{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T19:55:40Z","timestamp":1791230140702,"version":"4.1.0"},"reference-count":22,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2024,12,1]],"date-time":"2024-12-01T00:00:00Z","timestamp":1733011200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["aapm.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Applied Clin Med Phys"],"published-print":{"date-parts":[[2025,4]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Stereotactic ablative radiotherapy (SABR) has become a key technique in management of spine metastases. With improved control over treatment plan dosimetry, there is a greater need for accurate patient positioning to guarantee agreement between the treatment plan and delivered dose. With serious potential complications such as fracture and myelopathy, the margins of error in SABR of the spine are minimal. In this study, we assessed the performance of two patient immobilization setups in SABR for spinal metastases. First, a Type\u2010S head and shoulders mask (CQ Medical, Avondale, PA), and second, the BPL1 setup, which includes a wing board, vacuum bag, and the Respiratory Belt for the Body Pro\u2010Lok ONE (CQ Medical, Avondale, PA). Immobilization was assessed using image\u2010guided intrafraction repositioning shifts. Required planning target volume (PTV) margins were calculated based on repositioning data for 172 treated fractions using 2 standard deviation (2SD) and analytic approaches. Overall, 91.7% and 74.1% of fractions treated had total 3D repositioning shifts \u22643.0\u00a0\u00a0mm using the Type\u2010S and BPL1 setups, respectively. In the thoracic spine, 43.2% and 46.5% of fractions had shifts \u22641.5\u00a0\u00a0mm for the respective setups. Suggested margins were under 3.5\u00a0\u00a0mm in all directions and use cases. In the posterior\u2010anterior direction, the BPL1 setup had a 0.6\u00a0\u00a0mm smaller suggested margin for the thoracic spine compared to the Type\u2010S setup, at 1.4\u00a0\u00a0mm, calculated using the analytic approach. Both the Type\u2010S and BPL1 setups are effective for immobilization in spine SABR. The Type\u2010S demonstrated superior immobilization in the upper spine and remains the clinical standard for cervical and upper thoracic spine positioning. The BPL1 setup showed effective immobilization in use cases treating the mid\u2010to lower thoracic spine and lumbar spine and remains our clinical standard for those use cases. Results additionally demonstrate feasibility of potential PTV margin reduction.<\/jats:p>","DOI":"10.1002\/acm2.14577","type":"journal-article","created":{"date-parts":[[2024,12,1]],"date-time":"2024-12-01T15:57:46Z","timestamp":1733068666000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Efficacy of a thermoplastic mask and pneumatic abdominal compression device for immobilization in stereotactic ablative radiotherapy of spine metastases"],"prefix":"10.1002","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3758-9093","authenticated-orcid":false,"given":"Yohan A.","family":"Walter","sequence":"first","affiliation":[{"name":"Department of Radiation Oncology Willis Knighton Cancer Center  Shreveport Louisiana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel B.","family":"Speir","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Willis Knighton Cancer Center  Shreveport Louisiana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William E.","family":"Burrell","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Willis Knighton Cancer Center  Shreveport Louisiana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chiachien J.","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Willis Knighton Cancer Center  Shreveport Louisiana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hsinshun T.","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Willis Knighton Cancer Center  Shreveport Louisiana 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