Digital holographic microscopy in human sperm imaging

Area of Science:

• Biomedical Optics
• Reproductive Biology
• Microscopy Techniques

Background:

• Sperm analysis is crucial for male fertility assessment.
• Oligoasthenozoospermia (OAT) is a common cause of male infertility.
• Quantitative phase contrast imaging offers a label-free method to analyze biological samples.

Purpose of the Study:

• To employ digital holographic microscopy (DHM) for human sperm imaging.
• To compare quantitative phase contrast of sperm heads between normozoospermia (NZ) and oligoasthenozoospermia (OAT) groups.
• To assess the potential of DHM for differentiating sperm quality.

Main Methods:

• Digital holographic microscopy (DHM) was utilized for spermatozoa imaging.
• Quantitative phase shift evaluation was performed on sperm heads from five NZ and five OAT samples.
• Semen analysis preceded DHM processing, with maximum phase shift of sperm heads as the primary outcome measure.

Main Results:

• Median phase shifts in NZ samples ranged from 2.72-3.21 rad, while OAT samples showed 2.00-2.15 rad.
• Statistically significant differences (p < 0.001) were observed in phase shifts between individual NZ and OAT samples.
• Median phase shift was significantly higher in NZ (2.90 rad) compared to OAT (2.00 rad) samples (p < 0.001).

Conclusions:

• Quantitative phase shift analysis via DHM provides novel insights into sperm head structure and composition.
• The DHM technique shows promise for objective sperm evaluation.
• Current clinical utility of DHM for sperm analysis is not yet established.