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Evaluation of Low-Contrast Detectability of Iterative Reconstruction across Multiple Institutions, CT Scanner Manufacturers, and Radiation Exposure Levels.
Saiprasad, Ganesh; Filliben, James; Peskin, Adele; Siegel, Eliot; Chen, Joseph; Trimble, Christopher; Yang, Zhitong; Christianson, Olav; Samei, Ehsan; Krupinski, Elizabeth; Dima, Alden.
Afiliação
  • Saiprasad G; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Filliben J; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Peskin A; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Siegel E; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Chen J; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Trimble C; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Yang Z; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Christianson O; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Samei E; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Krupinski E; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
  • Dima A; From the Software and Systems Division, National Institute of Standards and Technology, 325 Broadway St, Boulder, CO 80305 (G.S., J.F., A.P., A.D.); Department of Diagnostic Radiology, University of Maryland Medical Center, Baltimore, Md (E. Siegel, J.C., C.T., Z.Y.); Departments of Medical Physics
Radiology ; 277(1): 124-33, 2015 Oct.
Article em En | MEDLINE | ID: mdl-25989480
ABSTRACT

PURPOSE:

To compare image resolution from iterative reconstruction with resolution from filtered back projection for low-contrast objects on phantom computed tomographic (CT) images across vendors and exposure levels. MATERIALS AND

METHODS:

Randomized repeat scans of an American College of Radiology CT accreditation phantom (module 2, low contrast) were performed for multiple radiation exposures, vendors, and vendor iterative reconstruction algorithms. Eleven volunteers were presented with 900 images by using a custom-designed graphical user interface to perform a task created specifically for this reader study. Results were analyzed by using statistical graphics and analysis of variance.

RESULTS:

Across three vendors (blinded as A, B, and C) and across three exposure levels, the mean correct classification rate was higher for iterative reconstruction than filtered back projection (P < .01) 87.4% iterative reconstruction and 81.3% filtered back projection at 20 mGy, 70.3% iterative reconstruction and 63.9% filtered back projection at 12 mGy, and 61.0% iterative reconstruction and 56.4% filtered back projection at 7.2 mGy. There was a significant difference in mean correct classification rate between vendor B and the other two vendors. Across all exposure levels, images obtained by using vendor B's scanner outperformed the other vendors, with a mean correct classification rate of 74.4%, while the mean correct classification rate for vendors A and C was 68.1% and 68.3%, respectively. Across all readers, the mean correct classification rate for iterative reconstruction (73.0%) was higher compared with the mean correct classification rate for filtered back projection (67.0%).

CONCLUSION:

The potential exists to reduce radiation dose without compromising low-contrast detectability by using iterative reconstruction instead of filtered back projection. There is substantial variability across vendor reconstruction algorithms.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Processamento de Imagem Assistida por Computador / Tomografia Computadorizada por Raios X / Tomógrafos Computadorizados / Exposição à Radiação / Imagens de Fantasmas Tipo de estudo: Clinical_trials / Evaluation_studies Idioma: En Ano de publicação: 2015 Tipo de documento: Article
Texto completo
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PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Processamento de Imagem Assistida por Computador / Tomografia Computadorizada por Raios X / Tomógrafos Computadorizados / Exposição à Radiação / Imagens de Fantasmas Tipo de estudo: Clinical_trials / Evaluation_studies Idioma: En Ano de publicação: 2015 Tipo de documento: Article