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Technical note: Phantom‐based evaluation of CBCT dose calculation accuracy for use in adaptive radiotherapy.

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Title: Technical note: Phantom‐based evaluation of CBCT dose calculation accuracy for use in adaptive radiotherapy.
Authors: Wessels, Claas1 (AUTHOR) claas.wessels@varian.com, Strzelecki, Adam1 (AUTHOR), Plamondon, Mathieu1 (AUTHOR), Lehmann, Mathias1 (AUTHOR), Peterlik, Igor1 (AUTHOR), Paysan, Pascal1 (AUTHOR), Nagy, Balazs1 (AUTHOR), Heinz, Alexander1 (AUTHOR), Seghers, Dieter1 (AUTHOR), Thompson, Stephen2 (AUTHOR), Scheib, Stefan G.1 (AUTHOR)
Source: Medical Physics. Oct2024, Vol. 51 Issue 10, p7492-7499. 8p.
Subjects: Radiotherapy treatment planning, Cone beam computed tomography, Computed tomography, Image registration, Linear accelerators
Abstract: Background: High‐quality 3D‐anatomy of the day is needed for treatment plan adaptation in radiotherapy. For online x‐ray‐based CBCT workflows, one approach is to create a synthetic CT or to utilize a fan‐beam CT with corresponding registrations. The former potentially introduces uncertainties in the dose calculation if deformable image registration is used. The latter can introduce burden and complexity to the process, the facility, and the patient. Purpose: Using the CBCT of the day, acquired on the treatment device, for direct dose calculation and plan adaptation can overcome these limitations. This study aims to assess the accuracy of the calculated dose on the CBCT scans acquired on a Halcyon linear accelerator equipped with HyperSight. Methods: HyperSight's new CBCT reconstruction algorithm includes improvements in scatter correction, HU calibration of the imager, and beam shape adaptation. Furthermore, HyperSight introduced a new x‐ray detector. To show the effect of the implemented improvements, gamma comparisons of 2%/2 mm, 2%/1 mm, and 1%/1 mm were made between the dose distribution in phantoms calculated on the CBCT reconstructions and the simulation CT scans, considering this the standard of care. The resulting gamma passing rates were compared to those obtained with the Halcyon 3.0 reconstruction and hardware without HyperSight's technologies. Various anatomical phantoms for dosimetric evaluations on brain, head and neck, lung, breast, and prostate cases have been used in this study. Results: The overall results demonstrated that HyperSight outperformed the Halcyon 3.0 version. Based on the gamma analysis, the calculated dose using HyperSight was closer to the CT scan‐based doses than the calculated dose using iCBCT Halcyon 3.0 for most cases. Over all plans and gamma criteria, Halcyon 3.0 achieved an average passing rate of 92.9%, whereas HyperSight achieved 98.1%. Conclusion: Using HyperSight CBCT images for direct dose calculation, for example, in (online) plan adaptation, seems feasible for the investigated cases. [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: Technical note: Phantom‐based evaluation of CBCT dose calculation accuracy for use in adaptive radiotherapy.
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  Data: <searchLink fieldCode="AR" term="%22Wessels%2C+Claas%22">Wessels, Claas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> claas.wessels@varian.com</i><br /><searchLink fieldCode="AR" term="%22Strzelecki%2C+Adam%22">Strzelecki, Adam</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Plamondon%2C+Mathieu%22">Plamondon, Mathieu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lehmann%2C+Mathias%22">Lehmann, Mathias</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Peterlik%2C+Igor%22">Peterlik, Igor</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Paysan%2C+Pascal%22">Paysan, Pascal</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nagy%2C+Balazs%22">Nagy, Balazs</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Heinz%2C+Alexander%22">Heinz, Alexander</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Seghers%2C+Dieter%22">Seghers, Dieter</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Thompson%2C+Stephen%22">Thompson, Stephen</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Scheib%2C+Stefan+G%2E%22">Scheib, Stefan G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Medical+Physics%22">Medical Physics</searchLink>. Oct2024, Vol. 51 Issue 10, p7492-7499. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Radiotherapy+treatment+planning%22">Radiotherapy treatment planning</searchLink><br /><searchLink fieldCode="DE" term="%22Cone+beam+computed+tomography%22">Cone beam computed tomography</searchLink><br /><searchLink fieldCode="DE" term="%22Computed+tomography%22">Computed tomography</searchLink><br /><searchLink fieldCode="DE" term="%22Image+registration%22">Image registration</searchLink><br /><searchLink fieldCode="DE" term="%22Linear+accelerators%22">Linear accelerators</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Background: High‐quality 3D‐anatomy of the day is needed for treatment plan adaptation in radiotherapy. For online x‐ray‐based CBCT workflows, one approach is to create a synthetic CT or to utilize a fan‐beam CT with corresponding registrations. The former potentially introduces uncertainties in the dose calculation if deformable image registration is used. The latter can introduce burden and complexity to the process, the facility, and the patient. Purpose: Using the CBCT of the day, acquired on the treatment device, for direct dose calculation and plan adaptation can overcome these limitations. This study aims to assess the accuracy of the calculated dose on the CBCT scans acquired on a Halcyon linear accelerator equipped with HyperSight. Methods: HyperSight's new CBCT reconstruction algorithm includes improvements in scatter correction, HU calibration of the imager, and beam shape adaptation. Furthermore, HyperSight introduced a new x‐ray detector. To show the effect of the implemented improvements, gamma comparisons of 2%/2 mm, 2%/1 mm, and 1%/1 mm were made between the dose distribution in phantoms calculated on the CBCT reconstructions and the simulation CT scans, considering this the standard of care. The resulting gamma passing rates were compared to those obtained with the Halcyon 3.0 reconstruction and hardware without HyperSight's technologies. Various anatomical phantoms for dosimetric evaluations on brain, head and neck, lung, breast, and prostate cases have been used in this study. Results: The overall results demonstrated that HyperSight outperformed the Halcyon 3.0 version. Based on the gamma analysis, the calculated dose using HyperSight was closer to the CT scan‐based doses than the calculated dose using iCBCT Halcyon 3.0 for most cases. Over all plans and gamma criteria, Halcyon 3.0 achieved an average passing rate of 92.9%, whereas HyperSight achieved 98.1%. Conclusion: Using HyperSight CBCT images for direct dose calculation, for example, in (online) plan adaptation, seems feasible for the investigated cases. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  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.17325
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