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CT Colonography Reporting and Data System (C-RADS): benchmark values from a clinical screening program.

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  • 11 All authors: Department of Radiology, University of Wisconsin School of Medicine and Public Health, E3/311 Clinical Science Center, 600 Highland Ave, Madison, WI 53792-3252.

AJR. American Journal of Roentgenology
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This study establishes baseline CT Colonography Reporting and Data System (C-RADS) values for screening, revealing that 14.3% of participants had positive findings, more common in men and older adults.

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Area of Science:

  • Radiology
  • Gastroenterology
  • Medical Imaging

Background:

  • CT colonography (CTC) is a key screening tool.
  • The CT Colonography Reporting and Data System (C-RADS) standardizes reporting.
  • Limited benchmark data exists for CTC screening performance.

Purpose of the Study:

  • To establish baseline C-RADS values for CTC screening.
  • To provide benchmark data for clinical performance in CTC screening.
  • To inform quality assurance measures in CTC screening programs.

Main Methods:

  • Prospective analysis of 6769 asymptomatic adults undergoing first-time CTC screening (2005-2011).
  • Classification of CTC results using C-RADS for colorectal and extracolonic findings.
  • Analysis of C-RADS classification rates and outcomes for positive findings.

Main Results:

  • Colorectal C-RADS classification: C1 (85.0%), C2 (8.6%), C3 (5.2%), C4 (0.6%).
  • Overall positive findings (C2-C4): 14.3%, higher in men (17.5%) and older adults (21.8% in 65-79 age group).
  • Extracolonic findings: E1/E2 (86.6%), E3 (11.3%), E4 (2.1%), with increased E3/E4 rates in older and female cohorts.

Conclusions:

  • The established C-RADS values provide initial benchmarks for CTC screening.
  • These benchmarks can be used for program comparison and quality assurance.
  • Findings highlight demographic differences in positive CTC screening results.