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Magnetic imaging

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https://www.readbyqxmd.com/read/28724223/chromium-vi-adsorption-from-wastewater-using-porous-magnetite-nanoparticles-prepared-from-titanium-residue-by-a-novel-solid-phase-reduction-method
#1
Genkuan Ren, Xinlong Wang, Penghui Huang, Benhe Zhong, Zhiye Zhang, Lin Yang, Xiushan Yang
Porous magnetite nanoparticles were successfully synthesized by reduction of titanium residue with pyrite under nitrogen protection, and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, vibrating sample magnetometer, X-ray photoelectron spectroscope, zeta potential and Brunauer-Emmett-Teller method. The XRD analysis confirmed the formation of porous magnetite nanoparticles with single spinel structure. The SEM image demonstrated that porous magnetite nanoparticles displayed spherical shape with the average diameter of ~51nm...
July 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28724045/spinal-tumors-in-children
#2
Andrei Fernandes Joaquim, Enrico Ghizoni, Marcelo Gomes Cordeiro Valadares, Simone Appenzeller, Simone Dos Santos Aguiar, Helder Tedeschi
Introduction: Spinal tumors are rare in the pediatric population, presenting many specific peculiarities when compared to adults. We have performed a broad narrative review to describe the most common spinal tumors in children, discussing their main characteristics and management options. Method: The authors have performed an extensive review of the peer-reviewed literature addressing the aforementioned objectives. Results: Multimodality radiological studies (plain films, 3D computed tomography scan and magnetic resonance imaging) are necessary for proper evaluation and differential diagnosis of spinal tumors in children...
May 2017: Revista da Associação Médica Brasileira
https://www.readbyqxmd.com/read/28723938/gender-differences-in-cerebral-metabolism-for-color-processing-in-mice-a-pet-mri-study
#3
Philip C Njemanze, Mathias Kranz, Mario Amend, Jens Hauser, Hans Wehrl, Peter Brust
INTRODUCTION: Color processing is a central component of mammalian vision. Gender-related differences of color processing revealed by non-invasive functional transcranial Doppler ultrasound suggested right hemisphere pattern for blue/yellow chromatic opponency by men, and a left hemisphere pattern by women. MATERIALS AND METHODS: The present study measured the accumulation of [18F]fluorodeoxyglucose ([18F]FDG) in mouse brain using small animal positron emission tomography and magnetic resonance imaging (PET/MRI) with statistical parametric mapping (SPM) during light stimulation with blue and yellow filters compared to darkness condition...
2017: PloS One
https://www.readbyqxmd.com/read/28723803/leukoencephalopathy-with-calcifications-and-cysts-a-case-report
#4
Yubao Ma, Xingwen Zhang, Chen Cheng, Quangang Xu, Hai Di, Jiao Zhao, Dehui Huang, Shengyuan Yu
RATIONALE: Leukoencephalopathy with calcifications and cysts (LCC) is an uncommon entity characterized by edematous leukoencephalopathy, cerebral calcifications, and parenchymal cysts. Due to its rarity, the clinical, radiological, and histopathological features have yet to be well elucidated. PATIENT CONCERNS: The first case is a 35-year-old female who was asymptomatic. A giant intracranial cyst was incidentally detected radiologically, and it was slowly growing in the recent 10 years...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723787/late-emergence-of-macular-sparing-in-a-stroke-patient-clinical-case-report
#5
Hye-Young Shin, So Hee Kim, Mee Yon Lee, Su Young Kim, Young Chun Lee
RATIONALE: Occlusive cerebrovascular disease is the most common cause of homonymous hemianopia (HH) with macular sparing. PATIENT CONCERNS: A 61-year-old man came to our ophthalmology clinic complaining of right-side hemianopia. Ophthalmic examination, visual field (VF) examination, and brain magnetic resonance imaging (MRI) were performed. DIAGNOSES: He had right HH without macular sparing on the initial VF test. And brain MRI 6 days after the visual symptoms began revealed a left occipital infarction...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723776/a-case-of-idiopathic-hypertrophic-pachymeningitis-presenting-with-chronic-headache-and-multiple-cranial-nerve-palsies-a-case-report
