keyword
MENU ▼
Read by QxMD icon Read
search

kurtosis

keyword
https://www.readbyqxmd.com/read/29776385/generation-of-ventilation-perfusion-ratio-map-in-surgical-patients-by-dual-energy-ct-after-xenon-inhalation-and-intravenous-contrast-media
#1
Kohei Aoki, Yotaro Izumi, Wataru Watanabe, Yuji Shimizu, Hisato Osada, Norinari Honda, Toshihide Itoh, Mitsuo Nakayama
BACKGROUND: While many studies have evaluated the change in lung volume before and after lung resection and correlated this with pulmonary function test results, there is very little evidence on the changes in ventilation perfusion ratio (V/Q) before versus after lung resection. In the present pilot study, we evaluated if V/Q mapping can be constructed using dual energy CT images. METHODS: Thirty-one lung cancer patients planned for pulmonary resection were included in this study...
May 18, 2018: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/29776135/transition-to-collective-oscillations-in-finite-kuramoto-ensembles
#2
Franziska Peter, Arkady Pikovsky
We present an alternative approach to finite-size effects around the synchronization transition in the standard Kuramoto model. Our main focus lies on the conditions under which a collective oscillatory mode is well defined. For this purpose, the minimal value of the amplitude of the complex Kuramoto order parameter appears as a proper indicator. The dependence of this minimum on coupling strength varies due to sampling variations and correlates with the sample kurtosis of the natural frequency distribution...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29766933/corticospinal-tract-changes-in-acute-brainstem-ischemic-stroke-patients-a-diffusion-kurtosis-imaging-study
#3
Huiyou Chen, Liang Jiang, Hong Zhang, Ying-Dong Zhang, Wen Geng, Yuan Feng, Qian Chen, Yu-Chen Chen, Xindao Yin
Purpose: The present study aimed to investigate the corticospinal tract (CST) changes in patients with brainstem ischemic stroke by using the diffusion kurtosis imaging (DKI) approach.. Materials and Methods: Twenty-one patients with brainstem stroke and 21 group-matched healthy controls underwent brain DKI with 3.0 T magnetic resonance imaging (MRI). The DKI was obtained by using three b values of 0, 1,000, 2,000 s/mm2 with 15 diffusion directions. Regions of interest (ROIs) were placed at four levels: the pons, posterior limb of the internal capsule (PLIC), corona radiata, and precentral gyrus...
May 2018: Neurology India
https://www.readbyqxmd.com/read/29765520/histogram-analysis-parameters-of-dynamic-contrast-enhanced-magnetic-resonance-imaging-can-predict-histopathological-findings-including-proliferation-potential-cellularity-and-nucleic-areas-in-head-and-neck-squamous-cell-carcinoma
#4
Alexey Surov, Hans Jonas Meyer, Leonard Leifels, Anne-Kathrin Höhn, Cindy Richter, Karsten Winter
Our purpose was to analyze possible associations between histogram analysis parameters of dynamic contrast-enhanced magnetic resonance imaging DCE MRI and histopathological findings like proliferation index, cell count and nucleic areas in head and neck squamous cell carcinoma (HNSCC). 30 patients (mean age 57.0 years) with primary HNSCC were included in the study. In every case, histogram analysis parameters of Ktrans , Ve , and Kep were estimated using a mathlab based software. Tumor proliferation index, cell count, and nucleic areas were estimated on Ki 67 antigen stained specimens...
April 20, 2018: Oncotarget
https://www.readbyqxmd.com/read/29761118/susceptibility-weighted-and-diffusion-kurtosis-imaging-to-evaluate-encephalomalacia-with-epilepsy-after-traumatic-brain-injury
#5
Wenbin Li, Xuan Wang, Xiaoer Wei, Mingliang Wang
Objective: Encephalomalacia after traumatic brain injury (TBI) is one of the factors leading to epilepsy. In this study, magnetic resonance imaging (MRI) was used to explore the brain image features of epilepsy after traumatic encephalomalacia, and to provide objective evidence for predicting the possible occurrence of epilepsy after traumatic encephalomalacia. Methods: Two-hundred-fifty-two patients with traumatic encephalomalacia were prospectively enrolled in the study...
