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Curr Probl Diagn Radiol ; 48(3): 229-234, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-29576415

RESUMEN

PURPOSE: To determine distances between patient centroid and gantry isocenter during CT imaging of the chest, abdomen, and/or pelvis, and to evaluate differences based on patient gender, scan region, patient position, and gantry aperture. MATERIALS AND METHODS: A water phantom and an anthropomorphic phantom were imaged in the centered position in the CT gantry and at several off-centered positions. Additionally, data from 57,621 adult chest, abdomen, and/or pelvic CT acquisitions were evaluated. Data were analyzed with an analysis of variance using the centroid-to-isocenter data as the dependent variable and the other parameters as independent variables. RESULTS: The majority of patient acquisitions (83.7% (48271/57621)) were performed with the patient's centroid positioned below isocenter (mean 1.7 cm below isocenter (SD 1.8 cm); range 12.1 cm below to 7.8 cm above isocenter). Off-centering in the x-axis was less severe (mean 0.01 cm left of isocenter (SD 1.6 cm)). Distance between centroid and isocenter in the y-axis did not differ as a function of sex but did differ based on scan region, patient position, and gantry aperture. CONCLUSION: Off-centering is common during CT imaging and has been previously demonstrated to impact dose and image quality.


Asunto(s)
Posicionamiento del Paciente/estadística & datos numéricos , Radiografía Abdominal/instrumentación , Radiografía Torácica/instrumentación , Tomografía Computarizada por Rayos X/instrumentación , Adulto , Anciano , Femenino , Humanos , Masculino , Persona de Mediana Edad , Fantasmas de Imagen , Prevalencia
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