上颌骨和下颌骨CT的辐射剂量一定高于传统全景X线摄影的辐射剂量吗？
Must radiation dose for CT of the maxilla and mandible be higher than that for conventional panoramic radiography?
作者信息
Diederichs C G, Engelke W G, Richter B, Hermann K P, Oestmann J W
机构信息
Department of Radiology, Georg-August-University of Goettingen, Germany.
出版信息
AJNR Am J Neuroradiol. 1996 Oct;17(9):1758-60.
We evaluated the feasibility of performing preoperative spiral CT of the maxilla and mandible with a radiation dose similar to that used for conventional panoramic radiography. The skin entrance doses of radiation used for spiral CT (collimation, 1 mm; pitch, 2; tube voltage, 80 kV; tube current, 40 mA) and for panoramic radiography (75 kV, 8 mA, 15 seconds) were measured in one patient by using thermoluminescent dosimeter chips. Results were 0.56 +/- 0.06 mGy for CT and 0.59 +/- 0.04 mGy for radiography. Image quality was adequate for preoperative implant planning. Spiral CT of the mandible and maxilla may therefore be feasible with a radiation dose of similar magnitude as that used for conventional panoramic radiography.
我们评估了进行上颌骨和下颌骨术前螺旋CT检查的可行性，其辐射剂量与传统全景X线摄影所用剂量相似。通过使用热释光剂量计芯片，在一名患者身上测量了螺旋CT（准直1mm；螺距2；管电压80kV；管电流40mA）和全景X线摄影（75kV，8mA，15秒）的皮肤入射辐射剂量。CT检查结果为0.56±0.06mGy，X线摄影结果为0.59±0.04mGy。图像质量对于术前种植计划而言足够。因此，下颌骨和上颌骨的螺旋CT检查在与传统全景X线摄影相似的辐射剂量下可能是可行的。
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