ABSTRACT
Antero-posterior radiographs of the larynx lack spatial and temporal resolution, due to the movement of the vocal folds during phonation. By utilising the electrolaryngograph to monitor vocal fold movement, single X-ray pulses of 30 nanoseconds duration have been triggered at pre-determined points during the cycle of vocal fold movement to visualise these in normal phonation.
Subject(s)
Movement , Vocal Cords/diagnostic imaging , Female , Humans , Male , Phonation , Radiography , Technology, Radiologic , Time Factors , Vocal Cords/physiologyABSTRACT
Adequate assessment of disease extent is vital for tumour control in the larynx. Xeroradiography using a tomographic technique was investigated. A preliminary study was carried out to assess the optimum technique and exposure. It was also found that the radiation dose to the skin, although just over twice that for film, could be halved by the removal of the secondary radiation grid. Images of 24 patients treated were assessed for soft tissue and bony detail, and it was found that the xerotomograms were beneficial to the radiotherapy planning of the treatment volume of laryngeal and related neck carcinomas.
