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Radiation dose verification using real tissue phantom in modern radiotherapy techniques.

Om Prakash Gurjar1, S P Mishra2, Virendra Bhandari3

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This study used goat heads and meat as phantoms for radiotherapy dosimetry. Results show variations exceeding tolerance limits, highlighting the need for human-like phantoms in radiation therapy verification.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Accurate radiotherapy requires in vitro dosimetric verification.
  • Current commercial phantoms lack the variable densities of the human body.
  • This limits the precision of radiotherapy treatment delivery.

Purpose of the Study:

  • To verify physical dosimetry in a more realistic human body scenario.
  • To assess the accuracy of radiotherapy dose delivery using animal tissues as phantoms.

Main Methods:

  • Utilized a goat head as a 'head phantom' and goat meat as a 'tissue phantom'.
  • Performed dosimetric verification for three-dimensional conformal radiotherapy (3DCRT) and intensity-modulated radiotherapy (IMRT).
  • Compared planned and measured radiation doses.

Main Results:

  • Mean percentage dose variations for the head phantom were within tolerance (< ± 3%) but higher than with commercial phantoms.
  • Mean percentage dose variations for the tissue phantom exceeded tolerance limits for both 3DCRT and IMRT.
  • Standard deviations indicated variability in dose measurements for both phantom types.

Conclusions:

  • Preliminary results suggest current commercial phantoms may not fully represent human body complexities for dosimetry.
  • There is a critical need to develop radiation dosimetry methods and artificial phantoms that accurately mimic human internal body densities.
  • This advancement is crucial for improving the precision and safety of radiotherapy.