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2 results

  • Study of dosimetric indices and dose constraints to critical organs for head and neck tumours treated with inverse planned simultaneous integrated boost intensity-modulated radiotherapy

  • Atia Atiq, Maria Atiq, Khalid Iqbal, Qurat-ul-ain Shamsi, Saeed Ahmad Buzdar
  • Journal:
    Journal of Radiotherapy in Practice / Volume 17 / Issue 2 / June 2018
    Published online by Cambridge University Press:
    04 December 2017, pp. 179-187
  • Aim

    This study aimed to investigate tolerance dose to organs at risk (OARs) as well as degree of conformity and homogeneity for head and neck cancer patients by using simultaneous integrated boost intensity-modulated radiotherapy technique (SIB IMRT).

    Materials and methods

    This study analysed 15 head and neck cancer patients receiving treatment using inverse planned SIB IMRT technique. Using a beam energy of 6 MV, two dose levels of 70 and 55·4 Gy were used to treat the tumour. Doses of 2 Gy in 35 fractions and 1·68 Gy in 33 fractions were simultaneously delivered for effective planning target volume (PTV1) and boost planning target volume (PTV2), respectively.

    Results

    Dose distribution in PTV and critical organs lies within tolerance dose guidelines protecting spinal cord, brain stem, optic chiasm, optic nerve, thus reducing the risk of damage to normal tissues. Minor deviation from tolerance limit was observed for parotid glands. This technique provided highly conformal and homogenous dose distribution as well as better sparing of OARs, hence verifying quality assurance results to be satisfactory.

    Findings

    SIB IMRT technique offers best solution for preserving organ function by keeping dose below tolerance level. Treatment of head and neck carcinoma using SIB IMRT is feasible, more efficient, and dose escalation is achieved in a single plan.

  • The practical considerations of dose constraints in diagnosticmedical departments using ionizing radiation

  • H. Piwowarska-Bilska, M. Nowak, M. H. Listewnik, P. Zorga, B. Birkenfeld
  • Journal:
    Radioprotection / Volume 49 / Issue 1 / January 2014
    Published online by Cambridge University Press:
    06 November 2013, pp. 23-25
    Print publication:
    January 2014

  • The term “dose constraint” has been used in radiological protection since 1990. Itspractical application has varied from country to country to the present day. The authorsof this paper believe that it is an underestimated tool for the purpose of radiologicalprotection. This study aims to estimate local dose constraints for workers in conventionalnuclear medicine and radiology departments, on the basis of doses received in the last 3to 4 years by different groups of workers. The levels of exposure to employees of thenuclear medicine department correspond well to levels in other countries, but foremployees belonging to the radiology department, the levels are significantly lower.Unification of the practical application of dose constraints and legislation concerningtheir specific values would increase the relevance and effectiveness of these operationalunits. This is a playing field for radiation safety officers for the determination andwidespread publication of local dose constraints in their particular medical departments.