Navegando por Palavras-chave "Software validation"

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    Elaboração e validação de tabela MNREAD para o idioma português
    (Conselho Brasileiro de Oftalmologia, 2005-12-01) Castro, Celina Tamaki Monteiro de [UNIFESP]; Kallie, Christopher Scott; Salomão, Solange Rios [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); University of Minnesota
    PURPOSE: To create and to validate a version of the Minnesota Low Vision Reading Test (MNREAD) acuity chart for the Portuguese language. METHODS: The Minnesota Low Vision Reading Test acuity chart contain 19 sentences (logMAR 0.5 to 1.3) with 60 characters printed on three lines. All the sentences must have the same length with simple vocabulary. A total of 110 sentences were generated. The sentences were presented to 36 subjects (20 adults and 16 children) and mistakes and reading time were marked. 38 sentences were selected for a prototype (MNREAD-P). Sentences with extreme high and low mean reading time, large standard deviation, and with persistent mistakes by subjects were excluded. Validation: Twenty subjects with normal vision (logMAR 0 or 20/20 or better, with best refractive correction) were tested with the MNREAD-P and read a passage of text, representing normal, day-to-day reading. Reading speeds in words per minute were recorded for both the MNREAD and the text passage. RESULTS: Sentences in the MNREAD Portuguese chart are sufficiently consistent to provide reliable measures of reading abilities. Reading speeds for the passage (logMar = 0.6) were 197.8 words/minute and the maximum reading speeds calculated by the MNREAD-P were 200.1 words/minute. The correlation between the two measures was r = 0.82. CONCLUSION: The MNREAD-P was tested on normal vision subjects and the results were the same from the original Minnesota Low Vision Reading Test. The reading speed measured on the MNREAD-P was statistically equivalent to the reading speed of the passage.
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    Estudo comparativo in vitro dos níveis radiográficos de cinza de biomateriais utilizando duas modalidades de imagem digital
    (Universidade Federal de São Paulo (UNIFESP), 2009-06-24) Nobrega, Newton Fernando Sobreira [UNIFESP]; Ajzen, Sergio Aron [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Purpose: To compare direct and indirect methods using the Digora for Windows System and the Adobe Photoshop CS2 System. Methods: Samples were made of dental materials, using a matrix of metallic aluminum structure composed of two blocks coupled by a precision connection. The samples were disposed on a radiographic film and on a protected phosphor plate to be radiographed using the indirect and direct methods. The radiographic images were analyzed by the Digora for Windows system and the Adobe Photoshop system which have 256 shades of gray, followed by the delimitation of the standard area for measuring of the shades of gray. Results: The distribution of the shades of gray, analyzed by the direct and indirect methods, suggested that the greater the distance, the longer the time of exposure. Conclusion: The indirect method was a feasible alternative in the evaluation of radiographical shades of gray in dental materials since it presents significant reproductiveness in 0,2s to 0,5s exposure.
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    Método computadorizado para medida da acuidade visual
    (Conselho Brasileiro de Oftalmologia, 2006-12-01) Arippol, Patrícia Katayama Kjaer [UNIFESP]; Salomão, Solange Rios [UNIFESP]; Belfort, Rubens Junior [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    PURPOSE: To elaborate and to validate a computerized test for visual acuity screening of school-age children. METHODS: We have created a computerized test for visual acuity assessment with optotypes arranged as those of printed logarithmic charts used in ophthalmic clinic. Ninety seven-year-old students, 8 normal adult volunteers and 10 patients from the Strabismus sector of the Federal University of São Paulo were evaluated by the same examiner and submitted to the visual acuity test through printed visual acuity logarithmic tumble E chart and the new computerized test at the same time. Written consent was obtained after clarification about the research project. RESULTS: Statistical analysis showed excellent correlation between the two methods (r>0.75) besides the slight trend of the computerized test to overestimate visual acuity when compared with the gold standard. Sensitivity of the computerized test was 100% (correctly identified 6 eyes with poor visual acuity) and specificity was 94%. CONCLUSION: The computerized test can be used as a new clinical tool for visual acuity screening of school-age children and it is fast, easy to perform and inexpensive, besides being more attractive for children. The method releases the examiner from the interpretation of the subject's answers and ensures the procedure's standardization even when more than one examiner performs the test. To better understand the effectiveness of this method for visual screening, one option would be to introduce it in elementary schools, after training the teachers to perform this test.