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Texture mri

Dennis Chan, Laura Marie Gallaher, Kuven Moodley, Ludovico Minati, Neil Burgess, Tom Hartley
This protocol describes the administration of the 4 Mountains Test (4MT), a short test of spatial memory, in which memory for the topographical layout of four mountains within a computer-generated landscape is tested using a delayed match-to-sample paradigm. Allocentric spatial memory is assessed by altering the viewpoint, colors and textures between the initially presented and target images. Allocentric spatial memory is a key function of the hippocampus, one of the earliest brain regions to be affected in Alzheimer's disease (AD) and impairment of hippocampal function predates the onset of dementia...
October 13, 2016: Journal of Visualized Experiments: JoVE
Tina Gupta, Steven M Silverstein, Jessica A Bernard, Brian P Keane, Thomas V Papathomas, Andrea Pelletier-Baldelli, Derek J Dean, Raeana E Newberry, Ivanka Ristanovic, Vijay A Mittal
Patients with psychosis exhibit a reduced susceptibility to depth inversion illusions (DII) in which a physically concave surface is perceived as convex (e.g., the hollow mask illusion). Here, we examined the extent to which lessened susceptibility to DII characterized youth at ultra high risk (UHR) for psychosis. In this study, 44 UHR participants and 29 healthy controls judged the apparent convexity of face-like human masks, two of which were concave and the other convex. One of the concave masks was painted with realistic texture to enhance the illusion; the other was shown without such texture...
2016: NeuroImage: Clinical
Thomas M Link, Ursula Heilmeier
Both bone mass and quality are responsible for bone strength. Whereas bone mass is measured with bone mineral density, quantification of bone quality is more complex and involves bone architecture, texture, and mechanical parameters. Over the last decade, significant progress has been made in developing technologies to measure bone quality. These include novel low-cost modalities such as trabecular bone score measured on dual-energy X-ray absorptiometry images and quantitative ultrasound as well as more advanced imaging modalities such as multidetector computed tomography, magnetic resonance imaging, and high-resolution peripheral quantitative computed tomography...
July 2016: Seminars in Musculoskeletal Radiology
Manabu Kinoshita, Mio Sakai, Hideyuki Arita, Tomoko Shofuda, Yasuyoshi Chiba, Naoki Kagawa, Yoshiyuki Watanabe, Naoya Hashimoto, Yasunori Fujimoto, Toshiki Yoshimine, Katsuyuki Nakanishi, Yonehiro Kanemura
Reports have suggested that tumor textures presented on T2-weighted images correlate with the genetic status of glioma. Therefore, development of an image analyzing framework that is capable of objective and high throughput image texture analysis for large scale image data collection is needed. The current study aimed to address the development of such a framework by introducing two novel parameters for image textures on T2-weighted images, i.e., Shannon entropy and Prewitt filtering. Twenty-two WHO grade 2 and 28 grade 3 glioma patients were collected whose pre-surgical MRI and IDH1 mutation status were available...
2016: PloS One
F Yang, J C Ford, N Dogan
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
K Tatebe, B Vaishnav, S J Chmura, J M Collins, B Aydogan
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
E D Miller, B S Erdal, X Mo, L M Prevedello, R D White, M X Welliver
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
Z Li, W Huang, Y Mao, H Li, W Li, B Li
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
Elisa Scalco, Simona Marzi, Giuseppe Sanguineti, Antonello Vidiri, Giovanna Rizzo
PURPOSE: In the treatment of Head-and-Neck Squamous Cell Carcinoma (HNSCC), the early prediction of residual malignant lymph nodes (LNs) is currently required. Here, we investigated the potential of a multi-modal characterization (combination of CT, T2w-MRI and DW-MRI) at baseline and at mid-treatment, based on texture analysis (TA), for the early prediction of LNs response to chemo-radiotherapy (CRT). METHODS: 30 patients with pathologically confirmed HNSCC treated with CRT were considered...
