側頭骨 CT における異なるスキャン角度の診断的描出能の比較

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Computed tomographic (CT) scanning has made significant contributions to the diagnosis and evaluation of temporal bone lesions by the thin-section, high-resolution techniques. However, these techniques involve greater radiation exposure to the lens of patients. A means was thus sought for reducing the radiation exposure at different scanning angles such as+15 degrees and -10 degrees to the Reid's base line. Purposes of this study were to measure radiation exposure to the lens using the two tomographic planes and comparison was made of the ability to visualize auditory ossicles and labyrinthine structures. Visual evaluation of tomographic images on auditory ossicles was made by blinded methods using four rankings by six radiologists. The statistical significance of the intergroup difference in the visualization of tomographic planes was assessed for a significance level of 0.01. Thermoluminescent dosimetor chips were placed on the cornea of tissue equivalent to the skull phantom to evaluate radiation exposure for two separate tomographic planes. As the results, tomographic plane at an angle of -10 degrees to Reid's base line allowed better visualization than the other plane for the malleus, incus, facial nerve canal, and tuba auditiva (P<0.01). Scannings at an angle of -10 degrees to Reid's base line reduced radiation exposure to approximately one-fiftieth (1/50) that with the scans at the other angle.
公益社団法人日本放射線技術学会の論文
1992-04-01

側頭骨 CT における異なるスキャン角度の診断的描出能の比較

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