ICSI / IMSI
Intracytoplasmic morphologically selected sperm injection (IMSI) is a specialized variation of ICSI that uses a higher-powered microscope to select sperm. In conventional ICSI, the embryologist selects the most normal-looking motile sperm using a microscope that magnifies the sample up to 400 times. IMSI is a variation of ICSI that uses a high power light microscope (enhanced by digital imaging) to magnify the sperm sample over 6000 times. Sperm are then selected which have the most normally-shaped nuclei.