September 14, 2016: Physica Medica: PM
P Tiwari, P Prasanna, L Wolansky, M Pinho, M Cohen, A P Nayate, A Gupta, G Singh, K Hattanpaa, A Sloan, L Rogers, A Madabhushi
BACKGROUND AND PURPOSE: Despite availability of advanced imaging, distinguishing radiation necrosis from recurrent brain tumors noninvasively is a big challenge in neuro-oncology. Our aim was to determine the feasibility of radiomic (computer-extracted texture) features in differentiating radiation necrosis from recurrent brain tumors on routine MR imaging (gadolinium T1WI, T2WI, FLAIR). MATERIALS AND METHODS: A retrospective study of brain tumor MR imaging performed 9 months (or later) post-radiochemotherapy was performed from 2 institutions...
September 15, 2016: AJNR. American Journal of Neuroradiology
An Tassenoy, Dorien De Strijcker, Nele Adriaenssens, Pierre Lievens
Too often, in clinical settings, the diagnosis and evolution of lymphedema is determined by limb circumference measurements and/or volume calculations. Besides the unrecognition of small lymphedemas, these techniques provide little to no information concerning the stage of the lymphedema. This latter is important in choosing appropriate treatment modalities and making an accurate prognosis. Different imaging techniques are described in literature giving insights in tissue changes due to lymphedema. The aim of this article is giving an overview of possible texture changes linked to the different edema stages, visualized with noninvasive imaging procedures like ultrasonography, computed tomography, dual-energy x-ray absorptiometry, or magnetic resonance imaging...
September 2016: Lymphatic Research and Biology
Wu Zhou, Lijuan Zhang, Kaixin Wang, Shuting Chen, Guangyi Wang, Zaiyi Liu, Changhong Liang
PURPOSE: To investigate the performance of texture analysis in characterizing malignancy of hepatocellular carcinomas (HCCs) based on contrast-enhanced magnetic resonance imaging (MRI). MATERIALS AND METHODS: Gd-DTPA contrast-enhanced MRI data of 46 consecutive subjects with resected HCC were retrieved. The mean intensity and gray-level run-length nonuniformity (GLN) were quantified as the discriminative features based on the arterial phase images and compared between groups with different histological grading using independent Student's t-test or Welch-Satterthwaite approximate t-test for data following a normal distribution and Mann-Whitney U-test for data violating the normal distribution...
September 14, 2016: Journal of Magnetic Resonance Imaging: JMRI
Harbir S Sidhu, Salvatore Benigno, Balaji Ganeshan, Nikos Dikaios, Edward W Johnston, Clare Allen, Alex Kirkham, Ashley M Groves, Hashim U Ahmed, Mark Emberton, Stuart A Taylor, Steve Halligan, Shonit Punwani
OBJECTIVES: To evaluate multiparametric-MRI (mpMRI) derived histogram textural-analysis parameters for detection of transition zone (TZ) prostatic tumour. METHODS: Sixty-seven consecutive men with suspected prostate cancer underwent 1.5T mpMRI prior to template-mapping-biopsy (TPM). Twenty-six men had 'significant' TZ tumour. Two radiologists in consensus matched TPM to the single axial slice best depicting tumour, or largest TZ diameter for those with benign histology, to define single-slice whole TZ-regions-of-interest (ROIs)...
September 12, 2016: European Radiology
Xiaoyao Fan, David W Roberts, Timothy J Schaewe, Songbai Ji, Leslie H Holton, David A Simon, Keith D Paulsen
OBJECTIVE Preoperative magnetic resonance images (pMR) are typically coregistered to provide intraoperative navigation, the accuracy of which can be significantly compromised by brain deformation. In this study, the authors generated updated MR images (uMR) in the operating room (OR) to compensate for brain shift due to dural opening, and evaluated the accuracy and computational efficiency of the process. METHODS In 20 open cranial neurosurgical cases, a pair of intraoperative stereovision (iSV) images was acquired after dural opening to reconstruct a 3D profile of the exposed cortical surface...
