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high resolution magnetic resonance imaging

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https://www.readbyqxmd.com/read/28723750/sphincter-preserving-surgery-for-low-middle-rectal-cancer-can-we-predict-feasibility-with-high-resolution-magnetic-resonance-imaging
#1
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/28723578/convolutional-neural-network-based-encoding-and-decoding-of-visual-object-recognition-in-space-and-time
#2
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/28723274/identifying-voxels-at-risk-for-progression-in-glioblastoma-based-on-dosimetry-physiologic-and-metabolic-mri
#3
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/28714120/partial-fourier-techniques-in-single-shot-cross-term-spatiotemporal-encoded-mri
#4
Zhiyong Zhang, Lucio Frydman
PURPOSE: Cross-term spatiotemporal encoding (xSPEN) is a single-shot approach with exceptional immunity to field heterogeneities, the images of which faithfully deliver 2D spatial distributions without requiring a priori information or using postacquisition corrections. xSPEN, however, suffers from signal-to-noise ratio penalties due to its non-Fourier nature and due to diffusion losses-especially when seeking high resolution. This study explores partial Fourier transform approaches that, acting along either the readout or the spatiotemporally encoded dimensions, reduce these penalties...
July 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28714105/spinal-cord-imaging-using-averaged-magnetization-inversion-recovery-acquisitions
#5
Matthias Weigel, Oliver Bieri
PURPOSE: To establish a novel approach for fast high-resolution spinal cord (SC) imaging using averaged magnetization inversion recovery acquisitions (AMIRA). METHODS: The AMIRA concept is based on an inversion recovery (IR) prepared, segmented, and time-limited cine balanced steady state free precession sequence. Typically, for the fastest SC imaging without any signal averaging, eight consecutive images in time with an in-plane resolution of 0.67 × 0.67 mm(2) and 6 mm to 8 mm slice thickness are acquired in 51 s...
July 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28713835/rapid-detection-of-the-mt3243a%C3%A2-%C3%A2-g-mutation-using-urine-sediment-in-elderly-chinese-type-2-diabetic-patients
#6
Yinan Zhang, Xiujuan Du, Xinqian Geng, Chen Chu, Huijuan Lu, Yixie Shen, Ruihua Chen, Pingyan Fang, Yanmei Feng, Xiaojie Zhang, Yan Chen, Yanping Zhou, Congrong Wang, Weiping Jia
OBJECTIVE: In this study, we aimed to identify mt3243A > G mutation carriers in a group of Chinese elderly type 2 diabetic patients by a rapid and noninvasive diagnostic system. METHODS: DNA was extracted from blood, saliva, and urine sediment samples. The mutation screening and quantitation of heteroplasmy were performed by high-resolution melting (HRM) curve and pyrosequencing, respectively. Patients with mt3243A > G mutation underwent a detailed audiometric, ophthalmologic, neurological, and cardiac examination...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28709718/gadoxetic-acid-enhanced-high-temporal-resolution-hepatic-arterial-phase-imaging-with-view-sharing-technique-impact-on-the-li-rads-category
#7
Satoshi Goshima, Yoshifumi Noda, Kimihiro Kajita, Nobuyuki Kawai, Hiromi Koyasu, Hiroshi Kawada, Masayuki Matsuo, Kyongtae T Bae
PURPOSE: To evaluate the value of view-sharing multi-hepatic arterial-phase (mHAP) imaging for diagnosis of hypervascular hepatocellular carcinoma (HCC). MATERIALS AND METHODS: Forty-seven consecutive patients with HCC underwent gadoxetic acid-enhanced magnetic resonance (MR) imaging before angiographic and lipiodol CT. Hepatic arterial-phase images were obtained at 5 consecutive phases with shared central k-space of 25%, followed by portal venous, late (2 and 3min), and hepatobiliary phase imaging...
July 3, 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28709465/subclinical-focal-cholangitis-mimicking-liver-metastasis-in-asymptomatic-patients-with-history-of-pancreatic-ductal-adenocarcinoma-and-biliary-tree-intervention
#8
Natally Horvat, Edmund M Godfrey, Timothy J Sadler, Jaclyn F Hechtman, Laura H Tang, Carlie S Sigel, Serena Monti, Lorenzo Mannelli
BACKGROUND: Cholangitis is an inflammatory process of the biliary tract with a wide range of clinical manifestations and it is not always considered in the differential diagnosis in asymptomatic patients. To the best of our knowledge there is no previous report in the English literature of focal cholangitis manifesting exclusively as liver parenchymal changes mimicking liver metastasis in asymptomatic patients with pancreatic ductal adenocarcinoma (PDAC) and history of manipulation of the biliary tree...
