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Cantalamessa, Antonio,Caobelli, Federico,Paghera, Barbara,Caobelli, Antonio,Vavassori, Francesca The Korea Society of Nuclear Medicine 2011 핵의학 분자영상 Vol.45 No.2
Purpose Pheochromocytoma (PH) is a rare catecholaminesecreting tumor that arises from chromaffin tissue within the adrenal medulla and extra-adrenal sites; commonly it is sporadic, and malignant PH accounts for about 10% of all cases. Several imaging modalities have been used for the diagnosis and staging of this tumor: functional imaging using radio-labelled metaiodobenzylguanidine and, more recently, $^{18}F$-fluorodeoxyglucose positron emission tomography ($^{18}F$-FDG PET/CT), which offers substantial sensitivity and specificity to correctly detect metastatic PH and helps to identify patients suitable for treatment with radiopharmaceuticals. The aim of our study was to compare CT, $^{18}F$-FDG PET/CT, and $^{123}I$-metaiodobenzylguanidine single photon emission tomography ($^{123}I$-MIBG SPECT) as feasible methods to restage patients diagnosed histologically with PH. Methods We retrospectively evaluated 38 patients (27 females and 11 males; mean age: $44{\pm}15$ years) with malignant PH documented histologically after surgical intervention. These patients underwent CT, $^{18}F$-FDG PET/CT, and $^{123}I$-MIBG SPECT. Results $^{18}F$-FDG PET/CT showed positive results for neoplastic tissue in 33/38 patients (86.8%) and negative in 5/38 (13.2%), in concordance with CT alone. $^{123}I$-MIBG SPECT was positive in 30/38 patients (78,9%) and negative in 8/38 (21.1%). No differences in lesion numbers were found between $^{18}F$-FDG PET/CT and CT, whereas a difference could be demonstrated between $^{18}F$-FDG PET/CT and $^{123}I$-MIBG SPECT. Conclusion $^{18}F$-FDG PET/CT could more accurately restage patients with PH than CT and $^{123}I$-MIBG SPECT, also in the absence of a staging study.
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Sander, D,Valenzuela, S O,Makarov, D,Marrows, C H,Fullerton, E E,Fischer, P,McCord, J,Vavassori, P,Mangin, S,Pirro, P,Hillebrands, B,Kent, A D,Jungwirth, T,Gutfleisch, O,Kim, C G,Berger, A Institute of Physics Publishing Ltd. 2017 Journal of Physics. D, Applied Physics Vol.50 No.36
<P>Building upon the success and relevance of the 2014 Magnetism Roadmap, this 2017 Magnetism Roadmap edition follows a similar general layout, even if its focus is naturally shifted, and a different group of experts and, thus, viewpoints are being collected and presented. More importantly, key developments have changed the research landscape in very relevant ways, so that a novel view onto some of the most crucial developments is warranted, and thus, this 2017 Magnetism Roadmap article is a timely endeavour. The change in landscape is hereby not exclusively scientific, but also reflects the magnetism related industrial application portfolio. Specifically, Hard Disk Drive technology, which still dominates digital storage and will continue to do so for many years, if not decades, has now limited its footprint in the scientific and research community, whereas significantly growing interest in magnetism and magnetic materials in relation to energy applications is noticeable, and other technological fields are emerging as well. Also, more and more work is occurring in which complex topologies of magnetically ordered states are being explored, hereby aiming at a technological utilization of the very theoretical concepts that were recognised by the 2016 Nobel Prize in Physics.</P> <P>Given this somewhat shifted scenario, it seemed appropriate to select topics for this Roadmap article that represent the three core pillars of magnetism, namely magnetic materials, magnetic phenomena and associated characterization techniques, as well as applications of magnetism. While many of the contributions in this Roadmap have clearly overlapping relevance in all three fields, their relative focus is mostly associated to one of the three pillars. In this way, the interconnecting roles of having suitable magnetic materials, understanding (and being able to characterize) the underlying physics of their behaviour and utilizing them for applications and devices is well illustrated, thus giving an accurate snapshot of the world of magnetism in 2017.</P> <P>The article consists of 14 sections, each written by an expert in the field and addressing a specific subject on two pages. Evidently, the depth at which each contribution can describe the subject matter is limited and a full review of their statuses, advances, challenges and perspectives cannot be fully accomplished. Also, magnetism, as a vibrant research field, is too diverse, so that a number of areas will not be adequately represented here, leaving space for further Roadmap editions in the future. However, this 2017 Magnetism Roadmap article can provide a frame that will enable the reader to judge where each subject and magnetism research field stands overall today and which directions it might take in the foreseeable future.</P> <P>The first material focused pillar of the 2017 Magnetism Roadmap contains five articles, which address the questions of atomic scale confinement, 2D, curved and topological magnetic materials, as well as materials exhibiting unconventional magnetic phase transitions. The second pillar also has five contributions, which are devoted to advances in magnetic characterization, magneto-optics and magneto-plasmonics, ultrafast magnetization dynamics and magnonic transport. The final and application focused pillar has four contributions, which present non-volatile memory technology, antiferromagnetic spintronics, as well as magnet technology for energy and bio-related applications. As a whole, the 2017 Magnetism Roadmap article, just as with its 2014 predecessor, is intended to act as a reference point and guideline for emerging research directions in modern magnetism.</P>
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Coercivity Dependence on Periodicity of Co and Py Antidot Arrays
Celia Cast´an-Guerrero,Juan Bartolom´e,Fernando Bartolom´e,Luis Miguel Garc´ıa,Javier Ses´e,Pavel Strichovanec,Julia Herrero-Albillos,Karla J. Merazzo,Manuel V´azquez,Paolo Vavassori 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
An experimental study on the control of thin films magnetic coercivity through the change in geometry of antidot arrays has been performed on two different materials: cobalt and permalloy. Antidot arrays have been fabricated using a Focused Ion Beam, and magnetic hysteresis loops have been measured using Kerr effect microscopy. The coercivity dependence on the material and the array periodicity have been studied. A novel method to estimate the antidot diameter from MOKE data is presented. Results suggest a widening of the antidot effective diameter compared to the one measured from SEM images. This could be attributed to a damage of the magnetic material around the holes during the fabrication process, which leads to amorphization and concomitant reduction of the surrounding film magnetization.
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