نتایج جستجو برای: tumor variability

تعداد نتایج: 597804  

2002
Sean Ho Elizabeth Bullitt Guido Gerig

This paper discusses the development of a new method for the automatic segmentation of anatomical structures from volumetric medical images. Driving application is the segmentation of 3-D tumor structures from magnetic resonance images (MRI), which is known to be a very challenging segmentation problem due to the variability of tumor geometry and intensity patterns. Level set evolution combinin...

Journal: :Clinical cancer research : an official journal of the American Association for Cancer Research 2007
Rebecca E Sadun Suzanne M Sachsman Xiaoying Chen Kamilee W Christenson William Z Morris Peisheng Hu Alan L Epstein

PURPOSE Despite lymphocyte infiltration of tumors and the activation of tumor-draining lymph nodes, malignant tumors are able to "escape" from both innate and adaptive immune responses. For immunotherapy to be successful, it must reverse these escape mechanisms, which necessitates explicit and tumor-specific elucidation of tumor escape strategies. RESEARCH DESIGN To identify relevant escape m...

Journal: :Journal of magnetic resonance imaging : JMRI 2012
Benjamin M Ellingson Taryar Zaw Timothy F Cloughesy Kourosh M Naeini Shadi Lalezari Sandy Mong Albert Lai Phioanh L Nghiemphu Whitney B Pope

PURPOSE To compare "standardization," "Gaussian normalization," and "Z-score normalization" intensity transformation techniques in dynamic susceptibility contrast magnetic resonance imaging (DSC-MRI) estimates of cerebral blood volume (CBV) in human gliomas. DSC-MRI is a well-established biomarker for CBV in brain tumors; however, DSC-MRI estimates of CBV are semiquantitative. The use of image ...

Journal: :Current Directions in Biomedical Engineering 2021

Abstract Medulloblastoma (MB) is a primary central nervous system tumor and the most common malignant brain cancer among children. Neuropathologists perform microscopic inspection of histopathological tissue slides under microscope to assess severity tumor. This timeconsuming task often infused with observer variability. Recently, pre-trained convolutional neural networks (CNN) have shown promi...

Journal: :Scientific reports 2016
Michele Zanoni Filippo Piccinini Chiara Arienti Alice Zamagni Spartaco Santi Rolando Polico Alessandro Bevilacqua Anna Tesei

The potential of a spheroid tumor model composed of cells in different proliferative and metabolic states for the development of new anticancer strategies has been amply demonstrated. However, there is little or no information in the literature on the problems of reproducibility of data originating from experiments using 3D models. Our analyses, carried out using a novel open source software ca...

Journal: :Circulation 2002
Arthur A J Smit Henri J L M Timmers Wouter Wieling Mariette Wagenaar Henri A M Marres Jacques W M Lenders Gert A van Montfrans John M Karemaker

BACKGROUND After experimental carotid sinus denervation in animals, blood pressure (BP) level and variability increase markedly but normalize to preoperative levels within 10 to 14 days. We investigated the course of arterial BP level and variability after bilateral denervation of the carotid sinus baroreceptors in humans. METHODS AND RESULTS We studied 4 women (age 41 to 63 years) who were r...

Journal: :Journal of the National Cancer Institute 2014
Tiffany Shao Lisa Wang Arnoud J Templeton Raymond Jang Francisco W Vera-Badillo Mairead G McNamara Myles Margolis Tae Kyoung Kim Mehrdad Sinaei Hassan Shoushtari Ian F Tannock

BACKGROUND "Waterfall plots" are used to describe changes in tumor size observed in clinical studies. Here we assess criteria for generation of waterfall plots and the impact of measurement error in generating them. METHODS We reviewed published waterfall plots to investigate variability in criteria used to define them. We then compared waterfall plots generated by different observers for 24 ...

آقائی, علیرضا, سبزی‌سروستانی, منصوره,

 Nearly simultaneous multiband monitoring of blazars is very limited and most studies reported in literature are conflicting, too. Although optical variability on intra-night timescales is now a well established phenomenon for blazars, its relationship to long-term variability remains unclear. Possible clues could come from monitoring the optical spectrum for correlation with brightness. The pr...

Journal: :گوارش 0
homaun vahedi masoud sotoudeh golrokh olfati

endocrine tumors of the pancreas (islet-cell tumors) are rare with neuroendocrine origin. the patient was a 41- year- old man, admitted with chief complains of epigastric mass feeling, dull abdominal pain, lack of appetite and weight loss up to 2-3 kg since 6 months ago. in physical examination, a mass was detected in epigaster and left upper quadrant (luq). in abdominal x-ray, a calcified mass...

Journal: :iranian journal of pathology 0
bita geramizadeh dept. of pathology, transplant research center, shiraz university of medical sciences, shiraz, iran mahsa marzban university of british columbia, vancouver, bc, canada andrew churg dept. of pathology, vancouver general hospital and university of british columbia, vancouver , bc, canada

background: solitary fibrous tumor (sft) is a mesenchymal tumor which is most commonly seen in the pleura; however it can be seen in other organs such as the meninge, gastrointestinal tract, soft tissue, bone, and skin. sft should be differentiated from other mesenchymal tumors in these organs. immunohistochemistry plays a pivotal role for the histopathologic diagnosis of this tumor. currently,...

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