Title: The method for measuring surface area of the mastoid
Abstract: Objective:To explore a method for measuring the area of the mastoid and to measure the area of air cell of healthy adults.Methods:① To evaluate the of image of related structure,using spiral CT in scanning four skull specimens,get the sagittal diameter of mastoid(the horizontal distance form the lowest point of external auditory inferior canal to the rear edge of mastoid) and the height(the vertical distance between the lowest point of external auditory canal wall to the mastoid tip) in the sagittal position.And then to measure the distance of skull specimens in the same lay with CT image,and discuss the statistic difference of the distance between the values of CT imaging measurements and the measurements on hand;② Study on people: 118 patients(236 sides) with non-ear disorders were randomly selected,among which there were 63 females(126 sides) and 55 males(110 sides).The sagittal diameter of mastoid(set the final margin of external ear door as point A,and draw a horizontal line from point A to interact the rear edge of mastoid with point B.The distance between point A and B is just the sagittal diameter of mastoid) and the mastoid height(set the mastoid tip as point C,and then draw a vertical line from point C to line AB,intersecting at point D,and the distance of line CD is the height of the mastoid) were measured in the sagittal position.And then all people were subjected to maxillofacial CT scan in the same layer used above,and the diameter and height of the mastoid were measured.In addition,half of the product of diameter and height of the mastoid was defined as mastoid area.Then related analysis and regression analysis were done between surface measurements and imaging measurements of mastoid diameter.Results:① Part of the experiment: there was no significantly different on the indicator values between CT image the entity measurements among the four skull specimens(P0.05);② Study on people: there was no significantly different between left side and right side(P0.05),but significantly different between genders(P0.05).Between surface measurements and imaging measurements of mastoid diameter there is positive correlation,and the relevance has the remarkable significance.Conclusion:The new method described in this study is convenient and useful.And as mastoid area of inner was evaluated by as mastoid area of surface.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot