SPEXS investigator Professor Robert Hadfield (University of Glasgow) has been awarded funding from the US National Institutes of Health (NIH) to apply infrared photon counting in dosimetry for laser cancer treatment. SPEXS advanced photon counting technologies to allow the signature of singlet oxygen (a single photon emitted at 1270 nm) to be registered, giving clinicians a direct measure of the treatment dose delivered to the patient during photodynamic therapy. The NIH RO1 Project entitled ‘Optimizing singlet oxygen dosimetry for photodynamic therapy (PDT) is led by Professor Timothy Zhu (University of Pennsylvania USA).