Experimental article Maintaining image quality for paediatric chest CTs while lowering dose: FBP versus SAFIRE
Borge, Synnøve Devik; Campbell, Nina; Gomes, Ana; Raszkowski, Aysha Malgorzata; Rook, Jan Willem; Sanderud, Audun; Vallinga, Anique; Vouillamoz, Audrey; Buissink, Carst
Peer reviewed, Chapter
Attribution- non commercial- share alike c c b y- n c- s a
Permanent lenke
https://hdl.handle.net/10642/3012Utgivelsesdato
2015Metadata
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Originalversjon
http://hdl.handle.net/10400.21/4541Sammendrag
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.