Laparoscopic Transducer Type 8555

Yeh HC Rabinowitz JG Amniotic sac development: Ultrasound features of early pregnancy-the double bleb sign. Radiology 1988:166:97–103.

Cacciatiore B Tinnen A Stenman UH Ylostalo P Normal early pregnancy: Serum hcg levels and vaginal ultrasonography findings British Journal of Obstetrics and Gynaecology 1990:97:889–903.

Cyr DR Mack LA Nyberg DA Fetal rhombencephalon: Normal ultrasound findings Radiology 1988:166:691–692.

Hertzberg BS Mahony BS Bowie JD First trimester fetal cardiac activity: Sonographic documentation of a progressive early rise in heart rate Journal of Ultrasound in Medicine 1988: 7:573–575.

Timor-Tritsch IE Warren WB Peisner DB Pirrone E First trimester midgut herniation: A high frequency transvaginal sonographic study American Journal of Obstetrics and Gynaecology 1989:161:831–838.

Bronshein M Kushnir O Ben-Rafael Z Transvaginal sonographic measurement of fetal kidneys in the first trimester of pregnancy Journal of Clinical Ultrasound 1990:18:299–301.