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| Format: | Artículo científico |
| Language: | en |
| Published: |
Sociedade Brasileira de Proteção Radiológica - SBPR
2022
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| Online Access: | https://www.redalyc.org/articulo.oa?id=722280973004 |
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Table of Contents:
- Comparison between two methods for estimation of Equilibrium Dose in MSCT procedures Stefani Y.N D. Y Nersissia P.R Costa Biología CTDI100 Equilibrium Dose Computed Tomography The CTDI100 underestimates the dose indicator due the scattering beyond the scanning length of 100mm of the measurement. A proposed method to obtain the dose (including the “tail” of the dose distribution) is a measurement on a large phantom to estimate the dose indicator on an ideal infinitum large phantom (equilibrium dose, Deq. As the scanning length increases, the dose indicator grows asymptotically. Monte Carlo simulations previously obtained were adopted in the present work. It includes simulations performed considering different scan lengths and different combinations of protocols of voltage, pitch, diameter and axis of simulation. Using an empirically characterized function of the experimental data, two methods to estimate the equilibrium dose were evaluated. One method is algebraically manipulating the function, and another is using the LevenbergMarquardt least squares method. The comparative evaluation of both methods demonstrates that higher values of the pitch results in a higher difference of both methods. The results demonstrate a good compatibility of the methods for the estimation of Deq. However, the results for a (scatter fraction) and Leq (equilibrium length) are significantly different when both methods are considered. 2022 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280973004 en http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.2A Vol.10