نتایج جستجو برای: adc
تعداد نتایج: 6994 فیلتر نتایج به سال:
PURPOSE We aimed to evaluate the apparent diffusion coefficient (ADC) values of metastatic lymph nodes in patients with squamous cell carcinoma (SCC) of the head and neck. METHODS Patients with metastatic lymph nodes underwent 1.5 Tesla diffusion-weighted magnetic resonance imaging (MRI). The ADC values of the histologically proven metastases were evaluated retrospectively and mean ADC values...
Conventional two-step ADC for CMOS image sensor requires full resolution noise performance in the first stage single slope ADC, leading to high power consumption and large chip area. This paper presents an 11-bit two-step single slope/successive approximation register (SAR) ADC scheme for CMOS image sensor applications. The first stage single slope ADC generates a 3-bit data and 1 redundant bit...
BACKGROUND AND PURPOSE Currently it is difficult to predict tumor response to anti-angiogenic therapy in individual patients. Our aim was to determine if ADC histogram analysis can stratify progression-free and overall survival in patients with newly diagnosed GBM treated "up-front" (ie, before tumor recurrence) with bevacizumab. MATERIALS AND METHODS Up-front bevacizumab-treated and control ...
PURPOSE We aimed to compare two different methods of region of interest (ROI) demarcation and determine interobserver variability on apparent diffusion coefficient (ADC) in breast lesions. METHODS Thirty-two patients with 39 lesions were evaluated with a 3.0 Tesla scanner using a diffusion-weighted sequence with several b-values. Two observers independently performed the ADC measurements usin...
BACKGROUND AND PURPOSE Diffusion-weighted (DW) MR imaging is a means to characterize and differentiate morphologic features, including edema, necrosis, and tumor tissue, by measuring differences in apparent diffusion coefficient (ADC). We hypothesized that DW imaging has the potential to differentiate recurrent or progressive tumor growth from treatment-induced damage to brain parenchyma in hig...
Abstract Objective To quantitatively compare the diagnostic and differential value of intra-voxel incoherent motion imaging (IVIM) diffusion weighted (DWI) for prostate cancer (PCa) benign prostatic hyperplasia (BPH). Methods 68 cases confirmed by pathology, including 33 PCa 35 BPH were analyzed retrospectively. All patients underwent T1WI, T2WI, DWI IVIM sequences to obtain apparent coefficien...
Lineage transition in adenocarcinoma (ADC) and squamous cell carcinoma (SCC) of non-small cell lung cancer, as implicated by clinical observation of mixed ADC and SCC pathologies in adenosquamous cell carcinoma, remains a fundamental yet unsolved question. Here we provide in vivo evidence showing the transdifferentiation of lung cancer from ADC to SCC in mice: Lkb1-deficient lung ADC progressiv...
The “Split ADC” architecture enables fully digital calibration and correction of nonlinearity errors due to capacitor mismatch in a Successive Approximation (SAR) ADC. The die area of a single ADC design is split into two independent halves, each converting the same input signal. Total area and power is unchanged, resulting in minimal increase in analog complexity. For each conversion, the half...
Diffusion-weighted imaging estimates of apparent diffusion coefficient (ADC) have shown sensitivity to brain tumor cellularity as well as response to therapy. Functional diffusion maps (fDMs) exploit these principles by examining voxelwise changes in ADC within the same patient over time. Currently, the fDM technique involves linear image registration of ADC maps from subsequent follow-up times...
Folding and interpolation ADC has been shown to be an important means of digitization of high BW signals at intermediate resolution. The objective of this paper is to design and identify the performance of the ADC. Flash ADC is one of the faster ways to convert any analog signal to a digital signal. It uses folding and interpolating techniques allow each comparator of the ADC to be reused sever...
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