@article{oai:air.repo.nii.ac.jp:00004073,
 author = {Ono, Natsuki and Kumazawa , Yukiyo and Iwasawa , Takuya and Shirasawa , Hiromitsu and Sato , Wataru and Miura , Hiroshi and Sato , Naoki and Terada , Yukihiro},
 issue = {2},
 journal = {秋田医学, AKITA JOURNAL OF MEDICINE},
 month = {Nov},
 note = {Purpose : To identify embryo transfer position using two proposed new measurements in three-dimensional(3D)/four-dimensional(4D) ultrasonography, and examine its relationship to pregnancy rate.
Methods : We studied 105 cycles of in vitro fertilization and embryo transfer of good quality embryo performed between May and December 2016. Endometrial thickness and volume, distance from the embryo to the fundus (TDF), and as new measures, distance from the embryo to the center of both internal ostia of the fallopian tubes (transfer distance of the lateral position [TDL]), and distance from the embryo to the central endometrium area (transfer distance of the front/back position [TDFB]) were measured. The pregnant and non-pregnant groups were compared.
Results : The pregnancy rate was 23.8%. TDL values in the pregnant and non-pregnant groups were 26.9 ± 16.3 and 18.0 ± 16.0%, respectively, showing a significant difference (p=0.011). There was a significant positive correlation between endometrial thickness and volume.
Conclusions : The TDL was significantly longer in the pregnant group, implying the possibility that lateral deviation of the embryo transfer position does not affect the pregnancy rate. More accurate evaluation of embryo transfer site using 3D/4D ultrasound analysis may contribute to further improvement in pregnancy rates.},
 pages = {49--55},
 title = {A novel three-dimensional/four-dimensional ultrasound analysis of the effect of the transfer position in in vitro fertilization and embryo transfer on the pregnancy rate},
 volume = {46},
 year = {2019}
}