Percorrer por autor "Vañó, Eliseo"
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- Diagnostic reference levels in plain radiography for paediatric imaging: a portuguese studyPublication . Paulo, Graciano; Vañó, Eliseo; Rodrigues, AdrianaObjective: To determine diagnostic reference levels (DRLs) for the most frequent paediatric plain radiography examinations in Portugal (chest, pelvis and abdomen) and to characterise a standard paediatric patient for each age group used in literature. Methods: Anthropometric data was collected from 9935 patients. Each age group (<1, 1-<5, 5-<10, 10-<16, ≥16) was categorised by the median values of weight, height and BMI, to define a standard patient. Exposure parameters, kerma-area product (KAP-mGy cm2) and entrance surface air kerma (ESAK-μGy) were collected. DRLs for KAP and ESAK were defined as the 75th percentile (P75) of dose values and presented by age and weight. Results: In each age group the P75 of KAP varied from 11 to 77 mGy cm2 for chest; 23-816 mGy cm2 for pelvis; 25-979 mGy cm2 for abdomen. The P75 of ESAK varied from 49 to 67 μGy for chest; 98-1129 μGy for pelvis and 70-1060 μGy for abdomen. Conclusion: The P75 of dose values determined in this study were lower than those published in literature. When available, weight is the preferred parameter to categorise paediatric patients. The large ranges of dose values found in this study, demonstrates a clear need for the optimisation and harmonisation of practice.
- Management of patient and staff radiation dose in interventional radiology: current conceptsPublication . Bartal, Gabriel; Vañó, Eliseo; Paulo, Graciano; Miller, DonaldThe increasing complexity and numbers of interventional fluoroscopy procedures have led to increasing patient doses of radiation and to increasing concern over staff doses. Hybrid rooms incorporate multiple imaging modalities and are used by multidisciplinary teams in interventional fluoroscopy suites and operating theaters. These rooms present additional radiation protection challenges. The new low annual exposure limit for the lens of the eye also requires specific measures to prevent cataracts in operators. The traditional attitude of radiation protection must be changed to one of proactive management of radiation dose and image quality. Incorporation of a comprehensive dose management program into the departmental quality assurance program is now essential. Physicians, radiographers, and medical physicists play an essential role in the safe use of fluoroscopy in medical practice. Efficient use of all imaging modalities (e.g., fluoroscopy, digital subtraction angiography, cone-beam CT) requires knowledge of the effects of different equipment settings on patient and staff doses as well as the skill and competence to optimize these settings for each procedure and patient. Updates and recommendations on radiation protection and dose management programs, including aspects of education and training, are presented.