Optimizing the chest X-ray technique PA
DOI:
https://doi.org/10.51481/amc.v44i4.431Keywords:
radiología, tórax, dosis, contrasteAbstract
Objective:Low kilovoltages (<100 kVp) to obtain chestfilms are commonly used in Costa Rica, regardless of inter-national recommendations. This study aims to demonstratethat at higher kVps the visualization of low contrast objectsis improved and that the absorbed doses are lower.Methods:Two chests films, one at high kVp and one at lowkVp, were taken to 11 patients. At the skin of each patient,two TLD-100 chips were placed to record the entrance skindoses, the chips were analyzed at the Nuclear PhysicsLaboratory of the University of Costa Rica. Using theanatomic criteria test tool 28 radiologists compared theanatomic findings for each technique.Results:At higher kVps the average entrance skin doseswere lower by 40% and the overall contrast of the image wasdecreased between 10% to 50%. The anatomic criteria testtool gave a total of 448 positive points, showing a clear pref-erence for the high kilovoltaje technique.Conclusions:The optimization of chest studies based on theratio risk versus benefit shows that high kilovoltage tech-niques should be implemented in our country due to thediminution in the delivered doses and an improved visualiza-tion of the anatomy shown in the chest film according to theinterpreting radiologists.
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