نتایج جستجو برای: adc map

تعداد نتایج: 201565  

Journal: :Journal of magnetic resonance imaging : JMRI 2015
Andrew B Rosenkrantz Michael J Triolo Jonathan Melamed Henry Rusinek Samir S Taneja Fang-Ming Deng

PURPOSE To retrospectively assess the utility of whole-lesion apparent diffusion coefficient (ADC) metrics in characterizing the Gleason 4 component of Gleason 7 prostate cancer (PCa) at radical prostatectomy. MATERIALS AND METHODS Seventy patients underwent phased-array coil 3T-magnetic resonance imaging (MRI) before prostatectomy. A uropathologist mapped locations and Gleason 4 percentage (...

Journal: :iranian journal of radiology 0
mahsa raisi-nafchi department of radiology technology, school of allied medical sciences, shahid beheshti university of medical sciences, tehran, iran fariborz faeghi department of radiology technology, school of allied medical sciences, shahid beheshti university of medical sciences, tehran, iran; department of radiology technology, school of allied medical sciences, shahid beheshti university of medical sciences, tehran, iran alireza zali department of neurosurgery, functional neurosurgery research center, shohada tajrish hospital, shahid beheshti university of medical sciences, tehran, iran hamidreza haghighatkhah department of radiology, shohada tajrish hospital, shahid beheshti university of medical sciences, tehran, iran jalal jalal-shokouhi jam-e-jam medical imaging center, tehran, iran

background diffusion-weighted imaging (dwi) is a form of magnetic resonance imaging (mri) based on measuring the random brownian motion of water molecules within the biological tissues and is particularly useful in tumor characterization. objectives the purpose of this study was to evaluate the diagnostic value of dw mri and the apparent diffusion coefficient (adc) for preoperative grading of a...

2005
N. Shah S. Arora

This paper analyses a method by which chaos is generated using electronic circuits. The chaos generator required for this purpose is based on utilizing the one dimensional piece wise linear Bernoulli Shift map. The iterative map is realized using a feedback system consisting of programmable amplifier and a unity-gain sample-and-hold amplifier. The sample and hold amplifier provides necessary de...

ژورنال: :فیض 0
رضا خلت آبادی فراهانی reza farahani kheltabadi رضوان منیری rezvan moniri department of microbiology & immunology, kashan university of medical sciencesگروه میکروب شناسی و ایمنولوژی دانشگاه علوم پزشکی کاشان غلامرضا شجری gholam reza shajari محمد حسین ناظم شیرازی mohammad hossein nazem shirazi سید غلامعباس موسوی sayed gholam abbas musavi احمد قاسمی ahmad ghasemi سحرناز حاج آقازاده

سابقه و هدف: گونه­های اسینتوباکتر کوکوباسیل پاتوژن های مهم فرصت طلب و مسئول عفونت های بیمارستانی متعددی می باشند. سویه­های مقاوم اسینتوباکتر مشکلات درمانی را در دنیا ایجاد نموده اند. مقاومت آنتی بیوتیکی گونه های اسینتوباکتر در ایران یک مشکل نوظهور است. هدف از این مطالعه تعیین حساسیت ضد میکروبی و ارزیابی وجود ژن های مقاومت درگونه­های اسینتوباکتر جدا شده از نمونه های بالینی از بیمارستان آموزشی دا...

Journal: :Acta radiologica 2012
Philipp Wiggermann Robert Grützmann Angelika Weissenböck Peter Kamusella Dag-Daniel Dittert Christian Stroszczynski

BACKGROUND Mass-forming focal pancreatitis (FP) may mimic pancreatic cancer (PC) on magnetic resonance (MR) imaging, and the preoperative differential diagnosis is often difficult. Recently, the usefulness of diffusion-weighted imaging (DWI) in the diagnosis of pancreatic cancer has been reported in several studies. PURPOSE To investigate if apparent diffusion coefficient (ADC) measurements b...

Journal: :Vojnosanitetski pregled 2015
Jelena Ignjatović Dragan Stojanov Vladimir Zivković Srdjan Ljubisavljević Nebojša Stojanović Ivan Stefanović Daniela Benedeto-Stojanović Nebojša Ignjatović Sladjana Petrović Aleksandra Aracki-Trenkić Zoran Radovanović Lazar Lazović

BACKGROUND/AIM Magnetic resonance imaging (MRI) is a key modality not only for lesion diagnosis, but also to evaluate the extension, type and grade of the tumor. Advanced MRI techniques provide physiologic information that complements the anatomic information available from conventional MRI. The aim of this study was to determine whether there is a correlation between apparent diffusion coeffic...

2016
Dariya I. Malyarenko Lisa J. Wilmes Lori R. Arlinghaus Michael A. Jacobs Wei Huang Karl G. Helmer Bachir Taouli Thomas E. Yankeelov David Newitt Thomas L. Chenevert

Previous research has shown that system-dependent gradient nonlinearity (GNL) introduces a significant spatial bias (nonuniformity) in apparent diffusion coefficient (ADC) maps. Here, the feasibility of centralized retrospective system-specific correction of GNL bias for quantitative diffusion-weighted imaging (DWI) in multisite clinical trials is demonstrated across diverse scanners independen...

2017
Toshio Ohashi Shinji Naganawa Mai Kanou Mitsuru Ikeda

PURPOSE Diffusion-weighted imaging (DWI) using readout-segmented EPI (rs-EPI) can minimize distortion and blurring artifacts; however, we sometimes encounter cerebrospinal fluid (CSF) pulsation artifacts on apparent diffusion coefficient (ADC) maps, especially when the number of readout segments (NRS) is increased. The purpose of this study was to evaluate the effect of the NRS on the CSF pulsa...

2016
Sara Reis Teixeira Paula Condé Lamparelli Elias Andrea Farias de Melo Leite Tatiane Mendes Gonçalves de Oliveira Valdair Francisco Muglia Jorge Elias Junior

OBJECTIVE To assess the feasibility and reliability of apparent diffusion coefficient (ADC) measurements of normal adrenal glands. MATERIALS AND METHODS This was a retrospective study involving 32 healthy subjects, divided into two groups: prepubertal (PreP, n = 12), aged from 2 months to 12.5 years (4 males; 8 females); and postpubertal (PostP, n = 20), aged from 11.9 to 61 years (5 males; 1...

Journal: :Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine 2014
Tomoyuki Hida Akihiro Nishie Yoshiki Asayama Kousei Ishigami Yasuhiro Ushijima Yukihisa Takayama Nobuhiro Fujita Dai Shimamoto Akira Yokomizo Katsunori Tatsugami Junichi Inokuchi Yuichiro Kubo Hiroshi Honda

PURPOSE Using pathologically proven tumors and 3 methods of apparent diffusion coefficient (ADC) measurement, we examined the potential of diffusion-weighted imaging (DWI) to differentiate adrenal tumors. METHODS We evaluated adrenal tumors of 52 patients who underwent magnetic resonance (MR) examination including DWI and adrenal resection or biopsy between July 2006 and August 2011. Tumors i...

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