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Statistical Study on the Coefficients of Correlation between the Intracranial Spaces and the Arterial Calibers in the Normal Cerebral Angiograms
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KMID : 0378019600030020093
Abstract
In reading a cerebral arteriogram, often the "weasel words", let say---- `smallae s.ofthe,.irtpriallumen¢¥ are used without having an absolute signifcance. This ambiguous word; the `smallness! of arterial caliber must be said basing upon rather strict standard.
This `standard¢¥- should be eftablisbed in some way and followed when one mentions of `narrowing¢¥ of arterial shadow. Two methods, are arbitrarily considered to investigate the possibility of standardization; one method is to investigate the relative size correlated between the divisions of artery respectively shown ?¢¥ m a given film and to offer the-significance w1uni certain division or divisions are specifically - narrowed,¢¥ the other being to find the correlation between the inl0tTanial space and the size of an artery or arteries in the space. The last mentioned method will le described hers
Methods and Objects
With the same radiological condition, normal arteriogram4 taken left lateral, were selected.
1. Square measure of intracranial sqpyace was measured in mmf by means of a planimeter.
2. Each artery was divided after E. Fisdier¢¥s division e.g. Ai As and measured in - 10
-Ln1m by means of
the rule attached to micrometer.
3. 310 cases were studied and 82 cases were selected for accurate study. Because of radiographic obscurity I some division of an artery was studied only in 21 occasions.
Results
The t-test of R.A. Fisher was applied to the calculated coefficients. of correlation and probabilities were read. Probability of A3 was less than 0.001. The other, however, was larger than 0.02 and that of C2 was smaller than 0.7 and larger than 0.6. It is apparent that there is no statistically significant correlation if not all. S
Conclusion
Therefore, correlation between the intracranial space and the caliber of each artery is not highly significant in arteriogram to render adequate judgement that the size of an artery is normal or abnormal. One can¢¥t expect a smaller artery in a smaller space of the skull in an arteriogram and vice versa.
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