نتایج جستجو برای: adc

تعداد نتایج: 6994  

Journal: :AJNR. American journal of neuroradiology 2001
J M Provenzale J R Petrella L C Cruz J C Wong S Engelter D P Barboriak

BACKGROUND AND PURPOSE Previous studies have shown that lesions in posterior reversible encephalopathy syndrome are often isointense on diffusion-weighted MR images. We hypothesized that 1) apparent diffusion coefficient (ADC) maps using various thresholds would show larger abnormalities in posterior white matter (WM) and 2) isointense appearance of lesions on isotropic diffusion-weighted image...

Journal: :AJNR. American journal of neuroradiology 2001
M G Lansberg V N Thijs M W O'Brien J O Ali A J de Crespigny D C Tong M E Moseley G W Albers

BACKGROUND AND PURPOSE Serial study of such MR parameters as diffusion-weighted imaging (DWI), apparent diffusion coefficient (ADC), ADC with fluid-attenuated inversion recovery (ADC(FLAIR)), and T2-weighted imaging may provide information on the pathophysiological mechanisms of acute ischemic stroke. Our goals were to establish the natural evolution of MR signal intensity characteristics of ac...

2015
Hasmayadi Abdul Majid

This paper presents the development of a 38.5 kS/s 10-bit programmable reference SAR ADC which is in MIMOS’s 0.35 μm CMOS process. The design uses a resistive DAC, a dynamic comparator with pre-amplifier and logic to create 10 effective bits ADC. A programmable reference circuitry allows the ADC to operate with different input ra 0.6 V to 2.1 V. The ADC consumed less than 7.5 mW power with a 3 ...

2001
Dewen Yang

Feasibility of obtaining reliable and reproducible ADC maps in rat kidneys at 7 Tesla, and the effect of renal blood flow on ADC is investigated. A spin echo DWI sequence with respiratoly gating gave reproducible ADC maps with no significant differences between right and left kidneys. ADC of cortex and medulla in readout and phase direction were higher than that in slice direction (P<O.Ol, n=12...

Journal: :AJNR. American journal of neuroradiology 2014
S F Kralik A Taha A P Kamer J S Cardinal T A Seltman C Y Ho

BACKGROUND AND PURPOSE Supratentorial tumors in the first year of life are typically large and heterogeneous at presentation, making differentiation of these CNS neoplasms on pre-operative imaging difficult. We hypothesize that the ADC value can reliably differentiate high- versus low-grade supratentorial tumors in this patient population. MATERIALS AND METHODS A blinded review of ADC maps wa...

Journal: :American journal of physiology. Heart and circulatory physiology 1998
Edward W Hsu Rong Xue Alex Holmes John R Forder

The apparent diffusion coefficient (ADC) of water after regional myocardial ischemia was measured in isolated, perfused rabbit hearts by using magnetic resonance imaging (MRI) techniques. After ligation of the left anterior descending coronary artery, the ADC of the nonperfused region showed a gradual but significant decreasing trend over time, whereas that of the normally perfused myocardium r...

2005
Christopher R. Anderson Jeffrey H. Reed

A Software Defined Radio for Ultra Wideband (UWB) communication systems places several stringent requirements on the Analog to Digital Converter (ADC). The ADC must have a sufficiently fast sampling frequency and SNR to accurately reconstruct the received UWB pulse. Such an ADC can be prohibitively expensive, as well as challenging to interface with a DSP or FPGA. An alternative approach is to ...

Journal: :Journal of gastrointestinal and liver diseases : JGLD 2015
Cosmin Caraiani Liliana Chiorean Diana Ioana Fenesan Andrei Lebovici Diana Feier Mirela Gersak Adriana Mirela Calin Marian Dan Claudia Militaru Codruta Mare Lidia Ciobanu Radu Badea

BACKGROUND AND AIMS To assess the role of diffusion weighted imaging sequence (DWI), routinely used in hepatic magnetic resonance imaging (MRI) for the differentiation of focal liver lesions (FLLs) as benign or malignant. METHOD 99 FLLs assessed by liver MRI in 80 patients were included in the present study. All lesions were retrospectively analyzed by two experienced radiologists, independen...

Journal: :AJNR. American journal of neuroradiology 2011
J K Park S-E Kim G S Trieman D Parker E-K Jeong

BACKGROUND AND PURPOSE 2D-ss-IMIV-DWEPI is an ss-DWEPI with greatly reduced geometric distortion. The purposes of this paper are to 1) evaluate of the utility of 2D-ss-IMIV-DWEPI for high-resolution neck LN imaging; 2) determine whether 2D-ss-IMIV-DWEPI can depict normal LN hilum; and 3) evaluate whether the inclusion of LN hilum within ROIs affects the measured LN ADC. MATERIALS AND METHODS ...

2017
Fereshteh Hasanzadeh Fariborz Faeghi Abdollah Valizadeh Leyla Bayani

Objective: To evaluate the diagnostic value of diffusion weighted magnetic resonance imaging (DW-MRI) in assessment of metastases in axillary lymph nodes (ALNs) in a sample of Iranian women with breast cancer. Methods: A total of 50 axillary lymph nodes from 30 female patients with histologically verified breast cancer were assessed by 1.5 T MRI. DWI was implemented at b-values of 50, 400 and 8...

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