腎囊胞のCT 画像に生じるpseudoenhancement effect の抑制に関わる撮影条件の検討：連続X 線と仮想単色X 線，画像再構成法，およびビーム幅の違いにおけるファントム検証

DOI Web Site Web Site PubMed 参考文献22件

書誌事項

タイトル別名
  • Evaluation of the CT Parameters to Suppress Renal Cysts Pseudoenhancement Effect: Influence of the Virtual Monochromatic Spectral Images, the Model-based Iterative Reconstruction Algorithm and the Aperture Size in Phantom Model
  • ジンノウホウ ノ CT ガゾウ ニ ショウジル pseudoenhancement effect ノ ヨクセイ ニ カカワル サツエイ ジョウケン ノ ケントウ : レンゾク Xセン ト カソウ タンショク Xセン,ガゾウ サイコウセイホウ,オヨビ ビームハバ ノ チガイ ニ オケル ファントム ケンショウ

この論文をさがす

抄録

<p>Purpose: The purpose of this study was to evaluate the effect of the virtual monochromatic spectral images (VMSI) and the model-based iterative reconstruction (MBIR) images, to evaluate the influence of the aperture size (40- and 20-mm beam) on renal pseudoenhancement (PE) compared with the filtered back projection (FBP) images. Methods: The renal compartment-CT phantom was filled with iodinated contrast material diluted to the attenuation of 180 Hounsfield units (HU) at 120 kV. The water-filled spherical structures, which simulate cyst, were inserted into the renal compartment. Those diameters were 7, 15 and 25 mm. These were scanned by conventional mode (helical scan, 120 kV-FBP) and dual energy mode. 70 keV-VMSI were reconstructed from the dual energy mode, and MBIR images were reconstructed from conventional mode at 40- and 20-mm aperture. Additionally, the phantom was scanned using non-helical mode with 20-mm aperture, and FBP images were reconstructed. The CT value of the PE for cyst areas was measured for these images. Results: The CT values of the cysts were 20.0–14.3 HU on the FBP images, 12.8–12.7 HU on the 70 keV-VMSI (PE-inhibition ratio was 36.0–11.2%) and 16.2–14.0 HU on the MBIR images (19.0–2.1%), respectively, at 40-mm aperture. The PE-inhibition ratio scanned by 20-mm aperture was improved by 28.0% with FBP, 32.8% with 70 keV-VMSI and 29.6% with MBIR compared with 40-mm aperture. One of the FBP images with non-helical mode was 11.6 HU. Conclusions: The best CT technique to minimize PE was the combination of 70 keV-VMSI and 20-mm aperture.</p>

収録刊行物

参考文献 (22)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