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[Pelvimetry with compute tomography].

Anne Catrine Traegde Martinsen1, Mona Risdal, Tonje Bay

  • 1Avdeling for diagnostisk fysikk og teknikk, Radiologisk divisjon, Ullevål universitetssykehus, 0407 Oslo. neti@uus.no

Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke
|August 16, 2005
PubMed
Summary

Accurate CT pelvimetry measurements are achieved when patients are positioned at the isocenter, ensuring low fetal radiation doses comparable to conventional methods. This study recommends CT pelvimetry as a replacement for traditional techniques.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Dosimetry

Background:

  • Ullevaal University Hospital introduced CT pelvimetry in 1993.
  • Ensuring accuracy and minimizing fetal radiation dose are critical for CT pelvimetry.
  • This study evaluated the precision of CT pelvimetry and measured radiation doses.

Purpose of the Study:

  • To assess the accuracy of computed tomography (CT) pelvimetry measurements.
  • To quantify the fetal dose and effective dose to the mother during CT pelvimetry.
  • To compare CT pelvimetry with conventional methods.

Main Methods:

  • A lead scalar was used to test measurement accuracy at various positions relative to the isocenter.
  • Measurements were taken using front and side scout views and compared to a real scale.

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  • Fetal and effective doses were estimated using CT dosimetry (NRPB), with fetal dose approximated as uterus dose.

    • Main Results:

    • Measurements were overestimated when the table moved away from the isocenter towards the X-ray tube.
    • Measurements were underestimated when the table moved away from the tube towards the detector.
    • Accurate measurements were obtained when the patient was positioned at the isocenter.
    • The estimated fetal dose was 0.74 mGy, and the mother's effective dose was 0.3 mSv.

    Conclusions:

    • CT pelvimetry measurements are accurate when performed with the patient at the isocenter.
    • The fetal radiation dose from CT pelvimetry is comparable to or lower than that of conventional pelvimetry.
    • CT pelvimetry is recommended as a replacement for conventional pelvimetry due to its accuracy and safety profile.