抄録
Sagittal pictures of the larynx, taken by means of a therapeutic roentgen apparatus in 40 patients with laryngeal cancer, were compared with the indirect laryngoscopical pictures of the same area in the same cases and with the findings prepared from 36 larynges totally removed.
The following technique used was one described in Dr. Kanda's work.
Bulk-focus distance: 90-100cm or so
Intensity of current: 3 milli amperes
Voltage: 140 kilovolts
Exposure: 0.7-1 second
Position of subject: Flat on face, with neck fully extended and vocal organs kept issuing the sound “Uh”
The following was the result of the radiographical examination.
1. Any laryngeal cancer sufficiently developed to be diagnosed pathohistologically and with the direct laryngoscope was identifiable radiographically.
2. Radiography was found valuable as used in the diagnosis for the cancerous lesion produced not only in the two lateral walls of the hypopharynx, the larynx, the subglottic area and the trachea, and in the inner wall of the pyriform sinus, but also in the anterior and posterior walls of the larynx and trachea.
3. Radiography proved of greater use than indirect laryngoscopy in that it made visible the changes produced in the subglottic area, the cordar paralysis, and those various ohter laryngeal disturbances which neither direct nor indirect laryngoscopy could disclose.
4. Radiography was found
(1) to serve the purpose of confirming and amplifying the findings reached by direct and indirect laryngoscopy;
(2) to give an everlastingly visible pictures of laryngeal lesions;
(3) to denote how far the tumor is extended into the subglottic area.
5. Radiography proved adapted for wide everyday application, needing no complicated technique and no special apparatus difficult to handle.
6. It is to be noted, however, that radiography as it is today needs to be improved, because the pharyngeal picture it gives is somtimes obscured by the presence of the vertebrae (particularly by the process caudalis) and calcified laryngeal cartilages and by the thickness of the cervical soft tissue.
