MISURA DELLA DIPENDENZA DAL NUMERO DI MASSA DELLA REAZIONE PIONE POSITIVO PIONE POSITIVO E PIONE POSITIVO/NEGATIVO SU NUCLEI

1994/1995VIII Ciclo1964Versione digitalizzata della tesi di dottorato cartacea

Performance evaluation of three computed radiography systems using methods recommended in American Association of Physicists in Medicine Report 93

The performances of three clinical computed radiography (CR) systems, (Agfa CR 75 (with CRMD 4.0 image plates), Kodak CR 850 (with Kodak GP plates) and Kodak CR 850A (with Kodak GP plates)) were evaluated using six tests recommended in American Association of Physicists in Medicine Report 93. The results indicated variable performances with majority being within acceptable limits. The variations were mainly attributed to differences in detector formulations, plate readers’ characteristics, and aging effects. The differences of the mean low contrast scores between the imaging systems for three observers were statistically significant for Agfa and Kodak CR 850A (P=0.009) and for Kodak CR systems (P=0.006) probably because of the differences in ages. However, the differences were not statistically significant between Agfa and Kodak CR 850 (P=0.284) suggesting similar perceived image quality. The study demonstrates the need to implement quality control program regularly