The invention relates to a property determination apparatus (1) for determining a property of an object (3). Optical sensing data being indicative of an optical property of the object and ultrasound sensing data being indicative of an ultrasound property of the object are generated, and a property determination unit (75) determines a property of the object based on at least one of the optical sensing data and the ultrasound sensing data. Since light and ultrasound have generally different penetration depths and scattering properties with respect to the object, a property of the object can be determined with good quality, even if the quality of one of the optical sensing data and the ultrasound sensing data is reduced by, for example, a relatively small penetration depth, or if one of the optical sensing data and the ultrasound sensing data is less suitable for determining a desired property of the object.