July 14, 2017: Cancer Imaging: the Official Publication of the International Cancer Imaging Society
https://www.readbyqxmd.com/read/28707958/gadofosveset-enhanced-thoracic-mr-venography-a-comparative-study-evaluating-steady-state-imaging-versus-conventional-first-pass-time-resolved-dynamic-imaging
#9
Teik C See, Andrew J Patterson, Nicholas J Hilliard, Ed Soh, Andrew P Winterbottom, Ilse Patterson, Richard A Parker, Martin J Graves, David J Lomas
Background Dedicated blood-pool contrast agents combined with optimal angiographic protocols could improve the diagnostic accuracy of thoracic magnetic resonance angiography (MRA). Purpose To assess the clinical utility of Gadofesveset-enhanced imaging and compare an optimized steady-state (SS) sequence against conventional first-pass dynamic multi-phase (DMP) imaging. Material and Methods Twenty-nine patients (17 men, 12 women; mean age = 42.7, age range = 18-72 years) referred for MR thoracic venography were recruited...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28707187/imaging-in-vascular-access
#10
Eoin A Murphy, Rose A Ross, Robert G Jones, Stephen J Gandy, Nicolas Aristokleous, Marco Salsano, Jonathan R Weir-McCall, Shona Matthew, John Graeme Houston
This review examines four imaging modalities; ultrasound (US), digital subtraction angiography (DSA), magnetic resonance imaging (MRI) and computed tomography (CT), that have common or potential applications in vascular access (VA). The four modalities are reviewed under their primary uses, techniques, advantages and disadvantages, and future directions that are specific to VA. Currently, US is the most commonly used modality in VA because it is cheaper (relative to other modalities), accessible, non-ionising, and does not require the use of contrast agents...
July 13, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28706767/surgical-excision-of-a-symptomatic-thoracic-nerve-root-perineural-cyst-resulting-in-complete-resolution-of-symptoms-a-case-report
#11
Zaid Aljuboori, Alae Yaseen, Jessica Simpson, Maxwell Boakye
Tarlov (perineural) cysts of the nerve root are common and usually incidental findings during magnetic resonance imaging (MRI) of the lumbosacral spine. There are a few case reports where symptomatic thoracic perineural cysts have been described in the literature. We report a case of a high thoracic nerve root perineural cyst that failed conservative therapy, requiring surgical intervention. Our patient presented with radicular symptoms involving the left hand. Imaging workup revealed a cystic lesion of the left T1 nerve root at the level of the foramen...
June 12, 2017: Curēus
https://www.readbyqxmd.com/read/28706481/adverse-effects-of-the-apolipoprotein-e-%C3%AE%C2%B54-allele-on-episodic-memory-task-switching-and-gray-matter-volume-in-healthy-young-adults
#12
Jianfei Nao, Hongzan Sun, Qiushi Wang, Shuang Ma, Shuo Zhang, Xiaoyu Dong, Ying Ma, Xiaoming Wang, Dongming Zheng
Many studies have shown that healthy elderly subjects and patients with Alzheimer's disease (AD) who carry the apolipoprotein E (ApoE) ε4 allele have worse cognitive function and more severe brain atrophy than non-carriers. However, it remains unclear whether this ApoE polymorphism leads to changes of cognition and brain morphology in healthy young adults. In this study, we used an established model to measure verbal episodic memory and core executive function (EF) components (response inhibition, working memory and task switching) in 32 ApoE ε4 carriers and 40 non-carriers between 20 years and 40 years of age...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28705371/magnetic-resonance-neurography-of-the-pelvic-nerves
#13
Eric Weissman, Ethan Boothe, Vibhor Wadhwa, Kelly Scott, Avneesh Chhabra
Chronic pelvic pain syndrome is commonly caused by nerve injury, inflammation, or entrapment. Owing to the complex anatomy and branching patterns of pelvic nerves, pelvic neuropathies are often difficult to illustrate and diagnose. High-resolution 3-T magnetic resonance neurography is a promising technique for the evaluation of peripheral neuropathy. In this article, the authors discuss the normal anatomy of major pelvic nerves, technical considerations of high-resolution imaging, and normal and abnormal imaging appearances with relevant case examples...
June 2017: Seminars in Ultrasound, CT, and MR
https://www.readbyqxmd.com/read/28705368/imaging-of-pelvic-floor-reconstruction
#14
Roopa Ram, Sallie S Oliphant, Susan A Barr, Tarun Pandey
Stress urinary incontinence and pelvic organ prolapse are 2 common pelvic floor disorders that are important causes of pelvic pain and disability. Mesh and sling placement are some of the surgical treatment options available for treatment of these conditions. In addition to clinical assessment, imaging plays an important role in managing postoperative patients with complications such as recurrent organ prolapse and chronic pain. Role of high-resolution pelvic magnetic resonance imaging with additional advanced imaging techniques, such as magnetic resonance neurography that are invaluable in managing such patients, are discussed in this article...
