全身ＦＤＧ‐ＰＥＴ撮像における診断用造影ＣＴ画像を用いた減弱補正の妥当性

DOI Web Site 被引用文献1件 参考文献23件
  • 松本 圭一
    先端医療センター分子イメージング研究グループ（現　京都医療科学大学医療科学部放射線技術学科） 大阪大学大学院医学系研究科保健学専攻医用物理工学講座
  • 中本 裕士
    京都大学大学院医学研究科放射線医学講座
  • 坂本 攝
    姫路中央病院PET画像センター（現　神戸大学大学院医学系研究科放射線医学）
  • 村瀬 研也
    大阪大学大学院医学系研究科保健学専攻医用物理工学講座
  • 千田 道雄
    先端医療センター分子イメージング研究グループ（現　京都医療科学大学医療科学部放射線技術学科）

書誌事項

タイトル別名
  • Feasibility of Diagnostic Contrast-enhanced CT for Attenuation Correction of WholeBody PET Images
  • 全身FDG-PET撮像における診断用造影CT画像を用いた減弱補正の妥当性
  • ゼンシン FDG PET サツゾウ ニ オケル シンダンヨウ ゾウエイ CT ガゾウ オ モチイタ ゲンジャク ホセイ ノ ダトウセイ

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Objective: Image fusion has been recognized as a useful technique in diagnostic imaging. We have been evaluating the manual image fusion of PET and contrast-enhanced (CE) CT obtained separately. The CT images can be used for attenuation correction as well as for image fusion; however, the quantitative accuracy of CT-corrected PET images has yet to be assessed. The purpose of this study was to compare the radioactivity concentration between conventional 68Ge-corrected and CECT-corrected PET images. Methods: Twenty patients underwent a whole-body PET scan, followed by a CT scan with intravenous contrast material, after careful positioning using an individually molded vacuum cushion. Two different attenuation-corrected emission data sets were produced, i.e., 68Ge-corrected images and CECT-corrected images. Image registration was performed by maximizing mutual information-based cost function, between the CT and the combination of emission and transmission PET volumes. The CT pixel values in Hounsfield units were transformed into linear attenuation coefficients in cm−1, using a conversion formula for a lookup-table from phantom experiments. Measured activity concentrations from identical regions of interest in representative normal organs and in 25 pathologic foci of uptake were compared. In addition, the quality of the reconstructed images was assessed using the normal mean square error (NMSE). Results: Measured average radioactivity concentrations were 1.38-9.56% higher for CECT-corrected images than for 68Ge-corrected images. Overall, the NMSE value of CECT-corrected images compared with 68Ge-corrected images was 0.02±0.01. Conclusions: The difference in quantitative values between 68Ge-corrected and CECT-corrected PET images was comparable to that of an integrated PET/CT system. Diagnostic CT images with intravenous contrast performed separately before or after a PET scan could be used clinically not only for fusion but also for attenuation correction.

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