Initial results of a new generation dual source CT system using only an in-plane comb filter for ultra-high resolution temporal bone imaging

• Verfasst von: Meyer, Mathias [VerfasserIn]
• Verfasst von: Haubenreisser, Holger [VerfasserIn]
• Verfasst von: Schad, Lothar R. [VerfasserIn]
• Verfasst von: Schönberg, Stefan [VerfasserIn]
• Verfasst von: Henzler, Thomas [VerfasserIn]
• Titel: Initial results of a new generation dual source CT system using only an in-plane comb filter for ultra-high resolution temporal bone imaging
• Verf.angabe: Mathias Meyer, Holger Haubenreisser, Rainer Raupach, Bernhard Schmidt, Florian Lietzmann, Christianne Leidecker, Thomas Allmendinger, Thomas Flohr, Lothar R. Schad, Stefan O. Schoenberg, Thomas Henzler
• E-Jahr: 2015
• Jahr: 8 September 2014
• Jahr des Originals: 2014
• Umfang: 8 S.
• Fussnoten: Gesehen am: 11.08.2017
• Titel Quelle: Enthalten in: European radiology
• Ort Quelle: Berlin : Springer, 1991
• Jahr Quelle: 2015
• Band/Heft Quelle: 25(2015), 1, Seite 178-185
• ISSN Quelle: 1432-1084
• ISSN Quelle: 1613-3757
• DOI: doi:10.1007/s00330-014-3406-4
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1562365053

Abstract

Objectives: To prospectively evaluate radiation dose and image quality of a third generation dual-source CT (DSCT) without z-axis filter behind the patient for temporal bone CT. Methods: Forty-five patients were either examined on a first, second, or third generation DSCT in an ultra-high-resolution (UHR) temporal bone-imaging mode. On the third generation DSCT system, the tighter focal spot of 0.2 mm2 removesthe necessity for an additional z-axis-filter, leading to an improved z-axis radiation dose efficiency. Images of 0.4 mm were reconstructed using standard filtered-back-projection or iterative reconstruction (IR) technique for previous generations of DSCT and a novel IR algorithm for the third generation DSCT. Radiation dose and image quality were compared between the three DSCT systems. Results: The statistically significantly highest subjective and objective image quality was evaluated for the third generation DSCT when compared to the first or second generation DSCT systems (all p < 0.05). Total effective dose was 63 %/39 % lower for the third generation examination as compared to the first and second generation DSCT. Conclusions: Temporal bone imaging without z-axis-UHR-filter and a novel third generation IR algorithm allows for significantly higher image quality while lowering effective dose when compared to the first two generations of DSCTs.