ABSTRACT
We report testing of the new absolute method of photodetector calibration based on the difference-signal measurement for two-mode squeezed vacuum by comparison with the traditional absolute method based on coincidence counting. Using low-gain parametric downconversion, we have measured the quantum efficiency of a counting detector by both methods. The difference-signal method was adapted for the counting detectors by taking into account the dead-time effect.
ABSTRACT
In the review we offer analysis of the effectiveness of carotid endarterectomy in treatment of post-functional apoplexy or stroke patients. Published results of the researches specify possible efficiency of carotid endarterectomy in preventive maintenance against repeated apoplectic attack or strokes. Yet the criteria of usage and execution of the carotid endarterectomy are still to be discussed.
Subject(s)
Atherosclerosis/surgery , Brain Ischemia/prevention & control , Carotid Artery Diseases/surgery , Carotid Artery, External/surgery , Endarterectomy, Carotid/methods , Atherosclerosis/complications , Brain Ischemia/etiology , Carotid Artery Diseases/complications , Humans , Secondary Prevention , Treatment OutcomeABSTRACT
The review is dedicated to the most commonly used method of protecting the brain in carotid endarterectomy, i. e. using an intraluminal temporary bypass (ITB), also containing the information concerning the constructions of ITBs, various points of view regarding practical application thereof, as well as the methods of monitoring the functions of the brain in order to solve the problem concerning feasibility of using an ITB.
