Control de calidad para PET/RM basado en maniquíes experimentales con evaluación de factores de degradación por movimiento respiratorio
DOI:
https://doi.org/10.37004/sefm/2024.25.1.004Palabras clave:
PET/RM, control de calidad, maniquíes experimentales, movimiento respiratorio, corrección por atenuaciónResumen
El objetivo de este estudio es crear una prueba de control de calidad (CC) basada en maniquíes experimentales para equipos híbridos PET/RM. Se ha validado un método que minimiza el error en los mapas de atenuación (MA) para medidas de maniquíes con PET/RM, y se ha implementado en el CC para evaluar el impacto de distintos factores de degradación por movimiento respiratorio.
Se empleó el maniquí MRI-QUASAR-Motion con insertos de impresión-3D, así como la herramienta Duetto para generar los MA a partir de tomografías computarizadas (MA-TC). Mediante coeficientes de recuperación (CR), se cuantificó el impacto de la compensación de movimiento en los MA, la discriminación de ciclos irregulares y el promediado para las fases respiratorias co-registradas en imágenes PET. No se observaron mejoras significativas al compensar el movimiento en los MA (p=0.31) ni al discriminar ciclos irregulares (p=0.16). Tampoco se observaron diferencias significativas entre estimar la concentración en cada fase respiratoria y promediar su valor (RCconcentración=0.982±0.013) o estimarlo en la imagen promedio de las fases respiratorias (RCconcentración=0.978±0.009).
Nuestra prueba de CC permite recomendar evitar el postproceso que implica la compensación de movimiento respiratorio en los MA, la discriminación de ciclos respiratorios irregulares y el co-registro de las fases respiratorias.
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