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Effect of radiation dose and adaptive statistical iterative reconstruction on image quality of pulmonary computed tomography.
Sato, Jiro; Akahane, Masaaki; Inano, Sachiko; Terasaki, Mariko; Akai, Hiroyuki; Katsura, Masaki; Matsuda, Izuru; Kunimatsu, Akira; Ohtomo, Kuni.
Afiliação
  • Sato J; Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan. jsato-tky@umin.ac.jp
Jpn J Radiol ; 30(2): 146-53, 2012 Feb.
Article em En | MEDLINE | ID: mdl-22180184
PURPOSE: The purpose of this study was to assess the effects of dose and adaptive statistical iterative reconstruction (ASIR) on image quality of pulmonary computed tomography (CT). MATERIALS AND METHODS: Inflated and fixed porcine lungs were scanned with a 64-slice CT system at 10, 20, 40 and 400 mAs. Using automatic exposure control, 40 mAs was chosen as standard dose. Scan data were reconstructed with filtered back projection (FBP) and ASIR. Image pairs were obtained by factorial combination of images at a selected level. Using a 21-point scale, three experienced radiologists independently rated differences in quality between adjacently displayed paired images for image noise, image sharpness and conspicuity of tiny nodules. A subjective quality score (SQS) for each image was computed based on Anderson's functional measurement theory. The standard deviation was recorded as a quantitative noise measurement. RESULTS: At all doses examined, SQSs improved with ASIR for all evaluation items. No significant differences were noted between the SQSs for 40%-ASIR images obtained at 20 mAs and those for FBP images at 40 mAs. CONCLUSION: Compared to the FBP algorithm, ASIR for lung CT can enable an approximately 50% dose reduction from the standard dose while preserving visualization of small structures.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Doses de Radiação / Processamento de Imagem Assistida por Computador / Tomografia Computadorizada por Raios X / Pulmão Idioma: En Ano de publicação: 2012 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Doses de Radiação / Processamento de Imagem Assistida por Computador / Tomografia Computadorizada por Raios X / Pulmão Idioma: En Ano de publicação: 2012 Tipo de documento: Article