The impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvis
Background and purpose: Metallic implants cause artefacts in computed tomography (CT) images and can introduce significant errors to structure visualisation and dosimetric calculation within the radiotherapy planning process. This study evaluated an orthopaedic metal artefact reduction algorithm and...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Physics and Imaging in Radiation Oncology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405631622000975 |
| _version_ | 1798006090297769984 |
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| author | John King Shona Whittam David Smith Bashar Al-Qaisieh |
| author_facet | John King Shona Whittam David Smith Bashar Al-Qaisieh |
| author_sort | John King |
| collection | DOAJ |
| description | Background and purpose: Metallic implants cause artefacts in computed tomography (CT) images and can introduce significant errors to structure visualisation and dosimetric calculation within the radiotherapy planning process. This study evaluated an orthopaedic metal artefact reduction algorithm and its effect on the CT number, image noise, structure delineation, and treatment dose. Methods: Raw CT data were reconstructed using standard filtered back projection and an artefact reduction algorithm to create ‘standard’ and ‘corrected’ images. A phantom containing tissue-mimicking inserts and two titanium plugs was imaged. The average CT number was compared to baseline data acquired without metal inserts. Data from 11 pelvic external beam radiotherapy (EBRT) patients with bi- or uni-lateral hip implants were retrospectively analysed. The clinically used treatment plans were re-computed on the corrected images. A prostate-mimicking phantom containing metal ‘implants’ was imaged, and 11 observers contoured both reconstructions. Results: The artefact reduction algorithm improved the CT number in those areas most affected by metal artefacts and decreased noise by 19 % (P =.04) Changes in dose distributions on corrected images compared to those calculated using the current clinical protocol were clinically insignificant. Volumes contoured on the corrected phantom images had larger Dice coefficients than those contoured on the standard images (P =.001), as well as a 36 % lower standard deviation in volumes. Conclusion: This study demonstrates that the metal artefact reduction software reduces the error in CT numbers, can improve delineation accuracy, and can reduce inter-observer variability. It has the potential to streamline the planning pathway and improve treatment planning accuracy. |
| first_indexed | 2024-04-11T12:49:29Z |
| format | Article |
| id | doaj.art-30314108f46b44ff9379de9d21d39161 |
| institution | Directory Open Access Journal |
| issn | 2405-6316 |
| language | English |
| last_indexed | 2024-04-11T12:49:29Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics and Imaging in Radiation Oncology |
| spelling | doaj.art-30314108f46b44ff9379de9d21d391612022-12-22T04:23:15ZengElsevierPhysics and Imaging in Radiation Oncology2405-63162022-10-0124138143The impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvisJohn King0Shona Whittam1David Smith2Bashar Al-Qaisieh3Leeds Cancer Centre, St James’s University Hospital, Bexley Wing, Beckett St, Leeds LS97FT, United KingdomLeeds Cancer Centre, St James’s University Hospital, Bexley Wing, Beckett St, Leeds LS97FT, United KingdomCorresponding author.; Leeds Cancer Centre, St James’s University Hospital, Bexley Wing, Beckett St, Leeds LS97FT, United KingdomLeeds Cancer Centre, St James’s University Hospital, Bexley Wing, Beckett St, Leeds LS97FT, United KingdomBackground and purpose: Metallic implants cause artefacts in computed tomography (CT) images and can introduce significant errors to structure visualisation and dosimetric calculation within the radiotherapy planning process. This study evaluated an orthopaedic metal artefact reduction algorithm and its effect on the CT number, image noise, structure delineation, and treatment dose. Methods: Raw CT data were reconstructed using standard filtered back projection and an artefact reduction algorithm to create ‘standard’ and ‘corrected’ images. A phantom containing tissue-mimicking inserts and two titanium plugs was imaged. The average CT number was compared to baseline data acquired without metal inserts. Data from 11 pelvic external beam radiotherapy (EBRT) patients with bi- or uni-lateral hip implants were retrospectively analysed. The clinically used treatment plans were re-computed on the corrected images. A prostate-mimicking phantom containing metal ‘implants’ was imaged, and 11 observers contoured both reconstructions. Results: The artefact reduction algorithm improved the CT number in those areas most affected by metal artefacts and decreased noise by 19 % (P =.04) Changes in dose distributions on corrected images compared to those calculated using the current clinical protocol were clinically insignificant. Volumes contoured on the corrected phantom images had larger Dice coefficients than those contoured on the standard images (P =.001), as well as a 36 % lower standard deviation in volumes. Conclusion: This study demonstrates that the metal artefact reduction software reduces the error in CT numbers, can improve delineation accuracy, and can reduce inter-observer variability. It has the potential to streamline the planning pathway and improve treatment planning accuracy.http://www.sciencedirect.com/science/article/pii/S2405631622000975Computed tomographyRadiotherapyArtefact reductionPelvis radiotherapy |
| spellingShingle | John King Shona Whittam David Smith Bashar Al-Qaisieh The impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvis Physics and Imaging in Radiation Oncology Computed tomography Radiotherapy Artefact reduction Pelvis radiotherapy |
| title | The impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvis |
| title_full | The impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvis |
| title_fullStr | The impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvis |
| title_full_unstemmed | The impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvis |
| title_short | The impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvis |
| title_sort | impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvis |
| topic | Computed tomography Radiotherapy Artefact reduction Pelvis radiotherapy |
| url | http://www.sciencedirect.com/science/article/pii/S2405631622000975 |
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