1. A dual modality imaging apparatus for investigating a sample located at a sample position, the apparatus comprising: a magnetic resonance imaging (=MRI) system having a magnet with a room temperature bore within which the sample position is located; and a fluorescence molecular tomography (=FMT) system having a mechanism for directing a light beam towards the sample position and a position-sensitive detector disposed within said bore for collecting fluorescence light from the sample, wherein at least part of the sample is imaged onto said position-sensitive detector, said mechanism for directing said light beam having a focusing device for focusing said light beam into a focal spot on the sample and a scanning device for scanning said focal spot on the sample.