上顎癌と副鼻腔炎のEMI値

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The significance of EMI units for differential diagnosis between maxillary sinusitis and cancer was studied using an EMI 5005/12 CT scanner. The materials studied were 13 cases of sinusitis and 13 cancers with 9 normal pterygoideus lateralis muscles as the control.EMI units of 320×320 matrix were changed into 64×64 matrix, by averaging of 25 (5×5) points. The mean value and standard deviation of EMI units in the region of interest (R. O. I.) for sinusitis were 18.4 and 8.01, respectively, 24.6 and 12.18 for cancer, 21.1 and 4.83 for the normal pterygoideus lateralis muscle.The conclusions were as follows: (1) The mean value of EMI units for maxillary cancer was higher than maxillary sinusitis. (2) The variances of EMI units for both cancer and sinusitis were higher than the normal pterygoideus lateralis muscle. The reason seems to be as follows: in the case of cancer, the bone tissue may be involved in the cancer tissue, while in the case of sinusitis, inflammatory secretion or swelling of the mucous membrane exist in the sinus depending on the type of the disease.
耳鼻咽喉科臨床学会の論文