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Rachael L. McEwing, Dolores H. Pretorius, Hector E. James and Sean Daneshmand

level assessment, ability to rotate volume data acquired using a transvaginal probe, and shortened duration of imaging time because of the ability to store the examination data and reconstruct the images later. Johnson, et al., 10 reported that lesion level could be determined more accurately with 3D ultrasonography in three of five cases of neural tube defects. The technical limitations of the 3D technique were emphasized, particularly artifact caused by fetal movement, and limited imaging results when the fetus is pressed against the uterine wall or placenta, or

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Rachael L. McEwing, Dolores H. Pretorius, Hector E. James and Sean Daneshmand

level assessment, ability to rotate volume data acquired using a transvaginal probe, and shortened duration of imaging time because of the ability to store the examination data and reconstruct the images later. Johnson, et al., 10 reported that lesion level could be determined more accurately with 3D ultrasonography in three of five cases of neural tube defects. The technical limitations of the 3D technique were emphasized, particularly artifact caused by fetal movement, and limited imaging results when the fetus is pressed against the uterine wall or placenta, or

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Hidetoshi Nojiri, Kei Miyagawa, Hiroto Yamaguchi, Masato Koike, Yoshiyuki Iwase, Takatoshi Okuda and Kazuo Kaneko

determine whether the position and displacement of organs on the approach path could be observed in real time, and we examined the possibility of using this technique to improve safety by preventing complications. Methods The study cohort comprised 100 patients who underwent lateral lumbar spine surgery at our institution, 92 via a left-sided approach. During surgery for lumbar interbody fusion or vertebral body replacement, a HI VISION Avius ultrasound device (Hitachi) and gas-sterilized EUP-V53W transvaginal probe (Hitachi) were used. An echo monitor was positioned at