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MR image segmentation

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https://www.readbyqxmd.com/read/29774599/deep-convolutional-neural-network-for-segmentation-of-knee-joint-anatomy
#1
Zhaoye Zhou, Gengyan Zhao, Richard Kijowski, Fang Liu
PURPOSE: To describe and evaluate a new segmentation method using deep convolutional neural network (CNN), 3D fully connected conditional random field (CRF), and 3D simplex deformable modeling to improve the efficiency and accuracy of knee joint tissue segmentation. METHODS: A segmentation pipeline was built by combining a semantic segmentation CNN, 3D fully connected CRF, and 3D simplex deformable modeling. A convolutional encoder-decoder network was designed as the core of the segmentation method to perform high resolution pixel-wise multi-class tissue classification for 12 different joint structures...
May 17, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29772066/3d-specific-absorption-rate-estimation-from-high-intensity-focused-ultrasound-sonications-using-the-green-s-function-heat-kernel
#2
Nicholas J Freeman, Henrik Odéen, Dennis L Parker
PURPOSE: Evaluate a numerical inverse Green's function method of deriving specific absorption rates (SARs) from high intensity focused ultrasound (HIFU) sonications given tissue parameters (thermal conductivity, specific heat capacity, and mass density) and 3-D magnetic resonance imaging (MRI) temperature measurements. METHODS: SAR estimates were evaluated using simulations and MR temperature measurements from HIFU sonications. For simulations, a "true" SAR was calculated using the hybrid angular spectrum method for ultrasound simulations...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29762091/rapid-automated-quantification-of-cerebral-leukoaraiosis-on-ct-images-a-multicenter-validation-study
#3
Liang Chen, Anoma Lalani Carlton Jones, Grant Mair, Rajiv Patel, Anastasia Gontsarova, Jeban Ganesalingam, Nikhil Math, Angela Dawson, Basaam Aweid, David Cohen, Amrish Mehta, Joanna Wardlaw, Daniel Rueckert, Paul Bentley
Purpose To validate a random forest method for segmenting cerebral white matter lesions (WMLs) on computed tomographic (CT) images in a multicenter cohort of patients with acute ischemic stroke, by comparison with fluid-attenuated recovery (FLAIR) magnetic resonance (MR) images and expert consensus. Materials and Methods A retrospective sample of 1082 acute ischemic stroke cases was obtained that was composed of unselected patients who were treated with thrombolysis or who were undergoing contemporaneous MR imaging and CT, and a subset of International Stroke Thrombolysis-3 trial participants...
May 15, 2018: Radiology
https://www.readbyqxmd.com/read/29761595/radiomics-analysis-of-apparent-diffusion-coefficient-in-cervical-cancer-a-preliminary-study-on-histological-grade-evaluation
#4
Ying Liu, Yuwei Zhang, Runfen Cheng, Shichang Liu, Fangyuan Qu, Xiaoyu Yin, Qin Wang, Bohan Xiao, Zhaoxiang Ye
BACKGROUND: The role of apparent diffusion coefficient (ADC)-based radiomics features in evaluating histopathological grade of cervical cancer is unresolved. PURPOSE: To determine if there is a difference between radiomics features derived from center-slice 2D versus whole-tumor volumetric 3D for ADC measurements in patients with cervical cancer regarding tumor histopathological grade, and systematically assess the impact of the b value on radiomics analysis in ADC quantifications...
May 14, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29754161/motion-corrected-whole-heart-pet-mr-for-the-simultaneous-visualisation-of-coronary-artery-integrity-and-myocardial-viability-an-initial-clinical-validation
#5
Camila Munoz, Karl P Kunze, Radhouene Neji, Teresa Vitadello, Christoph Rischpler, René M Botnar, Stephan G Nekolla, Claudia Prieto
PURPOSE: Cardiac PET-MR has shown potential for the comprehensive assessment of coronary heart disease. However, image degradation due to physiological motion remains a challenge that could hinder the adoption of this technology in clinical practice. The purpose of this study was to validate a recently proposed respiratory motion-corrected PET-MR framework for the simultaneous visualisation of myocardial viability (18 F-FDG PET) and coronary artery anatomy (coronary MR angiography, CMRA) in patients with chronic total occlusion (CTO)...
