6 March 2018 Initial evaluation of image performance of a 3-D x-ray system: phantom-based comparison of 3-D tomography with conventional computed tomography
Author Affiliations +
Abstract
Phantom-based initial performance assessment of a prototype three-dimensional (3-D) x-ray system and comparison of 3-D tomography with computed tomography (CT) were proposed. A 3-D image quality phantom was scanned with a prototype version of 3-D cone-beam CT imaging implemented on a twin robotic x-ray system using three trajectories (163 deg = table, 188 deg = upright, and 200 deg = side), six tube voltages (60, 70, 81, 90, 100, and 121 kV), and four detector doses (0.348, 0.696, 1.740, and 3.480  μGy  /  projection). CT was obtained with a clinical protocol. Spatial resolution (line pairs/cm) and soft-tissue-contrast resolution were assessed by two independent readers. Radiation dose was assessed. Descriptive and analysis of variance (ANOVA) (P  <  0.05) were performed. With 3-D tomography, a maximum of 16 lp/cm was visible and best soft-tissue-contrast resolution was 2 mm at 30 Hounsfield units (HU) for 160 projections. With CT, 10 lp/cm was visible and soft-tissue-contrast resolution was 4 mm at 20 HU. The upright trajectory yielded significantly better spatial resolution and soft tissue contrast, and the side trajectory yielded significantly higher soft tissue contrast than the table trajectory (P  <  0.05). Radiation dose was higher in 3-D tomography (45 to 704 mGycm) than CT (44 mGycm). Three-dimensional tomography renders overall equal or higher spatial resolution and comparable soft tissue contrast to CT for medium- and high-dose protocols in the side and upright trajectories, but with higher radiation doses.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Robyn Melanie Benz, Robyn Melanie Benz, Meritxell Alzamora Garcia, Meritxell Alzamora Garcia, Felix Amsler, Felix Amsler, Johannes Voigt, Johannes Voigt, Andreas Fieselmann, Andreas Fieselmann, Anna Lucja Falkowski, Anna Lucja Falkowski, Bram Stieltjes, Bram Stieltjes, Anna Hirschmann, Anna Hirschmann, } "Initial evaluation of image performance of a 3-D x-ray system: phantom-based comparison of 3-D tomography with conventional computed tomography," Journal of Medical Imaging 5(1), 015502 (6 March 2018). https://doi.org/10.1117/1.JMI.5.1.015502 . Submission: Received: 12 September 2017; Accepted: 2 February 2018
Received: 12 September 2017; Accepted: 2 February 2018; Published: 6 March 2018
JOURNAL ARTICLE
10 PAGES


SHARE
RELATED CONTENT


Back to Top