To evaluate the evidence for the use of spiral volumetric computed tomography (SVCT) in the diagnosis of acute pulmonary embolism (PE), the 11 English-language studies published through July 1998 that compared SVCT with a reference standard for PE were systematically reviewed. Among the reviewed studies, methodological problems were common. Only 5 of these studies fulfilled 5 of 11 basic standa...

Objectives- to provide a reference anatomy of the bronchial tree of the Jebeer Gazelle by using computed tomographic modality. Design- Experimental study. Animals- Three female Jebeer Gazelle Procedures- Spiral CT images were taken from the thoracic region perpendicular to long axis of the body. CT windows were adjusted as necessary to have optimized images of pulmonary organ. The images ...

Introduction Spiral coils have been used for various MRI applications as single-channel coils and array coils. Archimedes introduced a special type of spiral [1] consisting of two arms or more as shown in Fig. 1. The Archimedean spiral geometry has not been studied for MRI applications according to the literature reported. Computer simulations of the magnetic field for different Archimedean spi...

In this paper, we study the existence of steadily rotating spiral waves in the kinematic theory of excitable media. The spiral wave is assumed to be a family of curves. It rotates along a circle with a constant speed such that the tip of the curve neither grows nor retracts in the tangential direction. Using an analytical approach, we are able to derive the existence and non-existence of spiral...