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Related Experiment Videos

Improvement in CT pelvimetry.

E J Wiesen1, J R Crass, E M Bellon

  • 1Department of Radiology, MetroHealth Medical Center, Case Western Reserve University, Cleveland, OH 44109.

Radiology
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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Computed tomographic (CT) digital radiography for pelvimetry can cause measurement errors due to geometric distortion. A correction method is presented, and a dose reduction is possible using posteroanterior imaging.

Area of Science:

  • Radiology
  • Medical Imaging
  • Pelvic Anatomy

Background:

  • Computed tomographic (CT) digital radiography is utilized for pelvimetry.
  • Potential for measurement error exists due to geometric distortion in CT digital radiographs.

Purpose of the Study:

  • To quantify the magnitude of geometric distortion error in CT digital pelvimetry.
  • To present a general method for correcting measurement errors in transverse pelvic inlet dimensions.
  • To evaluate the feasibility of dose reduction through patient positioning.

Main Methods:

  • Measurement of geometric distortion error on two CT scanners.
  • Development and application of a general correction method for transverse pelvic inlet measurements.
  • Comparison of radiation dose between posteroanterior (PA) and anteroposterior (AP) projections.

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Main Results:

  • Geometric distortion in the lateral direction of CT digital radiographs can lead to significant measurement errors.
  • A general method for correcting these errors was successfully developed and tested.
  • Imaging in the posteroanterior projection allows for additional radiation dose reduction compared to the anteroposterior projection.

Conclusions:

  • CT digital pelvimetry is susceptible to measurement errors from geometric distortion.
  • A practical method exists to correct for these errors, improving accuracy.
  • Posteroanterior imaging offers a strategy for reducing patient radiation exposure during pelvimetry.