AI tool claims to find sperm in infertile men in seconds

SpermSearch, a new artificial intelligence (AI) tool, claims to identify sperm in severely infertile men in seconds compared to the hours it takes scientists.

The authors of the study, led by Dale Goss from the University of Technology Sydney, presented the results at the 39th annual meeting of the European Society of Human Reproduction and Embryology (ESHRE)¹.

The new algorithm brings hope to men who want a biological child but have no sperm in their semen, according to the study authors. The tool instantly identifies sperm, then leaves the embryologist to decide whether sperm is really present and if it is viable enough for Intracytoplasmic Sperm Injection (ICSI), according to the authors. Results claim the algorithm is also more accurate than an experienced clinician.

Sperm identification

Lead author Dale Goss said, “This tool has the ability to give patients who have very little chance of fathering their own biological children an increased chance.

“The algorithm improves antiquated approaches that have not been updated in decades. It will ensure the rapid identification of sperm in samples, which will not only increase the chance of a couple conceiving their own biological children, but also reduce stress on sperm and increase efficiency in the laboratory.”

Around 1% of all men have no sperm in their semen, which is the most severe form of infertility — known as non-obstructive azoospermia (NOA). The condition affects around 5% of couples seeking fertility treatment.

To identify sperm for ICSI, embryologists partially shred tissue samples and tease them apart with forceps or fine needles. Any sperm present is then released into a specially prepared liquid which is placed in a petri dish.

With a microscope, the clinician searches through droplets of this liquid, a tiny portion at a time. However, contamination from other cells and particles makes this challenging. If the embryologist misses the sperm, the patient has less opportunity to become a parent, and the longer this takes, the greater the chance the sperm is not viable.

Could AI speed up the process?

The aim of the study was to test if AI could speed up this process. The research was carried out at an IVF clinic in Sydney in two phases over five months using AI software installed on a computer. The researchers first trained the algorithm by showing it thousands of still microscope photographs. These images featured sperm and high levels of other cells and debris, but only the sperm was highlighted.

This coaching enabled the AI tool to eventually learn through image analysis what a sperm looked like using its own evaluation system that checks and adjusts its performance.

Goss and his team used healthy sperm, and then samples of testicular tissue from seven patients aged from 36 to 55 years. All had been diagnosed with NOA and had already undergone surgical sperm retrieval at the clinic.

The men donated tissue left over after treatment that had been prepared for sperm retrieval but not needed.

Algorithms vs embryologists

A test was then carried out simultaneously between the algorithm and an embryologist whose precision was considered to be 100%. The researchers compared the time both took to identify sperm and their degree of accuracy.

Results showed that the AI found more sperm overall, although some were only spotted by the embryologist and some by AI alone. The embryologist found 560 sperm, the AI found 611, and between them they found a total of 688. The algorithm identified sperm for each area of droplet that it viewed in less than a 1000th of the time taken by an embryologist.

It was also more accurate and precise in identifying sperm — the AI tool found 60 more sperm, and it was 5% more accurate than the embryologist per viewable droplet area.

In their conference presentation, the authors highlight that the study is based on a proof-of-concept test and that a clinical trial is required. This is to prove the technique is useful and performs the task of sperm detection with the desired result.

They add that such research should be carried out among men with other forms of severe infertility and who are undergoing other surgical approaches, such as sperm collections from different parts of the testes.

The Chair of ESHRE, Professor Carlos Calhaz-Jorge from the Northern Lisbon Hospital Centre and the Hospital de Santa Maria in Lisbon (Portugal), was not involved in this research. He said, “For men diagnosed with non-obstructive azoospermia, ICSI with sperm retrieved from the testicles is the only realistic chance of having biological children. This is a preliminary study on the use of AI for finding healthy sperm in men experiencing this type of infertility.

“Finding healthy sperm under the microscope in fragments of testicular biopsies can be an arduous process. The prospect of using AI to make the process quicker and more accurate is very interesting. We need to see more research to build on these results.”

^{1. Presentation no: O-136, “Artificial intelligence to assist in surgical sperm detection and isolation”, presented by Dale Goss, Session 44: Focal or not Focal Spermatogenesis: That is the question!, Hall D4, 10.15 hrs CEST, Tuesday 27 June 2023.}

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