Ｂａｌａｎｃｅｄ Ｔｕｒｂｏ Ｆｉｅｌｄ Ｅｃｈｏを用いた骨盤腔静脈叢描出のための至適撮像条件の検討

Abstract

Evaluating the relation between the developing range and the extent of invasion of a malignant tumor around the pelvic venous plexus is an important index for making strategic therapeutic decisions. In this study, we tried to depict a venous plexus in the pelvis using Balanced Turbo Field Echo (B-TFE). At first, we used an original phantom (derived from one layer of lard and another of agar (0.1%Gd-DTPA, 0.9%NaCl), each 500 ml, and we changed the Start Up Echo (SUE); 0-30, SPAIR inversion delay time (delay time); 0-200 ms, shot interval (SI); 1150, 1500 ms and evaluated the degree of fat suppression in SNR, CNR (the air signal method). The fat suppression-effect was found to be high in delay time; 120 ms in SUE; 0, SI; 1150 ms and 160 ms in SUE; 0, SI; 1500 ms was different SUE>0 each delay time. As for the images of healthy volunteers (5 men and 5 women), after fixing optimum conditions, we evaluated the images visually, as assessed by two radiologists and two radiographers, comparing between SUE; 0-30 and SI; 1150 and 1500 ms. According to the visual evaluation, the fat suppression-effect was worse, more than with the delay time; 20. We judged the best image of the venous plexus in the pelvis as being at SUE; 10, SI; 1500 ms. We think that using the B-TFE can help distinguish pelvic venous plexuses, by setting an optimum sequence.