Ultra-low-dose chest CT with iterative reconstruction does not alter anatomical image quality.

Autor: Macri F; Department of radiology, university hospital of Nîmes, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France; Research team EA 2415, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France; Department of emergency radiology, 'Sapienza' university-hospital Um-berto I, 155, viale del Policlinico, 00161 Rome, Italy. Electronic address: francesco.macri@chu-nimes.fr., Greffier J; Department of radiology, university hospital of Nîmes, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France; Research team EA 2415, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France., Pereira FR; Department of radiology, university hospital of Nîmes, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France; Research team EA 2415, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France., Mandoul C; Department of radiology, university hospital of Nîmes, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France; Research team EA 2415, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France., Khasanova E; Department of radiology, university hospital of Nîmes, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France; Research team EA 2415, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France., Gualdi G; Department of emergency radiology, 'Sapienza' university-hospital Um-berto I, 155, viale del Policlinico, 00161 Rome, Italy., Beregi JP; Department of radiology, university hospital of Nîmes, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France; Research team EA 2415, 4, rue du Professeur Robert-Debré, 30029 Nîmes, France.
Jazyk: angličtina
Zdroj: Diagnostic and interventional imaging [Diagn Interv Imaging] 2016 Nov; Vol. 97 (11), pp. 1131-1140. Date of Electronic Publication: 2016 Jul 20.
DOI: 10.1016/j.diii.2016.06.009
Abstrakt: Purpose: To evaluate the effect of dose reduction with iterative reconstruction (IR) on image quality of chest CT scan.
Materials and Methods: Eighteen human cadavers had chest CT with one reference CT protocol (RP-CT; 120kVp/200mAs) and two protocols with dose reduction: low-dose-CT (LD-CT; 120kVp/40mAs) and ultra-low-dose CT (ULD-CT; 120kVp/10mAs). Data were reconstructed with filter-back-projection (FBP) for RP-CT and with FBP and IR (sinogram affirmed iterative reconstruction [SAFIRE ® ]) algorithm for LD-CT and ULD-CT. Volume CT dose index (CTDIvol) were recorded. The signal-to-noise (SNR), contrast-to-noise (CNR) ratios of LD-CT and ULD-CT and quantitative parameters were compared to RP-CT. Two radiologists reviewed the CT examinations assessed independently the quality of anatomical structures and expressed a confidence level using a 2-point scale (50% and 95%).
Results: CTDIvol was 2.69 mGy for LD-CT (-80%; P<0.01) and 0.67 mGy for ULD-CT (-95%; P<0.01) as compared to 13.42 mGy for RP-CT. SNR and CNR were significantly decreased (P<0.01) for LD-CT and ULD-CT, but IR improved these values satisfactorily. No significant differences were observed for quantitative measurements. Radiologists rated excellent/good the RP-CT and LD-CT images, whereas good/fair the ULD-CT images. Confidence level for subjective anatomical analysis was 95% for all protocols.
Conclusions: Dose reduction with a dose lower than 1 mGy, used in conjunction with IR allows performing chest CT examinations that provide a high quality of anatomical structures.
(Copyright © 2016 Editions françaises de radiologie. Published by Elsevier Masson SAS. All rights reserved.)
Databáze: MEDLINE
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