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MR image segmentation

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https://www.readbyqxmd.com/read/28634148/iodine-and-freeze-drying-enhanced-high-resolution-microct-imaging-for-reconstructing-3d-intraneural-topography-of-human-peripheral-nerve-fascicles
#1
Liwei Yan, Yongze Guo, Jian Qi, Qingtang Zhu, Liqiang Gu, Canbin Zheng, Tao Lin, Yutong Yu, Zitao Zeng, Sha Yu, Shuang Zhu, Xiang Zhou, Xi Zhang, Yunfei Du, Zhi Yao, Yao Lu, Xiaolin Liu
BACKGROUND: The precise annotation and accurate identification of the topography of fascicles to the end organs are prerequisites for studying human peripheral nerves. NEW METHOD: In this study, we present a feasible imaging method that acquires 3D high-resolution (HR) topography of peripheral nerve fascicles using an iodine and freeze-drying (IFD) micro-computed tomography (microCT) method to greatly increase the contrast of fascicle images. RESULTS: The enhanced microCT imaging method can facilitate the reconstruction of high-contrast HR fascicle images, fascicle segmentation and extraction, feature analysis, and the tracing of fascicle topography to end organs, which define fascicle functions...
June 17, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28632492/is-the-location-of-the-signal-intensity-weighted-centroid-a-reliable-measurement-of-fluid-displacement-within-the-disc
#2
Vahid Abdollah, Eric C Parent, Michele C Battié
Degenerated discs have shorter T2-relaxation time and lower MR signal. The location of the signal-intensity-weighted-centroid reflects the water distribution within a region-of-interest (ROI). This study compared the reliability of the location of the signal-intensity-weighted-centroid to mean signal intensity and area measurements. L4-L5 and L5-S1 discs were measured on 43 mid-sagittal T2-weighted 3T MRI images in adults with back pain. One rater analysed images twice and another once, blinded to measurements...
June 20, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28626021/acute-segmental-poliomyelitis-like-flaccid-paralysis-in-an-adult-in-the-uk-associated-with-enterovirus-d68
#3
Sybil R L Stacpoole, Adam Molyneux, Dirk Bäumer
Enterovirus D68 has been associated with a poliomyelitis-like illness, notably during an outbreak in 2014, and particularly affecting children in the USA. We report a case of acute segmental flaccid paralysis with respiratory involvement in an adult in the UK, with enterovirus D68 detected in a sputum sample. MR imaging of cervical spinal cord showed a longitudinally extensive T2 hyperintensity in the anterior cord. Cerebrospinal fluid showed an elevated white cell count, predominantly lymphocytic, with otherwise normal constituents and negative viral PCRs...
June 16, 2017: Practical Neurology
https://www.readbyqxmd.com/read/28620752/fatty-metaplasia-quantification-and-impact-on-regional-myocardial-function-as-assessed-by-advanced-cardiac-mr-imaging
#4
Tomas Lapinskas, Bernhard Schnackenburg, Marc Kouwenhoven, Rolf Gebker, Alexander Berger, Remigijus Zaliunas, Burkert Pieske, Sebastian Kelle
OBJECTIVE: This study aimed to investigate the advantages of recently developed cardiac imaging techniques of fat-water separation and feature tracking to characterize better individuals with chronic myocardial infarction (MI). MATERIALS AND METHODS: Twenty patients who had a previous MI underwent CMR imaging. The study protocol included routine cine and late gadolinium enhancement (LGE) technique. In addition, mDixon LGE imaging was performed in every patient. Left ventricular (LV) circumferential (EccLV) and radial (ErrLV) strain were calculated using dedicated software (CMR(42), Circle, Calgary, Canada)...
June 15, 2017: Magma
https://www.readbyqxmd.com/read/28616928/-clinical-study-of-rs-epi-dwi-to-improve-imaging-quality-and-assessment-on-intracranial-mass-lesions
#5
Kai Zhang, Chun-Chao Xia, Qiang Yue, Tao Guo, Wan-Lin Peng, Yu-Ming Li, Lei Li, Fei Zhao, Jin Pu, Qi Leng, Zhen-Lin Li
OBJECTIVES: To explore the clinical value of readout-segmented echo planar imaging (Rs-EPI) sequence in the assessment of intracranial mass lesions compared to the standard single-shot EPI (Ss-EPI) sequence. METHODS: We included 21 patients with intracranial mass lesions who underwent both Ss-EPI diffusion weighted imaging (DWI) and Rs-EPI DWI at 3.0T MR scanner with a twenty-channel head-neck coil. The quality of images was assessed by two experienced radiologists independently...
