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Related Concept Videos

Region of Convergence of Laplace Tarnsform01:20

Region of Convergence of Laplace Tarnsform

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The Region of Convergence (ROC) is a fundamental concept in signal processing and system analysis, particularly associated with the Laplace transform. The ROC represents an area in the complex plane where the Laplace transform of a given signal converges, determining the transform's applicability and utility.
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Updated: Jul 18, 2025

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Collapsed Cone Superposition Algorithm Validation for Chest Wall Tangential Fields using Virtual Wedge Filters.

Ahad Zeinali1, Mikaeil Molazadeh2, Samaneh Ganjgahi1

  • 1Department of Medical Physics, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran.

Journal of Medical Signals and Sensors
|August 25, 2023
PubMed
Summary
This summary is machine-generated.

Virtual wedge (VW) radiotherapy ensures uniform dose distribution. This study validates the collapsed cone superposition (CCS) algorithm

Keywords:
Film dosimetrygamma indextreatment planning systemvirtual wedge

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Virtual wedge (VW) is crucial in radiotherapy for uniform dose distribution, especially in postmastectomy chest wall treatments.
  • Accurate dose calculation is vital for quality assurance of treatment planning systems (TPSs).
  • TECDOC-1583 and technical reports series no. 430 emphasize the need for evaluating dose calculation accuracy.

Purpose of the Study:

  • To evaluate the dose calculation accuracy of the collapsed cone superposition (CCS) algorithm in virtual wedge (VW) fields for postmastectomy radiotherapy of the breast cancer chest wall.
  • To compare calculated and measured doses in a heterogeneous phantom using the ISOgray TPS.

Main Methods:

  • Two tangential fields with virtual wedge (VW) angles were planned in a thorax phantom using the ISOgray TPS.
  • The collapsed cone superposition (CCS) algorithm was employed for dose calculation with 6 and 15 MV photon beams.
  • Dose distributions were evaluated using the gamma index, comparing EBT3 film measurements with TPS calculations.

Main Results:

  • Calculated and measured doses in a heterogeneous medium using VW showed good agreement (88.0%-93.4% acceptance rate).
  • Dose calculations were not significantly affected by variations in wedge angles.
  • The ISOgray TPS demonstrated overestimation of soft tissue dose and underestimation of lung dose.

Conclusions:

  • The collapsed cone superposition (CCS) algorithm, when used with the virtual wedge (VW) model in a heterogeneous environment, provides dose distributions within acceptable limits.
  • Gamma index analysis confirmed the clinical acceptability of the CCS algorithm for this application.