Digital chest radiography with a solid-state flat-panel x-ray detector: contrast-detail evaluation with processed images printed on film hard copy.

摘要: PURPOSE: To evaluate and compare human observer performance in a contrast-detail test by using postprocessed hard-copy images from digital chest radiography system conventional screen-film radiographs. MATERIALS AND METHODS: The is based on large-area flat-panel x-ray detector with structured cesium iodide scintillator layer an amorphous silicon thin-film transistor array for image readout. Images of phantom were acquired at two exposure levels standard thoracic systems the matched dose. By processed postprocessing techniques, four-alternative forced-choice perception study was performed, number detectable signals (disk-shaped objects 0.3–4.0 mm diameter) determined each type. RESULTS: On average, observers detected more than radiographs all diameters up to...