Paediatric phantom dose optimisation using digital radiography with variation of exposure parameters and filtration whilst minimising image quality impairment

Lança, L. (Escola Superior de Tecnologia da Saúde de Lisboa, Lisbon, PT ; Karolinska Institutet, Stockholm, SE) ; Bowdler, M.W. (School of Health Sciences, University of Salford, Manchester, UK) ; Creedon, J. (niversity College Dublin, Dublin, IE) ; Dayer, Valentin (HESAV School of Health Sciences, HES-SO University of Applied Sciences and Arts Western Switzerland) ; Stensholt, N. (Oslo and Akershus University College of Applied Sciences, Oslo, NO) ; Stuivenberg, V.H. (Department of Medical Imaging and Radiation Therapy, Hanze University of Applied Sciences, Groningen, NL) ; Pinhão, S. (Escola Superior de Tecnologia da Saúde de Lisboa, Lisbon, PT) ; Visser, M.B. (Department of Medical Imaging and Radiation Therapy, Hanze University of Applied Sciences, Groningen, NL) ; Pires Jorge, José A. (HESAV School of Health Sciences, HES-SO University of Applied Sciences and Arts Western Switzerland)

Objective: 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.


Faculty:
Santé
Branch:
Technique en radiologie médicale
School:
HESAV
Institute:
Unité de recherche en santé, HESAV
Subject(s):
Santé
Publisher:
Oslo, Oslo and Akershus University College of Applied Sciences
Date:
2018-01
Oslo
Oslo and Akershus University College of Applied Sciences
Pagination:
15 p.
Published in:
OPTIMAX 2017 : Radiation dose, image quality optimisation, the use of new technology in medical imaging
Author of the book:
Meijer, Annemiek ; Department of Medical Imaging and Radiation Therapy, Hanze University of Applied Sciences, Groningen, The Netherlands
Buissink, Carst ; Department of Medical Imaging and Radiation Therapy, Hanze University of Applied Sciences, Groningen, The Netherlands
Hogg, Peter ; School of Health Sciences, University of Salford, Greater Manchester, United Kingdom
ISBN:
978-1-912337-09-05
External resources:
External resources:
Appears in Collection:



 Record created 2018-12-02, last modified 2019-04-11

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