Ultra-low dose CT colonography with automatic tube current modulation and sinogram-affirmed iterative reconstruction: Effects on radiation exposure and image quality.

Autor: Cianci R; Department of Neuroscience Imaging and Clinical Sciences, University 'G. d'Annunzio', SS. Annunziata Hospital, Chieti, Italy., Delli Pizzi A; Department of Neuroscience Imaging and Clinical Sciences, University 'G. d'Annunzio', SS. Annunziata Hospital, Chieti, Italy., Esposito G; Department of Neuroscience Imaging and Clinical Sciences, University 'G. d'Annunzio', SS. Annunziata Hospital, Chieti, Italy., Timpani M; Department of Neuroscience Imaging and Clinical Sciences, University 'G. d'Annunzio', SS. Annunziata Hospital, Chieti, Italy., Tavoletta A; Department of Neuroscience Imaging and Clinical Sciences, University 'G. d'Annunzio', SS. Annunziata Hospital, Chieti, Italy., Pulsone P; Department of Neuroscience Imaging and Clinical Sciences, University 'G. d'Annunzio', SS. Annunziata Hospital, Chieti, Italy., Basilico R; Department of Neuroscience Imaging and Clinical Sciences, University 'G. d'Annunzio', SS. Annunziata Hospital, Chieti, Italy., Cotroneo AR; Department of Neuroscience Imaging and Clinical Sciences, University 'G. d'Annunzio', SS. Annunziata Hospital, Chieti, Italy., Filippone A; Department of Neuroscience Imaging and Clinical Sciences, University 'G. d'Annunzio', SS. Annunziata Hospital, Chieti, Italy.
Jazyk: angličtina
Zdroj: Journal of applied clinical medical physics [J Appl Clin Med Phys] 2019 Jan; Vol. 20 (1), pp. 321-330. Date of Electronic Publication: 2018 Dec 26.
DOI: 10.1002/acm2.12510
Abstrakt: Objective: To assess the radiation dose and image quality of ultra-low dose (ULD)-CT colonography (CTC) obtained with the combined use of automatic tube current (mAs) modulation with a quality reference mAs of 25 and sinogram-affirmed iterative reconstruction (SAFIRE), compared to low-dose (LD) CTC acquired with a quality reference mAs of 55 and reconstructed with filtered back projection (FBP).
Methods: Eighty-two patients underwent ULD-CTC acquisition in prone position and LD-CTC acquisition in supine position. Both ULD-CTC and LD-CTC protocols were compared in terms of radiation dose [weighted volume computed tomography dose index (CTDI vol ) and effective dose], image noise, image quality, and polyp detection.
Results: The mean effective dose of ULD-CTC was significantly lower than that of LD-CTC (0.98 and 2.69 mSv respectively, P < 0.0001) with an overall dose reduction of 63.2%. Image noise was comparable between ULD-CTC and LD-CTC (28.6 and 29.8 respectively, P = 0.09). There was no relevant difference when comparing image quality scores and polyp detection for both 2D and 3D images.
Conclusion: ULD-CTC allows to significantly reduce the radiation dose without meaningful image quality degradation compared to LD-CTC.
(© 2018 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine.)
Databáze: MEDLINE
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