血液信号を抑制した息止め心臓T_2強調画像における最適設定繰り返し時間の検討

概要

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Purpose: It has recently become possible to obtain T_2-weighted images using turbo spin echo with a preparation pulse to inhibit the signal from flowing blood(dark blood turbo spin echo: DB-TSE)during breath holding. In order to obtain higher-quality T_2-weighted images of the heart, we assessed the optimum preset repetition time(TR-preset), the interval between the dark blood preparation pulse and the end of data acquisition on DB-TSE. Materials and methods: DB-TSE left ventricular short-axis images were obtained with varying TR presets in eight volunteers. Signal intensity was measured for the myocardium and blood in the left ventricular cavity, and the signal intensity ratio of myocardium to blood was calculated. The optimum TR preset was determined so as to give the highest signal intensity ratio of myocardium to blood. A comparison was made of the myocardium-to-blood ratios between the eight volunteers and nine patients. Results: The optimum TR preset changed according to the cardiac cycle. By using the optimum TR preset, we obtained the peak signal intensity ratios in the volunteers and the patients. Conclusion: By using DB-TSE with the optimum TR preset for the cardiac cycle, we can obtain better quality T_2-weighted images of the heart.
社団法人日本放射線技術学会の論文
1999-03-20