May 12, 2018: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29751180/radiographic-study-of-lumbar-sympathetic-trunk-in-the-oblique-lateral-interbody-fusion-surgery
#6
Hongli Wang, Yuxuan Zhang, Xiaosheng Ma, Xinlei Xia, Feizhou Lu, Jianyuan Jiang
BACKGROUND: Oblique lateral interbody fusion (OLIF) surgery provides a convenient and minimal access to the lesion disc with few complications, however, the left lumbar sympathetic trunk (LST) lies in the surgical field with an certain incidence of injury. The aim of this study was to describe the anatomical structures of the left LST at risk for injury during oblique lateral interbody fusion at different lumbar segment levels based on radiological evaluations. METHODS: 44 healthy young people (22 males and 22 females) were recruited and routine lumbar MR radiograph were performed...
May 8, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29748200/extent-of-microstructural-tissue-damage-correlates-with-hemodynamic-failure-in-high-grade-carotid-occlusive-disease-an-mri-study-using-quantitative-t2-and-dsc-perfusion
#7
A Seiler, R Deichmann, U Nöth, A Lauer, W Pfeilschifter, O C Singer, M Wagner
BACKGROUND AND PURPOSE: Chronic hemodynamic impairment in high-grade carotid occlusive disease is thought to cause microstructural abnormalities that might be subclinical or lead to subtle symptoms including cognitive impairment. Quantitative MR imaging allows assessing pathologic structural changes beyond macroscopically visible tissue damage. In this study, high-resolution quantitative T2 mapping combined with DSC-based PWI was used to investigate quantitative T2 changes as a potential marker of microstructural damage in relation to hemodynamic impairment in patients with unilateral high-grade carotid occlusive disease...
May 10, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29745510/-detection-algorithm-of-amyloid-%C3%AE-protein-deposition-in-magnetic-resonance-image-based-on-pixel-feature-learning-method
#8
Fang Yan, Yongming Li, Xueru Zhu, Jie Wang, Pin Wang, Fan Li, Mingguo Qiu, Jian Qin
Amyloid β-protein (Aβ) deposition is an important prevention and treatment target for Alzheimer's disease (AD), and early detection of Aβ deposition in the brain is the key to early diagnosis of AD. Magnetic resonance imaging (MRI) is the perfect imaging technology for the clinical diagnosis of AD, but it cannot display the plaque deposition directly. In this paper, based on two feature selection modes-filter and wrapper, chain-like agent genetic algorithm (CAGA), principal component analysis (PCA), support vector machine (SVM) and random forest (RF), we designed six kinds of feature learning classification algorithms to detect the information (distribution) of Aβ deposition through magnetic resonance image pixels selection...
June 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29736846/diagnostic-accuracy-of-ce-ct-mri-and-fdg-pet-ct-for-detecting-colorectal-cancer-liver-metastases-in-patients-considered-eligible-for-hepatic-resection-and-or-local-ablation
#9
Kim Sivesgaard, Lars P Larsen, Michael Sørensen, Stine Kramer, Sven Schlander, Nerijus Amanavicius, Arindam Bharadwaz, Dennis Tønner Nielsen, Frank Viborg Mortensen, Erik Morre Pedersen
PURPOSE: To compare the diagnostic performance of contrast-enhanced computed tomography (CE-CT), magnetic resonance imaging (MRI) and combined fluorodeoxyglucose/positron emission tomography/computed tomography (FDG-PET/CT) for detection of colorectal liver metastases (CRLM) in patients eligible for local treatment. MATERIALS AND METHODS: This health-research ethics-committee-approved prospective consecutive diagnostic accuracy study, with written informed consent, included 80 cases (76 patients, four participating twice) between 29 June 2015 and 7 February 2017...
May 7, 2018: European Radiology
https://www.readbyqxmd.com/read/29732609/diffusion-tensor-imaging-of-human-achilles-tendon-by-stimulated-echo-readout-segmented-epi-ste-rs-epi
#10
Kenneth Wengler, Dharmesh Tank, Takeshi Fukuda, James M Paci, Mingqian Huang, Mark E Schweitzer, Xiang He
PURPOSE: Healing, regeneration, and remodeling of the injured Achilles tendon are associated with notable changes in tendon architecture. However, assessing Achilles microstructural properties with conventional diffusion tension imaging (DTI) remains a challenge because of very short T2 / T2* values of the tendon. Hence, the objective of this study was to develop a novel Achilles tendon DTI protocol for a non-invasive investigation of the changes of microstructural integrity in tendinopathy...
