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Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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A novel quantification method for low-density gel dosimeter.

Hasan Ali Nedaie1, Farideh Pak2, Vahid Vaezzadeh3

  • 1Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Tehran University of Medical Sciences; Department of Radiotherapy Oncology, Cancer Research Centre, Cancer Institute; Tehran, Iran.

Journal of Cancer Research and Therapeutics
|March 9, 2018
PubMed
Summary

A new noise correction and exponential (NCEXP) fitting method improves dose quantification in low-density (LD) gel dosimeters. This method offers superior sensitivity and dose resolution compared to existing techniques, particularly for high-dose applications in radiation therapy.

Keywords:
Fitting algorithmlow-density polymer gel dosimeterlung equivalent gelquantification method

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Image Analysis

Background:

  • Low signal-to-noise ratio (SNR) in low-density (LD) gel dosimeters complicates accurate dose quantification compared to unit-density (UD) gels.
  • Existing quantification methods may not be optimal for the specific challenges posed by LD gel dosimeters.

Purpose of the Study:

  • To introduce and evaluate a novel noise correction and exponential (NCEXP) fitting method for quantifying dose absorption in LD gel dosimeters.
  • To compare the performance of the NCEXP method against established techniques like maximum likelihood estimation of Rician distribution (MLE-R) and variable echo number (VAREC).

Main Methods:

  • Developed a new quantification method based on noise correction and exponential (NCEXP) fitting.
  • Evaluated the NCEXP method by analyzing sensitivity, dose resolution, detectable dynamic range, and calibration curve correlation for both LD and UD gel dosimeters.
  • Compared NCEXP results with MLE-R and VAREC methods.

Main Results:

  • The NCEXP method yielded a more sensitive calibration curve and superior dose resolution for both LD and UD gels.
  • LD gel dosimeters demonstrated a wider detectable dynamic range than UD gels.
  • The benefits of the NCEXP method were most pronounced in LD gel analysis at higher absorbed doses (≥10 Gy) where SNR is reduced.
  • Unlike the VAREC method's inverse effect on UD gels, NCEXP did not alter the dynamic dose range of LD gels.

Conclusions:

  • The NCEXP method is more effective for quantifying dose absorption in LD gel dosimeters compared to MLE-R and VAREC.
  • NCEXP is particularly advantageous in scenarios involving high-dose absorption and steep dose gradients, such as intensity-modulated radiation therapy and stereotactic radiosurgery.