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AAPM task group report 351: Protocol for clinical reference dosimetry in external beam MR‐guided radiotherapy.

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Title: AAPM task group report 351: Protocol for clinical reference dosimetry in external beam MR‐guided radiotherapy.
Authors: Sarfehnia, Arman1,2 (AUTHOR) arman.sarfehnia@sunnybrook.ca, Alvarez, Paola E.3 (AUTHOR), Bellon, Maria R.4 (AUTHOR), Bouchard, Hugo5,6,7 (AUTHOR), Prez, Leon de8 (AUTHOR), Dolan, James E.9 (AUTHOR), Ibbott, Geoffrey S.10 (AUTHOR), Malkov, Victor11 (AUTHOR), Muir, Bryan R.12 (AUTHOR), Rogers, David W. O.13 (AUTHOR), Asselen, Bram van14 (AUTHOR), Wolthaus, Jochem W. H.14 (AUTHOR), Yadav, Poonam15 (AUTHOR)
Source: Medical Physics. Jul2025, Vol. 52 Issue 7, p1-20. 20p.
Subjects: Medical dosimetry, Radiotherapy, Image-guided radiation therapy, Medical physics, Standard operating procedure, Magnetic fields
Abstract: Background: Magnetic Resonance‐guided Radiation Therapy (MRgRT) systems are increasingly used in clinical practice, necessitating a dedicated dosimetry protocol to address the challenges posed by the presence of strong magnetic fields. Purpose: AAPM TG351 introduces a reference dosimetry protocol for external beam MRgRT systems, aligning with AAPM TG51 reports and incorporating elements from the IAEA TRS398 code of practice. Methods: The protocol offers practical guidance on beam quality and dosimetry setup in the presence of strong magnetic fields. It reviews relevant literature to identify reference‐class chambers suitable for external beam MRgRT systems and determines their beam quality conversion and other relevant correction factors through a detailed analysis of available data and associated uncertainties. Results: AAPM TG351 offers a comprehensive dosimetry protocol for external beam MRgRT systems, addressing the unique challenges posed by the presence of magnetic fields. It includes detailed guidance for measurement setups, a list of reference‐class chambers appropriate for reference dosimetry in MRgRT systems, and updated beam quality conversion and correction factors. Additionally, the protocol presents an in‐depth analysis of the uncertainty budget, identifying key contributors and providing strategies to minimize uncertainties, thereby enhancing clinical accuracy and reliability. Conclusions: This protocol provides a practical, evidence‐based reference for medical physicists conducting reference dosimetry in external beam MRgRT systems. [ABSTRACT FROM AUTHOR]
Copyright of Medical Physics is the property of Wiley-Blackwell 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.)
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  Data: AAPM task group report 351: Protocol for clinical reference dosimetry in external beam MR‐guided radiotherapy.
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  Data: <searchLink fieldCode="AR" term="%22Sarfehnia%2C+Arman%22">Sarfehnia, Arman</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> arman.sarfehnia@sunnybrook.ca</i><br /><searchLink fieldCode="AR" term="%22Alvarez%2C+Paola+E%2E%22">Alvarez, Paola E.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bellon%2C+Maria+R%2E%22">Bellon, Maria R.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bouchard%2C+Hugo%22">Bouchard, Hugo</searchLink><relatesTo>5,6,7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Prez%2C+Leon+de%22">Prez, Leon de</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dolan%2C+James+E%2E%22">Dolan, James E.</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ibbott%2C+Geoffrey+S%2E%22">Ibbott, Geoffrey S.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Malkov%2C+Victor%22">Malkov, Victor</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Muir%2C+Bryan+R%2E%22">Muir, Bryan R.</searchLink><relatesTo>12</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rogers%2C+David+W%2E+O%2E%22">Rogers, David W. O.</searchLink><relatesTo>13</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Asselen%2C+Bram+van%22">Asselen, Bram van</searchLink><relatesTo>14</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wolthaus%2C+Jochem+W%2E+H%2E%22">Wolthaus, Jochem W. H.</searchLink><relatesTo>14</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yadav%2C+Poonam%22">Yadav, Poonam</searchLink><relatesTo>15</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Medical+Physics%22">Medical Physics</searchLink>. Jul2025, Vol. 52 Issue 7, p1-20. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Medical+dosimetry%22">Medical dosimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Radiotherapy%22">Radiotherapy</searchLink><br /><searchLink fieldCode="DE" term="%22Image-guided+radiation+therapy%22">Image-guided radiation therapy</searchLink><br /><searchLink fieldCode="DE" term="%22Medical+physics%22">Medical physics</searchLink><br /><searchLink fieldCode="DE" term="%22Standard+operating+procedure%22">Standard operating procedure</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Background: Magnetic Resonance‐guided Radiation Therapy (MRgRT) systems are increasingly used in clinical practice, necessitating a dedicated dosimetry protocol to address the challenges posed by the presence of strong magnetic fields. Purpose: AAPM TG351 introduces a reference dosimetry protocol for external beam MRgRT systems, aligning with AAPM TG51 reports and incorporating elements from the IAEA TRS398 code of practice. Methods: The protocol offers practical guidance on beam quality and dosimetry setup in the presence of strong magnetic fields. It reviews relevant literature to identify reference‐class chambers suitable for external beam MRgRT systems and determines their beam quality conversion and other relevant correction factors through a detailed analysis of available data and associated uncertainties. Results: AAPM TG351 offers a comprehensive dosimetry protocol for external beam MRgRT systems, addressing the unique challenges posed by the presence of magnetic fields. It includes detailed guidance for measurement setups, a list of reference‐class chambers appropriate for reference dosimetry in MRgRT systems, and updated beam quality conversion and correction factors. Additionally, the protocol presents an in‐depth analysis of the uncertainty budget, identifying key contributors and providing strategies to minimize uncertainties, thereby enhancing clinical accuracy and reliability. Conclusions: This protocol provides a practical, evidence‐based reference for medical physicists conducting reference dosimetry in external beam MRgRT systems. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Medical Physics is the property of Wiley-Blackwell 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.)
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        Value: 10.1002/mp.17884
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        Text: English
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      – SubjectFull: Medical dosimetry
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      – SubjectFull: Radiotherapy
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      – SubjectFull: Image-guided radiation therapy
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              Text: Jul2025
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