颅容积的放射片推测

AN ESTIMATION OF CRANIAL CAPACITY FROM RADIOGRAM

颅容积对鉴别颅骨的性别和人种具有一定的意义.对颅容积的推算,以往多采用颅骨的外测量,回归方程的推算值与实测值,相差在4%以上.为提供更准确的、既可应用于颅骨、也可用于活体或含脑的头标本的推算颅容积的回归方程,对33例除去脑的尸头进行了以水和小米为介质测量颅容积,并在正、侧位X-线片上测量了5项颅内径线和正侧位面积,得出几个回归方程式和常数公式.其r值在0.83～0.96.经回代其推测值与实测值相差<4%,其中回归方程(Y=0.429×矢状面积×颅内宽+182.21)仅差2.15%,具有实用意义.

Cranial capacity is of very importance in determining sex and race. External measurements of the cranium were usually used in the past to estimate cranial capacity. The difference between the values of the estimation from regression analysis and the actual measurement is more than 4%-We used millet or water to measure the capacity of 33 crania with the brain removed. We measured five internal diameters of the cranium as well as sagittal and coronary areas from antero-posterior and lateral cephalograms. Several regression equations and constant equations were established from these measurements. The r-value fluctuated from 0. 86 to 0. 96- The difference between the value of estimation from regression equations and that of the actual measurement was less than 4%. The error of a best regression equation (Y = 0. 429 X sagilttal area X intracranial breadth +182.81) was only 2.15%. The new regression equation is of practical significance.