The Relation between Perceptual and Clinical Parameters of Voice Quality of Patients with Early Glottic Cancer before and after Radiotherapy and of Normal Speakers

From a theoretical point of view it seems trivial to state that there exists a relation between perception of voice aspects and physically measurable parameters: what you can hear, you should be able to measure and vice versa: what you do measure, you should be able to hear. In practice this assumption is not supported by research: judgements based on auditory perception can be related to acoustical voice parameters only in a difficult and incom­ plete way. Still, in diagnosis and therapy one starts from judgements based on auditory perception of voice. The aim of this study is to find a relationschip between perceptual, acoustical and clini­ cal parameters of voices of patients with early glottic cancer who are getting radiotherapy and of the voices of healthy speakers.