May 2018: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/29755685/selected-pet-radiomic-features-remain-the-same
#6
Tetsuya Tsujikawa, Hideaki Tsuyoshi, Masafumi Kanno, Shizuka Yamada, Masato Kobayashi, Norihiko Narita, Hirohiko Kimura, Shigeharu Fujieda, Yoshio Yoshida, Hidehiko Okazawa
Purpose: We investigated whether PET radiomic features are affected by differences in the scanner, scan protocol, and lesion location using 18 F-FDG PET/CT and PET/MR scans. Results: SUV, TMR, skewness, kurtosis, entropy, and homogeneity strongly correlated between PET/CT and PET/MR images. SUVs were significantly higher on PET/MR0-2 min and PET/MR0-10 min than on PET/CT in gynecological cancer ( p = 0.008 and 0.008, respectively), whereas no significant difference was observed between PET/CT, PET/MR0-2 min , and PET/MR0-10 min images in oral cavity/oropharyngeal cancer...
April 17, 2018: Oncotarget
https://www.readbyqxmd.com/read/29754276/-718-f-fdg-pet-ct-metabolic-tumor-parameters-and-radiomics-features-in-aggressive-non-hodgkin-s-lymphoma-as-predictors-of-treatment-outcome-and-survival
#7
Aatif Parvez, Noam Tau, Douglas Hussey, Manjula Maganti, Ur Metser
PURPOSE: To determine whether metabolic tumor parameters and radiomic features extracted from 18 F-FDG PET/CT (PET) can predict response to therapy and outcome in patients with aggressive B-cell lymphoma. METHODS: This institutional ethics board-approved retrospective study included 82 patients undergoing PET for aggressive B-cell lymphoma staging. Whole-body metabolic tumor volume (MTV) using various thresholds and tumor radiomic features were assessed on representative tumor sites...
May 12, 2018: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/29748207/use-of-diffusional-kurtosis-imaging-and-dynamic-contrast-enhanced-mr-imaging-to-predict-posttraumatic-epilepsy-in-rabbits
#8
W Li, X Wang, X Wei, M Wang
BACKGROUND AND PURPOSE: Finding a reliable biomarker to thoroughly assess the brain structure changes in posttraumatic epilepsy is of great importance. Our aim was to explore the value of diffusional kurtosis imaging combined with dynamic contrast-enhanced MR imaging in the evaluation of posttraumatic epilepsy. MATERIALS AND METHODS: A modified weight-drop device was used to induce traumatic brain injury. Rabbits were exposed to traumatic brain injury or sham injury...
May 10, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29748203/comparative-analysis-of-diffusional-kurtosis-imaging-diffusion-tensor-imaging-and-diffusion-weighted-imaging-in-grading-and-assessing-cellular-proliferation-of-meningiomas
#9
L Lin, R Bhawana, Y Xue, Q Duan, R Jiang, H Chen, X Chen, B Sun, H Lin
BACKGROUND AND PURPOSE: An accurate evaluation of the World Health Organization grade and cellular proliferation is particularly important in meningiomas. Our aim was to prospectively evaluate and compare diffusional kurtosis imaging, DTI, and DWI metrics in determining the grade and cellular proliferation of meningiomas. MATERIALS AND METHODS: Ninety-six consecutive patients with histopathologically confirmed meningiomas were included in this study. Mean kurtosis, radial kurtosis, axial kurtosis, fractional anisotropy, mean diffusivity, and ADC were semiautomatically obtained in the solid components of tumors...
May 10, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29740660/differentiation-between-malignant-and-benign-musculoskeletal-tumors-using-diffusion-kurtosis-imaging
#10
Masaki Ogawa, Hirohito Kan, Nobuyuki Arai, Taro Murai, Yoshihiko Manabe, Yusuke Sawada, Yuta Shibamoto
OBJECTIVE: The purpose of this study was to evaluate differences in parameters of diffusion kurtosis imaging (DKI) and minimum apparent diffusion coefficient (ADCmin ) between benign and malignant musculoskeletal tumors. MATERIALS AND METHODS: In this prospective study, 43 patients were scanned using a DKI protocol on a 3-T MR scanner. Eligibility criteria were: non-fatty, non-cystic soft tissue or osteolytic tumors; > 2 cm; location in the retroperitoneum, pelvis, leg, or neck; and no prior treatment...
