Introduction: X-ray imaging of the chest and lumbar spine are among the most common X-ray examinations and have the highest doses in classic X-ray diagnostics. The dose can be reduced by proper field collimation and centring and correct exposure parameters, while still retaining proper image quality. Purpose: The purpose of this research is to see the percentage of technically useful images and to determine, if there are significant differences in x-ray fields collimation and doses between radiography students within technically acceptable images. Methods: We used an experimental method, where our 124 subjects took 4 x ray images of the PBU 60. The measurements were processed in PCXMC 2.0 and IBM SPSS STATISTICS 20 program. Results: With the thoracic spine in AP view, the differences were not significant when comparing the frequencies of technically useful images, but they were statistically significant in DAP, mAs values and effective dose comparison, where 1st year students had the lowest values. When compared to the values suggested in literature, the student values were much lower. With the lateral view of the thoracic spine, the differences were significant only with the field size and a few organ doses within technically acceptable images. When we compared the values to literature, the students got drastically lower values again. With the AP view of the lumbar spine the differences were significant when comparing frequencies of technically acceptable images, where 1st years students had the most difficulties. The differences were also significant when comparing mAs values. With the lateral view of the lumbar spine, the frequencies of technically acceptable images were significant again and 1st year students had the most problems here as well. There were also significant differences in field size and in some cases of organ doses. The DAP and effective doses were again much lower than the suggested values from literature. Discussion and conclusion: With this research, we found out that the percentage of diagnostically useful images was the highest in post-graduate group, but in some cases within the acceptable images they had the highest dose values, so we cannot say that one group exceeds all. It would be interesting to redo this research in a few years and to compare these results with similar research from abroad.
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