Abstract

References
1.
1.
Tessler FN
,
Schiller VL
,
Perrella RR
, et al. Transvaginal versus endovaginal pelvic sonography: prospective study . Radiology
1989 ;170 :553 -556 .
2.
2.
Callen PW
. Ultrasonography in Obstetrics and Gynecology . Third edition . Philadelphia : WB Saunders , 1994 ;52 -56 .
3.
3.
Sanders RC
: Clinical Sonography a Practical Guide . Second edition . Boston : Little Brown and Company , 1991 ;50 -52 .
4.
4.
Burlew MM
,
Madsen EL
,
Zagzebski JA
, et al. A new ultrasound tissue-equivalent material . Radiology
1980 ; 134 :517 -520 .
5.
5.
Silver B
,
Metzger TS
,
Matalon TAS
. A simple phantom for learning needle placement for sonographically guided biopsy . AJR Am J Roentgenol
1990 ; 154 :847 -848 .
6.
6.
Zagzebski JA
,
Madsen EL
,
Frank GR
. A teaching phantom for sonographers . JCU J Clin Ultrasound
1991 ; 19 :27 -38 .
