Austin Pfannenstiel, Haileigh Avellar, Clay Hallman, Brandon L Plattner, Margaret A Highland, Francois H Cornelis, Warren L Beard, Punit Prakash
{"title":"脊柱定向微波消融:计算模型的实验评估。","authors":"Austin Pfannenstiel, Haileigh Avellar, Clay Hallman, Brandon L Plattner, Margaret A Highland, Francois H Cornelis, Warren L Beard, Punit Prakash","doi":"10.1080/02656736.2024.2313492","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>Despite the theoretical advantages of treating metastatic bone disease with microwave ablation (MWA), there are few reports characterizing microwave absorption and bioheat transfer in bone. This report describes a computational modeling-based approach to simulate directional microwave ablation (dMWA) in spine, supported by <i>ex vivo</i> and pilot <i>in vivo</i> experiments in porcine vertebral bodies.</p><p><strong>Materials and methods: </strong>A 3D computational model of microwave ablation within porcine vertebral bodies was developed. <i>Ex vivo</i> porcine vertebra experiments using a dMWA applicator measured temperatures approximately 10.1 mm radially from the applicator in the direction of MW radiation (T1) and approximately 2.4 mm in the contra-lateral direction (T2). Histologic assessment of ablated <i>ex vivo</i> tissue was conducted and experimental results compared to simulations. Pilot <i>in vivo</i> experiments in porcine vertebral bodies assessed ablation zones histologically and with CT and MRI.</p><p><strong>Results: </strong>Experimental T1 and T2 temperatures were within 3-7% and 11-33% of simulated temperature values. Visible ablation zones, as indicated by grayed tissue, were smaller than those typical in other soft tissues. Posthumous MRI images of <i>in vivo</i> ablations showed hyperintensity. <i>In vivo</i> experiments illustrated the technical feasibility of creating directional microwave ablation zones in porcine vertebral body.</p><p><strong>Conclusion: </strong>Computational models and experimental studies illustrate the feasibility of controlled dMWA in bone tissue.</p>","PeriodicalId":14137,"journal":{"name":"International Journal of Hyperthermia","volume":null,"pages":null},"PeriodicalIF":3.0000,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11357707/pdf/","citationCount":"0","resultStr":"{\"title\":\"Directional microwave ablation in spine: experimental assessment of computational modeling.\",\"authors\":\"Austin Pfannenstiel, Haileigh Avellar, Clay Hallman, Brandon L Plattner, Margaret A Highland, Francois H Cornelis, Warren L Beard, Punit Prakash\",\"doi\":\"10.1080/02656736.2024.2313492\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background: </strong>Despite the theoretical advantages of treating metastatic bone disease with microwave ablation (MWA), there are few reports characterizing microwave absorption and bioheat transfer in bone. This report describes a computational modeling-based approach to simulate directional microwave ablation (dMWA) in spine, supported by <i>ex vivo</i> and pilot <i>in vivo</i> experiments in porcine vertebral bodies.</p><p><strong>Materials and methods: </strong>A 3D computational model of microwave ablation within porcine vertebral bodies was developed. <i>Ex vivo</i> porcine vertebra experiments using a dMWA applicator measured temperatures approximately 10.1 mm radially from the applicator in the direction of MW radiation (T1) and approximately 2.4 mm in the contra-lateral direction (T2). Histologic assessment of ablated <i>ex vivo</i> tissue was conducted and experimental results compared to simulations. Pilot <i>in vivo</i> experiments in porcine vertebral bodies assessed ablation zones histologically and with CT and MRI.</p><p><strong>Results: </strong>Experimental T1 and T2 temperatures were within 3-7% and 11-33% of simulated temperature values. Visible ablation zones, as indicated by grayed tissue, were smaller than those typical in other soft tissues. Posthumous MRI images of <i>in vivo</i> ablations showed hyperintensity. <i>In vivo</i> experiments illustrated the technical feasibility of creating directional microwave ablation zones in porcine vertebral body.</p><p><strong>Conclusion: </strong>Computational models and experimental studies illustrate the feasibility of controlled dMWA in bone tissue.</p>\",\"PeriodicalId\":14137,\"journal\":{\"name\":\"International Journal of Hyperthermia\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.0000,\"publicationDate\":\"2024-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11357707/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Hyperthermia\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1080/02656736.2024.2313492\",\"RegionNum\":3,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2024/2/18 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q2\",\"JCRName\":\"ONCOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Hyperthermia","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1080/02656736.2024.2313492","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/2/18 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"ONCOLOGY","Score":null,"Total":0}
Directional microwave ablation in spine: experimental assessment of computational modeling.
Background: Despite the theoretical advantages of treating metastatic bone disease with microwave ablation (MWA), there are few reports characterizing microwave absorption and bioheat transfer in bone. This report describes a computational modeling-based approach to simulate directional microwave ablation (dMWA) in spine, supported by ex vivo and pilot in vivo experiments in porcine vertebral bodies.
Materials and methods: A 3D computational model of microwave ablation within porcine vertebral bodies was developed. Ex vivo porcine vertebra experiments using a dMWA applicator measured temperatures approximately 10.1 mm radially from the applicator in the direction of MW radiation (T1) and approximately 2.4 mm in the contra-lateral direction (T2). Histologic assessment of ablated ex vivo tissue was conducted and experimental results compared to simulations. Pilot in vivo experiments in porcine vertebral bodies assessed ablation zones histologically and with CT and MRI.
Results: Experimental T1 and T2 temperatures were within 3-7% and 11-33% of simulated temperature values. Visible ablation zones, as indicated by grayed tissue, were smaller than those typical in other soft tissues. Posthumous MRI images of in vivo ablations showed hyperintensity. In vivo experiments illustrated the technical feasibility of creating directional microwave ablation zones in porcine vertebral body.
Conclusion: Computational models and experimental studies illustrate the feasibility of controlled dMWA in bone tissue.