1. Intraovarian blood flow measured with color doppler ultrasonography inversely correlates with vascular density in the human corpus luteum of the menstrual cycle 
Ulrika Ottander, M.D., Ph.D., Nils-Gunnar Solensten, M.D., Anders Bergh, M.D., Ph.D., Jan I Olofsson, M.D. Ph.D. 
Fertility and Sterility 
Volume 81, Issue 1, Pages (January 2004)
DOI: /j.fertnstert

2. FIGURE 1
(A) Typical color Doppler image of an early human CL and (B) histological section of factor VIII-related antigen immunostained blood vessels in the connective tissue (blue arrow) and in the steroidogenic layer (yellow arrow) of an early CL.
Ottander. Color Doppler and vascularization in human CL. Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )

3. FIGURE 2
(A) Principal ultrasonographic B-mode measurements and (B) principal anatomic measurements of the longest outer and inner dimensions and shortest outer and inner dimensions and the wall-thickness of a human corpus luteum.
Ottander. Color Doppler and vascularization in human CL. Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )

4. FIGURE 3
Changes in (A) pulsatility index (PI) during different periods of corpus luteum age (n = 8, early LP; n = 10, mid-LP; n = 8, late LP; E = significantly different vs. mid and late LP, P<.05) and (B) during different days of the luteal phase (n = 26, r = 0.25, P<.001; dotted lines indicate 95% confidence intervals). Changes in (C) blood vessel volume (%) during different periods of corpus luteum age (n = 8, early LP; n = 10, mid-LP; n = 8, late LP; E = significantly different vs. early and mid LP, P<.001) and (D) during different days of the luteal phase (n = 26, r = 0.4, P<.001; dotted lines indicate 95% confidence intervals).
Ottander. Color Doppler and vascularization in human CL. Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )