1. True ovarian volume is underestimated by two-dimensional transvaginal ultrasound measurement 
Mikkel Rosendahl, M.D., Erik Ernst, Ph.D., Per Emil Rasmussen, M.D., Claus Yding Andersen, D.M.S.C. 
Fertility and Sterility 
Volume 93, Issue 3, Pages (February 2010)
DOI: /j.fertnstert
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
Measurement of ovarian volume by 2D transvaginal ultrasound. (A) The three diameters obtained by 2D transvaginal ultrasound of the ovaries. Shaded area shows the orientation of the two planes. (B) Diameters d1 (ROL on picture) and d3 (ROH on picture). (C) The probe is rotated 90° to obtain diameter d2 (ROW on picture). EIV = external iliac vein.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

3. Figure 2
(A) Difference between ultrasound and weight. (B) Bland-Altman plot of differences between measurements vs. average. Observations would be scattered around y = 0 if no difference was detected.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions