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Related Concept Videos

Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...

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Updated: Jun 22, 2026

Four-Dimensional Computed Tomography-Guided Valve Sizing for Transcatheter Pulmonary Valve Replacement
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Three-dimensional pelvimetry by computed tomography.

M Lenhard1, T Johnson, S Weckbach

  • 1Department of Obstetrics and Gynecology, Ludwig-Maximilians-University Munich, Campus Grosshadern, Munich, Germany. Miriam.Lenhard@med.uni-muenchen.de

La Radiologia Medica
|June 25, 2009
PubMed
Summary
This summary is machine-generated.

Computed tomography (CT) pelvimetry using 3D volume-rendered reconstructions shows high agreement and low variability for pelvic measurements. This technique accurately assesses pelvic anatomy for retrospective dystocia studies.

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Area of Science:

  • Radiology and Medical Imaging
  • Obstetrics and Gynecology
  • Anatomy

Background:

  • Accurate assessment of pelvic dimensions is crucial for understanding childbirth complications.
  • Computed tomography (CT) offers detailed anatomical visualization, but its utility in pelvimetry requires evaluation.
  • Different postprocessing techniques may influence the reliability of CT-based pelvic measurements.

Purpose of the Study:

  • To evaluate the agreement and variability of computed tomography (CT) pelvimetry using various postprocessing methods.
  • To determine the optimal CT postprocessing technique for reliable pelvic dimension measurements.

Main Methods:

  • Retrospective analysis of CT data from 25 patients.
  • Six pelvimetric measurements were performed by two independent observers using four different postprocessing techniques: biplanar topograms, 1-mm slice multiplanar reconstructions, and 3D volume-rendered images from 1-mm and 5-mm slices.
  • Interobserver agreement and variability were assessed using Bland-Altman analysis; a scanned human skeleton served as a reference.

Main Results:

  • Three-dimensional (3D) volume-rendered images from 1-mm slices demonstrated the highest interobserver agreement (correlation coefficient 0.98).
  • Excellent interobserver agreement (0.96-0.99) was observed for sagittal outlet and midpelvic diameter, transverse inlet diameter, and obstetric conjugate.
  • CT and ruler measurements of a reference skeleton showed excellent agreement, validating the CT measurement accuracy.

Conclusions:

  • Three-dimensional (3D) volume-rendered CT reconstructions provide pelvimetry with low interobserver variability.
  • CT pelvimetry is a reliable method for obtaining precise pelvic anatomical information.
  • This technique is suitable for identifying parameters relevant to dystocia in retrospective studies.