Introduction: Chest X-ray in children is the most common procedure. The methodes of choice are anteroposterior projection (from front to back), wich are mostly used in younger children, or posteroanterior projection (from back to front), mostly used in children older than 5 years. General and exposure conditions are also adjusted for the child's age and their physical and mental conditions. Purpose: The purpose of this diploma work is to figure out whether there are some differences between theory and practice between students and radiologic technologists wich already work in practice. We also wanted to find out wether radiologic technologists work in accordance with good radiological practice – congruent with the latest findings from the references, and in wich areas they could improve their knowledge. Methods: First we made an overview of literature and then did a survey with a questionnaire Image Gently. Interviewees were students of radiologic technology from the third year of undergraduate studies and students from the second year of postgraduate studies. The questiones were answered from their experiences during practical classes and practical training. To solve the survey the students had to do clinical practice in pediatric clinic beforehand. After answering the questionnaire we analyzed the results and then compared them to the survey (Salmič, Starc, 2016). Results: 37 students (37%) completed the survey. The results of the survey showed that respondents check the identity of patients, give instructions to patients and their parents, regularly screen the field. Areas where radiologic technologists could improve their skills is in checking the patients' exposure dose. Discussion and conclusion: Big differences were expected between the theory and practice among the respondents of both surveys. Some bigger differences emerged, which we wanted to point out, and may need to be given more attention in similar further researches. Therefore we would help to improve transfering theory into practice and increase awareness for the future generations in this matter.