Monoenergetic extrapolation of cardiac dual energy CT for artifact reduction

Francesco Secchi, Carlo Nicola De Cecco, James Vance Spearman, Justin Robert Silverman, Ullrich Ebersberger, Francesco Sardanelli, U. Joseph Schoepf

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Background Monoenergetic extrapolation of cardiac dual-energy computed tomography (DECT) could be useful in artifact reduction in clinical practice. Purpose To evaluate the potential of monoenergetic extrapolation of cardiac DECT data for reducing artifacts from metal and high iodine contrast concentration. Material and Methods With IRB approval and in HIPAA compliance, 35 patients (22 men, 61 ± 12 years) underwent cardiac DECT with dual-source CT (100 kVp and 140 kVp). Contrast material injection protocols were adapted to the patient's weight using non-ionic low-osmolar 370 mgI/mL iopromide. Datasets were transferred to a stand-alone workstation and dedicated monoenergetic analysis software was used for postprocessing. Reconstructions with the following five photon energies were generated: 40 keV, 60 keV, 80 keV, 100 keV, and 120 keV. Artifact severity was graded on a 5-point Likert scale (0, massive artifact; 5, absence of artifact). The size of artifact and image noise (expressed as HU) in anatomic structures adjacent to the artifact were measured. Quantitative and subjective image quality was compared using Friedman and Wilcoxon tests. Results We observed artifacts arising from densely concentrated contrast material in the superior vena cava (SVC) in 18 patients, from sternal wires in 14, from bypass clips in eight, and from coronary artery stents in seven. Artifact size in monoenergetic reconstructions from 40 to 120 keV decreased from 21.3 to 19 mm for the SVC (P <0.001), from 8.4 to 2.6 mm for sternal wires (P <0.001), from 6.4 to 2.2 mm for bypass clips (P <0.001), and from 5.9 to 2.7 mm for stents (P <0.001), respectively. The quality score changed from 0.2 to 3.8 for the SVC (P <0.001), from 0.1 to 4 for sternal wires (P <0.001), from 0 to 3.9 for bypass clips (P <0.001), and from 0 to 3.9 for stents (P <0.001). Lowest noise in adjacent structures was found at 80 keV for the SVC (39.1 HU), for sternal wires (33.3), for bypass clips (26.9), and for stents (33.9). Conclusion A significant reduction of high-attenuation artifacts can be achieved by use of higher monoenergetic energy levels with cardiac DECT. However, image noise in anatomic structures affected by artifacts is lowest at 80 keV, which suggests an evaluation approach that makes use of multiple energy levels for a complete diagnosis.

Original languageEnglish
Pages (from-to)413-418
Number of pages6
JournalActa Radiologica
Volume56
Issue number4
DOIs
Publication statusPublished - Apr 1 2015

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Artifacts
Superior Vena Cava
Surgical Instruments
Stents
Tomography
iopromide
Contrast Media
Health Insurance Portability and Accountability Act
Research Ethics Committees
Patient Compliance
Photons
Iodine
Noise
Coronary Vessels
Software
Metals
Weights and Measures
Injections

Keywords

  • artifact
  • Dual energy CT (DECT)
  • monoenergetic extrapolation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Medicine(all)

Cite this

Secchi, F., De Cecco, C. N., Spearman, J. V., Silverman, J. R., Ebersberger, U., Sardanelli, F., & Schoepf, U. J. (2015). Monoenergetic extrapolation of cardiac dual energy CT for artifact reduction. Acta Radiologica, 56(4), 413-418. https://doi.org/10.1177/0284185114527867

Monoenergetic extrapolation of cardiac dual energy CT for artifact reduction. / Secchi, Francesco; De Cecco, Carlo Nicola; Spearman, James Vance; Silverman, Justin Robert; Ebersberger, Ullrich; Sardanelli, Francesco; Schoepf, U. Joseph.

In: Acta Radiologica, Vol. 56, No. 4, 01.04.2015, p. 413-418.

Research output: Contribution to journalArticle

Secchi, F, De Cecco, CN, Spearman, JV, Silverman, JR, Ebersberger, U, Sardanelli, F & Schoepf, UJ 2015, 'Monoenergetic extrapolation of cardiac dual energy CT for artifact reduction', Acta Radiologica, vol. 56, no. 4, pp. 413-418. https://doi.org/10.1177/0284185114527867
Secchi, Francesco ; De Cecco, Carlo Nicola ; Spearman, James Vance ; Silverman, Justin Robert ; Ebersberger, Ullrich ; Sardanelli, Francesco ; Schoepf, U. Joseph. / Monoenergetic extrapolation of cardiac dual energy CT for artifact reduction. In: Acta Radiologica. 2015 ; Vol. 56, No. 4. pp. 413-418.
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N2 - Background Monoenergetic extrapolation of cardiac dual-energy computed tomography (DECT) could be useful in artifact reduction in clinical practice. Purpose To evaluate the potential of monoenergetic extrapolation of cardiac DECT data for reducing artifacts from metal and high iodine contrast concentration. Material and Methods With IRB approval and in HIPAA compliance, 35 patients (22 men, 61 ± 12 years) underwent cardiac DECT with dual-source CT (100 kVp and 140 kVp). Contrast material injection protocols were adapted to the patient's weight using non-ionic low-osmolar 370 mgI/mL iopromide. Datasets were transferred to a stand-alone workstation and dedicated monoenergetic analysis software was used for postprocessing. Reconstructions with the following five photon energies were generated: 40 keV, 60 keV, 80 keV, 100 keV, and 120 keV. Artifact severity was graded on a 5-point Likert scale (0, massive artifact; 5, absence of artifact). The size of artifact and image noise (expressed as HU) in anatomic structures adjacent to the artifact were measured. Quantitative and subjective image quality was compared using Friedman and Wilcoxon tests. Results We observed artifacts arising from densely concentrated contrast material in the superior vena cava (SVC) in 18 patients, from sternal wires in 14, from bypass clips in eight, and from coronary artery stents in seven. Artifact size in monoenergetic reconstructions from 40 to 120 keV decreased from 21.3 to 19 mm for the SVC (P <0.001), from 8.4 to 2.6 mm for sternal wires (P <0.001), from 6.4 to 2.2 mm for bypass clips (P <0.001), and from 5.9 to 2.7 mm for stents (P <0.001), respectively. The quality score changed from 0.2 to 3.8 for the SVC (P <0.001), from 0.1 to 4 for sternal wires (P <0.001), from 0 to 3.9 for bypass clips (P <0.001), and from 0 to 3.9 for stents (P <0.001). Lowest noise in adjacent structures was found at 80 keV for the SVC (39.1 HU), for sternal wires (33.3), for bypass clips (26.9), and for stents (33.9). Conclusion A significant reduction of high-attenuation artifacts can be achieved by use of higher monoenergetic energy levels with cardiac DECT. However, image noise in anatomic structures affected by artifacts is lowest at 80 keV, which suggests an evaluation approach that makes use of multiple energy levels for a complete diagnosis.

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