Japanese
TitleポジトロンCTにおける数え落としの補正 - 単一光子計数率を用いる方法 -
Subtitle原著
Authors千田道雄*, 米倉義晴*, 向井孝夫*, 藤田透*, 鳥塚莞爾*
Authors(kana)
Organization*京都大学医学部核医学科
Journal核医学
Volume24
Number6
Page837-841
Year/Month1987/6
Article原著
Publisher日本核医学会
Abstract「要旨」本施設のポジトロンCT(PET)-Positologica III-を用いて種々のファントムの計数率と数え落としの関係を検討した. 真の同時計数率と数え落としの関係は線源や吸収体の分布によって大きく変わり, 単に真の同時計数率を用いての補正は不正確であった. 本PET装置の数え落としは, 主として単一光子検出信号が信号処理回路に入る段階でdead timeが発生することによるので, 単一光子計数率を測定して数え落とし補正する方法を開発した. 本法によれば線源や吸収体の分布によらない補正が可能であった.
Practice臨床医学：一般
KeywordsPositron emission tomography, Count loss, Dead time correction, Single photon rate.
English
TitleDead Time Correction in Positron Emission Tomograph - A Method Using Single Photon Rate -
SubtitleOriginal Articles
AuthorsMichio SENDA, Yoshiharu YONEKURA, Takao MUKAI, Toru FUJITA, Kanji TORIZUKA
Authors(kana)
OrganizationDepartment of Nuclear Medicine, Kyoto University School of Medicine
JournalThe Japanese Journal of nuclear medicine
Volume24
Number6
Page837-841
Year/Month1987/6
ArticleOriginal article
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Summary]The count rate linearity and dead time count losses were evaluated in Positologica III, a whole-body multislice positron emission tomograph, using several kinds of phantoms. A wide variation was observed in the relationship between count loss and true coincidence count rate depending on the source distribution, and the dead time correction using the count rate itself was unsuccessful. Since most count losses of this PET scanner occur when the single photon signals were encoded at the circuitry, we measured the single rate to correct for the count loss. This method enabled dead time correction independent of the distribution of source and attenuation material.
PracticeClinical medicine
KeywordsPositron emission tomography, Count loss, Dead time correction, Single photon rate.

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