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Area of Science:

  • Radiology
  • Medical Imaging

Background:

  • Virtual colonoscopy using multidetector CT (MDCT) is an established method for colorectal cancer screening.
  • Dual-energy (DE) CT technology offers potential advantages in tissue characterization and artifact reduction.

Purpose of the Study:

  • To describe the technique of DE MDCT colonoscopy.
  • To assess the feasibility of DE MDCT colonoscopy.

Main Methods:

  • Eight patients underwent DE CT colonoscopy using a DE scan protocol and dose modulation software.
  • Analysis involved dedicated DE software, acquiring prone non-contrast and DE supine post-contrast images.

Main Results:

  • DE MDCT colonoscopy achieved an 87.5% technical success rate, with successful imaging in 7 out of 8 patients.
  • Virtual unenhanced and iodine map images were generated, aiding in differentiating lesions from stool and identifying enhancing rectal cancer.
  • A key advantage was the absence of misregistration artifacts.

Conclusions:

  • DE MDCT colonoscopy is technically feasible and may eliminate the need for unenhanced prone imaging.
  • Non-cathartic DE CT colonoscopy might be possible.
  • Limitations include a limited field of view and the need to optimize dose to reduce pelvic streak artifacts.