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Lens dose to standing patients treated with electrons to the hand.

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Title: Lens dose to standing patients treated with electrons to the hand.
Authors: Van Schelt, Jonathon1 (AUTHOR) jonathon_vanschelt@rush.edu
Source: Medical Dosimetry. Winter 2021, Vol. 46 Issue 4, pe7-e10. 4p.
Subjects: Electrons, Crystal glass, Linear accelerators, Curriculum
Abstract: Patients receiving radiotherapy to the hand are sometimes treated standing, with their heads beside and potentially facing an electron applicator. This raises the possibility of consequential lens dose from scattered electrons, which this study investigates. This study measures the dose beside an applicator at a depth of 3 mm in a phantom as an estimate of lens dose for such patients. The lens dose is investigated as a function of height, distance, beam energy, applicator size, and cutout fill on a Varian Trilogy linear accelerator. The effect of the potential mitigation strategies of turning the head or shielding with lead sheets is also investigated. Measurement found that a typical hand setup may result in the lens receiving 0.15% of the treatment dose, which would deliver a cumulative dose above the demonstrated threshold dose for cataract risk for some courses. Large applicators and close facial proximity to the applicator separately enhance dose by factors of 3 and 5 respectively, raising the possibility of multiple gray to the lens for patients in unfavorable setups. Simple and effective mitigation strategies are available: Turning the patient's head to the side or placing 1–2 mm of lead on glasses reduced lens dose by a factor of 3–4, and covering the side of the applicator with 1 mm of lead or turning the head completely away effectively eliminated lens dose. The lens dose can be consequential but is readily mitigated. [ABSTRACT FROM AUTHOR]
Copyright of Medical Dosimetry is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 153031270
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Lens dose to standing patients treated with electrons to the hand.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Van+Schelt%2C+Jonathon%22">Van Schelt, Jonathon</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jonathon_vanschelt@rush.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Medical+Dosimetry%22">Medical Dosimetry</searchLink>. Winter 2021, Vol. 46 Issue 4, pe7-e10. 4p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Electrons%22">Electrons</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+glass%22">Crystal glass</searchLink><br /><searchLink fieldCode="DE" term="%22Linear+accelerators%22">Linear accelerators</searchLink><br /><searchLink fieldCode="DE" term="%22Curriculum%22">Curriculum</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Patients receiving radiotherapy to the hand are sometimes treated standing, with their heads beside and potentially facing an electron applicator. This raises the possibility of consequential lens dose from scattered electrons, which this study investigates. This study measures the dose beside an applicator at a depth of 3 mm in a phantom as an estimate of lens dose for such patients. The lens dose is investigated as a function of height, distance, beam energy, applicator size, and cutout fill on a Varian Trilogy linear accelerator. The effect of the potential mitigation strategies of turning the head or shielding with lead sheets is also investigated. Measurement found that a typical hand setup may result in the lens receiving 0.15% of the treatment dose, which would deliver a cumulative dose above the demonstrated threshold dose for cataract risk for some courses. Large applicators and close facial proximity to the applicator separately enhance dose by factors of 3 and 5 respectively, raising the possibility of multiple gray to the lens for patients in unfavorable setups. Simple and effective mitigation strategies are available: Turning the patient's head to the side or placing 1–2 mm of lead on glasses reduced lens dose by a factor of 3–4, and covering the side of the applicator with 1 mm of lead or turning the head completely away effectively eliminated lens dose. The lens dose can be consequential but is readily mitigated. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Medical Dosimetry is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=153031270
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.meddos.2021.04.005
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 4
        StartPage: e7
    Subjects:
      – SubjectFull: Electrons
        Type: general
      – SubjectFull: Crystal glass
        Type: general
      – SubjectFull: Linear accelerators
        Type: general
      – SubjectFull: Curriculum
        Type: general
    Titles:
      – TitleFull: Lens dose to standing patients treated with electrons to the hand.
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            NameFull: Van Schelt, Jonathon
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            – D: 01
              M: 12
              Text: Winter 2021
              Type: published
              Y: 2021
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              Value: 46
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              Value: 4
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            – TitleFull: Medical Dosimetry
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