#6
Yuanyuan Huang, Jun Chen, Li Gui
RATIONALE: Idiopathic hypertrophic pachymeningitis (IHP) is a rare condition, characterized by a chronic fibrosing inflammatory process usually involving either the intracranial or spinal dura mater, but rarely both. Here, we report a rare case of IHP affecting both the intracranial and spinal dura mater. We also discussed the diagnosis, management, and outcome of IHP. PATIENT CONCERNS: We reviewed the case of a 60-year-old woman presenting with chronic headache, multiple cranial nerve palsies and gait disturbance...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723750/sphincter-preserving-surgery-for-low-middle-rectal-cancer-can-we-predict-feasibility-with-high-resolution-magnetic-resonance-imaging
#7
Hai-Bin Zhu, Lin Wang, Zi-Yu Li, Xiao-Ting Li, Xiao-Yan Zhang, Ying-Shi Sun
The study proposed to evaluate the feasibility of predicting sphincter-sparing surgery (SSS) preoperatively in low-middle rectal cancer by using magnetic resonance (MR).The study included both retrospective and prospective design. In the retrospective design, the distance from lower edge of tumor to upper margin of the internal sphincter (Dis1) and distance to anal verge (Dis2) were measured on MR, the distance to anal verge recorded by colonoscopy (Dis3) and digital rectal examination (Dis4) were also obtained...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723741/characterization-of-small-%C3%A2-3%C3%A2-cm-hepatic-lesions-with-atypical-enhancement-feature-and-hypointensity-in-hepatobiliary-phase-of-gadoxetic-acid-enhanced-mri-in-cirrhosis-a-stard-compliant-article
#8
Seung Kak Shin, Yun Soo Kim, Seung Joon Choi, Young Sup Shim, Dong Hae Jung, Oh Sang Kwon, Duck Joo Choi, Ju Hyun Kim
It is difficult to characterize the nodular lesions in cirrhotic liver if typical enhancement pattern is not present on dynamic contrast-enhanced imagings. Although the signal intensity of the hepatobiliary phase in gadoxetic acid-enhanced magnetic resonance imaging (MRI) is helpful for characterization of the lesions, some dysplastic nodules may also exhibit low signal intensity in the hepatobiliary phase. We aimed to assess the usefulness of gadoxetic acid (Gd-EOB-DTPA)-enhanced MRI including diffusion-weighted imaging (DWI) for differentiation between atypical small hepatocellular carcinomas (HCCs) and dysplastic nodules showing low signal intensity (SI) in the hepatobiliary phase, and to evaluate the MRI findings in determining the histological grade of atypical HCCs in patients with cirrhosis...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723654/disrupted-small-world-brain-network-topology-in-pure-conduct-disorder
#9
Feng-Mei Lu, Jian-Song Zhou, Jiang Zhang, Xiao-Ping Wang, Zhen Yuan
OBJECTIVES: Conduct disorder (CD) is characterized by the violation of the rights of others or basic social rules and a repetitive, persistent pattern of antisocial and aggressive behaviors. A large number of functional and structural neuroimaging studies have identified widely abnormalities in specific brain regions in CD, but the alterations in the topological organization of functional networks among them remain largely unknown. METHODS: Resting-state functional magnetic resonance imaging was applied to investigate the intrinsic functional connectivity in 18 pure CD patients and eighteen typically developing healthy controls...
July 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28723578/convolutional-neural-network-based-encoding-and-decoding-of-visual-object-recognition-in-space-and-time
#10
REVIEW
K Seeliger, M Fritsche, U Güçlü, S Schoenmakers, J-M Schoffelen, S E Bosch, M A J van Gerven
Representations learned by deep convolutional neural networks (CNNs) for object recognition are a widely investigated model of the processing hierarchy in the human visual system. Using functional magnetic resonance imaging, CNN representations of visual stimuli have previously been shown to correspond to processing stages in the ventral and dorsal streams of the visual system. Whether this correspondence between models and brain signals also holds for activity acquired at high temporal resolution has been explored less exhaustively...
