Advertisement

Three-dimensional sperm surface reconstruction: a novel approach to assessing sperm morphology

Published:September 09, 2015DOI:https://doi.org/10.1016/j.fertnstert.2015.08.024

      Objective

      To create a rapid, inexpensive, efficient, and reproducible real-time three-dimensional (3-D) analysis of viable spermatozoa. Previous studies have demonstrated that abnormal semen profiles are associated with a modest increase in the frequency of sperm chromosomal abnormalities, and that sperm with aberrations in the shape and contours of the head may be carriers of chromatinic defects. Although high-power magnification and enhanced video-generated magnification have been suggested, these techniques are inherently limited by the clarity of the image, the time required for the analysis, and the risk of variable head-positioning during imaging.

      Design

      In vitro experiment.

      Setting

      University-affiliated infertility research laboratory.

      Patient(s)

      Anonymous sperm donors.

      Intervention(s)

      Individual motile sperm were identified, analyzed at ×600 magnification, and a 10-second digital video was obtained.

      Main Outcome Measure(s)

      Image-tracking software captured serial photographs of sperm from recorded videos. Images were automatically extracted from each video frame using enhanced correlation coefficient maximization; the general shape of the sperm was extracted via space-carving. The reconstructed image was rotated to permit viewing from any direction, and the final image was rendered through interpolation.

      Result(s)

      This technique yielded images that enable noninvasive, 3-D, real-time, in vitro assessment of sperm surface morphology.

      Conclusion(s)

      This proof-of-principle demonstrates that by keeping spermatozoa in a fluid environment, a 3-D sperm–surface reconstruction can be created. This technique can be automated, requires minimal computing power, and utilizes equipment already available in most embryology laboratories.

      Key Words

      Discuss: You can discuss this article with its authors and with other ASRM members at http://fertstertforum.com/levineb-3d-sperm-surface-reconstruction/

      Available on youtube

      Supplementary data