Physics of Medical Imaging

Dose-efficient ultrahigh-resolution scan mode using a photon counting detector computed tomography system

[+] Author Affiliations
Shuai Leng, Zhicong Yu, Zhoubo Li, John Lane, David L. Levin, Cynthia McCollough

Mayo Clinic, Department of Radiology, 200 First Street Southwest, Rochester, Minnesota 55905, United States

Ahmed Halaweish

Siemens Healthcare, Malvern, Pennsylvania 19355, United States

Steffen Kappler, Katharina Hahn, Andre Henning

Siemens Healthcare, GmbH, Siemensstraße 3, Forchheim 91301, Germany

Steven Jorgensen, Erik Ritman

Mayo Clinic, Department of Physiology and Biomedical Engineering, 200 First Street Southwest, Rochester, Minnesota 55905, United States

J. Med. Imag. 3(4), 043504 (Dec 22, 2016). doi:10.1117/1.JMI.3.4.043504
History: Received April 12, 2016; Accepted November 28, 2016
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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 0.45  mm×0.45  mm detector pixels were used, which corresponded to a pixel size of 0.25  mm×0.25  mm 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 20.3  lp/cm spatial frequencies were achieved at 10% and 2% modulation, respectively, for the PCD system and 14.2 and 18.6  lp/cm 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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Shuai Leng ; Zhicong Yu ; Ahmed Halaweish ; Steffen Kappler ; Katharina Hahn, et al.
"Dose-efficient ultrahigh-resolution scan mode using a photon counting detector computed tomography system", J. Med. Imag. 3(4), 043504 (Dec 22, 2016). ; http://dx.doi.org/10.1117/1.JMI.3.4.043504


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