July 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28723288/science-to-practice-can-mr-imaging-cell-tracking-of-macrophage-infiltration-be-used-as-a-predictive-imaging-biomarker-for-transplanted-stem-cell-rejection
#11
Jeff W M Bulte
Ferumoxytol-enhanced magnetic resonance (MR) imaging of donor-matched and mismatched stem cell transplants demonstrated decreased signal intensity not only for a xenogeneic mismatch in species but, surprisingly, also for a syngeneic mismatch in sex. MR imaging findings were corroborated with intravital fluorescence microscopy (IVM), where nearly 90% of all ferumoxytol-containing cells were found to be macrophages. Hence, MR imaging cell tracking of infiltrating macrophages may have predictive value in determining whether transplanted stem cell rejection will occur...
August 2017: Radiology
https://www.readbyqxmd.com/read/28723285/case-244-systemic-amyloidosis-a-complication-of-waldenstr%C3%A3-m-macroglobulinemia
#12
Maja Hrabak-Paar, Marko Kralik
History A 68-year-old man was admitted to the hospital for work-up because of generalized fatigue, anorexia, chronic diarrhea, and weight loss. Laboratory work-up revealed an erythrocyte sedimentation rate of 58 mm/h (reference range, 3-23 mm/h), a hemoglobin level of 14.1 g/dL (reference range, 13.8-17.5 g/dL), a leukocyte count of 8.1 × 10(9)/L (reference range, [3.4-9.7] × 10(9)/L), a platelet count of 223 × 10(9)/L (reference range, [158-424] × 10(9)/L), an alkaline phosphatase level of 85 U/L (1.42 μkat/L) (normal level, <142 U/L [2...
August 2017: Radiology
https://www.readbyqxmd.com/read/28723281/imaging-correlates-of-adult-glioma-genotypes
#13
Marion Smits, Martin J van den Bent
Primary brain tumors, most commonly gliomas, are histopathologically typed and graded as World Health Organization (WHO) grades I-IV according to increasing degrees of malignancy. These grades provide prognostic information and guidance on treatment such as radiation therapy and chemotherapy after surgery. Despite the confirmed value of the WHO grading system, results of a multitude of studies and prospective interventional trials now indicate that tumors with identical morphologic criteria can have highly different outcomes...
August 2017: Radiology
https://www.readbyqxmd.com/read/28723279/magnetization-transfer-imaging-in-treatment-resistant-depression-structural-evidence-of-a-functional-derangement-that-might-help-guide-therapy
#14
Karen Buch, Bernardo Bizzo, Michael H Lev
No abstract text is available yet for this article.
August 2017: Radiology
https://www.readbyqxmd.com/read/28723274/identifying-voxels-at-risk-for-progression-in-glioblastoma-based-on-dosimetry-physiologic-and-metabolic-mri
#15
Mekhail Anwar, Annette M Molinaro, Olivier Morin, Susan M Chang, Daphne A Haas-Kogan, Sarah J Nelson, Janine M Lupo
Despite the longstanding role of radiation in cancer treatment and the presence of advanced, high-resolution imaging techniques, delineation of voxels at-risk for progression remains purely a geometric expansion of anatomic images, missing subclinical disease at risk for recurrence while treating potentially uninvolved tissue and increasing toxicity. This remains despite the modern ability to precisely shape radiation fields. A striking example of this is the treatment of glioblastoma, a highly infiltrative tumor that may benefit from accurate identification of subclinical disease...
July 19, 2017: Radiation Research
https://www.readbyqxmd.com/read/28722701/susceptibility-weighted-with-quantitative-phase-magnetic-resonance-imaging-in-differentiation-of-various-stages-of-hemorrhage-and-calcification-in-female-pelvic-pathologies-a-preliminary-study
#16
Sakshi Khurana, Prativa Sahoo, Mukta Kapila, Swati Mittal, Manavita Mahajan, Indrajit Saha, Rakesh Kumar Gupta
BACKGROUND: The purposes of this study were to assess the value of phase for characterization of female pelvic lesions with hemorrhage in various stages and to differentiate them from calcified lesions at 3.0-T magnetic resonance imaging (MRI). METHODS: Forty-four female patients with hemorrhagic (n = 37) or calcified (n = 7) pelvic pathology underwent conventional MRI including susceptibility-weighted imaging with phase information. Hemorrhagic lesions were grouped into acute, subacute, and chronic, and calcified lesions were detected on the basis of conventional imaging findings...
