NCS Report 18: Code of practice for the absorbed dose determination in high energy photon and electron beams

Aalbers, A.H.L.; Hoornaert, M.T.; Minken, Awh; Pieksma, Marc; Prez, Leon de; Reynaert, N.; Vynckier, Stefaan; Wittkämper, F.W.

doi:10.25030/ncs-018

Cited by 33 publications

(58 citation statements)

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“…These perturbations are assumed to be small and independent of each other. Dosimetry protocols for conventional reference dosimetry include explicitly or implicitly such perturbation correction factors to correct the detector response from the calibration beam quality to the user's beam quality.…”

Section: Physics Of Small‐field Dosimetrymentioning

confidence: 99%

“…Current dosimetry protocols [1][2][3][4][5][6][7] recommend that a water phantom be used for the determination of the reference absorbed dose to water at a reference depth in megavoltage photon beams. It is acknowledged, however, that, in certain situations, it might be more convenient for the user to perform the measurements in a plastic phantom while still determining the quantity absorbed dose to water from these measurements.…”

Section: C Measurement In Plastic Phantomsmentioning

confidence: 99%

“…The reference dosimetry of external high-energy photon beams used in radiotherapy is currently based on nationally or internationally adopted Codes of Practice (CoPs), or dosimetry protocols, such as IAEA TRS 398, 1 AAPM TG-51, 2 and its Addendum 3 or others. [4][5][6][7] These CoPs are based on measurements with ionization chambers that have calibration coefficients in terms of absorbed dose to water, traceable to primary standards. The reference conditions for which these calibration coefficients are valid include the specification of a reference field size of 10 cm 9 10 cm.…”

Section: Introductionmentioning

confidence: 99%

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Dosimetry of small static fields used in external photon beam radiotherapy: Summary of TRS‐483, the IAEA–AAPM international Code of Practice for reference and relative dose determination

Palmans

Andreo

Huq³

et al. 2018

Medical Physics

242

445

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Purpose A joint IAEA/AAPM international working group has developed a Code of Practice (CoP) for the dosimetry of small static fields used in external megavoltage photon beam radiotherapy, published by the IAEA as TRS‐483. This summary paper introduces and outlines the main aspects of the CoP. Methods IAEA TRS‐483 is a condensation of the wide range of different approaches that have been described in the literature for the reference dosimetry of radiotherapy machines with nominal accelerating potential up to 10 MV that cannot establish the conventional 10 cm × 10 cm reference field, and for the determination of field output factors for relative dosimetry in small static photon fields. The formalism used is based on that developed by Alfonso et al. [Med Phys. 2008;35:5179–5186] for this modality. Results Three introductory sections describe the rationale and context of the CoP, the clinical use of small photon fields, and the physics of small‐field dosimetry. In the fourth section, definitions of terms that are specific to the CoP (as compared to previous CoPs for broad‐beam reference dosimetry, such as IAEA TRS‐398 and AAPM TG‐51) are given; this section includes a list of the symbols and equivalences between IAEA and AAPM nomenclature to facilitate the practical implementation of the CoP by end users of IAEA TRS‐398 and AAPM TG‐51. The fifth section summarizes the equations and procedures that are recommended in the CoP and the sixth section provides an overview of the methods used to derive the data provided in IAEA TRS‐483. Conclusions This is the first time an international Code of Practice for the dosimetry of small photon fields based on comprehensive data and correction factors has been published. This joint IAEA/AAPM CoP will ensure consistent reference dosimetry traceable to the international System of Units and enable common and internationally harmonized procedures to be followed by radiotherapy centers worldwide for the dosimetry of small static megavoltage photon fields.

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Section: Physics Of Small‐field Dosimetrymentioning

confidence: 99%

Section: C Measurement In Plastic Phantomsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dosimetry of small static fields used in external photon beam radiotherapy: Summary of TRS‐483, the IAEA–AAPM international Code of Practice for reference and relative dose determination

Palmans

Andreo

Huq³

et al. 2018

Medical Physics

242

445

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“…This work determines the reliability of the k Q factors obtained in both ways and provides a detailed comparison of measured and calculated k Q factors. Measured k Q factors have been determined in previous publications using water calorimetry [3][4][5][6][7][8] or Fricke dosimetry. [9][10][11][12] However, aside from the work of McEwen, 1 experimental determination of k Q has been limited to only a few chamber types.…”

Section: Introductionmentioning

confidence: 99%

Measured and Monte Carlo calculated k_Q factors: Accuracy and comparison

2011

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“…Absolute dosimetry of the small photon fields with ionization chambers is constrained by the lack of charged particle equilibrium in the radiation field and the size of the detector, invalidating the application of open-field dosimetry protocol data for the derivation of absorbed dose to water from ionization chamber measurements [6,10,13,63,64]. The chamber's sensitive volume effect can be solved in part by the development of micro ionization chambers, but considerable uncertainty exists with regard to the validity of using existing dosimetry data with such chambers.…”

Section: Output Factors Related To Dosimetry Systems Usedmentioning

confidence: 99%

NCS Report 25: Process management and quality assurance for intracranial stereotactic treatment

Heukelom¹,

Hoffmans-Holtzer²,

Marijnissen³

et al. 2015

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The NCS frequently publishes reports for fellow professionals in which recommendations are given for various quality control procedures or otherwise. The members of the NCS board and the members of the concerning subcommittee do not claim any authority exceeding that of their professional expertise. Responsibility on how the NCS recommendations are implemented lies with the user, taking into account the practice in his/her institution.

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NCS Report 18: Code of practice for the absorbed dose determination in high energy photon and electron beams

Cited by 33 publications

References 0 publications

Dosimetry of small static fields used in external photon beam radiotherapy: Summary of TRS‐483, the IAEA–AAPM international Code of Practice for reference and relative dose determination

Dosimetry of small static fields used in external photon beam radiotherapy: Summary of TRS‐483, the IAEA–AAPM international Code of Practice for reference and relative dose determination

Measured and Monte Carlo calculated k_Q factors: Accuracy and comparison

NCS Report 25: Process management and quality assurance for intracranial stereotactic treatment

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NCS Report 18: Code of practice for the absorbed dose determination in high energy photon and electron beams

Cited by 33 publications

References 0 publications

Dosimetry of small static fields used in external photon beam radiotherapy: Summary of TRS‐483, the IAEA–AAPM international Code of Practice for reference and relative dose determination

Dosimetry of small static fields used in external photon beam radiotherapy: Summary of TRS‐483, the IAEA–AAPM international Code of Practice for reference and relative dose determination

Measured and Monte Carlo calculated kQ factors: Accuracy and comparison

NCS Report 25: Process management and quality assurance for intracranial stereotactic treatment

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Measured and Monte Carlo calculated k_Q factors: Accuracy and comparison