Japanese
Titleマルチゲート心プールECTにおける新しい位相解析法の試み
Subtitle短報
Authors伊藤綱朗*, 前田寿登*, 竹田寛*, 中川毅*, 山口信夫*, 市川毅彦**, 小西得司**
Authors(kana)
Organization*三重大学医学部放射線科, **第一内科
Journal核医学
Volume23
Number2
Page161-165
Year/Month1986/2
Article報告
Publisher日本核医学会
Abstract「I. 緒言」ガンマカメラ回転型ECTの心臓イメージングへの応用として, 近年では, 201Tlによる心筋シンチばかりでなく, マルチゲート心プールシンチへの臨床応用も多くなってきている. このマルチゲート心プールECT(GPECT:gated pool ECT)は, 拡張末期像と収縮末期像との対比や, 動画表示による左室壁運動の評価, 左室逆流性弁膜疾患の逆流率の測定, などに用いられているが, 最近では, Adamらによって提唱された, 位相解析法(phase analysis)も試みられている. しかし, これまで報告されているGPECTの位相解析法は, 一断層像の時間放射能曲線に対して位相解析を応用したものであり, 従来からの位相解析法で用いられているような時間容量曲線とは考え方が異なる. このため, 著者らは, 各時相における体軸横断像より, 左室軸方向からみた左室のみのgated planar imageを再構築し, この時間容量曲線に対して位相解析する方法を考案したので, その方法と有用性について報告する.
Practice臨床医学：一般
KeywordsGated blood pool ECT, Phase analysis, Functional image, Ischemic heart disease, Regional wall motion.
English
TitleA New Method for Phase Analysis in Gated Blood Pool Emission Computed Tomography (GPECT)
SubtitleShort Communications
AuthorsTsunao ITO*, Hisato MAEDA*, Kan TAKEDA*, Tsuyoshi NAKAGAWA*, Nobuo YAMAGUCHI*, Takehiko ICHIKAWA**, Tokuji KONISHI**
Authors(kana)
Organization*Department of Radiology, **First Department of Internal Medicine, Mie University School of Medicine
JournalThe Japanese Journal of nuclear medicine
Volume23
Number2
Page161-165
Year/Month1986/2
ArticleReport
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
AbstractA new method for phase analysis in gated blood pool emission computed tomography (GPECT) has been developed and applied to the estimation of regional left ventricular wall motion abnormalities (LVWMAs) in patients with ischemic heart disease. Equilibrium gated blood pool data were acquired using an ECT system with dual opposed gamma cameras. The data were acquired from 60 angular projections over 360 degrees in a R-wave synchronized frame mode, dividing each cardiac cycle into 14 frames. Acquired GPECT data were processed as follows. 1) Transaxial tomographic images at each frame of cardiac cycle were reconstructed with convolution algorithm. 2) Data for ROIs covering LV images were extracted from the transaxial tomographic images at each frame of cardiac cycle. 3) The images covering LV were rotated to reorganize oblique-angle tomograms oriented either parallel or perpendicular to the long axis of LV, that is, sagittal, horizontal and short-axial tomograms. 4) Tomographic images in the sagittal, horizontal and short-axial planes at the same frame of cardiac cycle were added up to generate their planar images. 5) Phase analysis based on the fundamental frequency was performed to construct phase and amplitude functional images. Conventional gated blood pool scans in the modified left anterior oblique projection were also performed, and phase analysis was carried out for comparison. Functional images from the GPECT method allowed the detailed assessment of regional LVWMAs, compared with the conventional method. This method was especially useful in evaluating postero-inferior WMAs, which were very difficult to be detected in the conventional method. In conclusion, phase analysis of GPECT has advantages in eliminating overlap of adjacent blood pools and in a detailed estimation of regional LVWMA on a three-dimensional basis, compared with the conventional method.
PracticeClinical medicine
KeywordsGated blood pool ECT, Phase analysis, Functional image, Ischemic heart disease, Regional wall motion.

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