July 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28722700/detection-of-bone-marrow-edema-pattern-with-dual-energy-computed-tomography-of-the-pig-mandible-treated-with-radiotherapy-and-surgery-compared-with-magnetic-resonance-imaging
#17
Lucas J Poort, Annika A R Stadler, Johan H B Ludlage, Frank J P Hoebers, Peter A W H Kessler, Alida A Postma
OBJECTIVE: The aim of the study was to investigate the accuracy of dual-energy computed tomography (DECT) compared with magnetic resonance (MR) imaging for the detection of edema of the mandible. MATERIALS AND METHODS: Fifteen adult Göttingen mini pigs received irradiation to the mandible with an equivalent dose of 0, 25, 50, or 70 Gy. Six months after irradiation, all animals underwent DECT and MR imaging of the mandible. Magnetic resonance short tau inversion recovery (STIR) was used for the grading of the bone marrow edema (0-3)...
July 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28722699/added-value-of-parotid-r2-values-for-evaluation-of-sj%C3%A3-gren-syndrome-a-preliminary-study
#18
Chen Chu, Nan Zhou, Huayong Zhang, Xin Dou, Ming Li, Song Liu, Jie Wang, Weibo Chen, Queenie Chan, Lingyun Sun, Jian He, Zhengyang Zhou
OBJECTIVE: To explore the application of parotid R2* values for evaluating Sjögren syndrome (SS). METHODS: Twenty-four consecutive SS patients and 24 sex-matched and age-matched healthy volunteers underwent bilateral parotid 3.0 T magnetic resonance (MR) imaging, including blood oxygenation level dependent sequence. Parotid R2* values of SS patients and volunteers were compared. A receiver operating characteristic analysis was used to evaluate the diagnostic performance of parotid R2* value alone and in combination with MR nodular grade...
July 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28722698/magnetic-resonance-imaging-of-parotid-gland-tumors-dynamic-contrast-enhanced-sequence-evaluation
#19
Xavier Stefanovic, Yassine Al Tabaa, Gregory Gascou, Sandy Lacombe, Yves Auge, Philippe Delort, Paul Hagen, Renaud Garrel, Alain Bonafe, Jean-Pierre Daures, Jean-François Vendrell
OBJECTIVE: The aim of the study was to evaluate dynamic contrast-enhanced magnetic resonance (MR) imaging in the characterization of parotid gland tumors. METHODS: Fifty-five parotid lesions in 55 patients were retrospectively included. Two observers interpreted 2 reading protocols derived from all MR imaging in 2 distinct sessions, independently and blinded. Benign versus malignant distinction was carried out for protocol 1 (without contrast administration) and protocol 2 (with dynamic contrast-enhanced sequence)...
July 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28722597/occult-amoebic-liver-abscess-as-cause-of-extensive-inferior-vena-cava-and-hepatic-vein-thrombosis
#20
Leslie Martin, Nishigandha Burute, Ehsan Haider, Pablo E Serrano, Timothy O'Shea, Deborah Siegal
The most common extraintestinal complication of Entamoeba histolytica is amoebic liver abscess (ALA). Hepatic vein and inferior vena cava (IVC) thrombosis are rare but well-documented complications of ALA, typically attributed to mechanical compression and inflammation associated with a large abscess. We present a case of a previously healthy 43-year-old Canadian man presenting with constitutional symptoms and right upper quadrant abdominal pain. He was found to have thrombophlebitis of the IVC, accessory right hepatic vein, and bilateral iliac veins...
July 3, 2017: American Journal of Tropical Medicine and Hygiene
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