May 9, 2018: Skeletal Radiology
https://www.readbyqxmd.com/read/29728983/study-on-feature-selection-methods-for-depression-detection-using-three-electrode-eeg-data
#11
Hanshu Cai, Yunfei Chen, Jiashuo Han, Xiangzi Zhang, Bin Hu
The early diagnosis of depression is important to the treatment of this condition, whereas a timely diagnosis can reduce the incidence of mortality caused in patients with depression. In the present study, we collected the EEG signals of Fp2, Fpz and Fp1, compared with 128 channels EEG, a simpler test (3 channels EEG) can make diagnosis more accessible and widespread, researchers can perform more tests on more patients given the same amount of time and money. The difference between the depressed and the non-depressed patients was explored by the linear and non-linear characteristics of these EEG signals...
May 4, 2018: Interdisciplinary Sciences, Computational Life Sciences
https://www.readbyqxmd.com/read/29725853/effect-of-implant-macrogeometry-on-peri-implant-healing-outcomes-a-randomized-clinical-trial
#12
Luiz Carlos do Carmo Filho, Fernanda Faot, Marina de Matos Madruga, Raissa Micaella Marcello-Machado, Dimorvan Bordin, Altair Antoninha Del Bel Cury
OBJECTIVES: This randomized split-mouth clinical trial investigated the influence of implant macrogeometry on bone properties and peri-implant health parameters during the healing process. MATERIAL AND METHODS: Ninety-nine implants were placed bilaterally in posterior mandibles of 23 patients that received at least four dental implant macrogeometries: standard geometry, Integra (IN) and three geometries inducing "healing chamber": Duo (D), Compact (C), and Infra (IF)...
May 3, 2018: Clinical Oral Investigations
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/29721752/prediction-of-survival-in-patients-affected-by-glioblastoma-histogram-analysis-of-perfusion-mri
#14
Andrea Romano, Luca Pasquini, Alberto Di Napoli, Francesca Tavanti, Alessandro Boellis, Maria Camilla Rossi Espagnet, Giuseppe Minniti, Alessandro Bozzao
PURPOSE: The identification of prognostic biomarkers plays a pivotal role in the management of glioblastoma. The aim of this study was to assess the role of magnetic resonance dynamic susceptibility contrast imaging (DSC-MRI) with histogram analysis in the prognostic evaluation of patients suffering from glioblastoma. MATERIALS AND METHODS: Sixty-eight patients with newly diagnosed pathologically verified GBM were retrospectively evaluated. All patients underwent MRI investigations, including DSC-MRI, surgical procedure and received postoperative focal radiotherapy plus daily temozolomide (TMZ), followed by adjuvant TMZ therapy...
May 2, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29719853/reconstruction-of-white-matter-fibre-tracts-using-diffusion-kurtosis-tensor-imaging-at-1-5t-pre-surgical-planning-in-patients-with-gliomas
#15
Joao Leote, Rita G Nunes, Luis Cerqueira, Ricardo Loução, Hugo A Ferreira
Tractography studies for pre-surgical planning of primary brain tumors is typically done using diffusion tensor imaging (DTI), which cannot resolve crossing, kissing or highly angulated fibres. Tractography based on the estimation of the diffusion kurtosis (DK) tensor was recently demonstrated to enable tackling these limitations. However, its use in the clinical context at low 1.5T field has not yet been reported. Purpose: To evaluate if the estimation of whole-brain tractography using the DK tensor is feasible for pre-surgical investigation of patients with brain tumors at 1...
2018: European Journal of Radiology Open
https://www.readbyqxmd.com/read/29719719/divergent-topological-networks-in-alzheimer-s-disease-a-diffusion-kurtosis-imaging-analysis
#16
Jia-Xing Cheng, Hong-Ying Zhang, Zheng-Kun Peng, Yao Xu, Hui Tang, Jing-Tao Wu, Jun Xu
Background: Brain consists of plenty of complicated cytoarchitecture. Gaussian-model based diffusion tensor imaging (DTI) is far from satisfactory interpretation of the structural complexity. Diffusion kurtosis imaging (DKI) is a tool to determine brain non-Gaussian diffusion properties. We investigated the network properties of DKI parameters in the whole brain using graph theory and further detected the alterations of the DKI networks in Alzheimer's disease (AD). Methods: Magnetic resonance DKI scanning was performed on 21 AD patients and 19 controls...
