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Improved Sensitivity and Reader Confidence in CT Colonography Using Dual-Layer Spectral CT: A Phantom Study.

Markus M Obmann1, Chansik An1, Amanda Schaefer1

  • 1From the Department of Radiology and Biomedical Imaging, University of California, San Francisco, 513 Parnassus Ave, San Francisco, CA 94117 (M.M.O., C.A., A.S., Y.S., Z.J.W., B.M.Y.); and Department of Radiology, Albert Einstein College of Medicine, Montefiore Medical Center, New York, NY (J.Y.).

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This summary is machine-generated.

Dual-energy CT significantly improved polyp detection and reader confidence in CT colonography compared to conventional CT, especially with suboptimal fecal tagging. This advancement enhances diagnostic accuracy for colorectal cancer screening.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Gastroenterology

Background:

  • Limited cathartic preparations for CT colonography (CTC) with fecal tagging can compromise diagnostic accuracy due to poorly tagged stool.
  • Dual-energy CT (DECT) offers potential to improve contrast agent conspicuity, but its efficacy in CTC requires further investigation.

Purpose of the Study:

  • To evaluate whether dual-energy CT enhances polyp detection in CT colonography compared to conventional CT.
  • To assess the impact of different fecal tagging levels on polyp detection using DECT versus conventional CT in an in vitro setting.

Main Methods:

  • A colon phantom with 60 polyps was filled with simulated feces at four iodine concentrations.
  • Scans were performed using conventional 120-kVp CT and 40-keV monoenergetic DECT, with and without an outer fat ring.
  • Two independent readers assessed polyp detection and confidence; statistical analysis included generalized estimating equations and Wilcoxon signed-rank test.

Main Results:

  • Dual-energy CT demonstrated significantly higher overall polyp detection sensitivity (58.8%) than conventional CT (42.1%) (P < .001).
  • DECT also improved sensitivity in the presence of the simulated fat ring (48% vs. 31%, P < .001).
  • Reader confidence was significantly higher with DECT across all fecal tagging levels (P < .001), with substantial interrater agreement (κ = 0.74).

Conclusions:

  • Dual-energy CT significantly improves polyp detection and reader confidence in CT colonography compared to conventional 120-kVp CT.
  • DECT's benefits are particularly notable with suboptimal fecal tagging and in simulated larger body sizes.
  • These findings suggest DECT is a valuable tool for enhancing diagnostic accuracy in CT colonography.