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Verfasst von:Amato, Carlo [VerfasserIn]   i
 Klein, Laura [VerfasserIn]   i
 Wehrse, Eckhard [VerfasserIn]   i
 Rotkopf, Lukas Thomas [VerfasserIn]   i
 Sawall, Stefan [VerfasserIn]   i
 Maier, Joscha [VerfasserIn]   i
 Ziener, Christian H. [VerfasserIn]   i
 Schlemmer, Heinz-Peter [VerfasserIn]   i
 Kachelrieß, Marc [VerfasserIn]   i
Titel:Potential of contrast agents based on high-Z elements for contrast-enhanced photon-counting computed tomography
Verf.angabe:Carlo Amato, Laura Klein, Eckhard Wehrse, Lukas T. Rotkopf, Stefan Sawall, Joscha Maier, Christian H. Ziener and Heinz-Peter Schlemmer, Marc Kachelrieß
E-Jahr:2020
Jahr:1 November 2020
Umfang:12 S.
Illustrationen:Illustrationen
Fussnoten:Gesehen am 05.08.2024
Titel Quelle:Enthalten in: Medical physics
Ort Quelle:Hoboken, NJ : Wiley, 1974
Jahr Quelle:2020
Band/Heft Quelle:47(2020), 12, Seite 6179-6190
ISSN Quelle:2473-4209
 1522-8541
Abstract:Purpose In clinics, only iodine- and barium-based contrast agents are currently used for contrast-enhanced x-ray computed tomography (CT). Recently, the introduction of new photon-counting (PC) detectors increased the interest in developing new contrast agents based on heavier elements. These elements may provide more contrast and spectral information compared to iodine and barium thanks to their k-edges at higher energies. In this paper, the potential of high-Z elements in contrast-enhanced CT was evaluated for different patient sizes and x-ray spectra using a PC detector. Methods An adult liver phantom with five high-Z element solutions (iodine, gadolinium, ytterbium, tungsten, and bismuth) was scanned with a whole-body photon-counting computed tomography (PCCT) prototype. For each element, the contrast-to-noise ratio at unit concentration and at unit dose (CNRCD) was evaluated in low threshold images () as function of the tube voltage (80, 100, 120, and 140 kV) and in bin images (tube voltage = 120 kV) as function of the higher threshold ( and ). Simulations were performed for validation with measurements and to investigate more elements (cerium and gold), different patient sizes (infant, adult, and obese), and spectrum filtration (with and without 0.4-mm tin filter). The dose reductions associated with the CNRCD improvements over iodine were quantified as well. Results CNRCD improvements and dose reductions depend on the investigated scenario. For the infant phantom, dose reductions around 30% were reached using cerium or gadolinium in combination with the tin filter. For the adult and obese phantom, reductions around 50% were provided by gadolinium or ytterbium in combination with the tin filter. Independently of the high-Z element, the CNRCD of two optimally combined bin images was higher than the CNRCD of the low threshold image. Good agreement was found between measurements and simulations. Conclusions Between the investigated elements, gadolinium resulted to have the highest potential as novel contrast agent in PCCT, providing significant dose reductions for all patient sizes. Compared to the other elements, the implementation of gadolinium as CT contrast agent may be facilitated since it is already deployed as contrast agents for magnetic resonance imaging.
DOI:doi:10.1002/mp.14519
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: https://doi.org/10.1002/mp.14519
 kostenfrei: Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/mp.14519
 DOI: https://doi.org/10.1002/mp.14519
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:high-Z elements
 novel contrast agents
 photon-counting detectors
 x-Ray computed tomography
K10plus-PPN:1897730543
Verknüpfungen:→ Zeitschrift

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