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Texture mri

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https://www.readbyqxmd.com/read/29915951/prediction-of-survival-with-multi-scale-radiomic-analysis-in-glioblastoma-patients
#1
Ahmad Chaddad, Siham Sabri, Tamim Niazi, Bassam Abdulkarim
We propose a multiscale texture features based on Laplacian-of Gaussian (LoG) filter to predict progression free (PFS) and overall survival (OS) in patients newly diagnosed with glioblastoma (GBM). Experiments use the extracted features derived from 40 patients of GBM with T1-weighted imaging (T1-WI) and Fluid-attenuated inversion recovery (FLAIR) images that were segmented manually into areas of active tumor, necrosis, and edema. Multiscale texture features were extracted locally from each of these areas of interest using a LoG filter and the relation between features to OS and PFS was investigated using univariate (i...
June 19, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29914313/multi-objective-genetic-algorithms-to-find-most-relevant-volumes-of-the-brain-related-to-alzheimer-s-disease-and-mild-cognitive-impairment
#2
Olga Valenzuela, Xiaoyi Jiang, Antonio Carrillo, Ignacio Rojas
Computer-Aided Diagnosis (CAD) represents a relevant instrument to automatically classify between patients with and without Alzheimer's Disease (AD) using several actual imaging techniques. This study analyzes the optimization of volumes of interest (VOIs) to extract three-dimensional (3D) textures from Magnetic Resonance Image (MRI) in order to diagnose AD, Mild Cognitive Impairment converter (MCIc), Mild Cognitive Impairment nonconverter (MCInc) and Normal subjects. A relevant feature of the proposed approach is the use of 3D features instead of traditional two-dimensional (2D) features, by using 3D discrete wavelet transform (3D-DWT) approach for performing feature extraction from T-1 weighted MRI...
May 7, 2018: International Journal of Neural Systems
https://www.readbyqxmd.com/read/29891091/evaluation-of-radiomic-texture-feature-error-due-to-mri-acquisition-and-reconstruction-a-simulation-study-utilizing-ground-truth
#3
Fei Yang, Nesrin Dogan, Radka Stoyanova, John Chetley Ford
The purpose of this study was to examine the dependence of image texture features on MR acquisition parameters and reconstruction using a digital MR imaging phantom. MR signal was simulated in a parallel imaging radiofrequency coil setting as well as a single element volume coil setting, with varying levels of acquisition noise, three acceleration factors, and four image reconstruction algorithms. Twenty-six texture features were measured on the simulated images, ground truth images, and clinical brain images...
June 2018: Physica Medica: PM
https://www.readbyqxmd.com/read/29883682/regional-brain-tissue-integrity-in-pediatric-obstructive-sleep-apnea
#4
Leila Kheirandish-Gozal, Ashish K Sahib, Paul M Macey, Mona F Philby, David Gozal, Rajesh Kumar
Children with long-standing obstructive sleep apnea (OSA) show evidence of neural injury and functional deficits in behavioral and cognitive regulatory brain regions that are reflected in symptoms of altered cognitive performance and behaviors. While we earlier showed reduced gray matter volume and increased and reduced regional cortical thicknesses, such structural changes give little indication of the underlying pathology. Brain tissue integrity in pediatric OSA subjects can reflect the nature and extent of injury or structural adaptation, and can be assessed by entropy tissue texture, a measure of local changes in signal intensity patterns from high-resolution magnetic resonance images...
June 5, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29882527/radiomics-of-liver-mri-predict-metastases-in-mice
#5
Anton S Becker, Marcel A Schneider, Moritz C Wurnig, Matthias Wagner, Pierre A Clavien, Andreas Boss
Background: The purpose of this study was to investigate whether any texture features show a correlation with intrahepatic tumor growth before the metastasis is visible to the human eye. Methods: Eight male C57BL6 mice (age 8-10 weeks) were injected intraportally with syngeneic MC-38 colon cancer cells and two mice were injected with phosphate-buffered saline (sham controls). Small animal magnetic resonance imaging (MRI) at 4.7 T was performed at baseline and days 4, 8, 12, 16, and 20 after injection applying a T2-weighted spin-echo sequence...
