نتایج جستجو برای: adc

تعداد نتایج: 6994  

Introduction: Glioma is the most common primary malignancy of cerebral neoplasms in adults, which in spite of therapeutic significant efforts, has a very poor prognosis. The current standard treatment of these patients generally includes surgery and radiotherapy or concurrent chemoradiotherapy with 6 courses of adjuvant use of temozolomide tabs. During these years, the nervous...

Journal: :Radiology 2009
Whitney B Pope Hyun J Kim Jing Huo Jeffry Alger Matthew S Brown David Gjertson Victor Sai Jonathan R Young Leena Tekchandani Timothy Cloughesy Paul S Mischel Albert Lai Phioanh Nghiemphu Syed Rahmanuddin Jonathan Goldin

PURPOSE To determine if apparent diffusion coefficient (ADC) histogram analysis can stratify progression-free survival in patients with recurrent glioblastoma multiforme (GBM) prior to bevacizumab treatment. MATERIALS AND METHODS The study was approved by the institutional review board and was HIPAA compliant; informed consent was obtained. Bevacizumab-treated and control patients (41 per coh...

Journal: :AJNR. American journal of neuroradiology 2013
F E Valles C L Perez-Valles S Regalado R F Barajas J L Rubenstein S Cha

BACKGROUND AND PURPOSE ADC derived from DWI has been shown to correlate with PFS and OS in immunocompetent patients with PCNSL. The purpose of our study was to confirm the validity of ADC measurements as a prognostic biomarker and to determine whether rCBV measurements derived from DSC perfusion MR imaging provide prognostic information. MATERIALS AND METHODS Pretherapy baseline DWI and DSC p...

2013
Xiaohang Liu Weijun Peng Liangping Zhou He Wang

OBJECTIVE To investigate the biexponential apparent diffusion parameters of diverse prostate tissues and compare them with monoexponential apparent diffusion coefficient (ADC) value in the efficacy to discriminate prostate cancer from benign lesions. MATERIALS AND METHODS Eleven healthy volunteers and 61 patients underwent a conventional (b-factors 0, 1000 s/mm(2)) and a 10 b-factor (0 to 300...

2016

BACKGROUND AND PURPOSE: Although targeted by radiotherapy, recurrence in glioblastoma occurs mainly periresectional due to tumour infiltration. An increase in ADC is shown posttreatment in the large high T2 area, however, until now ADC has not been investigated for the more relevant directly periresectional area. METHODS: Histogram analysis was used to assess periresectional ADC values in gliob...

2012
Bhawana Garg

Analog to digital converters are Mixed signal devices. With the increasing popularity of these devices , it is important to get more faster and accurate device. Along with design, testing of ADC plays major role . Static and Dynamic methods are available for ADC testing. Ideal ADC itself has quantization error. A NonIdeal ADC consists many other errors like offset error, Gain error, DNL, INL,EN...

2001
O A Mukhanov V K Semenov I V Vernik A M Kadin T V Filippov D Gupta D K Brock I Rochwarger Y A Polyakov

We have designed, fabricated and tested the second-generation (2G) design of a high-resolution, dynamically programmable analog-to-digital converter (ADC) for radar and communications applications. The ADC chip uses the phase modulation–demodulation architecture and on-chip digital filtering. The 2G ADC design has been substantially enhanced. Both ADC front-end modulator and demodulator, as wel...

2004
Martí Sánchez-Fibla Pedro Meseguer Javier Larrosa

ADC • ADC is the reference algorithm to solve CSP by complete inference • ADC is a specialization of bucket elimination, a more general algorithm used in optimization • The time and space complexity of ADC are exponential on the problem induced width w∗. • ADC follows a Dynamic Programming schema and computes all solutions • Two basic operations: • Join. c 1 r is a new constraint with scope var...

2014
Boeun Kim Kangjae Yi Sunyoung Jung Seoyeon Ji Mincheol Choi Junghee Yoon

Diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC) mapping are functional magnetic resonance imaging techniques for detecting water diffusion. DWI and the ADC map were performed for intracranial lesions in two dogs. In necrotizing leukoencephalitis, cavitated lesions contained a hypointense center with a hyperintense periphery on DWI, and hyperintense signals on the ADC m...

2016
Shu Liu Fuxi Zhen Nana Sun Jiayan Chen Yuandong Cao Sheng Zhang Hongyan Cheng Xiaolin Ge Xinchen Sun

PURPOSE Previous studies have demonstrated that apparent diffusion coefficient (ADC) values measured by magnetic resonance imaging have prognostic value in patients with esophageal squamous cell carcinoma (ESCC). However, the role of ADC needs to be validated in a cohort of Chinese ESCC patients. This study assessed the role of ADC in predicting the outcome of patients with ESCC treated only by...

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