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Medical Reference Services Quarterly 2023In 2007, Diane Ream Rourke published in this journal, the history and explanation for Baptist Hospital in Florida to include its library on its successful Magnet...
In 2007, Diane Ream Rourke published in this journal, the history and explanation for Baptist Hospital in Florida to include its library on its successful Magnet journey. This article draws heavily from American Nursing Credentialing Center (ANCC) Magnet Information pages. It begins with a quick review of the history of the Program, further suggestions for a librarian's contribution to obtain Magnet Recognition and a brief current literature review on the values Magnet Recognition brings to a hospital's economics, patient care, and nursing staff. The quick history review and suggestions on the librarian contribution to the Magnet journey are based on an invited CE course by this author. The literature review on the values Magnet Recognition brings to a hospital's economics, patient care, and nursing staff was part of a presentation this author prepared for the Chief of Nursing. This author was a Magnet Champion and Magnet exemplar when Virtua Health first earned its first Magnet designation.
Topics: Humans; Magnets; Florida; Hospitals; Information Centers; Librarians
PubMed: 36862615
DOI: 10.1080/02763869.2023.2160130 -
International Journal of Molecular... Dec 2023Anchoringsingle-molecule magnets (SMMs) on the surface of nanostructures is gaining particular interest in the field of molecular magnetism. The accurate organization of... (Review)
Review
Anchoringsingle-molecule magnets (SMMs) on the surface of nanostructures is gaining particular interest in the field of molecular magnetism. The accurate organization of SMMs on low-dimensional substrates enables controlled interactions and the possibility of individual molecules' manipulation, paving the route for a broad range of nanotechnological applications. In this comprehensive review article, the most studied types of SMMs are presented, and the quantum-mechanical origin of their magnetic behavior is described. The nanostructured matrices were grouped and characterized to outline to the reader their relevance for subsequent compounding with SMMs. Particular attention was paid to the fact that this process must be carried out in such a way as to preserve the initial functionality and properties of the molecules. Therefore, the work also includes a discussion of issues concerning both the methods of synthesis of the systems in question as well as advanced measurement techniques of the resulting complexes. A great deal of attention was also focused on the issue of surface-molecule interaction, which can affect the magnetic properties of SMMs, causing molecular crystal field distortion or magnetic anisotropy modification, which affects quantum tunneling or magnetic hysteresis, respectively. In our opinion, the analysis of the literature carried out in this way will greatly help the reader to design SMM-nanostructure systems.
Topics: Magnets; Nanostructures; Nanotechnology; Anisotropy
PubMed: 38203222
DOI: 10.3390/ijms25010052 -
Saudi Medical Journal Aug 2021To systematically review the occurrence of magnet or receiver/stimulator displacement following cochlear implant (CI) placement complication and evaluate the existing...
OBJECTIVES
To systematically review the occurrence of magnet or receiver/stimulator displacement following cochlear implant (CI) placement complication and evaluate the existing literature on this topic.
METHODS
A systematic literature search was conducted using PubMed, Scopus, Web of Science, Virtual Health Library (VHL), and Cochrane Library. Original studies reporting cases of magnet or receiver-stimulator migration occurring as a complication after CI placement were included. The quality of the included studies was evaluated using the National Institutes of Health Quality Assessment Tool for observational studies and CARE checklist for case studies.
RESULTS
A total of 36 studies, including 6469 patients, were included. Magnet migration was reported in 82 (1.3%) patients, while receiver/stimulator was reported in 4 (0.1%) cases. The cause of magnet migration was identified in 78 cases; MRI-induced movement was the most frequently reported cause (n=43, 55.1%), followed by head trauma (n=25, 32.1%). A total of 20 studies involving 35 patients with magnet migration performed skull radiography to diagnose magnet migration. Revision/exploratory surgery with surgical repositioning or replacement was the most frequent management procedure (n=46).
CONCLUSIONS
Further research on magnet pocket design and standard protocols for MRI in CI users is needed. Early diagnosis of magnet migration and instant referral to specialized CI centers is necessary for proper management and prevention of major complications. PROSPERO REG. NO. CRD: 42020204514.
Topics: Cochlear Implantation; Cochlear Implants; Humans; Magnetic Resonance Imaging; Magnets; Reoperation
PubMed: 34344804
DOI: 10.15537/smj.2021.42.8.20210294 -
Magma (New York, N.Y.) Apr 2023The Iseult MRI is an actively shielded whole-body magnet providing a homogeneous and stable magnetic field of 11.7 T. After nearly 20 years of research and development,... (Review)
Review
OBJECTIVES
The Iseult MRI is an actively shielded whole-body magnet providing a homogeneous and stable magnetic field of 11.7 T. After nearly 20 years of research and development, the magnet successfully reached its target field strength for the first time in 2019. This article reviews its commissioning status, the gradient-magnet interaction test results and first imaging experience.
MATERIALS AND METHODS
Vibration, acoustics, power deposition in the He bath, and field monitoring measurements were carried out. Magnet safety system was tested against outer magnetic perturbations, and calibrated to define a safe operation of the gradient coil. First measurements using parallel transmission were also performed on an ex-vivo brain to mitigate the RF field inhomogeneity effect.
