Purpose. This study investigated the impact of the different region of interest (ROI) approaches on measurement of apparent diffusion coefficient (ADC) values in the breast firbroglandular tissue (FT). Methods. Breast MR images of 38 women diagnosed with unilateral breast cancer were studied. Percent density (PD) and ADC were measured from the contralateral normal breast. Four different ROIs we...

BACKGROUND AND PURPOSE CO(2) response was examined in rats undergoing 60 minutes of middle cerebral artery occlusion (MCAO) and 4.5 hours of reperfusion. Because it is not clear whether the vasoreactivity improves during reperfusion in parallel with tissue recovery, CO(2) response was determined spatially resolved, sequentially in the initially ischemic but later recovered areas and in the perm...

PURPOSE The purpose of this study was to evaluate the cerebral hemodynamic change in the hyperacute stage of cerebral fat embolism induced by triolein emulsion, by using MR perfusion imaging in cat brains. METHODS By using the femoral arterial approach, the internal carotid arteries of 14 cats were infused with an emulsion of triolein 0.05 mL. T2-weighted (T2WI), diffusion-weighted (DWI), app...

OBJECTIVE To determine whether a change in apparent diffusion coefficient (ADC) value could predict early response to CT-guided Oxygen-Ozone (O2-O3) injection therapy in patients with unilateral mono-radiculopathy due to lumbar disc herniation. MATERIALS AND METHODS A total of 52 patients with unilateral mono-radiculopathy received a single intradiscal (3 mL) and periganglionic (5 mL) injecti...

Introduction There has been considerable interest in the use of diffusion weighted imaging (DWI) to detect the site and size of ischemic lesions in acute stroke patients [1, 2]. This information assists in classifying the stroke age and may also be useful in predicting the clinical outcome [3]. The measurement of infarct volume has an important role to play in: (a) decision-making in acute stro...

This paper presents the design and implementation of a 2.5V 12-hit high performance and low cost pipeline Analog-to-Digital converter (ADC) architecture using CMOS technology. A modified flash ADC was employed instead of the traditional flash ADC to implement the sub-ADC in the designed pipeline ADC scheme to reduce the device complexity and attain lower system power consumption. The designed p...

a b Figure 4: Pre(a) and post-treatment (b) arterial enhancement color maps overlaid on arterial phase DCE images. Enhancement increases from blue to red (Green = intermediate) b a Figure 3: ADC analysis. Color map of changes in ADC overlaid on ADC image (a), and scatter plot (b). Red = increased ADC, Blue = decreased ADC (Green = intermediate) Introduction: The RECIST criteria have been the go...

This paper introduces three popular analog-to-digital converter (ADC) architectures to readers: the flash ADC, the multi-step flash ADC, and the pipeline ADC. The fundamental operating principles of these three architectures are described. The specific topic of interest of this paper is methods of improving ADC accuracy. For the flash ADC, the concept of 2X interpolation to increase ADC resolut...