Experimental article – Maintaining image quality for paediatric chest CTs while lowering dose: FBP versus SAFIRE

Synnøve Borgea, Nina Campbell, Ana Gomes, Aysha M. Raszkowskia, Jan Willem Rook, Audun Sanderud, Anique Vallinga, Carst Buissink, Audrey Vouillamoze

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

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Abstract

Objectives: Children have a greater risk from radiation, per unit dose, due to increased radiosensitivity and longer life expectancies. It is of paramount importance to reduce the radiation dose received by children.
This research concerns chest CT examinations on paediatric patients. The purpose of this study was to compare the image quality and the dose received from imaging with images reconstructed with filtered back projection (FBP) and five strengths of Sinogram-Affirmed Iterative Reconstruction (SAFIRE).
Methods: Using a multi-slice CT scanner, six series of images were taken of a paediatric phantom. Two kVp values (80 and 110), 3 mAs values (25, 50 and 100) and 2 slice thicknesses (1 mm and 3 mm) were used. All images were reconstructed with FBP and five strengths of SAFIRE. Ten observers evaluated
visual image quality. Dose was measured using CT-Expo.
Results: FBP required a higher dose than all SAFIRE strengths to obtain the same image quality for sharpness and noise. For sharpness and contrast image quality ratings of 4, FBP required doses of 6.4 and 6.8 mSv respectively. SAFIRE 5 required doses of 3.4 and 4.3 mSv respectively. Clinical acceptance rate was improved by the higher voltage (110 kV) for all images in comparison to 80 kV, which required a higher dose for acceptable image quality. 3 mm images were typically better quality than 1 mm images.
Conclusion: SAFIRE 5 was optimal for dose reduction and image quality
Original languageEnglish
Title of host publicationOPTIMAX 2014: radiation dose and image quality optimisation in medical imaging
Pages16-20
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

  • safire
  • chest radiation risk dose reduction
  • ct
  • image quality
  • dose reduction
  • fbp
  • paediatric patients

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    Borgea, S., Campbell, N., Gomes, A., Raszkowskia, A. M., Rook, J. W., Sanderud, A., Vallinga, A., Buissink, C., & Vouillamoze, A. (2015). Experimental article – Maintaining image quality for paediatric chest CTs while lowering dose: FBP versus SAFIRE. In OPTIMAX 2014: radiation dose and image quality optimisation in medical imaging (pp. 16-20)