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Title: A dual cone-beam CT system for image guided radiotherapy: Initial performance characterization

Abstract

Purpose: The purpose of this study is to evaluate the performance of a recently developed benchtop dual cone-beam computed tomography (CBCT) system with two orthogonally placed tube/detector sets. Methods: The benchtop dual CBCT system consists of two orthogonally placed 40 Multiplication-Sign 30 cm flat-panel detectors and two conventional x-ray tubes with two individual high-voltage generators sharing the same rotational axis. The x-ray source to detector distance is 150 cm and x-ray source to rotational axis distance is 100 cm for both subsystems. The objects are scanned through 200 Degree-Sign of rotation. The dual CBCT system utilized 110 Degree-Sign of projection data from one detector and 90 Degree-Sign from the other while the two individual single CBCTs utilized 200 Degree-Sign data from each detector. The system performance was characterized in terms of uniformity, contrast, spatial resolution, noise power spectrum, and CT number linearity. The uniformities, within the axial slice and along the longitudinal direction, and noise power spectrum were assessed by scanning a water bucket; the contrast and CT number linearity were measured using the Catphan phantom; and the spatial resolution was evaluated using a tungsten wire phantom. A skull phantom and a ham were also scanned to provide qualitative evaluationmore » of high- and low-contrast resolution. Each measurement was compared between dual and single CBCT systems. Results: Compared to single CBCT, the dual CBCT presented: (1) a decrease in uniformity by 1.9% in axial view and 1.1% in the longitudinal view, as averaged for four energies (80, 100, 125, and 150 kVp); (2) comparable or slightly better contrast (0{approx}25 HU) for low-contrast objects and comparable contrast for high-contrast objects; (3) comparable spatial resolution; (4) comparable CT number linearity with R{sup 2}{>=} 0.99 for all four tested energies; (5) lower noise power spectrum in magnitude. Dual CBCT images of the skull phantom and the ham demonstrated both high-contrast resolution and good soft-tissue contrast. Conclusions: The performance of a benchtop dual CBCT imaging system has been characterized and is comparable to that of a single CBCT.« less

Authors:
; ;  [1];  [2]
  1. Medical Physics Graduate Program, Duke University, Durham, North Carolina 27710 (United States)
  2. Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27710 (United States)
Publication Date:
OSTI Identifier:
22130533
Resource Type:
Journal Article
Journal Name:
Medical Physics
Additional Journal Information:
Journal Volume: 40; Journal Issue: 2; Other Information: (c) 2013 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-2405
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 62 RADIOLOGY AND NUCLEAR MEDICINE; COMPARATIVE EVALUATIONS; COMPUTERIZED TOMOGRAPHY; IMAGES; PERFORMANCE; PHANTOMS; PHOTODETECTORS; RADIOTHERAPY; ROTATION; SKULL; SPATIAL RESOLUTION; TUNGSTEN; X-RAY SOURCES; X-RAY TUBES

Citation Formats

Hao, Li, Bowsher, James, Fangfang, Yin, Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27710, and Giles, William. A dual cone-beam CT system for image guided radiotherapy: Initial performance characterization. United States: N. p., 2013. Web. doi:10.1118/1.4788654.
Hao, Li, Bowsher, James, Fangfang, Yin, Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27710, & Giles, William. A dual cone-beam CT system for image guided radiotherapy: Initial performance characterization. United States. https://doi.org/10.1118/1.4788654
Hao, Li, Bowsher, James, Fangfang, Yin, Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27710, and Giles, William. 2013. "A dual cone-beam CT system for image guided radiotherapy: Initial performance characterization". United States. https://doi.org/10.1118/1.4788654.
@article{osti_22130533,
title = {A dual cone-beam CT system for image guided radiotherapy: Initial performance characterization},
author = {Hao, Li and Bowsher, James and Fangfang, Yin and Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27710 and Giles, William},
abstractNote = {Purpose: The purpose of this study is to evaluate the performance of a recently developed benchtop dual cone-beam computed tomography (CBCT) system with two orthogonally placed tube/detector sets. Methods: The benchtop dual CBCT system consists of two orthogonally placed 40 Multiplication-Sign 30 cm flat-panel detectors and two conventional x-ray tubes with two individual high-voltage generators sharing the same rotational axis. The x-ray source to detector distance is 150 cm and x-ray source to rotational axis distance is 100 cm for both subsystems. The objects are scanned through 200 Degree-Sign of rotation. The dual CBCT system utilized 110 Degree-Sign of projection data from one detector and 90 Degree-Sign from the other while the two individual single CBCTs utilized 200 Degree-Sign data from each detector. The system performance was characterized in terms of uniformity, contrast, spatial resolution, noise power spectrum, and CT number linearity. The uniformities, within the axial slice and along the longitudinal direction, and noise power spectrum were assessed by scanning a water bucket; the contrast and CT number linearity were measured using the Catphan phantom; and the spatial resolution was evaluated using a tungsten wire phantom. A skull phantom and a ham were also scanned to provide qualitative evaluation of high- and low-contrast resolution. Each measurement was compared between dual and single CBCT systems. Results: Compared to single CBCT, the dual CBCT presented: (1) a decrease in uniformity by 1.9% in axial view and 1.1% in the longitudinal view, as averaged for four energies (80, 100, 125, and 150 kVp); (2) comparable or slightly better contrast (0{approx}25 HU) for low-contrast objects and comparable contrast for high-contrast objects; (3) comparable spatial resolution; (4) comparable CT number linearity with R{sup 2}{>=} 0.99 for all four tested energies; (5) lower noise power spectrum in magnitude. Dual CBCT images of the skull phantom and the ham demonstrated both high-contrast resolution and good soft-tissue contrast. Conclusions: The performance of a benchtop dual CBCT imaging system has been characterized and is comparable to that of a single CBCT.},
doi = {10.1118/1.4788654},
url = {https://www.osti.gov/biblio/22130533}, journal = {Medical Physics},
issn = {0094-2405},
number = 2,
volume = 40,
place = {United States},
year = {Fri Feb 15 00:00:00 EST 2013},
month = {Fri Feb 15 00:00:00 EST 2013}
}