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Updated: Jun 17, 2026

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Longitudinal study using a diode phantom for helical tomotherapy IMRT QA.

M Geurts1, J Gonzalez, P Serrano-Ojeda

  • 1Caribbean Radiation Oncology Center, P.O. Box 958, Bayamon, Puerto Rico 00959, Puerto Rico. mgeurts@adioscancer.com

Medical Physics
|December 10, 2009
PubMed
Summary
This summary is machine-generated.

The DELTA4 phantom accurately verifies helical tomotherapy IMRT QA, showing close agreement with ionization chambers and passing all plans with a 3%/3 mm gamma index. This confirms the phantom

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Quality Assurance

Background:

  • Helical tomotherapy is an advanced radiotherapy technique.
  • Intensity-modulated radiation therapy (IMRT) requires precise dose delivery.
  • Quality assurance (QA) is critical for safe and effective IMRT.

Purpose of the Study:

  • To validate the DELTA4 diode phantom for helical tomotherapy IMRT QA.
  • To present results from the first 264 clinical cases using the DELTA4 phantom.

Main Methods:

  • Compared DELTA4 phantom results with ionization chamber and Gafchromic film measurements.
  • Conducted a longitudinal study analyzing IMRT QA against machine QA procedures.

Main Results:

  • Maximum difference of 0.7% between DELTA4 and ionization chamber in low dose-gradient regions.
  • All IMRT QA plans passed a 3%/3 mm gamma specification.
  • Mean 90% isodose absolute difference was 0.05% with a 1.19% sigma.

Conclusions:

  • DELTA4 phantom measurements closely match planned dose distributions.
  • Significant correlation found between IMRT QA, daily QA, and output measurements.
  • High accuracy demonstrated for both the DELTA4 phantom and the TomoTherapy Hi-Art system.