Carlos A Varon

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Dual-energy (DE) imaging of the chest improves the conspicuity of subtle lung nodules through the removal of overlying anatomical noise. Recent work has shown double-shot DE imaging (i.e., successive acquisition of low- and high-energy projections) to provide detective quantum efficiency, spectral separation (and therefore contrast), and radiation dose(More)
RATIONALE AND OBJECTIVES To assess the performance of an experimental prototype dual-energy (DE) chest imaging system in comparison to digital radiography (DR) in detection and characterization of lung lesions using receiver-operating characteristic (ROC) tests. MATERIALS AND METHODS A cohort of 129 patients (80 M, 49 F; mean age, 64.8 years) was drawn(More)
RATIONALE AND OBJECTIVES The aim of this study was to assess the performance of a newly developed dual-energy (DE) chest radiographic system in comparison to digital radiographic (DR) imaging in the detection and characterization of lung nodules. MATERIALS AND METHODS An experimental prototype was developed for high-performance DE chest imaging, with(More)
INTRODUCTION AND PURPOSE Detection of beta-lactam resistance in Escherichia coli and Klebsiella pneumoniae strains is clinically relevant. Moreover, it is important to differentiate between extended-spectrum beta-lactamase (ESBL) production and other mechanisms of resistance to avoid inadequate treatment of infection caused by these strains. The aim of this(More)
PURPOSE To improve the sensitivity and accuracy of contrast-enhanced CT measurements by using atomic number extraction of Iodine-based contrast agent concentration from dual energy CT (DECT) material decomposition. METHODS Dual energy scans of different levels of CT contrast agent concentrations (range 0- 67.5 mgI/mL) were acquired in a body phantom on a(More)
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