| Japanese |
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| Title | 左室駆出率測定用シングルプローブ装置の試作に関する研究 |
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| Subtitle | 短報 |
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| Authors | 鈴木豊*, 中村正彦**, 友田春夫***, 森瑞樹**** |
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| Organization | *東海大学医学部放射線科, **ME学教室, ***循環器内科, ****アロカ株式会社 |
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| Journal | 核医学 |
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| Volume | 20 |
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| Number | 8 |
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| Page | 1183-1187 |
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| Year/Month | 1983/9 |
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| Article | 報告 |
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| Publisher | 日本核医学会 |
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| Abstract | 「I. はじめに」ファーストパス法による単一の左室時間放射能曲線 (LVTAC) よりバックグラウンド曲線 (BKG) を推定する方法についてはすでに報告した. 今回, この処理法を実際に応用する試みとして, マイクロコンピュータを内蔵したシングルプローブ装置を試作したのでその結果について報告する. 「II. 方法」「1. ハードウエア」この装置は, シンチレーションプローブ (直径50.8mm, 高さ25.4mm) , 中央演算処理装置 (LSI-11/23, 128Kバイト) , フロッピーディスク装置, ディスプレイ装置, ハードコピー装置より構成されている. プローブは高計数率に正確に応答できるように設計されており, 99mTcを使用した場合, 5%の数え落しは, 波高分析器のウインドウ幅30%で150Kcps, 40KeV以上の積分計測で220Kcpsであった. コリメータは, 内径50.8mm, 長さ80.0mm, 壁の厚さ5.0mmの鉛製平行孔型を試作した. |
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| Practice | 臨床医学：一般 |
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| Keywords | Radionuclide Angiocardiography, Single Probe System, First Pass Study |
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| English |
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| Title | Microcomputer-Based Scintillation Probe System for Assessment of Left Ventricular Ejection Fraction |
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| Authors | Yutaka SUZUKI*, Masahiko NAKAMURA**, Haruo TOMODA***, Mizuki MORI**** |
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| Authors(kana) | |
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| Organization | *Department of Radiology, **Medical Engineering, ***Cardiology, Tokai University Medicial School, ****Aloka Co. Ltd. |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 20 |
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| Number | 8 |
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| Page | 1183-1187 |
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| Year/Month | 1983/9 |
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| Article | Report |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] A microcomputer-based single probe system has been developed to caclulate left ventricular ejection fraction (LVEF) from first pass left ventricular time-activity curve (LVTAC) . The system consists of a scintillation probe (50.8mm in diameter and 25.4mm in height) , a central processing unit (LSI-11/23 with 128 k-bytes) , a flooppy disc unit, a graphic display unit and a hard copy unit. A straight bore collimator of 50.8mm in inner diameter and 80.0mm in length is attached to the detector. The system has been designed to attain high countrate characteristics. Five percent count loss has occured at 150,000 cps with a 30% window of a pulse-height analyser. With injection of 2mCi of 99mTc pertechnetate, the maximum count of LVTAC was around 70,000 cps. This system has a program for determination of LVEF from a first pass LVTAC based on quantitative correction for background curve (BKG) . LVTAC is mathematically described by the following equation. A(t)=KC(t)(VEs+VsTV(t))+B(t) where A(t) is the observed curve, K is a constant, C(t) is the tracer concentration time-function in the left ventricle (LV) , VEs denotes the end-systolic volume of the LV, VsT denotes the stroke volume of the LV, V(t) is the volume variation curve of the LV is normalized so as to be zero at end-systole and unity at end-diastole, and B(t) is the BKG. |
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| Practice | Clinical medicine |
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| Keywords | Radionuclide Angiocardiography, Single Probe System, First Pass Study |
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