MRI-visible perivascular spaces (PVS) in centrum semiovale white matter (CS) have been proposed as a novel neuroimaging marker for cerebral amyloid angiopathy (CAA). Progressive b-amyloid deposition in small cortical and leptomeningeal arteries in CAA may gradually impair perivascular drainage and cause retrograde PVS dilation. We describe the neuroimaging findings of 2 patients who were diagno...

objectives: the purpose of this study was to compare the accuracy of implant position transfer and surface detail reproduction using two impression techniques and materials. materials and methods: a metal model with two implants and three grooves of 0.25, 0.50 and 0.75 mm in depth on the flat superior surface of a die was fabricated. ten regular-body polyether (pe) and 10 regular-body polyvinyl...

IMPORTANCE Commercially available automated vision screening devices assess refractive risk factors, not amblyopia or strabismus, underreferring affected children and overreferring healthy children. Nearly half of affected children are not identified until after age 5 years, when treatment is less effective. OBJECTIVES To determine the diagnostic accuracy of the Pediatric Vision Scanner (PVS)...

Treatment of symptomatic and drug-refractory atrial fibrillation (AF) by ablation has been established as a feasible and effective therapy option. Since Haissaguerre’s landmark findings demonstrating that electrical activity of pulmonary veins (PVs) play a crucial role in the initiation of paroxysmal AF [1], electrical isolation of PVs remain the primary goal in all ablative strategies. Despite...

A metamodel expresses the syntactic well-formedness constraints that all models written using the notation of a modelling language must obey. We formally capture the metamodel for an industrial-strength object-oriented modelling language, BON, using the PVS specification language. We discuss how the PVS system helped in debugging the metamodel, and show how to use the PVS theorem prover for con...

Often, theorem checkers like PVS are used to check an existing proof, which is part of some document. Since there is a large diierence between the notations used in the documents and the notations used in the theorem checkers, it is usually a laborious task to convert an existing proof into a format which can be checked by a machine. In the system that we propose, the author is assisted in the ...

BACKGROUND There are many people living in a permanent vegetative state in the United States. We report the first case of a patient in permanent vegetative state (PVS) who developed paroxysmal sympathetic hyperactivity (sympathetic storm) 8 months after the hypoxic brain injury that lead to PVS. DISCUSSION Paroxysmal sympathetic hyperactivity is a relatively common complication early in the c...

PVS is now 15 years old, and has been extensively used in research, industry, and teaching. The system is very expressive, with unique features such as predicate subtypes, recursive and corecursive datatypes, inductive and coinductive definitions, judgements, conversions, tables, and theory interpretations. The prover supports a combination of decision procedures, automatic simplification, rewr...

An approach is presented to integrate PVS executable specifications and Stateflow models. It uses web services to enable a seamless exchange of simulation events and data between PVSio and Stateflow. The approach’s effectiveness is demonstrated on a medical device prototype. The prototype’s user interface is a PVS specification with its software controller implemented in Stateflow. Using the we...

The Princeton Variability Survey (PVS) is a robotic survey which makes use of readily available, “off-the-shelf” type hardware products, in conjunction with a powerful set of commercial software products, in order to monitor and discover variable objects in the night sky. The main goal of the PVS has been to devise an automated telescope and data reduction system, requiring only moderate techni...