顎関節Ｘ線ＣＴ検査の被曝線量と撮影条件の検討

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  • Integral Absorbed Dose at Optimal Exposure Condition in Spiral CT for the Temporomandibular Joint

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The purpose of the study was to optimize exposure condition on spiral CT for the temporomandibular joint and to calculate patient radiation dose under optimal exposure conditions. For measurement of exposure, a chamber was fixed on the detector of the spiral CT apparatus. The tube voltages used were 100kV, 120kV and 130kV, and the tube currents were 25mA, 50mA, 100mA, 200mA and 300mA. Exposure time was 1 second. The integral absorbed dose was calculated by the Energy Fluence method. The temporomandibular joint region of the phantom was scanned by CT at tube voltages of 100kV, 120kV and 130kV, and tube currents of 25mA, 50mA, 75mA, 100mA, 125mA and 150mA. Table feed speed was fixed at 1mm per rotation. Sagittal image of the temporomandibular joint was reconstructed from axial images. These images were assessed for their image quality using a five-point scale. The lowest exposure condition in clinical application was 120kV, 75mA and 1 mm per rotation. The integral absorbed dose during CT examination of the temporomandibular joint was 104mJ under this condition. This was approximately three times greater than that of tomographic examination of the same region.

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  • 歯科放射線

    歯科放射線 43 (3), 113-120, 2003

    特定非営利活動法人 日本歯科放射線学会

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