Gorycki Tomasz, Kamiński Kamil, Studniarek Michał, Szlęzak Przemysław, Szumska Agnieszka
Department of Radiology, Medical University of Gdańsk, Gdańsk, Poland ; Department of Imaging Diagnostics and Interventional Radiology, Franciszek Łukaszczyk Oncology Center in Bydgoszcz, Bydgoszcz, Poland.
Department of Imaging Diagnostics and Interventional Radiology, Franciszek Łukaszczyk Oncology Center in Bydgoszcz, Bydgoszcz, Poland.
Pol J Radiol. 2014 Apr 14;79:75-8. doi: 10.12659/PJR.889951. eCollection 2014.
The most commonly used form of reporting doses in multislice computed tomography involves a CT dose index per slice and dose-length product for the whole series. The purpose of this study was to analyze the actual dose distribution in routine chest CT examination protocols using an antropomorphic phantom.
MATERIAL/METHODS: We included in the analysis readings from a phantom filled with thermoluminescent detectors (Art Phantom Canberra) during routine chest CT examinations (64 MDCT TK LIGHT SPEED GE Medical System) performed using three protocols: low-dose, helical and angio-CT.
Mean dose values (mSv) reported from anterior parts of the phantom sections in low-dose/helical/angio-CT protocols were as follows: 3.74; 16.95; 30.17; from central parts: 3.18; 14.15; 26.71; from posterior parts: 3.01; 12.47; 24.98 respectively. Correlation coefficients for mean doses registered in anterior parts of the phantom between low-dose/helical, low-dose/angio-CT and helical/angio-CT protocols were 0.49; 0.63; 0.36; from central parts: 0.73; 0.66; 0.83, while in posterior parts values were as follows: 0.06; 0.21; 0.57.
The greatest doses were recorded in anterior parts of all phantom sections in all protocols in reference to largest doses absorbed in the anterior part of the chest during CT examination. The doses were decreasing from anterior to posterior parts of all sections. In the long axis of the phantom, in all protocols, lower doses were measured in the upper part of the phantom and at the very lowest part.
多层计算机断层扫描中最常用的剂量报告形式包括每层的CT剂量指数和整个系列的剂量长度乘积。本研究的目的是使用人体模型分析常规胸部CT检查方案中的实际剂量分布。
材料/方法：我们纳入了在使用三种方案（低剂量、螺旋和血管造影CT）进行的常规胸部CT检查（64排MDCT TK LIGHT SPEED GE医疗系统）期间，对填充有热释光探测器的模型（Art Phantom Canberra）的读数分析。
在低剂量/螺旋/血管造影CT方案中，模型各部分前部报告的平均剂量值（mSv）如下：3.74；16.95；30.17；中部：3.18；14.15；26.71；后部：3.01；12.47；24.98。低剂量/螺旋、低剂量/血管造影CT和螺旋/血管造影CT方案中，模型前部记录的平均剂量的相关系数分别为0.49；0.63；0.36；中部：0.73；0.66；0.83，而后部的值如下：0.06；0.21；0.57。
在所有方案中，所有模型部分的前部记录到的剂量最高，这与CT检查期间胸部前部吸收的最大剂量相关。所有部分的剂量从前往后递减。在模型的长轴上，在所有方案中，模型上部和最底部测量到的剂量较低。
