Browsing by Author "Bowdler, M. W."
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- Paediatric phantom dose optimization using digital radiography with variation of exposure parameters and filtration whilst minimising image quality impairmentPublication . Lança, Luís; Bowdler, M. W.; Creedon, J.; Dayer, V.; Stensholt, N.; Pinhão, S.; Visser, M. B.; Jorge, JoséObjective: To induce a reduction in dose, using a paediatric phantom, through the variation of exposure parameters and filtration, without adversely affecting image quality. Methods: All images were acquired using a Kyoto Kagaku paediatric phantom and a Canon DR detector. The phantom was positioned supine for all projections: wrist (DP, lateral) and ribs (AP, oblique). Three dose protocols were established using different mAs values (high, medium and low) and copper (Cu) filtration was added to each protocol. DAP was used to calculate the ESD for each exposure. Using ImageJ, CNR was calculated for the physical measurement of image quality. Image quality was assessed by fifteen observers (visual grading analysis (VGA)). Results: The highest doses were recorded with the high dose protocol, ranging from 5.60-39.22μGy for the wrist and 5.33-129.67μGy for the ribs. When increasing the Cu filtration a decrease in ESD was observed. A difference of 0.1 in VGA score was noted between high and low dose protocols without the use of filtration, while a difference of 0.3 was noted when using filtration. As mAs increased, VGA scores increased. Fracture visibility was minimally affected by Cu filtration or projection variation. Conclusion: The variation of exposure parameters in digital radiography can achieve a dose reduction without impairing image quality in bone fractures. Superior image quality can be achieved for DP and lateral wrist projections without Cu filtration. However, the addition of Cu filtration for the rib projections has almost no impact on overall image quality.
- Paediatric phantom dose study using digital radiography with variation of exposure parameters and filtrationPublication . Lança, Luís; Bowdler, M. W.; Creedon, J.; Dayer, V.; Stensholt, N.; Stuivenberg, V.; Pinhão, S.; Visser, M.; Jorge, JoséPaediatric digital radiography remains a challenge for many radiographers. The subsequent need for focused paediatric care is outlined by ‘The Image Gently Campaign’, which reports a lack of both expertise and educational resources surrounding this area. This requirement is reinforced by The International Commission on Radiological Protection (ICRP), which identifies a need for both optimisation and consistency in digital paediatric imaging. Although a considerable proportion of recent research surrounds paediatric diagnostic imaging, Jones et. al highlights an absence of literature regarding optimisation in paediatric extremity imaging.This is of particular importance when considering paediatric patients who, due to their additional life expectancy and increased tissue radio-sensitivity, are considerably more sensitive to the detrimental effects of ionising radiation. Although the radiation dose received for diagnostic purposes is low, it is pertinent that each exposure be minimised due to the cumulative nature of radiation. The question to be addressed through our study is as follows; using a paediatric phantom with multiple bone fractures, could the variation of exposure parameters and filtration in digital radiography achieve a reduction in dose without substantially affecting image quality? This study aims to evaluate the variation of exposure parameters and filtration in image quality and dose in a paediatric phantom study using a digital radiography (DR) wireless detector.