At the 2004 Summer Olympics in Athens, Imbriani qualified for the German squad in the women's half-lightweight class (52 kg), by placing third from the World Championships in Osaka, Japan. Imbriani got off to a firm start with convincing victories over U.S. judoka Charlee Minkin and the host nation Greece's Maria Tselaridou in the prelims, before she succumbed to a waza-ari awasete ippon hold from China's Xian Dongmei with only forty-five seconds in the time limit during their quarterfinal match. Imbriani gave herself a chance for an Olympic bronze medal in the repechage round, but fell short to Algeria's Salima Souakri, who threw her off the tatami with a solid grip and a waza-ari hold forty seconds before their match ended.