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Journal
Transactions of the American Nuclear Society; ISSN 0003-018X; 
; v. 35 p. 429-432
; v. 35 p. 429-432
[en] The aim of this report is the objective evaluation of the clinical image quality through the implementation of a multiscale method of structural similarity (MS-SSIM*) and the assessment of noise. The method has been applied to analyze multislice computed tomography (MSCT) chest pediatric images obtained with different optimization methods. To cover the broad chest diametrical ranges for pediatric patients, two phantoms have been used a cylindrical polymetil methacrylate (PMMA) phantom of 16 cm diameter and an anthropomorphic phantom. Three different CT scans have been acquired for each phantom, with the same scout view. The first scan has been adquired with the standard protocol using intensity modulation with patient thickness, Z-DOM (reference image). Then, images from two different optimization procedures have been evaluated: first, intensity modulation with bismuth protectors and then reduced intensity relative to the reference exposure in the standard procedure. The results show lower noise and greater similarity to the reference image on the images acquired with intensity modulation and bismuth versus those acquired by reducing the intensity up to 25%. Multiscale similarity algorithm can provide relevant image quality information without subjectivity or dependence of viewing conditions.
[es]
El objetivo del presente estudio es la evaluación objetiva de la calidad de imagen clínica mediante la aplicación de un método multiescala de similitud estructural (MS-SSIM*) y la evaluación de ruido, en la imagen obtenida tras procesos de optimización en procedimientos pediátricos de tomografía computarizada multicorte (TCMC) de tórax. Con objeto de cubrir el amplio rango diametral del tórax pediátrico se han utilizado dos maniquíes, uno de polymetil metacrilato (PMMA) de 16 cm de diámetro y otro antropomórfico. Se han realizado tres adquisiciones TC diferentes, para cada maniquí, bajo el mismo topograma, la primera de ellas con el procedimiento estándar utilizando modulación en intensidad Z-DOM (imágenes de referencia). Las imágenes a evaluar corresponden a los procesos de optimización de dosis, a saber: modulación de intensidad con protectores de bismuto y reducción de intensidad respecto a la exposición de referencia en el procedimiento estándar. Los resultados obtenidos son un menor ruido y una similitud mayor con la imagen de referencia entre las imágenes adquiridas con modulación de intensidad y bismuto frente a las adquiridas por reducción de intensidad de hasta el 25 %. La aplicación del algoritmo de similitud multiescala entre imágenes de TCMC puede aportar información relevante sobre la calidad de imagen obtenida frente a la evaluación mediante métodos subjetivos o dependientes de las condiciones de visualización.Journal
[en] The objective of this study is the dosimetry evaluation in pediatric MSCT of thorax and abdomen, and the estimation of effective dose in the different ranges of age taking into account the new ICRP recommendations, by variations that may be involved in explorations that affect breast. (Author)
Source
910 p; ISBN 978-84-697-1831-5; ; 2013; p. 837; 3 Joint Congress Spanish Societies of Medical Physics and Radiation Protection; 3 Congreso Conjunto Sociedad Espanola Fisica Medica y Proteccion Radiologica; Caceres (Spain); 18-21 Jun 2013; Available on-line: www.sefmseprextremadura2013.es; 3 refs.
; 2013; p. 837; 3 Joint Congress Spanish Societies of Medical Physics and Radiation Protection; 3 Congreso Conjunto Sociedad Espanola Fisica Medica y Proteccion Radiologica; Caceres (Spain); 18-21 Jun 2013; Available on-line: www.sefmseprextremadura2013.es; 3 refs.
[en] The objective of this study is to evaluate the contribution of effects over beaming and over ranging dose received by the patient in a TC multislice with 64 detectors, installed at a children's hospital, for the different acquisition modes available, in order to assess the adequacy of the protocols pre-set for Pediatrics and more accurately assess the received dose. (Author)
Source
910 p; ISBN 978-84-697-1831-5; ; 2013; p. 750-751; 3 Joint Congress Spanish Societies of Medical Physics and Radiation Protection; 3 Congreso Conjunto Sociedad Espanola Fisica Medica y Proteccion Radiologica; Caceres (Spain); 18-21 Jun 2013; Available www.sefmseprextremadura2013.es; 3 refs.
; 2013; p. 750-751; 3 Joint Congress Spanish Societies of Medical Physics and Radiation Protection; 3 Congreso Conjunto Sociedad Espanola Fisica Medica y Proteccion Radiologica; Caceres (Spain); 18-21 Jun 2013; Available www.sefmseprextremadura2013.es; 3 refs.
[en] The objective of this study is to evaluate the implications of this new limit of equivalent dose in the lens can be assumed in the radiation protection of cardiologists, radiologists, nursing professionals, etc. that perform their work in units of intervention, both in terms of additional protective measures and the classification of them as workers exposed. (Author)
Source
910 p; ISBN 978-84-697-1831-5; ; 2013; p. 771-772; 3 Joint Congress Spanish Societies of Medical Physics and Radiation Protection; 3 Congreso Conjunto Sociedad Espanola Fisica Medica y Proteccion Radiologica; Caceres (Spain); 18-21 Jun 2013; Available www.sefmseprextremadura2013.es; 2 refs.
; 2013; p. 771-772; 3 Joint Congress Spanish Societies of Medical Physics and Radiation Protection; 3 Congreso Conjunto Sociedad Espanola Fisica Medica y Proteccion Radiologica; Caceres (Spain); 18-21 Jun 2013; Available www.sefmseprextremadura2013.es; 2 refs.
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