2018: Translational Neurodegeneration
https://www.readbyqxmd.com/read/29719621/histogram-analysis-of-adc-in-rectal-cancer-associations-with-different-histopathological-findings-including-expression-of-egfr-hif1-alpha-vegf-p53-pd1-and-ki-67-a-preliminary-study
#17
Hans Jonas Meyer, Annekathrin Höhn, Alexey Surov
Functional imaging modalities like Diffusion-weighted imaging are increasingly used to predict tumor behavior like cellularity and vascularity in different tumors. Histogram analysis is an emergent imaging analysis, in which every voxel is used to obtain a histogram and therefore statistically information about tumors can be provided. The purpose of this study was to elucidate possible associations between ADC histogram parameters and several immunhistochemical features in rectal cancer. Overall, 11 patients with histologically proven rectal cancer were included into the study...
April 6, 2018: Oncotarget
https://www.readbyqxmd.com/read/29717790/use-of-diffusion-kurtosis-imaging-and-quantitative-dynamic-contrast-enhanced-mri-for-the-differentiation-of-breast-tumors
#18
Ting Li, Tao Yu, Lyu Li, Lunbo Lu, Yaoyao Zhuo, Jingge Lian, Yun Xiong, Dexing Kong, Kangan Li
BACKGROUND: Breast MRI is a sensitive imaging technique to assess breast cancer but its effectiveness still remains to be improved. PURPOSE: To evaluate the diagnostic performance of diffusion-weighted imaging (DWI), diffusion kurtosis imaging (DKI), and quantitative dynamic contrast-enhanced (DCE)-MRI in differentiating malignant from benign breast lesions independently or jointly and to explore whether correlations exist among these parameters. STUDY TYPE: Retrospective...
May 2, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29716527/differentiation-of-orbital-lymphoma-and-idiopathic-orbital-inflammatory-pseudotumor-combined-diagnostic-value-of-conventional-mri-and-histogram-analysis-of-adc-maps
#19
Jiliang Ren, Ying Yuan, Yingwei Wu, Xiaofeng Tao
BACKGROUND: The overlap of morphological feature and mean ADC value restricted clinical application of MRI in the differential diagnosis of orbital lymphoma and idiopathic orbital inflammatory pseudotumor (IOIP). In this paper, we aimed to retrospectively evaluate the combined diagnostic value of conventional magnetic resonance imaging (MRI) and whole-tumor histogram analysis of apparent diffusion coefficient (ADC) maps in the differentiation of the two lesions. METHODS: In total, 18 patients with orbital lymphoma and 22 patients with IOIP were included, who underwent both conventional MRI and diffusion weighted imaging before treatment...
May 2, 2018: BMC Medical Imaging
https://www.readbyqxmd.com/read/29714231/theoretical-surface-type-classifier-based-on-a-waveform-model-of-a-satellite-laser-altimeter-and-its-performance-in-the-north-of-greenland
#20
Song Li, Wenhao Zhang, Yue Ma, Xiao Hua Wang, Fanlin Yang, Dianpeng Su
Current land-cover classification methods using ICESat/GLAS's (Ice, Cloud, and land Elevation Satellite/Geoscience Laser Altimeter System) datasets are based on empirical thresholds or machine learning by training multiple GLAS parameters, e.g., the reflectivity and elevation of the target and width, amplitude, kurtosis, and skewness of the return waveform. A theoretical classifier is derived based on a waveform model of an actual laser altimeter illuminating the sea surface. With given system parameters and the sea surface wind corresponding to the location of a laser footprint (the wind can be calculated by using the National Centers for Environmental Prediction dataset), a precise theoretical waveform can be generated as a reference...
April 1, 2018: Applied Optics
keyword
keyword
70065
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"