A method of analysing a target bodily tissue of a subject, the method comprising the steps of: a) receiving, in a data analysis unit, image data of the target bodily tissue and a background bodily tissue adjacent to the target bodily tissue, the image data being obtained over a time period after dosing the subject with a contrast agent; b) determining an intensity of light emitted from a first area of the target bodily tissue and an intensity of light emitted from a first area of the background bodily tissue at a plurality of time points during the time period, the intensity of light emitted from the target bodily tissue and the background bodily tissue at each of the plurality of time points being dependent upon the amount or brightness of contrast agent present in said tissues at each time point; c) comparing the intensity of light emitted from the first area of the target bodily tissue and the intensity of light emitted from the first area of the background bodily tissue over the plurality of time points; d) determining for a first part of the time period and a second part of the time period, the first part of the time period being earlier in the time period than the second part of the time period, wherein the first time period is an initial uptake phase of the contrast agent and wherein the second part of the time period is a washout phase of the contrast agent, whether: 1) the intensity of light emitted from the target bodily tissue is lower than the intensity of light emitted from the background bodily tissue during the first part of the time period; and 2) the intensity of light emitted from the target bodily tissue is higher than the intensity of light emitted from the background bodily tissue during the second part of the time period; wherein a negative determination in relation to 1) and/or 2) is indicative of the target bodily tissue being benign and a positive determination in relation to 1) and/or 2) is indicative of the target bodily tissue being malignant; and wherein step d) 2) involves determining whether the intensity of light emitted from the target bodily tissue and the intensity of light emitted from the background bodily tissue have a convergent or divergent relationship over the second part of the time period, wherein a convergent relationship is indicative of the target bodily tissue being benign and a divergent relationship is indicative of the target bodily tissue being malignant. a) receiving, in a data analysis unit, image data of the target bodily tissue and a background bodily tissue adjacent to the target bodily tissue, the image data being obtained over a time period after dosing the subject with a contrast agent; b) determining an intensity of light emitted from a first area of the target bodily tissue and an intensity of light emitted from a first area of the background bodily tissue at a plurality of time points during the time period, the intensity of light emitted from the target bodily tissue and the background bodily tissue at each of the plurality of time points being dependent upon the amount or brightness of contrast agent present in said tissues at each time point; c) comparing the intensity of light emitted from the first area of the target bodily tissue and the intensity of light emitted from the first area of the background bodily tissue over the plurality of time points; d) determining for a first part of the time period and a second part of the time period, the first part of the time period being earlier in the time period than the second part of the time period, wherein the first time period is an initial uptake phase of the contrast agent and wherein the second part of the time period is a washout phase of the contrast agent, whether: 1) the intensity of light emitted from the target bodily tissue is lower than the intensity of light emitted from the background bodily tissue during the first part of the time period; and 2) the intensity of light emitted from the target bodily tissue is higher than the intensity of light emitted from the background bodily tissue during the second part of the time period; 1) the intensity of light emitted from the target bodily tissue is lower than the intensity of light emitted from the background bodily tissue during the first part of the time period; and 2) the intensity of light emitted from the target bodily tissue is higher than the intensity of light emitted from the background bodily tissue during the second part of the time period; wherein a negative determination in relation to 1) and/or 2) is indicative of the target bodily tissue being benign and a positive determination in relation to 1) and/or 2) is indicative of the target bodily tissue being malignant; and wherein step d) 2) involves determining whether the intensity of light emitted from the target bodily tissue and the intensity of light emitted from the background bodily tissue have a convergent or divergent relationship over the second part of the time period, wherein a convergent relationship is indicative of the target bodily tissue being benign and a divergent relationship is indicative of the target bodily tissue being malignant.