A parametrization of the CT number of a substance and its use for stoichiometric calibration. [artículo]
Por: Gilarranz Moreno, Rosa [Radiofísica Hospitalaria]
| Martínez Gómez, Luis Carlos [Radiofísica Hospitalaria] | Manzanas Artigas, María Jesús [Radiofísica Hospitalaria].
Colaborador(es): Servicio de Radiofísica Hospitalaria.
Tipo de material: 
LibroEditor: Physica Medica, 2012Descripción: 28(1):33-42.Recursos en línea: Solicitar documento Resumen: A method to carry out stoichiometric calibrations of CT scanners employed in radiotherapy treatment planning is proposed. The method is based on a simple parametrization of the CT number of a substance, which involves only two variables to describe the substance (electron density and one effective atomic number) and one parameter to describe the beam. The method was tested experimentally on a group of beams. A set of no tissue-like substances of known densities and elemental compositions were employed as calibrators. CT number-to-density curves (RED curves) were calculated with the proposed parametrization and compared to those measured with a commercial density phantom. Differences between the electron densities assigned by the calculated RED curves and the measured ones were in the range 0.009-0.019 (RMS). The proposed method may be employed to carry out accurate stoichiometric calibrations by using only one suitable substance as calibrator, not necessarily tissue-like.
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Artículo
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Formato Vancouver:
MartÍnez LC, Calzado A, RodrÍguez C, Gilarranz R, Manzanas MJ. A parametrization of the CT number of a substance and its use for stoichiometric calibration. Phys Med. 2012 Jan;28(1):33-42.
PMID: 21419682
Contiene 21 referencias
A method to carry out stoichiometric calibrations of CT scanners employed in radiotherapy treatment planning is proposed. The method is based on a simple parametrization of the CT number of a substance, which involves only two variables to describe the substance (electron density and one effective atomic number) and one parameter to describe the beam. The method was tested experimentally on a group of beams. A set of no tissue-like substances of known densities and elemental compositions were employed as calibrators. CT number-to-density curves (RED curves) were calculated with the proposed parametrization and compared to those measured with a commercial density phantom. Differences between the electron densities assigned by the calculated RED curves and the measured ones were in the range 0.009-0.019 (RMS). The proposed method may be employed to carry out accurate stoichiometric calibrations by using only one suitable substance as calibrator, not necessarily tissue-like.
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