Impact of Iterative Reconstruction on Shape Reproducibility of Three-dimensional Computed Tomography

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  • Hoshino Takashi
    Department of Radiology, Ishinkai Yao General Hospital Graduate School of Medical Science, Kanazawa University
  • Ichikawa Katsuhiro
    Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Terakawa Syouichi
    Graduate School of Medical Science, Kanazawa University Department of Radiology, Osaka City General Hospital
  • Katsuma Yasuyuki
    Department of Radiology, Nara Medical University Hospital
  • Fujimura Ichirou
    Graduate School of Medical Science, Kanazawa University Department of Radiology, Osaka Pref, Senshu Critical Care Medical Center
  • Ueda Yuuji
    Department of Medical Technology, Imazato Heart Clinic
  • Miura Youhei
    Graduate School of Medical Science, Kanazawa University Department of Diagnostic Imaging, Osaka General Medical Center
  • Nishimura Kenji
    Department of Radiology, Ishinkai Yao General Hospital

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  • 逐次近似再構成法が三次元CT画像の形状再現性に与える影響
  • チクジ キンジ サイコウセイホウ ガ サンジゲン CT ガゾウ ノ ケイジョウ サイゲンセイ ニ アタエル エイキョウ

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Abstract

The purpose of this study was to evaluate the effect of an iterative reconstruction method (IR) on shape reproducibility in three-dimensional (3D) computed tomography images. We used an IR (sinogram-affirmed iterative reconstruction: SAFIRE) implemented in a 64-channel multi slice computed tomography system (Siemens, SOMATOM Definition AS). We scanned a simulated vessel phantom with 180-HU vessel contrast at various radiation doses and reconstructed axial images of filtered back projection (FBP) and SAFIRE. Then we reconstructed multi-planar reconstruction (MPR) and volume rendering (VR) images from the axial images. Roundness was evaluated from MPR images and vessel surface roughness was evaluated from pixel value profiles of a vessel in VR images and visual evaluation by radiological technologists. In comparison on equivalent dose, the roundness and roughness were improved with increase of SAFIRE strength level. However, in comparison on equivalent noise (standard deviation: SD) of axial images, SAFIRE strength levels of 2 to 5 were significantly inferior to FBP (p<0.05). SAFIRE strength of 1 with a dose reduction of 19% maintained the shape reproducibility in all evaluations. Therefore, it would be not appropriate to use the SD of axial image as index for the dose reduction rate determination of 3D-CT images.

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