Measurement of spermatozoal motility over prolonged periods of time using image analysis

This paper presents a new method for the quantitative analysis of the movement characteristics of spermatozoa. The method is based on (i) measuring the displacement of a spermatozoon observed using a microscope and (ii) automatically compensating for the displacement of the spermatozoon in order to keep it in the center of the microscopic field. The displacement of the spermatozoon is measured by on-line processing of digitized images of the microscopic field, acquired by an image analysis system. The motility characteristics of the same spermatozoon can be evaluated over prolonged periods of time (typically 10 min). The movement characteristics of 19 spermatozoa from five fertile donors were studied. At constant temperature, intradonor variations of the motility parameters were found. No statistically significant differences were found in the mean values of the motility characteristics for three of four donors. At increasing temperature, the mean curvilinear velocity, averaged on the 19 spermatozoa from the five donors, regularly increased between 23 and 30 degrees C and remained constant up to 38 degrees C.