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Updated: Apr 15, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Integral dose: Comparison between four techniques for prostate radiotherapy.

Krzysztof Ślosarek1, Wojciech Osewski2, Aleksandra Grządziel1

  • 1MSC Memorial Cancer Center and Institute of Oncology Gliwice Branch, Department of Radiotherapy and Brachytherapy Planning, ul. Wybrzeża Armii Krajowej 15, 44-101 Gliwice, Poland.

Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology
|April 11, 2015
PubMed
Summary

Intensity Modulated Radiation Therapy (IMRT) techniques like VMAT deliver lower whole-body radiation doses in prostate cancer treatment compared to CyberKnife and TomoTherapy, reducing healthy tissue exposure.

Keywords:
CyberKnifeIntegral doseProstate cancerTomoTherapyVMAT

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Prostate Cancer Therapy

Background:

  • Multifield radiotherapy techniques can deliver significant low-dose volumes within the patient's body.
  • Dose exposure beyond the target volume may contribute to cellular injury.
  • Investigating dose absorption across different radiotherapy methods is crucial for patient safety.

Purpose of the Study:

  • To compare the integral dose delivered to the prostate planning target volume (PTV) and the entire patient body across various radiotherapy techniques.
  • To determine if specific radiotherapy methods offer reduced integral dose exposure to the patient.

Main Methods:

  • Analysis of CyberKnife treatment plans for 10 localized prostate cancer patients.
  • Calculation of alternative plans using Volumetric Modulated Arc Therapy (VMAT), Intensity Modulated Radiation Therapy (IMRT), and TomoTherapy for equivalent PTV coverage.
  • Application of the Integral Dose formula to quantify dose to PTV and whole body.

Main Results:

  • All techniques delivered comparable doses to the treated planning target volume.
  • Significant differences in mean integral dose to the whole patient body were observed among techniques.
  • TomoTherapy and CyberKnife resulted in the highest integral doses, while VMAT exhibited the lowest.

Conclusions:

  • Robotic radiosurgery (CyberKnife) and TomoTherapy deliver higher total doses to normal tissues.
  • Integral dose to healthy tissues is a key dosimetric factor distinguishing between radiotherapy delivery methods.
  • VMAT demonstrates potential for minimizing integral dose in prostate cancer radiotherapy.