2018: European radiology experimental
https://www.readbyqxmd.com/read/29881933/assessment-of-therapy-response-to-transarterial-radioembolization-for-liver-metastases-by-means-of-post-treatment-mri-based-texture-analysis
#6
Robert P Reimer, Peter Reimer, Andreas H Mahnken
INTRODUCTION: To determine whether post-treatment magnetic resonance imaging (MRI)-based texture analysis of liver metastases (LM) may be suited predicting therapy response to transarterial radioembolization (TARE) during follow-up. MATERIALS AND METHODS: Thirty-seven patients with LM treated by TARE (mean age 63.4 years) between January 2006 and December 2014 were identified in this retrospective feasibility study. They underwent dynamic contrast-enhanced and hepatocellular phase MRI after TARE (mean 2...
June 7, 2018: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/29870361/dagan-deep-de-aliasing-generative-adversarial-networks-for-fast-compressed-sensing-mri-reconstruction
#7
Guang Yang, Simiao Yu, Hao Dong, Greg Slabaugh, Pier Luigi Dragotti, Xujiong Ye, Fangde Liu, Simon Arridge, Jennifer Keegan, Yike Guo, David Firmin
Compressed sensing magnetic resonance imaging (CS-MRI) enables fast acquisition, which is highly desirable for numerous clinical applications. This can not only reduce the scanning cost and ease patient burden, but also potentially reduce motion artefacts and the effect of contrast washout, thus yielding better image quality. Different from parallel imaging-based fast MRI, which utilizes multiple coils to simultaneously receive MR signals, CS-MRI breaks the Nyquist-Shannon sampling barrier to reconstruct MRI images with much less required raw data...
June 2018: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/29868465/exploring-applications-of-radiomics-in-magnetic-resonance-imaging-of-head-and-neck-cancer-a-systematic-review
#8
Amit Jethanandani, Timothy A Lin, Stefania Volpe, Hesham Elhalawani, Abdallah S R Mohamed, Pei Yang, Clifton D Fuller
Background: Radiomics has been widely investigated for non-invasive acquisition of quantitative textural information from anatomic structures. While the vast majority of radiomic analysis is performed on images obtained from computed tomography, magnetic resonance imaging (MRI)-based radiomics has generated increased attention. In head and neck cancer (HNC), however, attempts to perform consistent investigations are sparse, and it is unclear whether the resulting textural features can be reproduced...
2018: Frontiers in Oncology
https://www.readbyqxmd.com/read/29866751/texture-analysis-of-t1-weighted-and-fluid-attenuated-inversion-recovery-images-detects-abnormalities-that-correlate-with-cognitive-decline-in-small-vessel-disease
#9
Daniel J Tozer, Eva Zeestraten, Andrew J Lawrence, Thomas R Barrick, Hugh S Markus
BACKGROUND AND PURPOSE: Magnetic resonance imaging may be useful to assess disease severity in cerebral small vessel disease (SVD), identify those individuals who are most likely to progress to dementia, monitor disease progression, and act as surrogate markers to test new therapies. Texture analysis extracts information on the relationship between signal intensities of neighboring voxels. A potential advantage over techniques, such as diffusion tensor imaging, is that it can be used on clinically obtained magnetic resonance sequences...
June 4, 2018: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29864362/chiral-domain-structure-in-superfluid-3-he-a-studied-by-magnetic-resonance-imaging
#10
J Kasai, Y Okamoto, K Nishioka, T Takagi, Y Sasaki
The existence of a spatially varying texture in superfluid ^{3}He is a direct manifestation of the complex macroscopic wave function. The real space shape of the texture, namely, a macroscopic wave function, has been studied extensively with the help of theoretical modeling but has never been directly observed experimentally with spatial resolution. We have succeeded in visualizing the texture by a specialized magnetic resonance imaging. With this new technology, we have discovered that the macroscopic chiral domains, of which sizes are as large as 1 mm, and corresponding chiral domain walls exist rather stably in ^{3}He-A film at temperatures far below the transition temperature...
