How may external and interstitial illumination be compared in laser photodynamic therapy?

Abstract

It is useful for clinicians to have some guidelines on dosage when they first treat a tumour using interstitial photoradiation therapy. A graph is given which may be used to determine the required fibre dose when the corresponding dose and treatment distance are known for external irradiation of the same type of tissue. Optical parameters for a given tumour are not usually known with great accuracy, but this is not a problem because the model is not particularly sensitive to variations of these values within the clinical range.