Abstract
Foreknowledge of the morphological changes on the tympanic cavity and it's sorrounding tissues becomes very important particulars of the preoperative diagnosis on the tympanoplasty.
Particularly, preoperative affirmation of many changes on the ossicles, such as the lack of the ossicles, positional and formal abnormalities, calcification, and destructions of the ossicular chain, have many significances on determination of the operative method and prognosis
Therefore, many roentgenological studies have been performed by many peoples but those methods are still not available because the ossicles were not observed clearly from it's anatomical reasons.
Author reported the result of re-examination the Chausse's method, G. Guillen's method and axial method by using the DAITO-HIRANO's roentgen photographing apparatus.
