Optimal kVp selection for dual-energy imaging of the chest: Evaluation by task-specific observer preference tests

D. B. Williams, Jeff Siewerdsen, D. J. Tward, N. S. Paul, A. C. Dhanantwari, N. A. Shkumat, S. Richard, J. Yorkston, R. Van Metter

Research output: Contribution to journalArticle

Abstract

Human observer performance tests were conducted to identify optimal imaging techniques in dual-energy (DE) imaging of the chest with respect to a variety of visualization tasks for soft and bony tissue. Specifically, the effect of kVp selection in low- and high-energy projection pairs was investigated. DE images of an anthropomorphic chest phantom formed the basis for observer studies, decomposed from low-energy and high-energy projections in the range 60-90 kVp and 120-150 kVp, respectively, with total dose for the DE image equivalent to that of a single chest radiograph. Five expert radiologists participated in observer preference tests to evaluate differences in image quality among the DE images. For visualization of soft-tissue structures in the lung, the [60130] kVp pair provided optimal image quality, whereas [60140] kVp proved optimal for delineation of the descending aorta in the retrocardiac region. Such soft-tissue detectability tasks exhibited a strong dependence on the low-kVp selection (with 60 kVp providing maximum soft-tissue conspicuity) and a weaker dependence on the high-kVp selection (typically highest at 130-140 kVp). Qualitative examination of DE bone-only images suggests optimal bony visualization at a similar technique, viz., [60140] kVp. Observer preference was largely consistent with quantitative analysis of contrast, noise, and contrast-to-noise ratio, with subtle differences likely related to the imaging task and spatial-frequency characteristics of the noise. Observer preference tests offered practical, semiquantitative identification of optimal, task-specific imaging techniques and will provide useful guidance toward clinical implementation of high-performance DE imaging systems.

Original languageEnglish (US)
Pages (from-to)3916-3925
Number of pages10
JournalMedical Physics
Volume34
Issue number10
DOIs
StatePublished - 2007
Externally publishedYes

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Thorax
Noise
Thoracic Aorta
Bone and Bones
Lung

Keywords

  • Chest imaging
  • Dual-energy imaging
  • Flat-panel detector
  • Imaging performance
  • Imaging task
  • Lung cancer
  • Observer study
  • Preference tests
  • Technique optimization

ASJC Scopus subject areas

  • Biophysics

Cite this

Williams, D. B., Siewerdsen, J., Tward, D. J., Paul, N. S., Dhanantwari, A. C., Shkumat, N. A., ... Van Metter, R. (2007). Optimal kVp selection for dual-energy imaging of the chest: Evaluation by task-specific observer preference tests. Medical Physics, 34(10), 3916-3925. https://doi.org/10.1118/1.2776239

Optimal kVp selection for dual-energy imaging of the chest : Evaluation by task-specific observer preference tests. / Williams, D. B.; Siewerdsen, Jeff; Tward, D. J.; Paul, N. S.; Dhanantwari, A. C.; Shkumat, N. A.; Richard, S.; Yorkston, J.; Van Metter, R.

In: Medical Physics, Vol. 34, No. 10, 2007, p. 3916-3925.

Research output: Contribution to journalArticle

Williams, DB, Siewerdsen, J, Tward, DJ, Paul, NS, Dhanantwari, AC, Shkumat, NA, Richard, S, Yorkston, J & Van Metter, R 2007, 'Optimal kVp selection for dual-energy imaging of the chest: Evaluation by task-specific observer preference tests', Medical Physics, vol. 34, no. 10, pp. 3916-3925. https://doi.org/10.1118/1.2776239
Williams, D. B. ; Siewerdsen, Jeff ; Tward, D. J. ; Paul, N. S. ; Dhanantwari, A. C. ; Shkumat, N. A. ; Richard, S. ; Yorkston, J. ; Van Metter, R. / Optimal kVp selection for dual-energy imaging of the chest : Evaluation by task-specific observer preference tests. In: Medical Physics. 2007 ; Vol. 34, No. 10. pp. 3916-3925.
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