May 2017: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
https://www.readbyqxmd.com/read/28603789/segmentation-of-perivascular-spaces-using-vascular-features-and-structured-random-forest-from-7t-mr-image
#6
Jun Zhang, Yaozong Gao, Sang Hyun Park, Xiaopeng Zong, Weili Lin, Dinggang Shen
Quantitative analysis of perivascular spaces (PVSs) is important to reveal the correlations between cerebrovascular lesions and neurodegenerative diseases. In this study, we propose a learning-based segmentation framework to extract the PVSs from high-resolution 7T MR images. Specifically, we integrate three types of vascular filter responses into a structured random forest for classifying voxels into PVS and background. In addition, we also propose a novel entropy-based sampling strategy to extract informative samples in the background for training the classification model...
October 2016: Machine Learning in Medical Imaging
https://www.readbyqxmd.com/read/28602884/autostereoscopic-3d-neuronavigation-to-the-sella-technical-note
#7
A Nimer Amr, Jens Conrad, Sven Kantelhardt, Alf Giese
BACKGROUND: A drawback of conventional neuronavigation is the necessity of focusing on 2D-images in three planes at the same time to determine one's position in the operation field. A solution would be to merge the images into a single 3D-image that mirrors the actual anatomy. This solution has hitherto been hindered by technical limitations. The introduction of holographic-glassless 3D-monitors paved the way to 3D-navigation. OBJECTIVE: We present our experience with 3D-neuronavigation as exemplified by navigation to and within the sella...
June 5, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28602597/performance-comparison-of-10-different-classification-techniques-in-segmenting-white-matter-hyperintensities-in-aging
#8
Mahsa Dadar, Josefina Maranzano, Karen Misquitta, Cassandra J Anor, Vladimir S Fonov, M Carmela Tartaglia, Owen T Carmichael, Charles Decarli, D Louis Collins
INTRODUCTION: White matter hyperintensities (WMHs) are areas of abnormal signal on magnetic resonance images (MRIs) that characterize various types of histopathological lesions. The load and location of WMHs are important clinical measures that may indicate the presence of small vessel disease in aging and Alzheimer's disease (AD) patients. Manually segmenting WMHs is time consuming and prone to inter-rater and intra-rater variabilities. Automated tools that can accurately and robustly detect these lesions can be used to measure the vascular burden in individuals with AD or the elderly population in general...
June 10, 2017: NeuroImage
https://www.readbyqxmd.com/read/28600641/predicting-deletion-of-chromosomal-arms-1p-19q-in-low-grade-gliomas-from-mr-images-using-machine-intelligence
#9
Zeynettin Akkus, Issa Ali, Jiří Sedlář, Jay P Agrawal, Ian F Parney, Caterina Giannini, Bradley J Erickson
Several studies have linked codeletion of chromosome arms 1p/19q in low-grade gliomas (LGG) with positive response to treatment and longer progression-free survival. Hence, predicting 1p/19q status is crucial for effective treatment planning of LGG. In this study, we predict the 1p/19q status from MR images using convolutional neural networks (CNN), which could be a non-invasive alternative to surgical biopsy and histopathological analysis. Our method consists of three main steps: image registration, tumor segmentation, and classification of 1p/19q status using CNN...
June 9, 2017: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
https://www.readbyqxmd.com/read/28592709/relationship-between-contrast-enhancement-of-the-perivascular-space-in-the-basal-ganglia-and-endolymphatic-volume-ratio
#10
Toshio Ohashi, Shinji Naganawa, Toshio Katagiri, Kayao Kuno
PURPOSE: We routinely obtain the endolymphatic hydrops (EH) image using heavily T2-weighted three dimensional-fluid attenuated inversion recovery (hT2w-3D-FLAIR) imaging at 4 hours after intravenous administration of a single-dose of gadolinium-based contrast media (IV-SD-GBCM). While repeating the examination, we speculated that the contrast enhancement of the perivascular space (PVS) in the basal ganglia might be related to the degree of EH. Therefore, the purpose of this study was to investigate the relationship between the endolymphatic volume ratio (%ELvolume) and the signal intensity of the PVS (SI-PVS)...
