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  3. Medical: Instruments

light-bulb effect

00:07 Jan 14, 2021
This question was closed without grading. Reason: No acceptable answer

English to Portuguese translations [PRO]
Medical - Medical: Instruments
English term or phrase: light-bulb effect
O termo faz parte de um glossário de termos médicos. Preciso do termo técnico (no MT, please).

light-bulb effect.–a type of computed radiographic artifact. The lower, outer portions of an image appear darkened relative to the remainder of the image because of backscattered radiation entering the photostimulable phosphor imaging plate from the patient’s bed or other object.
Oliver Simões
United States
Local time: 13:57


Summary of answers provided
3efeito penumbra
MARCOS BAZILIO


Discussion entries: 3





  

Answers


14 hrs   confidence: Answerer confidence 3/5Answerer confidence 3/5
efeito penumbra


Explanation:
Como o ponto focal não é exatamente um ponto, tendo dimensões mensuráveis, há um borramento indesejado nas bordas das estruturas, formando uma região de penumbra.

https://siteantigo.portaleducacao.com.br/conteudo/artigos/me...

http://dicasderadiologia.com.br/?p=261


    https://siteantigo.portaleducacao.com.br/conteudo/artigos/medicina/qualidade-da-imagem-radiografica-fatores-geometricos/35833
    Reference: http://dicasderadiologia.com.br/?p=261
MARCOS BAZILIO
Brazil
Local time: 17:57
Does not meet criteria
Works in field
Native speaker of: Portuguese
PRO pts in category: 4
Notes to answerer
Asker: Obrigado, Marcos. Um dos documentos fala em "borramento das bordas", e o outro em "halo de penumbra", dando a entender que o efeito se aplica à borda da imagem. O original, porém, fala das regiões "escurecidas", localizadas nas partes "inferior" e "externa" da imagem. Como podemos deduzir que estão falando do mesmo efeito? Se você encontrar mais uma referência que esclareça isso, por favor me avise.

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