First heating measurements of endovascular stents in magnetic particle imaging.

First heating measurements of endovascular stents in magnetic particle imaging. Phys Med Biol. 2018 Jan 15;: Authors: Wegner F, Friedrich T, Panagiotopoulos N, Vaalma S, Goltz JP, Vogt FM, Koch MA, Buzug TM, Barkhausen J, Haegele J Abstract Magnetic Particle Imaging (MPI) is a three-dimensional imaging method which visualizes the spatial distribution of Superparamagnetic Iron Oxide Nanoparticles (SPIOs) with oscillating and static magnetic fields. It is a quantitative method as the intensity of its signal is proportional to the concentration of the SPIOs. Due to its quantitativeness, high temporal resolution and kidney-safe tracers it is proposed to be a very promising noninvasive method for cardiovascular imaging. In this regard MPI in the presence of endovascular stents and assessment of stent patency with MPI has to be evaluated. The purpose of this study was to evaluate the heating of endovascular stents due to the alternating magnetic fields as a safety aspect of MPI. Twenty one commercially available endovascular stents of different sizes (diameter: 3, 3.5, 4, 5, 6, 7, 8, 10 mm, length: 11 - 99 mm) and materials (stainless steel, nitinol, platinum-chromium, cobalt-chromium) were evaluated. They were implanted in silicone tubes matching the stent diameter and placed at the center of the bore of a preclinical MPI scanner (Bruker-Biospin, Ettlingen, Germany). The temperature was measured with fiber optic thermometers over a scan duration of 431 second...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research

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Authors: Sun PO, Schyns MVP, Walbeehm ET Abstract Carpal tunnel syndrome (CTS) is the most frequently operated neurological disorder of the hand. Incidence of patients remaining symptomatic has been reported up to 30% after primary release. Revision surgery remains challenging although multiple surgical options have been described. In this case series a simple novel technique, the palmaris longus interposition, is described for the treatment of recurrent and persistent CTS. Patients who underwent PLI between October 2013 and 2018 and without underlying neurological or hand disorders severely affecting the operated ...
Source: Journal of Plastic Surgery and Hand Surgery - Category: Surgery Tags: J Plast Surg Hand Surg Source Type: research
Conclusion: It was demonstrated that λ/2- and λ/4-pitch configurations result in better LR and contrast than λ-pitch configuration. Significance: Based on the results obtained, the proposed method has the potential to serve as an easy-to-integrate and simple way of achieving better image quality without requiring to increase the system complexity with existing transducer array probe technology in regular clinical- scanners.
Source: IEEE Transactions on Biomedical Engineering - Category: Biomedical Engineering Source Type: research
Nonintubated thoracic surgery arose as supplemental evolution of minimally invasive surgery and is gaining popularity. A proper nonintubated thoracic surgery unit is mandatory and should involve surgeons, anesthesiologists, intensive care physicians, physiotherapists, psychologists, and scrub and ward nurses. Surgical training should involve experienced and young surgeons. It deserves a step-by-step approach and consolidated experience on video-assisted thoracic surgery. Due to difficulty in reproducing lung and diaphragm movements, training with simulation systems may be of scant value; instead, preceptorships and invited...
Source: Thoracic Surgery Clinics - Category: Cardiovascular & Thoracic Surgery Authors: Source Type: research
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Source: Sexually Transmitted Diseases - Category: Sexual Medicine Tags: Original Studies Source Type: research
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Source: International Journal of Radiation Biology - Category: Radiology Tags: Int J Radiat Biol Source Type: research
CONCLUSIONS: Our AATR shows the capabilities of adapting to varying types of materials, even the unknown materials which are not available in the training data, adapting to varying required probability of detection and adapting to varying scales of the threat object. PMID: 31744038 [PubMed - as supplied by publisher]
Source: Journal of X-Ray Science and Technology - Category: Radiology Tags: J Xray Sci Technol Source Type: research
Authors: Cheng Y, Bai L, Shang J, Tang Y, Ling X, Guo B, Gong J, Wang L, Xu H Abstract The present study aimed to assess the performance of positron emission tomography‑magnetic resonance imaging (PET/MR) for the visualization and characterization of lesions. In addition, the present study investigated whether the apparent diffusion coefficient (ADC) and intravoxel incoherent motion parameters exhibited any significant correlation with standardized uptake values (SUV) in patients with nasopharyngeal carcinoma (NPC). A total of 35 patients with NPC underwent whole body PET‑computed tomography (CT) and head ...
Source: Oncology Reports - Category: Cancer & Oncology Tags: Oncol Rep Source Type: research
In this study, 6-deoxy-6-arginine modified chitosan (DAC), was synthesized and characterized by Fourier Transform Infrared Spectroscopy (FTIR), 1H and 13C nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC) and elemental analysis. The arginine was grafted onto C6 groups of chitosan. Antibacterial activity of DAC against gram-negative bacteria Escherichia coli (E. coli) and gram-positive bacteria Staphylococcus aureus (S. aureus) were investigated at concentration between 0.02 mg/mL and 10 mg/mL. Cell viability assessment was estimated in vitro with Caco-2 and L929 cells. Water solubility...
Source: Carbohydrate Polymers - Category: Biomedical Science Source Type: research
Publication date: Available online 21 November 2019Source: Reactive and Functional PolymersAuthor(s): Jie Wen, Mingwang Pan, Jinfeng Yuan, Jiaxi Wang, Lei Zhu, Zhanyu Jia, Shaofeng SongAbstractMechanical properties (such as strength and toughness) of commonly synthetic polyurethane hydrogels (PUHs) cannot satisfy demands of practical load-bearing applications. Consequently, it is still a challenge to develop PUHs combined with excellent strength and toughness. Here, a new type of PUHs is synthesized through using polyethylene glycol, isophorone diisocyanate, trimethylolpropane (TMP) and polyphenol compound resveratrol (RST...
Source: Reactive and Functional Polymers - Category: Chemistry Source Type: research
Publication date: Available online 21 November 2019Source: Catalysis TodayAuthor(s): Qiang Zhang, Chaoyang LiAbstractThe mist chemical vapor deposition method was used to synthesize pure anatase phase titanium dioxide thin films on glass substrates. The effects of water-to-methanol ratio on the structural, optical and photocatalytic properties of titanium dioxide thin films were investigated. Titanium dioxide films deposited by mist chemical vapor deposition were always anatase phase independent of the various water-to-methanol ratios investigated. From the GIXRD results, it was found that with the decrease of the water-to...
Source: Catalysis Today - Category: Chemistry Source Type: research
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