1,721,014 research outputs found
Computer aided visual field diagnosis
No full textAn automatic method for VF acquisition is presented. The diagnosis of VF defects is obtained by clever computer implementatio
Metodologie di acquisizione ed analisi del campo visivo: un ausilio per la diagnosi delle vie ottiche
No full textA simple and low-cos device has been realized in order to sample the visual field (VF) within 20° and easy get important neuroophthalmological informations about central perimetry. Some typical techniques of image processing have been applied to the sampled fields in order to extract the main scotoma's features in terms of their shapes, sizes, positions, ecc. Furthermore, we propose some parameters which will help the diagnosis of campimetric lesions such as hemianopsias and quadrantanopsias
Automatic Visual Field: A Software Diagnostic Procedure
No full textA recently developed technique for the automatic acquisition of data on visual field losses was tested, with reliable neuro-ophthalmological parameters, on 300 subjects with and without eye disorders. Algorithms for acquisition and processing of the central visual field were implemented on an IBM-AT personal computer with standard peripherals. The contours of scotomata (visual field losses) were best estimated by probabilistic adaptive enhancement of data sampling in those areas with greater visual variability. Image processing tools were specially designed to extract information concerning the size, shape, position and number of scotomata in the visual field. The diagnosis of wider campimetric lesions required parameters such as symmetry or specularity coefficients, obtainable by analysing the visual field of both eyes. Data obtained were correlated to the pathology involved by univariate statistical tools
B/W and Color Tangent screen automatic campimetry
No full textB/W test is used in daily clinical routine for the reliable informations it gives concerning vascular and oncologic brain diseases. A new automatic technique is also described which examines the patient skill to discriminate one colour against the others along twelve meridians
Quantitation of stretch reflexes by perturbing arm movements
No full textA torque motor controlled by a microcomputer provide mechanical or magnetical stimuli to neurologic patients while the move their upper arms along a circular trajectory. In this way it is possible to standardize both the arm movements, the perturbation and the kind of stretch reflexes elicited
Software tools for automatic analysis of perimetry
No full textAn automatic system for Visual Field acquisition has been set-up. Machine algorithms have been developed for exploration of V.F. losses
Tecniche di ausilio nell'analisi automatica del campo visivo
No full textStatistica automatica delle misure effettuate sui campi visivi dei pazienti della Clinica Neurologica del Policlinico di Rom
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Acquisition and statistical analysis of a computerized campimetric data archive
No full textFor the parameterization of each Visual Field defect, a dedicated software written in Pascal language extracts the main scotoma's features (i.e., position, size, shape, etc) and evaluates dimension and depth of other tipical V.F. defects, such as quadrantanopsia and hemianopsia
- …
