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Fractal and non-fractal theories predict universal designs for biological branching transport networks whereby energy dissipation is minimized. However, they are inadequate to account for adaptation via designs that appear sub-optimal. Therefore we have evaluated another theory in the developing lung which is based on bifurcation design and the principle of(More)
Comparison of uncompressed volumetric breast data to compressed projection mammographic data poses a variety of challenges to accurately localize anatomy in both data sets. This work presents a method for simulating the mechanical compression of volumetric breast data. We use an approach based on a rectilinear-grid finite-element mesh and apply the method(More)
The purpose of this study was to evaluate the anatomy of the cerebral circulation, particularly the circle of Willis, using three-dimensional ultrasound (3DUS) imaging. Image data were obtained through the right transtemporal window from 8 young, healthy volunteers by acquiring gray-scale and color Doppler spectral (CDI) and energy (CDE) images using(More)
Magnetic resonance imaging demands that tissue contrast and signal-to-noise advantages be sought in each component of the imaging system. One component of magnetic resonance imaging in which contrast and signal-to-noise ratios are easily manipulated is in the choice of pulse sequences and interpulse delay times. This article provides a general method for(More)
Quantum cascade laser (QCL) is a specific type of semiconductor laser that operates through principles of quantum mechanics. Because there is a genuine lack of compact and coherent devices which can operate in the far-infrared region the motivation exists for designing a terahertz (THz) QCL. To ensure operation in the THz region the device must conform to(More)