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Field Placement Correction Using MV IGRT. Is Postintervention Imaging Necessary?

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Daily online image-guided radiation therapy (IGRT) reduces setup errors but requires postintervention imaging for manual corrections. The current dose burden for IGRT is excessive and can be reduced.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Technology

Background:

  • Online image-guided radiation therapy (IGRT) is standard for radical pelvic patients.
  • A linear accelerator with megavoltage electronic portal imaging introduces a dose burden.
  • This dose burden is complicated by postintervention imaging for field placement verification.

Purpose of the Study:

  • To analyze setup errors and isocenter shifts in IGRT.
  • To determine an appropriate dose burden for daily imaging.
  • To evaluate the necessity of postintervention imaging.

Main Methods:

  • Retrospective analysis of IGRT data from 50 radical pelvic patients.
  • Assessment of isocenter moves and statistical analysis of pre- and postintervention errors.
  • Investigation of imaging dose and manual isocenter shift errors.

Main Results:

  • Online IGRT effectively reduced setup errors to under 2 mm in all planes.
  • Postintervention imaging proved necessary due to manual field placement errors.
  • The existing generic dose burden was found to be excessive.

Conclusions:

  • Daily IGRT is crucial in modern radiation therapy.
  • Postintervention imaging is essential for manual isocenter placement verification.
  • The estimated dose burden can be reduced using a population dose or realistic maximum dose.