June 2017: Seminars in Ultrasound, CT, and MR
https://www.readbyqxmd.com/read/28703103/shining-light-in-a-dark-landscape-mri-evaluation-of-unusual-localization-of-endometriosis
#15
Benedetta Gui, Anna Lia Valentini, Valeria Ninivaggi, Maura Miccò, Viola Zecchi, Pier Paolo Grimaldi, Francesco Cambi, Maurizio Guido, Lorenzo Bonomo
Endometriosis is a disease distinguished by the presence of endometrial tissue outside the uterine cavity with intralesional recurrent bleeding and resulting fibrosis. The most common locations for endometriosis are the ovaries, pelvic peritoneum, uterosacral ligaments, and torus uterinus. Typical symptoms are secondary dysmenorrhea and cyclic or chronic pelvic pain. Unusual sites of endometriosis may be associated with specific symptoms depending on the localization. Atypical pelvic endometriosis localizations can occur in the cervix, vagina, round ligaments, ureter, and nerves...
July 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28700819/posterior-dopamine-d2-3-receptors-and-brain-network-functional-connectivity
#16
Atsuko Nagano-Saito, Jennifer I Lissemore, Paul Gravel, Marco Leyton, Felix Carbonell, Chawki Benkelfat
Recent studies suggest that dopaminergic tone influences resting state activity in multiple brain networks. Although dopamine receptors and transporters have been identified in the posteromedial and parietal cortices, which are linked to functional networks such as the default mode network (DMN), the relationship between dopamine receptor distribution in these posterior regions and resting-state connectivity has yet to be explored. Here, we used a multi-modal neuroimaging strategy, combining resting-state functional magnetic resonance imaging (rsfMRI) and [18F]-fallypride high-resolution positron emission tomography (PET), to examine the association between within-network functional connectivity and the dopamine D2/3 receptor distribution in the posterior portion of the brain in 13 healthy adults...
July 12, 2017: Synapse
https://www.readbyqxmd.com/read/28699182/amygdala-and-hippocampus-volumes-are-differently-affected-by-childhood-trauma-in-patients-with-bipolar-disorders-and-healthy-controls
#17
Delfina Janiri, Gabriele Sani, Pietro De Rossi, Fabrizio Piras, Mariangela Iorio, Nerisa Banaj, Giulia Giuseppin, Edoardo Spinazzola, Matteo Maggiora, Elisa Ambrosi, Alessio Simonetti, Gianfranco Spalletta
OBJECTIVES: Volumetric studies on deep gray matter structures in bipolar disorder (BP) have reported contrasting results. Childhood trauma, a relevant environmental stressor for BP, could account for the variability of the results, modulating differences in the amygdala and hippocampus in patients with BP compared with healthy controls (HC). Our study aimed to test this hypothesis. METHODS: We assessed 105 outpatients, diagnosed with bipolar disorder type I (BP-I) or bipolar disorder type II (BP-II) according to DSM-IV-TR criteria, and 113 HC subjects...
July 12, 2017: Bipolar Disorders
https://www.readbyqxmd.com/read/28697434/modelling-of-compressible-and-orthotropic-surgical-mesh-implants-based-on-optical-deformation-measurement
#18
Andreas J Horbach, Minh Tuan Duong, Manfred Staat
There is a potential mismatch between surgical mesh implants for hernia repair of pelvic floor surgery and the host tissue because soft tissue is incompressible and meshes are compressible. Therefore, mesh and tissue may develop different stiffness over the range of deformation. In addition compressibility is related to a change of porosity of the mesh which may decrease during the deformation. Scar formation and the ingrowth of the mesh can be related to effective porosity which decreases discontinuously in uniaxial loading at a critical stretch when pore areas collapse and therefore the mesh becomes ineffective...
June 12, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28695759/diffusion-tensor-imaging-findings-suggestive-of-white-matter-alterations-in-a-canine-model-of-mucopolysaccharidosis-type-i
#19
Dana M Middleton, Jonathan Y Li, Steven D Chen, Leonard E White, Patricia Dickson, N Matthew Ellinwood, James M Provenzale
Purpose We investigated fractional anisotropy (FA) and radial diffusivity (RD) in a canine model of mucopolysaccharidosis (MPS). We hypothesized that canines affected with MPS would exhibit decreased FA and increased RD values when compared to unaffected canines, a trend that has been previously described in humans with white matter diseases. Methods Four unaffected canines and two canines with MPS were euthanized at 18 weeks of age. Their brains were imaged using high-resolution diffusion tensor imaging (DTI) on a 7T small-animal magnetic resonance imaging system...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28695757/association-between-snoring-and-high-risk-carotid-plaque-features
#20
Erin M Kirkham, Thomas S Hatsukami, Susan R Heckbert, Jie Sun, Gador Canton, Chun Yuan, Edward M Weaver
Objectives Previous studies have demonstrated an association between snoring and carotid disease independent of sleep apnea. The aim of this study was to quantify the association between self-reported snoring and high-risk carotid plaque features on magnetic resonance imaging (MRI) that predict stroke. Study Design Cross-sectional. Setting Tertiary care university hospital and affiliated county hospital. Methods We surveyed 133 subjects with asymptomatic carotid artery disease that had been previously evaluated with high-resolution MRI...
July 1, 2017: Otolaryngology—Head and Neck Surgery
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