RESULTS
Acoustics measurements show promising results with sound pressure levels slightly above the enforced limits only at certain frequency intervals. Vibrations of the gradient coil revealed a linear trend with the B field only in the worst case. Field monitoring revealed some resonances at some frequencies that are still under investigation.
DISCUSSION
Gradient-magnet interaction tests at up to 11.7 T are concluded. The scanner is now kept permanently at field and the final calibrations are on-going to pave the road towards the first acquisitions on volunteers.
Topics: Humans; Magnets; Magnetic Resonance Imaging; Magnetic Fields; Magnetics; Whole Body Imaging
PubMed: 36715884
DOI: 10.1007/s10334-023-01063-5 -
Cochlear Implants International Mar 2021The new CI600 series cochlear implants (Nucleus Profile™ Plus Series; CI) are more MRI (magnetic resonance imaging) compatible. The magnet's attraction force is...
The new CI600 series cochlear implants (Nucleus Profile™ Plus Series; CI) are more MRI (magnetic resonance imaging) compatible. The magnet's attraction force is lower, possibly posing a problem in patients needing a higher strength magnet due to increased skin thickness. This study aims to investigate the relationship between skin thickness and magnet strength in patients undergoing cochlear implantation. This cross-sectional study used data from 46 patients with cochlear implants. Data collected included age, body mass index, magnet strength used, pre-operative and post-operative imaging and skin thickness. There was a weak, positive correlation between magnet strength and skin thickness, which was not statistically significant ((46) = 0.149, = 0.324). There was a weak, positive correlation between magnet strength and body mass index, which was not statistically significant ((46) = 0.113, = 0.456). There was a moderate, positive correlation between body mass index and skin thickness, which was statistically significant ((46) = 0.362, = 0.012). The increased skin thickness in patients with higher body mass indexes, might mean that these patients will require a stronger magnet. There are concerns that the lower attraction force in the CI600 (Nucleus Profile™ Plus Series) may pose a retention problem for these patients. This might mean that discussions about skin flap reduction surgery are needed.
Topics: Cochlear Implantation; Cochlear Implants; Cross-Sectional Studies; Humans; Magnetic Resonance Imaging; Magnets; Surgical Flaps
PubMed: 32993474
DOI: 10.1080/14670100.2020.1824640 -
Emergency Medicine Journal : EMJ Jun 2022The ingestion of small, strong, rare-earth magnets, also termed 'ball magnets', can rapidly result in life-threatening bowel injuries. The objective of this study was to...
INTRODUCTION
The ingestion of small, strong, rare-earth magnets, also termed 'ball magnets', can rapidly result in life-threatening bowel injuries. The objective of this study was to report the incidence and management of 'ball magnet' ingestion in children across the UK and to discuss the potential implications for policy-makers and public awareness campaigns.
METHODS
In this multi-centre survey of UK major trauma centres (MTCs), paediatric patients admitted to hospital following 'ball magnet' ingestion from 1 January 2020 to 31 December 2020 were included.
RESULTS
Responses were received from 11 MTCs (52%) reporting a total of 53 children admitted with 'ball magnet' ingestion over the 1-year study period. Most patients (n=51) presented following unintentional ingestion. 36 (68%) patients presented asymptomatically following witnessed or reported ingestion. In symptomatic patients, abdominal pain and vomiting were the the most common symptoms. The median number of 'ball magnets' ingested was 5.0 (IQR 3.0-7.8), range 1 to 63. 27 (51%) patients underwent operative intervention; laparotomy being the the most common (n=24, 89%). There were no deaths reported during the study period.
CONCLUSION
This multi-centre survey from the UK demonstrates the serious impact of 'ball magnet' ingestion in children. Clinicians, regulators and caregivers must work symbiotically in order to prevent, recognise and reduce life-threatening bowel injuries.
Topics: Abdominal Pain; Child; Eating; Foreign Bodies; Humans; Laparotomy; Magnets
PubMed: 34544782
DOI: 10.1136/emermed-2021-211767 -
Anales de Pediatria Nov 2022The ingestion of magnetic objects can cause complications in children, and there are no epidemiological or clinical data on the subject in Spain. (Observational Study)
Observational Study
INTRODUCTION
The ingestion of magnetic objects can cause complications in children, and there are no epidemiological or clinical data on the subject in Spain.
OBJECTIVES
To determine the incidence, epidemiological characteristics and management of magnet ingestion in paediatric emergency departments in Spain.
MATERIAL AND METHODS
Prospective observational multicentre study conducted over a 3-year period. The study universe consisted of patients aged less than 14 years.
