{"status":"OK","msg":"Details loaded!","presentation":{"id":105,"title":"Digitization Method for Radiographic Films Through Silver Intensity Mapping Using X-ray Fluorescence","abstract":"The Hurter & Dri\ufb03eld curve, primary tool for evaluation of characteristics of radiographic \ufb01lms is de\ufb01ned as the optical density as function of exposure. This optical density is traditionally measured by the transmittance of a beam light across the \ufb01lm, and its response is important to understand the \ufb01lm behaviour in sensitometry, in scanning by optical scanners and also in the viewing with our eyes against a light source such as light box. There are many mathematical and computational models to characterize the behaviour of this curve and its properties, but is not among them some models that consider the interference that the equipment used can have about sensitometric curves. When trying to adjust curves from theoretical models to experimental data, it was estimated that, for high exposure values, there was inconsistency between data, and this inconsistency would suggest a limitation in optical density. When trying to make the measurement of silver depending on exposure through another method than optical, such as X-rays \ufb02uorescense, it was realized that these data was reasonably agree with the models, and that the limitation in optical density is mainly caused by its measurement. The objectives of this work were: 1 - characterize this limitation of the measurement of optical density; 2 - Suggest the X-ray \ufb02uorescence as a technique that bypasses the resulting di\ufb03culty caused by this limitation; and 3 - by X-ray micro\ufb02uorescense, reconstruct images and show what kind of information is lost and that the new method can be revealed. The study shows that the transmittance of light is a limited way to measuring the concentration of silver, and gave birth to a mathematical characterization of this limitation, which set a reasonable \ufb01t to experimental data. Also characterized and suggested the X-ray \ufb02uorescence method which can solve this problem, showing data that are more consistent with models that do not consider the limitation. The mapping was successful in reconstructing images and present a visual way that a good portion of the dynamic range is lost with the measurement by light transmittance.","keywords":"Optical density. X-ray micro\ufb02uorescence. Radiographic image.","status":"active","sarx_st":"accepted","user_id":61,"created_at":"2016-07-11 14:49:04","updated_at":"2016-08-20 12:17:46","filename":"elicardo.pdf","mode":"oral","sarx_code":"06_O-XRF","poster_group":null,"file":"1be53574b02946ad6fb3f6ab33269a4d.pdf","author":"Elicardo Alves de Souza Gon\u00e7alves","affiliation":"Doutor \/<\/b> Instituto Federal do Rio de Janeiro \/<\/b> Brasil","user":{"id":61,"name":"Elicardo Alves de Souza Gon\u00e7alves","degree":"Doutor","email":"elicardo.goncalves@ifrj.edu.br","username":"elicardo.goncalves@ifrj.edu.br","confirmed":0,"confirmation_code":"3lSBb7oAYkVEcJo8zTvqROKG5f1gju","created_at":"2016-04-06 13:03:02","updated_at":"2018-02-23 01:24:19","sarx":1,"affiliation":"Instituto Federal do Rio de Janeiro","address":"R. Sebasti\u00e3o de Lacerda s\/n, Centro","zipcode":"26600-000","state":"Rio de Janeiro","phone":"21995071227","fax":null,"city":"Paracambi","country":"Brasil","status":"active","is_admin":0,"category":"professor","school":0,"icdd":0}}}