TY - JOUR AU - Stefani, Yuri AU - Nersissian, Denise Yanikian AU - Costa, Paulo Roberto PY - 2022/12/30 Y2 - 2024/03/28 TI - CT dose estimations using the ICRU/AAPM phantom JF - Revista Brasileira de Física Médica JA - Rev Bras Fis Med VL - 16 IS - SE - Artigo Original DO - 10.29384/rbfm.2022.v16.19849001685 UR - https://rbfm.org.br/rbfm/article/view/685 SP - 685 AB - <p><em>A proposed method to obtain the dose for Computed Tomography was evaluated on long a phantom, made of polyethylene. This phantom is 600 mm large. Adopting an empirical characterized function </em> <em>, a tendency of the asymptotical grow of the dose by the increase of the scanning length can estimate the dose in an infinite scanning length for a single axial rotation of the x-ray tube. The curve of </em> <em> was estimated for different clinical protocols: tension, pitch, head/body, and center/peripheral measurements. The ultrahigh molecular weight polyethylene phantom of 600 mm length, named ICRU/AAPM phantom, was proposed by a partnership between ICRU and AAPM (Task Group 200). This length provides a higher scanner length then PMMA phantom for </em> <em>, whose measurement is 100 mm</em><em>. The measures of ICRU/AAPM phantom were performed on General Electric, Toshiba, and Philips scanners. The measurement was performed on a thimble ion chamber inserted in the center or periphery of the phantom</em><em>. Using the measurements, </em> <em> functions (equilibrium dose, equilibrium length and scatter fraction) were obtained. A single scan has been demonstrated to be sufficient to obtain the </em> <em> function.</em></p> ER -