11.RI心プールゲート法による左室機能測定技術 : LAO・LPOフーリェ像の局所壁運動異常検出および呼吸性移動補正法(論理積ゲート法)の有用性

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For assessment of left ventricular (LV) function, two methods are described. The one for detection of regional wall motion abnormality (RWMA), left anterior oblique (LAO) and left posterior oblique (LPO) view gated pool images (GPI) were acquired using red blood cells labeled in vivo with 30 mCi Tc-99m. Due to the necessity of a statistical high quality GPI in this study, a scintillation camera with high sensitivity parallel hole collimator masked by Pb plate of aperture 20 cmφ was used for acquiring data in high count rate and to avoid piling up of the scintillation pulse. In an area of only 17×17 cm, the LV image data was stored in 64×64 matrix of a computer system at 32 frames per cardiac cycle. Fourier analysis was applied to the GPI. The result was the ability of detecting the anterior WMA in LAO view was more useful than in LPO view but the posterior WMA in LPO view was more useful than in LAO view. In a case of a two vessel disease, LAO and LPO view demonstrated the anterior and posterior WMA clearly. In the other method, to obtain an image synchronized to both respiratory and ECG during exercise, a conjunctive gate method was developed. The obtained images were clear without any blur. To evaluate LV ejection fraction corrected for respiratory movement, using only respiratory synchronized images, region of interests (ROIs) were selected in LV image at every respiratory phase. Corrected LV time activity curve was derived from the ROIs. The result was the LVEF without correction was underestimated and the LV volume curve was distorted.
公益社団法人日本放射線技術学会の論文
1985-05-01

11.RI心プールゲート法による左室機能測定技術 : LAO・LPOフーリェ像の局所壁運動異常検出および呼吸性移動補正法(論理積ゲート法)の有用性

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