May 6, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29728901/multi-ray-medical-ultrasound-simulation-without-explicit-speckle-modelling
#11
Mert Tuzer, Abdulkadir Yazıcı, Rüştü Türkay, Michael Boyman, Burak Acar
PURPOSE: To develop a medical ultrasound (US) simulation method using T1-weighted magnetic resonance images (MRI) as the input that offers a compromise between low-cost ray-based and high-cost realistic wave-based simulations. METHODS: The proposed method uses a novel multi-ray image formation approach with a virtual phased array transducer probe. A domain model is built from input MR images. Multiple virtual acoustic rays are emerged from each element of the linear transducer array...
May 4, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29728742/in-vivo-three-dimensional-mr-imaging-of-the-intact-anterior-cruciate-ligament-shows-a-variable-insertion-pattern-of-the-femoral-and-tibial-footprints
#12
S U Scheffler, K Maschewski, R Becker, P Asbach
PURPOSE: Failure to reconstruct the natural footprints of the ruptured anterior cruciate ligament (ACL) may lead to premature graft-failure. Therefore, precise analyses of insertion site anatomy and inter-individual variations of the morphology of the ACL are highly important to facilitate optimal individualized graft placement. Therefore, the purpose of this study was to analyze the inter-individual variation of the morphology of the femoral and tibial ACL footprints. METHODS: Thirty subjects with an intact ACL were included in this study for MR imaging of their knee joint...
May 4, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29725833/oesophageal-squamous-cell-carcinoma-histogram-derived-adc-parameters-are-not-predictive-of-tumour-response-to-chemoradiotherapy
#13
Maiko Kozumi, Hideki Ota, Takaya Yamamoto, Rei Umezawa, Haruo Matsushita, Yojiro Ishikawa, Noriyoshi Takahashi, Tomonori Matsuura, Kei Takase, Keiichi Jingu
OBJECTIVES: To evaluate correlations between tumour response to definitive chemoradiotherapy (CRT) in oesophageal squamous cell carcinoma (SCC) and histogram-derived apparent diffusion coefficient (ADC) parameters on diffusion-weighted MR images. METHODS: Forty patients with clinical T3-4 oesophageal SCC underwent concurrent CRT. MR examination at 3 T was performed 1-3 days prior to CRT. Readout-segmented echo-planar diffusion imaging was used to acquire ADC maps...
May 3, 2018: European Radiology
https://www.readbyqxmd.com/read/29724768/identification-of-chronic-active-multiple-sclerosis-lesions-on-3t-mri
#14
M Absinta, P Sati, A Fechner, M K Schindler, G Nair, D S Reich
BACKGROUND AND PURPOSE: MR imaging-pathologic studies have reported that paramagnetic rims on 7T susceptibility-based MR imaging identify, in vivo, the subset of MS lesions with compartmentalized inflammation at the lesion edge and associated remyelination failure. Here, we assessed the reliability of detecting these rims on high-resolution 3T phase images. MATERIALS AND METHODS: High-resolution T2* and phase MR imaging was collected in 20 patients with MS at 3T (3D segmented EPI, 0...
May 3, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29722063/a-discrete-polar-stockwell-transform-for-enhanced-characterization-of-tissue-structure-using-mri
#15
Glen Pridham, Martijn D Steenwijk, Jeroen J G Geurts, Yunyan Zhang
PURPOSE: The purpose of this study was to present an effective algorithm for computing the discrete polar Stockwell transform (PST), investigate its unique multiscale and multi-orientation features, and explore potentially new applications including denoising and tissue segmentation. THEORY AND METHODS: We investigated PST responses using both synthetic and MR images. Moreover, we compared the features of PST with both Gabor and Morlet wavelet transforms, and compared the PST with two wavelet approaches for denoising using MRI...
