TLD법과 Monte Carlo Simulation에 의한 CT Organ Dose의 비교

The Comparison of Monte Carlo Simulation to TLD Method m CT Organ Dose

The TLD method, which is used in measuring organ dose in computed tomography, needs high-priced equipments and much time. On the other hand, Monte Carlo simulation makes it possible to measure organ dose with comparative ease. However, the problem is that it is doubtful whether the result estimated by the simulation is trusty. For this reason, the organ dose outputted from Monte Carlo simulation was compared with that of TLD method under the same condition. The organ dose actually measured by TLD method was compared under the condition samewith the organ dose outputted from Monte Carlo simulation, from two aspects. First, the organ dose of the lungs was measured under 4 slice MDCT, 8 slice MDCT and 16 slice MDCT, respectively, concerning the computed tomography on chest in order to compare the two organ doses as to the type of equipment. Second, the organ dose of liver was measured by varying beam collimation and beam pitch, concerning the computed tomography on abdomen under 16 slice MDCT so as to compare the organ dose outputted by various scan parameters. As the result, Monte Carlo simulation was lower between 16 and 18 percent than TLD method, in the organ dose of the lungs concerning the CT on chest. Likewise, the result of Monte Carlo simulation was lower between 34 and 38 percent than that of TLD method, under various conditions of scan parameter.