Comparison of angular and combined automatic tube current modulation techniques with constant tube current CT of the abdomen and pelvis

AJR Am J Roentgenol. 2006 Mar;186(3):673-9. doi: 10.2214/AJR.04.1513.


Objective: The objective of our study was to compare image quality and radiation dose associated with abdominopelvic CT using combined modulation, angular modulation, and constant tube current.

Conclusion: Compared with using a constant tube current to scan the abdomen and pelvis, the use of a combined modulation technique results in a substantial reduction (42-44%) in radiation dose with acceptable image noise and diagnostic acceptability.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Contrast Media
  • Female
  • Humans
  • Male
  • Middle Aged
  • Radiation Dosage
  • Radiography, Abdominal / instrumentation*
  • Statistics, Nonparametric
  • Tomography Scanners, X-Ray Computed*


  • Contrast Media