May 2, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29714673/measurement-of-whole-brain-and-gray-matter-atrophy-in-multiple-sclerosis-assessment-with-mr-imaging
#16
Loredana Storelli, Maria A Rocca, Elisabetta Pagani, Wim Van Hecke, Mark A Horsfield, Nicola De Stefano, Alex Rovira, Jaume Sastre-Garriga, Jacqueline Palace, Diana Sima, Dirk Smeets, Massimo Filippi
Purpose To compare available methods for whole-brain and gray matter (GM) atrophy estimation in multiple sclerosis (MS) in terms of repeatability (same magnetic resonance [MR] imaging unit) and reproducibility (different system/field strength) for their potential clinical applications. Materials and Methods The softwares ANTs-v1.9, CIVET-v2.1, FSL-SIENAX/SIENA-5.0.1, Icometrix-MSmetrix-1.7, and SPM-v12 were compared. This retrospective study, performed between March 2015 and March 2017, collected data from (a) eight simulated MR images and longitudinal data (2 weeks) from 10 healthy control subjects to assess the cross-sectional and longitudinal accuracy of atrophy measures, (b) test-retest MR images in 29 patients with MS acquired within the same day at different imaging unit field strengths/manufacturers to evaluate precision, and (c) longitudinal data (1 year) in 24 patients with MS for the agreement between methods...
May 27, 2018: Radiology
https://www.readbyqxmd.com/read/29713417/clinical-relationship-of-degenerative-changes-between-the-cervical-and-lumbar-spine
#17
Yuichiro Morishita, Zorica Buser, Anthony D'Oro, Keiichiro Shiba, Jeffrey C Wang
Study Design: Retrospective, observational, case series. Purpose: To elucidate the prevalence of degenerative changes in the cervical and lumbar spine and estimate the degenerative changes in the cervical spine based on the degeneration of lumbar disc through a retrospective review of magnetic resonance (MR) images. Overview of Literature: Over 50% of middle-aged adults show evidence of spinal degeneration. However, the relationship between degenerative changes in the cervical and lumbar spine has yet to be elucidated...
April 2018: Asian Spine Journal
https://www.readbyqxmd.com/read/29705172/the-effect-of-arch-drop-on-tibial-rotation-and-tibiofemoral-contact-stress-in-postpartum-women
#18
Kaitlin Rabe, Neil A Segal, Saphia Waheed, Donald D Anderson
BACKGROUND: Women are at higher risk for knee osteoarthritis and numerous other lower limb musculoskeletal disorders. Arch drop during pregnancy and the resultant excessive pronation of the feet may alter loading patterns and contribute to the higher prevalence of knee osteoarthritis in women. OBJECTIVE: To determine the effect of arch drop on tibial rotation and tibiofemoral contact stress. DESIGN: Interventional study with internal control SETTING: Biomechanics laboratory PARTICIPANTS: Eleven postpartum women (age 33...
April 26, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29704080/mr-spectroscopic-imaging-of-glial-tumors-in-the-spotlight-of-the-2016-who-classification
#19
Elie Diamandis, Carl Phillip Simon Gabriel, Urs Würtemberger, Konstanze Guggenberger, Horst Urbach, Ori Staszewski, Silke Lassmann, Oliver Schnell, Jürgen Grauvogel, Irina Mader, Dieter Henrik Heiland
BACKGROUND: The purpose of this study is to map spatial metabolite differences across three molecular subgroups of glial tumors, defined by the IDH1/2 mutation and 1p19q-co-deletion, using magnetic resonance spectroscopy. This work reports a new MR spectroscopy based classification algorithm by applying a radiomics analytics pipeline. MATERIALS: 65 patients received anatomical and chemical shift imaging (5 × 5 × 20 mm voxel size). Tumor regions were segmented and registered to corresponding spectroscopic voxels...
April 27, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29700048/segmentation-of-the-globus-pallidus-internus-using-probabilistic-diffusion-tractography-for-deep-brain-stimulation-targeting-in-parkinson-disease
#20
E H Middlebrooks, I S Tuna, S S Grewal, L Almeida, M G Heckman, E R Lesser, K D Foote, M S Okun, V M Holanda
BACKGROUND AND PURPOSE: Although globus pallidus internus deep brain stimulation is a widely accepted treatment for Parkinson disease, there is persistent variability in outcomes that is not yet fully understood. In this pilot study, we aimed to investigate the potential role of globus pallidus internus segmentation using probabilistic tractography as a supplement to traditional targeting methods. MATERIALS AND METHODS: Eleven patients undergoing globus pallidus internus deep brain stimulation were included in this retrospective analysis...
April 26, 2018: AJNR. American Journal of Neuroradiology
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