RESULTS
The incidence was 4.8 cases per 100 000 emergency care episodes. Of the 72 patients included (mean age, 7.2 years), 54% were male. Seven percent had neuropsychiatric disorders. Sixty-one percent of the magnets were spherical and 69% came from toys. The size was variable, most frequently between 5 and 10 mm (50%), and ranging from 3 to 30 mm. Eighty-six percent of patients were asymptomatic. The most frequent symptom was abdominal pain. Eighty-three percent of the patients sought medical care within 6 h of ingestion and 92% within 24 h. Thirty-one percent of the cases were of multiple ingestion. Endoscopy was required for extraction in 15% of cases, a proportion that rose to 36% in the group of cases of multiple ingestion. None of the patients required surgery. We did not observe any gastrointestinal complications of magnet ingestion.
CONCLUSIONS
The ingestion of multiple magnets is less frequent than single magnet ingestion, and we did not observe any complications despite the lower frequency of procedures compared to other studies.
Topics: Child; Humans; Male; Female; Magnets; Foreign Bodies; Prospective Studies; Retrospective Studies; Endoscopy, Gastrointestinal; Emergency Service, Hospital; Eating
PubMed: 36115782
DOI: 10.1016/j.anpede.2022.09.001 -
Journal of Magnetic Resonance (San... Sep 2022We present the design, validation, and testing of an optimized 5 MHz three-magnet array with a gradient parallel to the magnet surface. An approach to permanent magnet...
We present the design, validation, and testing of an optimized 5 MHz three-magnet array with a gradient parallel to the magnet surface. An approach to permanent magnet array design is explored with a genetic algorithm. The genetic algorithm was used to produce multiple designs based on an inventory of available block magnets. One three-magnet array was constructed for testing. Constant gradients of 205, 115, and 61 gauss/cm, parallel to the magnet surface are found at displacements of 1.5, 2.0, and 2.5 cm from the surface of the magnet, respectively. Regions of useful gradient are roughly 1 cm in length. We constructed and field plotted the three-magnet array and found good agreement between the experimental and simulated magnet fields. To test applicability, we performed T and T relaxation measurements on a cod liver oil sample, and a simple doped water flow measurement.
Topics: Equipment Design; Magnetic Fields; Magnetic Resonance Spectroscopy; Magnets
PubMed: 35905531
DOI: 10.1016/j.jmr.2022.107266 -
Journal of Magnetic Resonance (San... Jun 2022Halbach magnet has great potential in nuclear magnetic resonance device, where the field homogeneity requirement puts heavy demands on high efficiencypassive shimming...
Halbach magnet has great potential in nuclear magnetic resonance device, where the field homogeneity requirement puts heavy demands on high efficiencypassive shimming (PS) technique. Conventional PS involves a tedious iteration process of the magnetic block/sheet number and positions optimization. In this paper, we propose a PS method based on magnetic sheet arrays (MSAs) targeting at spherical harmonic basis up to the 3rd order including dedicated composition of Y(4Z2-X2-Y2), Z3 and X(4Z2-X2-Y2) (n = 3, m = -1,0,1) with cross terms to implement structural field compensation. With this approach, the homogeneity of a 0.5 T Halbach magnet was improved from the original 811 ppm to 4.7 ppm in a L15 mm × R2.5 mm water sample. Rough shimming in another 0.93 T Halbach magnet also improved the homogeneity from 1103 ppm to 125 ppm in R2.5 mm sphere. This work provides a flexible, convenient PS method based on MSAs for compact Halbach magnet, which can be applied in NMR spectrometers and other high homogeneity application circumstances.
Topics: Magnetic Resonance Imaging; Magnetic Resonance Spectroscopy; Magnetics; Magnets
PubMed: 35447511
DOI: 10.1016/j.jmr.2022.107210 -
The Journal of Experimental Biology Nov 2021For studies on magnetic compass orientation and navigation performance in small bird species, controlled experiments with orientation cages inside an electromagnetic...
For studies on magnetic compass orientation and navigation performance in small bird species, controlled experiments with orientation cages inside an electromagnetic coil system are the most prominent methodological paradigm. These are, however, not applicable when studying larger bird species and/or orientation behaviour during free flight. For this, researchers have followed a very different approach, attaching small magnets to birds, with the intention of depriving them of access to meaningful magnetic information. Unfortunately, results from studies using this approach appear rather inconsistent. As these are based on experiments with birds under free-flight conditions, which usually do not allow exclusion of other potential orientation cues, an assessment of the overall efficacy of this approach is difficult to conduct. Here, we directly tested the efficacy of small magnets for temporarily disrupting magnetic compass orientation in small migratory songbirds using orientation cages under controlled experimental conditions. We found that birds which have access to the Earth's magnetic field as their sole orientation cue show a general orientation towards their seasonally appropriate migratory direction. When carrying magnets on their forehead under these conditions, the same birds become disoriented. However, under changed conditions that allow birds access to other (i.e. celestial) orientation cues, any disruptive effect of the magnets they carry appears obscured. Our results provide clear evidence for the efficacy of the magnet approach for temporarily disrupting magnetic compass orientation in birds, but also reveal its limitations for application in experiments under free-flight conditions.
Topics: Animal Migration; Animals; Forehead; Magnetic Fields; Magnetics; Magnets; Orientation; Songbirds; Taxis Response
PubMed: 34713887
DOI: 10.1242/jeb.243337