{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T04:27:42Z","timestamp":1790396862799,"version":"4.1.0"},"reference-count":89,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T00:00:00Z","timestamp":1759881600000},"content-version":"vor","delay-in-days":7,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,10,1]],"date-time":"2025-10-01T00:00:00Z","timestamp":1759276800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["aapm.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Medical Physics"],"published-print":{"date-parts":[[2025,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Metal artifact reduction (MAR) is a long\u2010standing challenge in CT imaging. The presence of highly attenuating objects, such as dental fillings, hip prostheses, spinal screws\/rods, and gold fiducial markers, can introduce severe streak artifacts in CT images, often reducing their diagnostic value. Existing CT MAR studies typically define their own test cases and evaluation metrics, making it difficult to objectively and comprehensively compare the performance of different MAR methods. There is a widespread need for a universal CT MAR image quality benchmark to evaluate the clinical impact of new MAR methods and compare them to state\u2010of\u2010the\u2010art techniques.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>The goal of the AAPM CT Metal Artifact Reduction (CT\u2010MAR) grand challenge was to create and distribute a clinically representative 2D MAR performance benchmark, and to invite participants to objectively compare the performance of their MAR methods based on this benchmark. A secondary goal was to facilitate MAR development by disseminating a MAR training database and tools. After completion of the grand challenge, the MAR benchmark and the MAR training database will remain publicly accessible for future MAR developments and benchmarking.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Grand challenge participants were invited to submit results for their MAR algorithm. The challenge organizers provided 14,000 CT training datasets generated using a hybrid data simulation framework that combined real patient images\u2014including lung, abdomen, liver, head, and pelvis\u2014with virtual metal objects. Each training dataset included five types of data: CT sinograms (uncorrected and metal\u2010free), CT reconstructed images (uncorrected and metal\u2010free), and metal masks. In the final evaluation phase, 29 clinical uncorrected datasets with metal were provided in both the sinogram and image domains for participants to process with their MAR algorithms. Their results were evaluated using eight clinically relevant image quality metrics. The final ranking was determined and compared to an established normalized metal artifact reduction (NMAR) reference method. Additionally, we conducted a survey to better understand the methodologies used by participants.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>A total of 106 teams registered for the challenge, with 26 teams completing all phases of the challenge. 92% of these\u2014including all top ten teams\u2014used a deep learning (DL) approach, employing a variety of network architectures such as UNet, ResNet, GAN, diffusion models, and transformers. Additionally, 22% of the teams\u2014including the top three teams\u2014utilized a combination of sinogram\u2010 and image\u2010domain approaches. The results showed a broad distribution of the scores. Overall, the competition was marked by diverse methods and a wide range of results, including some truly exceptional results. More than 70% of the teams achieved a better overall score than the popular baseline NMAR method.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The CT\u2010MAR grand challenge provided an opportunity to benchmark state\u2010of\u2010the\u2010art MAR algorithms. Our hybrid data generation framework was a powerful tool for simulating large\u2010scale realistic datasets for MAR algorithm development. A clinically relevant universal MAR benchmark offered an objective and meaningful way to compare different approaches. The training data and benchmark were published online to support future MAR development.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/mp.70050","type":"journal-article","created":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T08:33:13Z","timestamp":1759912393000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["AAPM CT metal artifact reduction grand challenge"],"prefix":"10.1002","volume":"52","author":[{"given":"Eri","family":"Haneda","sequence":"first","affiliation":[{"name":"GE HealthCare Technology and Innovation Center  Niskayuna New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nils","family":"Peters","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Massachusetts General Hospital and Harvard Medical School  Boston Massachusetts USA"},{"name":"Department of Radiation Oncology University of Washington &amp; Fred Hutch Cancer Center  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