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Related Experiment Videos

In vivo isocenter dose in two hip prosthesis patients.

W D Burleson1, C D Stutzman, J A Stitt

  • 1Department of Radiology, University of Colorado, Denver 80262.

International Journal of Radiation Oncology, Biology, Physics
|June 1, 1991
PubMed
Summary
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Hip prostheses can alter radiation doses in the pelvis. Dosimetry showed a 13% dose decrease with bilateral prostheses using conventional four-field beams, suggesting technique modifications may be needed.

Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Biomedical Engineering

Background:

  • Hip prostheses are common in patients requiring pelvic radiotherapy.
  • Metal implants can cause significant artifacts and dose perturbations in radiation treatment planning.
  • Understanding these effects is crucial for accurate dose delivery.

Purpose of the Study:

  • To investigate the impact of hip prostheses on radiation dose distribution in the prostatic urethra.
  • To compare dose variations between conventional and modified beam geometries.
  • To assess the influence of unilateral versus bilateral prostheses.

Main Methods:

  • Thermoluminescent dosimetry (TLD) measurements were performed in the prostatic urethra.
  • Measurements were conducted on two patients with varying hip prosthesis configurations (unilateral and bilateral).

Related Experiment Videos

  • Exposures utilized 24 MV photon portal beams with different field geometries.

    • Main Results:

    • A notable decrease in absorbed dose was observed with bilateral hip prostheses.
    • The dose reduction was approximately 13% specifically for conventional four-field beam geometry.
    • Unilateral prostheses and oblique four-field beam geometry showed less significant dose perturbations.

    Conclusions:

    • Hip prostheses can lead to significant irradiation dose inhomogeneities in pelvic radiotherapy.
    • Conventional four-field beam techniques are particularly susceptible to dose reduction with bilateral prostheses.
    • Modifications to beam techniques may be necessary to ensure adequate dose coverage in patients with hip prostheses.