September 9, 2016: Journal of Neurosurgery
Meriem El Azami, Alexander Hammers, Julien Jung, Nicolas Costes, Romain Bouet, Carole Lartizien
Pattern recognition methods, such as computer aided diagnosis (CAD) systems, can help clinicians in their diagnosis by marking abnormal regions in an image. We propose a machine learning system based on a one-class support vector machine (OC-SVM) classifier for the detection of abnormalities in magnetic resonance images (MRI) applied to patients with intractable epilepsy. The system learns the features associated with healthy control subjects, allowing a voxelwise assessment of the deviation of a test subject pattern from the learned patterns...
2016: PloS One
Spiros A Kostopoulos, Katerina G Vassiou, Eleftherios N Lavdas, Dionisis A Cavouras, Ioannis K Kalatzis, Pantelis A Asvestas, Dimitrios L Arvanitis, Ioannis V Fezoulidis, Dimitris T Glotsos
Dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) with gadolinium constitutes one of the most promising protocols for boosting up the sensitivity in breast cancer detection. The aim of this study was twofold: first to design an image processing methodology to estimate the vascularity of the breast region in DCE-MRI images and second to investigate whether the differences in the composition/texture and vascularity of normal, benign and malignant breasts may serve as potential indicators regarding the presence of the disease...
August 26, 2016: Magnetic Resonance Imaging
J David Spence
In recent years, there have been a number of advances in the pathogenesis and treatment of atherosclerosis and in assessing prognosis in carotid atherosclerosis. Risk stratification to improve vascular prevention by identifying patients most likely to benefit from intensive therapy is much improved by measuring carotid plaque burden. In patients with asymptomatic carotid stenosis, a number of modalities can be used to identify the 10-15% who could benefit from endarterectomy or stenting. Transcranial Doppler embolus detection, echolucency and ulceration on 3D ultrasound, intraplaque hemorrhage on magnetic resonance imaging (MRI), and reduced cerebrovascular reserve are useful already; new approaches including plaque texture on ultrasound and imaging of plaque inflammation and early calcification on positron emission tomography/computed tomography (PET/CT) are in development...
2016: F1000Research
Omer Jalil, Asim Afaq, Balaji Ganeshan, Uday B Patel, Darren Boone, Raymond Endozo, Ashley Groves, Bruce Sizer, Tan Arulampalam
AIM: The study aimed to investigate whether textural features of rectal cancer on magnetic resonance imaging (MRI) can predict long term survival in patients treated with long-course chemoradiotherapy. METHOD: Textural analysis (TA) using a filtration-histogram technique of T2-weighted pre- and six-week post chemoradiotherapy MRI was undertaken using TexRAD, a proprietary software algorithm. Regions of interest enclosing the largest cross-sectional area of the tumour were manually delineated on the axial images and filtration-step extracted features at different anatomical scales (fine, medium, and coarse) followed by quantification of statistical features (mean intensity, standard-deviation, entropy, skewness, kurtosis and mean of positive pixels [MPP]) using histogram analysis...
August 18, 2016: Colorectal Disease: the Official Journal of the Association of Coloproctology of Great Britain and Ireland
Leland S Hu, Shuluo Ning, Jennifer M Eschbacher, Leslie C Baxter, Nathan Gaw, Sara Ranjbar, Jonathan Plasencia, Amylou C Dueck, Sen Peng, Kris A Smith, Peter Nakaji, John P Karis, C Chad Quarles, Teresa Wu, Joseph C Loftus, Robert B Jenkins, Hugues Sicotte, Thomas M Kollmeyer, Brian P O'Neill, William Elmquist, Joseph M Hoxworth, David Frakes, Jann Sarkaria, Kristin R Swanson, Nhan L Tran, Jing Li, J Ross Mitchell
BACKGROUND: Glioblastoma (GBM) exhibits profound intratumoral genetic heterogeneity. Each tumor comprises multiple genetically distinct clonal populations with different therapeutic sensitivities. This has implications for targeted therapy and genetically informed paradigms. Contrast-enhanced (CE)-MRI and conventional sampling techniques have failed to resolve this heterogeneity, particularly for nonenhancing tumor populations. This study explores the feasibility of using multiparametric MRI and texture analysis to characterize regional genetic heterogeneity throughout MRI-enhancing and nonenhancing tumor segments...
August 8, 2016: Neuro-oncology
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