June 8, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28590771/non-contrast-mr-angiography-using-three-dimensional-balanced-steady-state-free-precession-imaging-for-evaluation-of-stenosis-in-the-celiac-trunk-and-superior-mesenteric-artery-a-preliminary-comparative-study-with-computed-tomography-angiography
#11
Patricia Prando Cardia, Thiago José Penachim, Adilson Prando, Ulysses S Torres, Giuseppe D'Ippólito
OBJECTIVES: Although non-contrast magnetic resonance angiography (NC-MRA) is well established for the evaluation of renal artery stenosis, its usefulness in the evaluation of other abdominal aortic branches remains to be studied. This study aimed at evaluating the image quality and diagnostic accuracy of NC-MRA using a three-dimensional balanced steady-state free precession sequence (bSSFP) in identifying stenosis in the celiac trunk and superior mesenteric artery as compared to computed tomography angiography (CTA) as the reference standard...
June 7, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28583643/utility-of-t1-weighted-mri-as-a-predictor-of-liver-lesion-visibility-on-ultrasound-a-clinical-tool-to-determine-feasibility-of-ultrasound-guided-percutaneous-interventions
#12
Timothy L Miao, Ania Z Kielar, Rebecca M Hibbert, Nicola Schieda
PURPOSE: To determine the utility of fat-suppressed T1-weighted gradient recalled echo (FS-T1W-GRE) MRI to predict visibility of focal liver lesions (FLL) on abdominal ultrasound (US). MATERIALS AND METHODS: With IRB approval, between 2010 and 2013, 109 patients (28.4% females, age 66.9±10.9years) with 177 FLL (hepatocellular carcinoma=132, metastases=44, other=1) underwent MRI and prospective, radiologist-performed treatment-planning US (to determine eligibility for US-guided ablation)...
May 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28580377/optimization-of-curvilinear-needle-trajectories-for-transforamenal-hippocampotomy
#13
David B Comber, E Bryn Pitt, Hunter B Gilbert, Matthew W Powelson, Emily Matijevich, Joseph S Neimat, Robert J Webster, Eric J Barth
BACKGROUND: The recent development of MRI-guided laser-induced thermal therapy (LITT) offers a minimally invasive alternative to craniotomies performed for tumor resection or for amygdalohippocampectomy to control seizure disorders. Current LITT therapies rely on linear stereotactic trajectories that mandate twist-drill entry into the skull and potentially long approaches traversing healthy brain. The use of robotically-driven, telescoping, curved needles has the potential to reduce procedure invasiveness by tailoring trajectories to the curved shape of the ablated structure and by enabling access through natural orifices...
February 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28578128/an-ontologically-consistent-mri-based-atlas-of-the-mouse-diencephalon
#14
Charles Watson, Andrew L Janke, Carlo Hamalainen, Shahrzad M Bagheri, George Paxinos, David C Reutens, Jeremy F P Ullmann
In topological terms, the diencephalon lies between the hypothalamus and the midbrain. It is made up of three segments, prosomere 1 (pretectum), prosomere 2 (thalamus), and prosomere 3 (the prethalamus). A number of MRI-based atlases of different parts of the mouse brain have already been published, but none of them displays the segments the diencephalon and their component nuclei. In this study we present a new volumetric atlas identifying 89 structures in the diencephalon of the male C57BL/6J 12 week mouse...
May 31, 2017: NeuroImage
https://www.readbyqxmd.com/read/28574809/testicular-seminoma-and-its-mimics
#15
Jamie Marko, Darcy J Wolfman, Alex L Aubin, Isabell A Sesterhenn
Testicular seminoma is the most common malignant tumor of the testis. It classically manifests as a painless mass. Radiologic evaluation with high-frequency ultrasonography (US) is critical for diagnosis. Seminomas are usually homogeneously hypoechoic masses at US. In challenging cases, magnetic resonance (MR) imaging may help confirm that a mass is intratesticular and provide data for local staging. Computed tomography (CT) provides valuable information for staging, including the presence and size of retroperitoneal lymph nodes...