May 18, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29863601/magnetic-resonance-imaging-based-grading-of-cartilaginous-bone-tumors-added-value-of-quantitative-texture-analysis
#11
Benjamin Fritz, Daniel A Müller, Reto Sutter, Moritz C Wurnig, Matthias W Wagner, Christian W A Pfirrmann, Michael A Fischer
OBJECTIVES: The aim of this study was to assess the interreader agreement and diagnostic accuracy of morphologic magnetic resonance imaging (MRI) analysis and quantitative MRI-based texture analysis (TA) for grading of cartilaginous bone tumors. MATERIALS AND METHODS: This retrospective study was approved by our local ethics committee. Magnetic resonance imaging scans of 116 cartilaginous bone neoplasms were included (53 chondromas, 26 low-grade chondrosarcomas, 37 high-grade chondrosarcomas)...
May 31, 2018: Investigative Radiology
https://www.readbyqxmd.com/read/29860889/texture-analysis-on-diffusion-tensor-imaging-discriminating-glioblastoma-from-single-brain-metastasis
#12
Karoline Skogen, Anselm Schulz, Eirik Helseth, Balaji Ganeshan, Johann Baptist Dormagen, Andrès Server
Background Texture analysis has been done on several radiological modalities to stage, differentiate, and predict prognosis in many oncologic tumors. Purpose To determine the diagnostic accuracy of discriminating glioblastoma (GBM) from single brain metastasis (MET) by assessing the heterogeneity of both the solid tumor and the peritumoral edema with magnetic resonance imaging (MRI) texture analysis (MRTA). Material and Methods Preoperative MRI examinations done on a 3-T scanner of 43 patients were included: 22 GBM and 21 MET...
January 1, 2018: Acta Radiologica
https://www.readbyqxmd.com/read/29804627/value-of-texture-analysis-based-on-enhanced-mri-for-predicting-an-early-therapeutic-response-to-transcatheter-arterial-chemoembolisation-combined-with-high-intensity-focused-ultrasound-treatment-in-hepatocellular-carcinoma
#13
J Y Yu, H P Zhang, Z Y Tang, J Zhou, X J He, Y Y Liu, X J Liu, D J Guo
AIM: To evaluate the potential value of texture analysis (TA) based on contrast-enhanced magnetic resonance imaging (MRI) for predicting an early response of patients with hepatocellular carcinoma (HCC) who were treated with transcatheter arterial chemoembolisation (TACE) combined with high-intensity focused ultrasound (HIFU). MATERIALS AND METHODS: Patients with HCC (n=89) who underwent contrast-enhanced MRI at 1.5 T 1 week before and 1 week, 1 month, and 3 months after TACE/HIFU were included in this retrospective study...
May 24, 2018: Clinical Radiology
https://www.readbyqxmd.com/read/29804410/-primary-renal-lymphoma-a-clinical-analysis-of-5-cases
#14
L Lu, H Z Shi, Z J Xiao, D Wang, C L Li
Objective: To improve the clinical diagnosis and treatment of primary renal lymphoma. Methods: Clinical data of 5 cases ( 2 male cases and 3 female cases) with primary renal lymphoma was reviewed. The age of patients was 55 to 70 years old, with a mean age of 62 years. No history of glomerulonephritis or nephropathy was recorded. All the cases were unilateral, including 3 cases in the left side and 2 cases in right. The major clinical manifestations were as follows: 2 cases of left lumbar pain, 1 case of gross hematuria, 1 case of hematuria under microscope, and 1 case receiving adjuvant chemotherapy after 12 years...
May 15, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29803493/effect-of-multiple-freeze-thaw-cycles-on-the-quality-of-instant-sea-cucumber-emphatically-on-water-status-of-by-lf-nmr-and-mri
#15
Mingqian Tan, Zhuyi Lin, Yinxue Zu, Beiwei Zhu, Shasha Cheng
Instant sea cucumber has become one popular product due to its convenience to eat, favourable taste and minimal loss of nutrients and bioactive components. However, there was rare information about the water dynamic of instant sea cucumber subjected to multiple freeze-thaw cycles. In this study, low-field nuclear magnetic resonance (LF-NMR) and magnetic resonance image (MRI) were employed to investigate the effect of freeze-thaw cycles on water status of instant sea cucumber. Four water populations corresponding to strongly bound water, weakly bound water, immobile water and free water were observed in instant sea cucumber...
