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Direct Vs Indirect Digital Systems: Local Diagnostic Reference Levels for Chest Radiography in Postero-Anterior Projection in two Portuguese Hospitals

2013; ALIES - Associação Lusófona para o Desenvolvimento da Investigação e do Ensino das Ciências da Saúde; Volume: 10; Issue: 2 Linguagem: Inglês

10.19277/bbr.10.2.63

2182-2379

Joana Oliveira, Marilia Mourato, Carlos Domingos, Ricardo Miranda, Paulo Almeida Pereira, Ricardo Grilo, Jorge Frutuoso,

Radiology practices and education

This study intended to evaluate and compare radiation doses collected from a sample of 69 patients in two hospitals where chest radiography is carried out using different methods of digital image acquisition, direct and indirect, in postero-anterior (PA) projection.For the two hospitals, entrance skin doses (ESD) and effective dose (E) were measured using PCXMC software for posterior comparison with each other, as well as with international references.For Hospital A, with direct digital acquisition, average ESD was 0,089 mGy and average E was 0,013 mSv.For Hospital B, with indirect digital acquisition, average ESD was 0,151 mGy and average E was 0,030 mSv.In both hospitals, average doses did not exceed the limits recommended by law (0,3 mGy).In the chest X-ray, in PA projection, the local DRLs calculated were 0.107 mGy, in Hospital A and 0.164 mGy, in Hospital B. In chest PA radiography, the utilization of a direct acquisition system implies a dose decrease of 41 %, in agreement with the available references that point to dose reductions of around 50 % between the direct and indirect acquisition systems.