June 2, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28574348/direct-multitype-cardiac-indices-estimation-via-joint-representation-and-regression-learning
#16
Wufeng Xue, Ali Islam, Mousumi Bhaduri, Shuo Li
Cardiac indices estimation is of great importance during identification and diagnosis of cardiac disease in clinical routine. However, estimation of multitype cardiac indices with consistently reliable and high accuracy is still a great challenge due to the high variability of cardiac structures and complexity of temporal dynamics in cardiac MR sequences. While efforts have been devoted into cardiac volumes estimation through feature engineering followed by a independent regression model, these methods suffer from the vulnerable feature representation and incompatible regression model...
May 26, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28572152/temporal-evolution-of-disc-in-young-patients-with-low-back-pain-and-stress-reaction-in-lumbar-vertebrae
#17
A Sharma, K Sargar, A Salter
BACKGROUND AND PURPOSE: Although stress-induced bony changes often resolve with conservative treatment, the long-term effects of such mechanical stresses on intervertebral discs have not been studied. We aimed to assess the differences in the temporal evolution of disc in segments of the lumbar spine with and without signs of increased mechanical stresses. MATERIALS AND METHODS: Using MR imaging performed >6 months apart, 2 radiologists evaluated lumbar intervertebral discs for degenerative changes affecting the annulus fibrosus, the nucleus pulposus, and the endplates in 42 patients (22 male, 20 female; mean age, 16...
June 1, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28570262/automatized-spleen-segmentation-in-non-contrast-enhanced-mr-volume-data-using-subject-specific-shape-priors
#18
Oliver Gloger, Klaus Tönnies, Robin Bülow, Henry Voelzke
To develop the first fully automated 3D spleen segmentation framework derived from T1-weighted magnetic resonance (MR) imaging data; and to verify its performance for spleen delineation and volumetry. This approach considers the issue of low contrast between spleen and adjacent tissue in non-contrast-enhanced MR images. Materials and Methods: Native T1-weighted MR volume data was performed on a 1.5 Tesla MR system in an epidemiological study. We analyzed random subsamples of MR examinations without pathologies to develop and verify the spleen segmentation framework...
June 1, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28567306/mr-micro-neurography-and-a-segmentation-protocol-applied-to-diabetic-neuropathy
#19
P F Felisaz, G Maugeri, V Busi, R Vitale, F Balducci, S Gitto, P Leporati, A Pichiecchio, M Baldi, F Calliada, L Chiovato, S Bastianello
The aim of this study was to assess with MRI morphometric ultrastructural changes in nerves affected by diabetic peripheral neuropathy (DPN). We used an MR micro-neurography imaging protocol and a semiautomated technique of tissue segmentation to visualize and measure the volume of internal nerve components, such as the epineurium and nerve fascicles. The tibial nerves of 16 patients affected by DPN and of 15 healthy volunteers were imaged. Nerves volume (NV), fascicles volume (FV), fascicles to nerve ratio (FNR), and nerves cross-sectional areas (CSA) were obtained...
2017: Radiology Research and Practice
https://www.readbyqxmd.com/read/28562203/is-hepatic-triglyceride-content-associated-with-aortic-pulse-wave-velocity-and-carotid-intima-media-thickness-the-netherlands-epidemiology-of-obesity-study
#20
Ralph L Widya, Renée de Mutsert, Jos J M Westenberg, Karin B Gast, Martin den Heijer, Saskia le Cessie, Johannes W A Smit, J Wouter Jukema, Frits R Rosendaal, Albert de Roos, Hildo J Lamb
Purpose To test the hypothesis that hepatic triglyceride content is associated with subclinical vascular impairment and is not confounded by various cardiometabolic risk factors. Materials and Methods This study was approved by the institutional review board, and all participants gave written informed consent. In this cross-sectional analysis of baseline measurements of the Netherlands Epidemiology of Obesity study, a population-based cohort study, 1899 participants (52% men; mean age, 55 years ± 6 [standard deviation]) underwent magnetic resonance (MR) spectroscopy and MR imaging to assess hepatic triglyceride content, aortic pulse wave velocity (PWV), and visceral fat...
May 29, 2017: Radiology
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