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Proceedings Paper

Potential benefit of the CT adaptive statistical iterative reconstruction method for pediatric cardiac diagnosis
Author(s): Frédéric A. Miéville; Paul Ayestaran; Christophe Argaud; Elena Rizzo; Phalla Ou; Francis Brunelle; François Gudinchet; François Bochud; Francis R. Verdun
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Paper Abstract

Adaptive Statistical Iterative Reconstruction (ASIR) is a new imaging reconstruction technique recently introduced by General Electric (GE). This technique, when combined with a conventional filtered back-projection (FBP) approach, is able to improve the image noise reduction. To quantify the benefits provided on the image quality and the dose reduction by the ASIR method with respect to the pure FBP one, the standard deviation (SD), the modulation transfer function (MTF), the noise power spectrum (NPS), the image uniformity and the noise homogeneity were examined. Measurements were performed on a control quality phantom when varying the CT dose index (CTDIvol) and the reconstruction kernels. A 64-MDCT was employed and raw data were reconstructed with different percentages of ASIR on a CT console dedicated for ASIR reconstruction. Three radiologists also assessed a cardiac pediatric exam reconstructed with different ASIR percentages using the visual grading analysis (VGA) method. For the standard, soft and bone reconstruction kernels, the SD is reduced when the ASIR percentage increases up to 100% with a higher benefit for low CTDIvol. MTF medium frequencies were slightly enhanced and modifications of the NPS shape curve were observed. However for the pediatric cardiac CT exam, VGA scores indicate an upper limit of the ASIR benefit. 40% of ASIR was observed as the best trade-off between noise reduction and clinical realism of organ images. Using phantom results, 40% of ASIR corresponded to an estimated dose reduction of 30% under pediatric cardiac protocol conditions. In spite of this discrepancy between phantom and clinical results, the ASIR method is as an important option when considering the reduction of radiation dose, especially for pediatric patients.

Paper Details

Date Published: 23 March 2010
PDF: 11 pages
Proc. SPIE 7622, Medical Imaging 2010: Physics of Medical Imaging, 76222D (23 March 2010); doi: 10.1117/12.843903
Show Author Affiliations
Frédéric A. Miéville, Ctr. Hospitalier Univ. Vaudois Lausanne (Switzerland)
Univ. of Lausanne (Switzerland)
Paul Ayestaran, GE Healthcare Europe (France)
Christophe Argaud, GE Healthcare Europe (France)
Elena Rizzo, Ctr. Hospitalier Univ. Vaudois Lausanne (Switzerland)
Univ. of Lausanne (Switzerland)
Phalla Ou, Hôpital Necker-Enfants Malades (France)
Francis Brunelle, Hôpital Necker-Enfants Malades (France)
François Gudinchet, Ctr. Hospitalier Univ. Vaudois Lausanne (Switzerland)
Univ. of Lausanne (Switzerland)
François Bochud, Ctr. Hospitalier Univ. Vaudois Lausanne (Switzerland)
Univ. of Lausanne (Switzerland)
Francis R. Verdun, Ctr. Hospitalier Univ. Vaudois Lausanne (Switzerland)
Univ. of Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 7622:
Medical Imaging 2010: Physics of Medical Imaging
Ehsan Samei; Norbert J. Pelc, Editor(s)

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