July 2018: Food Research International
https://www.readbyqxmd.com/read/29801863/high-humidity-hot-air-impingement-blanching-alters-texture-cell-wall-polysaccharides-water-status-and-distribution-of-seedless-grape
#16
Jun Wang, Arun S Mujumdar, Li-Zhen Deng, Zhen-Jiang Gao, Hong-Wei Xiao, G S V Raghavan
Blanching pretreatment plays an essential role in fruits and vegetables processing to obtain excellent final products. The purpose of current work was to characterise the texture, cell-wall polysaccharides and water distribution of grapes pre- and post- high-humidity hot air impingement blanching (HHAIB). The cell-wall pectins nanostructure, water status and distribution of samples were determined by atomic force microscopy (AFM), low field nuclear magnetic resonance (LF-NMR) and magnetic resonance image (MRI), respectively...
August 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29777107/differentiation-of-periapical-granulomas-and-cysts-by-using-dental-mri-a-pilot-study
#17
Alexander Juerchott, Thorsten Pfefferle, Christa Flechtenmacher, Johannes Mente, Martin Bendszus, Sabine Heiland, Tim Hilgenfeld
The purpose of this pilot study was to evaluate whether periapical granulomas can be differentiated from periapical cysts in vivo by using dental magnetic resonance imaging (MRI). Prior to apicoectomy, 11 patients with radiographically confirmed periapical lesions underwent dental MRI, including fat-saturated T2-weighted (T2wFS) images, non-contrast-enhanced T1-weighted images with and without fat saturation (T1w/T1wFS), and contrast-enhanced fat-saturated T1-weighted (T1wFS+C) images. Two independent observers performed structured image analysis of MRI datasets twice...
May 17, 2018: International Journal of Oral Science
https://www.readbyqxmd.com/read/29769456/machine-learning-based-texture-analysis-of-contrast-enhanced-mr-imaging-to-differentiate-between-glioblastoma-and-primary-central-nervous-system-lymphoma
#18
Akira Kunimatsu, Natsuko Kunimatsu, Koichiro Yasaka, Hiroyuki Akai, Kouhei Kamiya, Takeyuki Watadani, Harushi Mori, Osamu Abe
PURPOSE: Although advanced MRI techniques are increasingly available, imaging differentiation between glioblastoma and primary central nervous system lymphoma (PCNSL) is sometimes confusing. We aimed to evaluate the performance of image classification by support vector machine, a method of traditional machine learning, using texture features computed from contrast-enhanced T1 -weighted images. METHODS: This retrospective study on preoperative brain tumor MRI included 76 consecutives, initially treated patients with glioblastoma (n = 55) or PCNSL (n = 21) from one institution, consisting of independent training group (n = 60: 44 glioblastomas and 16 PCNSLs) and test group (n = 16: 11 glioblastomas and 5 PCNSLs) sequentially separated by time periods...
May 16, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29769042/mpcad-a-multi-scale-radiomics-driven-framework-for-automated-prostate-cancer-localization-and-detection
#19
Farzad Khalvati, Junjie Zhang, Audrey G Chung, Mohammad Javad Shafiee, Alexander Wong, Masoom A Haider
BACKGROUND: Quantitative radiomic features provide a plethora of minable data extracted from multi-parametric magnetic resonance imaging (MP-MRI) which can be used for accurate detection and localization of prostate cancer. While most cancer detection algorithms utilize either voxel-based or region-based feature models, the complexity of prostate tumour phenotype in MP-MRI requires a more sophisticated framework to better leverage available data and exploit a priori knowledge in the field...
May 16, 2018: BMC Medical Imaging
https://www.readbyqxmd.com/read/29763764/machine-learning-based-brain-tumour-segmentation-on-limited-data-using-local-texture-and-abnormality
#20
Stijn Bonte, Ingeborg Goethals, Roel Van Holen
Brain tumour segmentation in medical images is a very challenging task due to the large variety in tumour shape, position, appearance, scanning modalities and scanning parameters. Most existing segmentation algorithms use information from four different MRI-sequences, but since this is often not available, there is need for a method able to delineate the different tumour tissues based on a minimal amount of data. We present a novel approach using a Random Forests model combining voxelwise texture and abnormality features on a contrast-enhanced T1 and FLAIR MRI...
May 7, 2018: Computers in Biology and Medicine
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