Evaluation of entrance surface dose and justification of pediatrics chest radiography in three university-affiliated hospitals at Yaounde - Cameroon: Évaluation de la dose d’entrée de surface et de la justification des radiographies thoraciques de l’enfant dans trois hôpitaux universitaires de Yaoundé - Cameroun
| Autor: | Moulion Tapouh, Jean Roger, Bitjong Ndombol, Grégory, Ouogue Teingueng, Francisse Xavier, Dongmo Fomekong, Sylviane, Samba, Odette Ngano, Moifo, Boniface |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Journal Africain d’Imagerie Médicale; Vol. 14 No. 3 (2022); 183-192 |
| ISSN: | 1810-4959 2790-9840 |
| Popis: | Objective : Evaluate the patient radiation doses and the justification of chest radiography in children, in Yaoundé – Cameroon.Methods : A cross-sectional study was carried out on 118 children aged from 0 to 15 years in the Radiology units of Yaoundé gyneco-obstetrical and pediatric Hospital, University Hospital Center, and the Medical Centre of CNPS within 5 months (January – Mai 2016). The justification of the chest radiographies was evaluated from the pertinence of the clinical indications. The clinical information were categorized and compared to the recommendations of the Radiology Good practice guide. The Entrance Surface Dose (ESD) was calculated using the Davies formula (ESAK) = O/P × (kV/80)2 × (100/DFP) 2× mAs × BSF ; where the X-Ray tube output (OP) of the radiology equipment was calculated for a voltage of 80 KV and a charge of 20 mAs, with a source to skin distance of 1 metre. The other data collected and analyzed where the qualification of the prescriber, the age, height and Body mass index of the patients.Results : 21 radiographies where excluded due to poor image quality. The three X-ray machines included in the study were analog radiography, Digital Radiography and Computed Radiography. In our study, 58% of patients were male. The largest age group was children aged 2 to 12 months (38, 1%). The mean age was 39.08 months (± 47.6). The radiography was justified in 82.5% of cases regardless of the qualification of the prescriber. In 74% of cases, the ballots showed no research question. There was no significant correlation between the prescriber and the justification of the radiography. The X-ray tube voltage varied between 50 and 121 kV, while the average charge was 2.78 mAs (± 1.4). The source to skin distance ranged between 104 and 189 centimeters, with an average of 146 cm (± 15). We observed a high variability of the voltage used in infants, between 80 and 100 kV. The lowest charge values (1.3 ± 0.3 mAs) were used in CHE / CNPS, highest values (6.5 ± 3.5) were delivered to new-born in HCY. The values of the entrance surface doses generally ranged from 21.1 to 304.1 μGy with an average of 117.3 (± 53.1) μGy.Only the analog radiography equipment of HCY had X-ray filters of at least 2.5 mm Al corresponding to the minimum recommendations of the RP 162 of the European Commission. However, the X-Ray tube output of the HCY’s radiography device calculated (18.09 μGy / mAs) was Inferior to the normal according to IAAE. The values of ESD in HGOPY and CHE / CNPS were higher than those recommended by the NRPB and the European Commission. The value of ESD generally increased with age. The study highlighted the fact that the ESD value decreased as the source to skin increased. Meanwhile, the ESD value increased as the voltage and charge increased (r = 0.407; p |
| Databáze: | OpenAIRE |
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