نتایج جستجو برای: enhancement ratio

تعداد نتایج: 621077  

2015
Qing Lu Bei-jian Huang Wen-ping Wang Cui-xian Li Li-yun Xue

OBJECTIVE To evaluate the value of enhancement features and quantitative parameters of contrast-enhanced ultrasonography (CEUS) in differentiating solid hypoechoic renal angiomyolipomas (AMLs) from clear cell renal cell carcinomas (ccRCCs). MATERIALS AND METHODS We analyzed the enhancement features and quantitative parameters of CEUS in 174 hypoechoic renal masses (32 AMLs and 142 ccRCCs) inc...

Journal: :Neuro-oncology 2013
Kourosh M Naeini Whitney B Pope Timothy F Cloughesy Robert J Harris Albert Lai Ascia Eskin Reshmi Chowdhury Heidi S Phillips Phioanh L Nghiemphu Yalda Behbahanian Benjamin M Ellingson

BACKGROUND Subtypes of glioblastoma multiforme (GBM) based on genetic and molecular alterations are thought to cause alterations in anatomic MRI owing to downstream biological changes, such as edema production, blood-brain barrier breakdown, and necrosis. The purpose of the current study was to identify a potential relationship between imaging features and the mesenchymal (MES) GBM subtype, whi...

Journal: :IEICE Transactions 2011
Yu Gwang Jin Nam Soo Kim Joon-Hyuk Chang

In this letter, we propose a novel speech enhancement algorithm based on data-driven residual gain estimation. The entire system consists of two stages. At the first stage, a conventional speech enhancement algorithm enhances the input signal while estimating several signalto-noise ratio (SNR)-related parameters. The residual gain, which is estimated by a data-driven method, is applied to furth...

2012
S. Toroghi P. G. Kik

Cascaded optical field enhancement in coupled plasmonic nanostructures has attracted significant attention because of field enhancement factors that dramatically exceed those observed in isolated nanostructures. While previous studies demonstrated the existence of cascaded enhancement, little work has been done to identify the requirements for achieving maximum field enhancement. Here, we inves...

Journal: :Magnetic resonance in medicine 2014
Xia Li Lori R Arlinghaus Gregory D Ayers A Bapsi Chakravarthy Richard G Abramson Vandana G Abramson Nkiruka Atuegwu Jaime Farley Ingrid A Mayer Mark C Kelley Ingrid M Meszoely Julie Means-Powell Ana M Grau Melinda Sanders Sandeep R Bhave Thomas E Yankeelov

PURPOSE The purpose of this pilot study is to determine (1) if early changes in both semiquantitative and quantitative DCE-MRI parameters, observed after the first cycle of neoadjuvant chemotherapy in breast cancer patients, show significant difference between responders and nonresponders and (2) if these parameters can be used as a prognostic indicator of the eventual response. METHODS Twent...

2015
H. I. Ashiba H. M. Mansour

This paper proposes a novel enhancement method for infrared images (IR) .This algorithm based on contrast limited adaptive histogram equalization (CLAHE) that adaptive and improves infrared images. Some attempts are proposed for enhancement of infrared images using this model, since infrared images have several many applications, it is expected that CLAHE would be better in their enhancement th...

Journal: :Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine 2008
Takashi Okafuji Hidetake Yabuuchi Hiroyasu Soeda Yoshio Matsuo Takeshi Kamitani Shuji Sakai Masamitsu Hatakenaka Syoji Kuroki Eriko Tokunaga Hidetaka Yamamoto Hiroshi Honda

PURPOSE We evaluated the magnetic resonance (MR) features of breast lesions showing circumscribed mass on mammography to understand the characteristics that differentiate malignancy and benignancy. MATERIALS AND METHODS Our institutional review board approved the study, and informed consent was waived. Using logistic regression analysis, we examined morphologic and kinetic MR imaging data of ...

H. Aghaeinia, V. Vakil,

The throughput enhancement of Space-Time Spreading (STS)-based Multicarrier Direct Sequence Code Division Multiple Access (MC DS-CDMA) system is investigated in this paper. Variable Spreading Factor (VSF) is utilized to improve the data throughput of the system. In this contribution, an analytical approach is proposed to compute a new expression for the Bit Error Rate (BER) performance of t...

Journal: :IEEE Journal of Translational Engineering in Health and Medicine 2020

Journal: :Japanese Journal of Radiological Technology 2014

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