title: Dose-efficient ultrahigh-resolution scan mode using a photon counting detector computed tomography system.
abstract: An ultrahigh-resolution (UHR) data collection mode was enabled on a whole-body, research photon counting detector (PCD) computed tomography system. In this mode, 64 rows of [Formula: see text] detector pixels were used, which corresponded to a pixel size of [Formula: see text] at the isocenter. Spatial resolution and image noise were quantitatively assessed for the UHR PCD scan mode, as well as for a commercially available UHR scan mode that uses an energy-integrating detector (EID) and a set of comb filters to decrease the effective detector size. Images of an anthropomorphic lung phantom, cadaveric swine lung, swine heart specimen, and cadaveric human temporal bone were qualitatively assessed. Nearly equivalent spatial resolution was demonstrated by the modulation transfer function measurements: 15.3 and [Formula: see text] spatial frequencies were achieved at 10% and 2% modulation, respectively, for the PCD system and 14.2 and [Formula: see text] for the EID system. Noise was 29% lower in the PCD UHR images compared to the EID UHR images, representing a potential dose savings of 50% for equivalent image noise. PCD UHR images from the anthropomorphic phantom and cadaveric specimens showed clear delineation of small structures.
authors.affiliation: Mayo Clinic , Department of Radiology, 200 First Street Southwest, Rochester, Minnesota 55905, United States.
authors.forename: Shuai
authors.initials: S
authors.lastname: Leng
authors.affiliation: Mayo Clinic , Department of Radiology, 200 First Street Southwest, Rochester, Minnesota 55905, United States.
authors.forename: Zhicong
authors.initials: Z
authors.lastname: Yu
authors.affiliation: Siemens Healthcare , Malvern, Pennsylvania 19355, United States.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Halaweish
authors.affiliation: Siemens Healthcare , GmbH, Siemensstraße 3, Forchheim 91301, Germany.
authors.forename: Steffen
authors.initials: S
authors.lastname: Kappler
authors.affiliation: Siemens Healthcare , GmbH, Siemensstraße 3, Forchheim 91301, Germany.
authors.forename: Katharina
authors.initials: K
authors.lastname: Hahn
authors.affiliation: Siemens Healthcare , GmbH, Siemensstraße 3, Forchheim 91301, Germany.
authors.forename: Andre
authors.initials: A
authors.lastname: Henning
authors.affiliation: Mayo Clinic , Department of Radiology, 200 First Street Southwest, Rochester, Minnesota 55905, United States.
authors.forename: Zhoubo
authors.initials: Z
authors.lastname: Li
authors.affiliation: Mayo Clinic , Department of Radiology, 200 First Street Southwest, Rochester, Minnesota 55905, United States.
authors.forename: John
authors.initials: J
authors.lastname: Lane
authors.affiliation: Mayo Clinic , Department of Radiology, 200 First Street Southwest, Rochester, Minnesota 55905, United States.
authors.forename: David L
authors.initials: DL
authors.lastname: Levin
authors.affiliation: Mayo Clinic , Department of Physiology and Biomedical Engineering, 200 First Street Southwest, Rochester, Minnesota 55905, United States.
authors.forename: Steven
authors.initials: S
authors.lastname: Jorgensen
authors.affiliation: Mayo Clinic , Department of Physiology and Biomedical Engineering, 200 First Street Southwest, Rochester, Minnesota 55905, United States.
authors.forename: Erik
authors.initials: E
authors.lastname: Ritman
authors.affiliation: Mayo Clinic , Department of Radiology, 200 First Street Southwest, Rochester, Minnesota 55905, United States.
authors.forename: Cynthia
authors.initials: C
authors.lastname: McCollough
keywords: computed tomography; high-resolution mode; photon counting detector; spatial resolution