Effect of Matrix Size and Acquisition Mode on Image Quality and Radiation Dose of Ultra-High-Resolution CT of the Temporal Bone: An Anatomical Study.

Autor:	Puel U; Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France.; Université de Lorraine, INSERM, IADI, Nancy, France.; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France., Eliezer M; Department of Radiology, Lariboisière Hospital, Paris, France., Boubaker F; Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France., Villani N; Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France., Assabah B; Department of Anatomy, Université de Lorraine, Nancy, France., Hossu G; Université de Lorraine, INSERM, IADI, Nancy, France.; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France., Gondim Teixeira PA; Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France.; Université de Lorraine, INSERM, IADI, Nancy, France.; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France., Blum A; Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France.; Université de Lorraine, INSERM, IADI, Nancy, France.; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France., Parietti-Winkler C; ENT Surgery Department, Central Hospital, University Hospital Center of Nancy, Nancy, France., Gillet R; Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France.; Université de Lorraine, INSERM, IADI, Nancy, France.; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France.
Jazyk:	angličtina
Zdroj:	Canadian Association of Radiologists journal = Journal l'Association canadienne des radiologistes [Can Assoc Radiol J] 2024 Aug; Vol. 75 (3), pp. 609-619. Date of Electronic Publication: 2024 Mar 03.
DOI:	10.1177/08465371241234795
Abstrakt:	Purpose: To compare image quality and radiation exposure between super- and ultra-high-resolution helical and super-high-resolution volumetric CT of the temporal bone. Methods: Six cadaveric temporal bone specimens were used to evaluate key temporal bone structures using the following CT reconstruction and acquisition modes: helical and single-volume acquisition modes in super-high resolution (0.25-mm slice thickness, 1024 2 matrix), and helical mode in ultra-high resolution (0.25-mm slice thickness, 2048 2 matrix). Two observers performed 5 previously described preoperative measurements, measured noise and signal-to-noise ratios for air, and noise for bone, and rated the visualization of 5 anatomical structures on a 4-point scale, for each reconstruction mode. Radiation dose exposure was recorded for each examination. Results: There was no significant difference between any of the quantitative or qualitative measurements in any of the reconstruction and acquisition modes. There was a slight increase in noise and a decrease in signal-to-noise ratio in the air using the single-volume mode (115 ± 13.1 HU and 8.37 ± 0.91, respectively) compared to the helicoidal super-high-resolution (92.4 ± 11.8 HU and 10.8 ± 1.26, respectively) and helicoidal ultra-high-resolution (91.1 ± 10.7 HU and 10.9 ± 1.39, respectively) modes ( P < .002). The volumic CT dose index was 50.9 mGy with helical acquisition and 29.8 mGy with single-volume acquisition mode ( P < .0001). Conclusion: The single-volume super-high-resolution acquisition mode allows a reduction in radiation dose exposure without compromising image quality compared to helical scanning, but with a slightly lower signal-to-noise ratio in air with the single-volume mode, while there was no difference in image quality between the helical super- and ultra-high-resolution modes. Competing Interests: Declaration of Conflicting InterestsThe author(s) declared the following potential conflicts of interest with respect to the research, authorship, and/or publication of this article: Two authors in this work (A.B. and P.A.G.T.) are on a non remunerated research contract with Canon Medical Systems.
Databáze:	MEDLINE
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