safety and Ergonomics, 2023
For wearers of AIMDs, the technical Standard No. 50527-1:2016 [50] establishes that the assessment of compliance with the RLs of Council Recommendation 1999/519/EC [31] should be carried out without including any time average for frequencies above 100 kHz, for the purpose of preventing possible indirect effects of EMF interference with the normal operation of the devices. In relation to exposure to static magnetic fields, most cardiac pacemakers are unlikely to be disturbed in fields below the AL of 0.5 mT referred to in Directive 2013/35/EU [32]. Therefore, workers bearing AIMDs must not enter places where the magnetic flux density for static magnetic fields is greater than 0.5 mT. The same considerations apply to medical devices worn on the body that should be assimilated to AIMDs for the purpose of EMF risk assessment [34,44].
The influences and regulatory mechanisms of magnetic fields on circadian rhythms
Published in Chronobiology International, 2022
Long-Sheng Tang, Zi-Xuan Fan, Xiao-Fei Tian, Shi-Min He, Cheng Ji, An-Qi Chen, Da-Long Ren
Magnetic fields are medium that transmits the magnetic force between objects. As an important parameter for regulating the quantum state of matter, magnetic fields play an irreplaceable role in discovering new phenomena, revealing new laws, exploring new materials and catalyzing new technologies. Magnetic flux density (MFD) (Tesla, T) is a basic physical quantity used to describe the intensity of the magnetic fields. According to the correlations between the intensity, and direction of the magnetic fields with the change in time, magnetic fields can be divided into static magnetic fields and dynamic magnetic fields (Zhang et al. 2017b). The direction or intensity of the dynamic magnetic field changes with time, while the direction and intensity of the static magnetic field do not change with time(Lv et al. 2021). In the field of biomedicine, the magnetic field is divided into five levels based on the intensity, namely hypomagnetic field (<5 µT), weak magnetic field (5 µT-1 mT), medium magnetic field (1 mT-1 T), strong magnetic field (1 T-20 T) and super-strong magnetic field (>20 T) (Mo et al. 2012; Tian and Zhang 2018). The geomagnetic field (GMF) is a weak magnetic field with an MFD of about 50–60 µT, and the MFD of widely used magnetic resonance imaging (MRI) currently is 1–10 T (Tian and Zhang 2018). Recently, magnetic fields have been widely used in power equipment, medical diagnosis, material production, welding technology and transportation.
A comparison of imaging techniques to measure skin flap thickness in cochlear implant patients to enable pre-operative device selection
Published in Cochlear Implants International, 2022
Jacob Rees, Rohma Abrar, Emma Stapleton
The external transmitter and the internal receiver–stimulator package are held in close proximity via magnetic force through the skin which ensures that the transmitter remains adhered to the patient’s scalp (Posner et al., 2010). However, the use of magnets can considerably complicate a patient’s experience of magnetic resonance imaging (MRI) (Carlson et al., 2015). To avoid the process of magnet removal and re-implantation if a patient has to undergo an essential MRI scan, some manufacturers advice measures such as limiting the scan to 1.5 Tesla MRI and tightly wrapping a head bandage over the implant prior to MRI scanning (MED-EL; Cass et al., 2019; Migirov and Wolf, 2013). Unfortunately, complications such as pain (70%) and magnet dislocation (9%) can still occur despite such pre-emptive measures (Grupe et al., 2016). In response to such MRI-associated complications, cochlear implant manufacturers have now developed MRI-compatible implants. This compatibility is largely a result of using internal magnets that spin whilst within an MRI scanner.