1990 年 83 巻 3 号 p. 471-486
Acoustic analysis of the voices of 195 patients with vocal polyps, unilateral recurrent laryngeal nerve paralysis, and laryngeal carcinoma were performed. Five acoustic parameters were derived: pitch perturbation quatient (PPQ), amplitude perturbation quatient (APQ), normalized noise energies a and b (NNEa, NNEb), and spectral slope (LD). Analyses were performed both before and after treatment. Size of the lesion and the dimensions of the glottal gap during phonation were determined from fiberstroboscopic video images before treatment. Results were as follows: (1) PPQ, APQ, NNEa, NNEb, and LD varied greatly within each disease group, and there was overlapping of parameter values among the disease groups. Therefore, the selected acoustic parameters did not prove to be useful in differential diagnosis. (2) Polyp size was significantly correlated to PPQ, APQ, NNEa, and NNEb. (3) Post-treatment changes were found in PPQ, APQ, NNEa and NNEb in cases of polyps; in APQ, NNEa, and NNEb in cases of carcinoma; and in NNEb in cases of paralysis.