The lesioninvolves the lateral wall of the sphenoid sinus extending into the rightorbital apex, as demonstrated by loss of normal fat attenuation in thislocation.

此病变累及蝶窦外侧壁，侵入右侧眶尖，表现为此处正常脂肪消失。

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Mean CT attenuation values between normal pancreas and tumor and the number of metastasis of liver during the different phases were compared.

比较各期扫描正常胰腺组织与肿瘤的密度差异和肝转移瘤的发现率。

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Periodical attenuation of particles, which interferes seriously with the normal alumina production of Bayer method, exists in the alumina production process of Bayer method.

在拜耳法氧化铝生产中粒度依然存在着周期性细化现象，严重影响到拜耳法系统的正常运行。

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