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Related Concept Videos

Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...

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Related Experiment Video

Updated: Jun 8, 2026

Construction of a Preclinical Multimodality Phantom Using Tissue-mimicking Materials for Quality Assurance in Tumor Size Measurement
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The Swiss IMRT dosimetry intercomparison using a thorax phantom.

H Schiefer1, A Fogliata, G Nicolini

  • 1Klinik für Radio-Onkologie, Kantonsspital St. Gallen, Switzerland. johann.schiefer@kssg.ch

Medical Physics
|October 1, 2010
PubMed
Summary
This summary is machine-generated.

A Swiss national intensity modulated radiation therapy (IMRT) dosimetry intercomparison confirmed the accuracy of treatment planning and dose calculation algorithms. Type b algorithms showed better agreement in lung tissue compared to type a.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Intensity modulated radiation therapy (IMRT) is a complex cancer treatment requiring precise dosimetry.
  • Ensuring accuracy in IMRT treatment planning, dose calculation, and delivery is critical for patient outcomes.
  • A national dosimetry intercomparison provides a standardized method for quality assurance in radiation oncology.

Purpose of the Study:

  • To assess the accuracy of the IMRT treatment chain, including planning, dose calculation, and irradiation.
  • To evaluate the performance of different dose calculation algorithms (type a and type b) in a clinical context.
  • To establish a feasible and repeatable dosimetry intercomparison for Swiss radiation oncology institutions.

Main Methods:

  • A national IMRT dosimetry intercomparison was conducted across 23 Swiss institutions in 2008.
  • A thorax phantom with inhomogeneities was used for thermoluminescence dosimeter (TLD) and ionization chamber measurements.
  • Absolute dosimetry of applied beams was checked, and results were analyzed based on dose calculation algorithm types (a and b).

Main Results:

  • Absolute dosimetry checks showed excellent agreement between measurements and calculations (ratios close to 1.0).
  • Type b dose calculation algorithms demonstrated significantly better agreement with measurements in lung tissue compared to type a algorithms (p <0.001).
  • In non-lung regions, both algorithm types showed similar accuracy, with small absolute differences between measured and calculated doses.

Conclusions:

  • The dosimetry intercomparison is a feasible method for quality assurance in IMRT.
  • Both type a and type b algorithms exhibit acceptable accuracy in water-equivalent and low-density environments.
  • Regular IMRT dosimetry intercomparisons are planned for all Swiss institutions utilizing IMRT techniques.