Experimental article – Reducing effective dose to a paediatric phantom by using different combinations of kVp, mAs and additional filtration whilst maintaining image quality

Elsbeth Huizinga, Wouter Schaake, Ruurd Visser, Charlotte Bloomfield, Filipa Boavida, Diane Chabloz, Emilie Crausaz, Hanne Hustveit, Heidi Knight, Anna Pereira, Vanja Harsaker

Research output: Chapter in Book/Report/Conference proceedingContribution to conference proceedingAcademicpeer-review

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Abstract

Purpose: To determine whether using different combinations of kVp and mAs with additional filtration can reduce the effective dose to a paediatric phantom whilst maintaining diagnostic image quality.
Methods: 27 images of a paediatric AP pelvis phantom were acquired with different kVp, mAs and additional copper filtration. Images were displayed on quality controlled monitors with dimmed lighting. Ten diagnostic radiographers (5 students and 5 experienced radiographers) had eye tests to assess visual acuity before rating the images. Each image was rated for visual image quality against a reference image using 2 alternative forced choice software using a 5-point Likert scale. Physical measures (SNR and CNR) were also taken to assess image quality.
Results: Of the 27 images rated, 13 of them were of acceptable image quality and had a dose lower than the image with standard acquisition parameters. Two were produced without filtration, 6 with 0.1mm and 5 with 0.2mm copper filtration. Statistical analysis found that the inter-rater and intra-rater
reliability was high.
Discussion: It is possible to obtain an image of acceptable image quality with a dose that is lower than published guidelines. There are some areas of the study that could be improved. These include using a wider range of kVp and mAs to give an exact set of parameters to use.
Conclusion: Additional filtration has been identified as amajor tool for reducing effective dose whilst maintaining acceptable image quality in a 5 year old phantom.
Original languageEnglish
Title of host publicationOPTIMAX 2014 – radiation dose and image quality optimisation in medical imaging
Place of PublicationLisbon, Portugal
Pages85
Number of pages91
Publication statusPublished - 2015
EventOPTIMAX 2014: radiation dose and image quality optimisation in medical imaging - Lisbon , Portugal
Duration: 1 Aug 201431 Aug 2014

Seminar

SeminarOPTIMAX 2014
CountryPortugal
CityLisbon
Period1/08/1431/08/14

Keywords

  • paediatric pelvis
  • additional filters
  • low kVp, mAs
  • dose
  • computerradiografie

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    Huizinga, E., Schaake, W., Visser, R., Bloomfield, C., Boavida, F., Chabloz, D., Crausaz, E., Hustveit, H., Knight, H., Pereira, A., & Harsaker, V. (2015). Experimental article – Reducing effective dose to a paediatric phantom by using different combinations of kVp, mAs and additional filtration whilst maintaining image quality. In OPTIMAX 2014 – radiation dose and image quality optimisation in medical imaging (pp. 85).