16排多层螺旋CT：通过热释光剂量测量法与蒙特卡罗模拟法进行剂量测定估算
16-detector multislice CT: dosimetry estimation by TLD measurement compared with Monte Carlo simulation.
作者信息
Groves A M, Owen K E, Courtney H M, Yates S J, Goldstone K E, Blake G M, Dixon A K
机构信息
Departments of Radiology and Medical Physics, Addenbrooke's Hospital NHS Trust and the University of Cambridge, Hills Road, Cambridge, UK.
出版信息
Br J Radiol. 2004 Aug;77(920):662-5. doi: 10.1259/bjr/48307881.
Computer simulations are widely used to estimate effective doses from CT examinations. The raw data often used in their estimations were obtained some years ago and made certain assumptions regarding CT unit design. At that time multidetector CT units were unavailable. Changes in design will limit the accuracy of computer simulated dosimetry on these machines. We therefore estimated CT dose on a 16-detector unit directly using thermoluminescent dosemeters (TLDs) and an anthropomorphic phantom. We found that the dose measured directly was 18% higher than the computer simulated dosimetry, in keeping with the previously recognised underestimation by computer simulation techniques compared with TLD measurements.
计算机模拟被广泛用于估算CT检查的有效剂量。其估算中常用的原始数据是几年前获得的，并且对CT设备设计做了某些假设。当时多排CT设备尚未问世。设计上的变化会限制这些设备上计算机模拟剂量测定的准确性。因此，我们使用热释光剂量仪（TLD）和仿真人体模型直接估算了16排CT设备的剂量。我们发现直接测量的剂量比计算机模拟剂量测定结果高18%，这与之前认识到的计算机模拟技术与TLD测量相比存在低估现象是一致的。
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