Japanese
Title高性能ポジトロンエミッショントモグラフ : HEADTOME III
Subtitle原著
Authors菅野巖*, 三浦修一*, 村上松太郎*, 上村和夫*, 広瀬佳治**, 高橋重和**
Authors(kana)
Organization*秋田県立脳血管研究センター放射線科, **島津製作所医用機器事業部
Journal核医学
Volume21
Number8
Page921-932
Year/Month1984/8
Article原著
Publisher日本核医学会
Abstract「要旨」高分解能高定量性ポジトロンエミッショントモグラフHEADTOME IIIの設計とその基本的特性を報告する. 直径750mmのリング上に160個のBGO結晶(13.5×25.0×40.0)を配列し, 3リング並置した. シャドウマスクとセプタは独立に選択使用ができるようにした. 低分解能モードでは視野中心部半値幅8.2mm, 中心から9cm位置8.8mm, 高分解能モードではそれぞれ, 6.6mm, 7.1mmであった. 定量性に大きく関わるスライス厚は低定量性モードで視野中心部12.8mm, 中心から9cm位置13.9mm, 高定量性モードでそれぞれ, 9.1mm, 9.6mmであった. 感度は真の計数値で低分解能低定量性モード直接面スライス, 32kcps・(μCi/ml)-1, 交叉面スライス68kcps・(μCi/ml)-1であり, 高分解能, あるいは, 高定量性モードはそれぞれこれらの約半分であった. 本装置の長期的な定量性をWell型検出器との相互較正で調べた結果, 5スライス平均で1.9%であった.
Practice臨床医学：一般
KeywordsPositron Emission Tomograph, High Quantitation Imaging, High Resolution Imaging, BGO Detector, Scattered Coincidence.
English
TitleHigh Performance Positron Emission Tomograph : HEADTOME III
SubtitleOriginal Articles
AuthorsIwao KANNO*, Shuichi MIURA*, Kazuo UEMURA*, Matsutaro MURAKAMI*, Yoshiharu HIROSE**, Shigekazu TAKAHASHI**
Authors(kana)
Organization*Division of Nuclear Medicine and Radiology, Research Institute for Brain and Blood Vessels-Akita, **Shimadzu Corporation
JournalThe Japanese Journal of nuclear medicine
Volume21
Number8
Page921-932
Year/Month1984/8
ArticleOriginal article
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Summary]A high quantitation and high resolution positron emission tomograph (PET) has been developed and evaluated. HEADTOME III was basically designed as a three ring five plane brain PET. However, the larger aperture of patient tunnel enabled a whole body measurement. Each ring (75cm diam) consists of 160 BGOs (13.7×25.0×40mm) detectors, total being 480 BGOs for three ring. Shadow masks and septa designed to be used independently. The use of shadow masks narrow the resolution from low (LR) to high resolution (HR) mode. The use of septa reduce scatter coincidences from low (LQ) to high quantitation (HQ) mode. Planar resolutions at the center of the field of view (FOV) were 8.2 mm and 6.5 mm full width at half maximum (FWHM) in LR and HR, respectively. Deterioration of the resolution at 8 cm radius were 0.6 and 0.8 mm in FWHM. Slice thicknesses were 12.8 and 9.1 mm FWHM at the center of FOV with LQ and HQ, respectively, and its deviation over FOV were 1.1 and 0.8 mm with each. Difference between direct and cross planes in LQ mode was 0.1 mm. Sensitivities evaluated by true events for 68Ga 20 cm cylinder were 32 (68), 17 (33), 18 and 9 kcps/(μCi/ml) with the direct (cross) planes of LRLQ, direct (cross) planes of HRLQ, direct planes of LRHQ and HRHQ, respectively. Count rates were lineared up to 10 kcps true events per plane and recovered up to 80 kcps within 3% error by software correction using accidental coincidence events. Long term stability checked weekly by the factor of the cross calibration with the well detector was 2.2% COV as average of 5 planes and 2.6% at worst plane. This stability permits an accurate and precise physiological analysis of positron emitting tracers. In the last half year the system has been used as clinical PET and measured about 150 15O steady state studies and 30 18F-2-fluorodeoxy-D-glucose studies and gave good reproducibility.
PracticeClinical medicine
KeywordsPositron Emission Tomograph, High Quantitation Imaging, High Resolution Imaging, BGO Detector, Scattered Coincidence.

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