With the emergence of multidetector-row computed tomography (CT) it is now possible to image both structure and function via use of a single imaging modality. Breath-hold spiral CT provides detail of the airway and vascular trees along with texture reflective of the state of the lung parenchyma. Use of stable xenon gas wash-in and/or wash-out methods using an axial mode of the CT scanner whereby images are acquired through gating to the respiratory cycle provide detailed images of regional ventilation with isotropic voxel dimensions now on the order of 0.4 mm. Axial scanning during a breath hold and gating to the electrocardiogram during the passage of a sharp bolus injection of iodinated contrast agent provide detailed images of regional pulmonary perfusion. These dynamic CT methods for the study of regional lung function are discussed in the context of other methods that have been used to study heterogeneity of lung function.
Unlike most user-computer interfaces, a natural language interface allows
users to communicate fluently with a computer system with very little
preparation. Databases are often hard to use in cooperating with the users
because of their rigid interface. A good NLIDB allows a user to enter commands
Compute one of these components (the `most complicated' in a certain sense).
This allows us to prove Kontsevich's homological mirror symmetry conjecture for
This component. We also consider the relationship between the quantum
Cohomology and the Hochschild cohomology of the Fukaya category, and u...
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