Dielectric properties of colon polyps, cancer, and normal mucosa: Ex vivo measurements from 0.5 to 20 GHz
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- dc.contributor.author Guardiola, Marta
- dc.contributor.author Buitrago, Santiago
- dc.contributor.author Fernández-Esparrach, Gloria
- dc.contributor.author O’Callaghan, Joan M.
- dc.contributor.author Romeu, Jordi
- dc.contributor.author Cuatrecasas, Miriam
- dc.contributor.author Córdova, Henry
- dc.contributor.author González Ballester, Miguel Ángel, 1973-
- dc.contributor.author Camara, Oscar
- dc.date.accessioned 2023-05-02T06:19:35Z
- dc.date.available 2023-05-02T06:19:35Z
- dc.date.issued 2018
- dc.description.abstract Purpose: Colorectal cancer is highly preventable by detecting and removing polyps, which are the precursors. Currently, the most accurate test is colonoscopy, but still misses 22% of polyps due to visualization limitations. In this paper, we preliminary assess the potential of microwave imaging and dielectric properties (e.g., complex permittivity) as a complementary method for detecting polyps and cancer tissue in the colon. The dielectric properties of biological tissues have been used in a wide variety of applications, including safety assessment of wireless technologies and design of medical diagnostic or therapeutic techniques (microwave imaging, hyperthermia, and ablation). The main purpose of this work is to measure the complex permittivity of different types of colon polyps, cancer, and normal mucosa in ex vivo human samples to study if the dielectric properties are appropriate for classification purposes. Methods: The complex permittivity of freshly excised healthy colon tissue, cancer, and histological samples of different types of polyps from 23 patients was characterized using an open-ended coaxial probe between 0.5 and 20 GHz. The obtained measurements were classified into five tissue groups before applying a data reduction step with a frequency dispersive single-pole Debye model. The classification was finally compared with pathological analysis of tissue samples, which is the gold standard. Results: The complex permittivity progressively increases as the tissue degenerates from normal to cancer. When comparing to the gold-standard histological tissue analysis, the sensitivity and specificity of the proposed method is the following: 100% and 95% for cancer diagnosis; 91% and 62% for adenomas with high-grade dysplasia; 100% and 61% for adenomas with low-grade dysplasia; and 100% and 74% for hyperplastic polyps, respectively. In addition, complex permittivity measurements were independent of the lesion shape and size, which is also an interesting property comparing to current colonoscopy techniques. Conclusions: The contrast in complex permittivities between normal and abnormal colon tissues presented here for the first time demonstrate the potential of these measurements for tissue classification. It also opens the door to the development of a microwave endoscopic device to complement the outcomes of colonoscopy with functional tissue information.
- dc.description.sponsorship This work was supported by the Department of Universitats, Recerca i Societat de la Informacio of the Catalan Government through Llavor 2014LLAV00016 and producte 2016PROD00068 projects, La Caixa through Caixaimpulse program CI16-00058, the Spanish Comision Interministerial de Ciencia y Tecnologıa (CICYT) under projects TEC2016- 78028-C3-1-P, TEC2014-58582-R, the Spanish Agencia Estatal de Investigacion Unidad de Excelencia Maria de Maeztu (MDM-2016-0600), the Spanish Ministerio de Economıa, Industria y Competitividad, DTS17/00090 and CERCA Programme/Generalitat de Catalunya.
- dc.format.mimetype application/pdf
- dc.identifier.citation Guardiola M, Buitrago S, Fernández-Esparrach G, O'Callaghan JM, Romeu J, Cuatrecasas M, Córdova H, González Ballester MA, Camara O. Dielectric properties of colon polyps, cancer, and normal mucosa: Ex vivo measurements from 0.5 to 20 GHz. Med Phys. 2018;45(8):3768-82. DOI: 10.1002/mp.13016
- dc.identifier.doi http://dx.doi.org/10.1002/mp.13016
- dc.identifier.issn 0094-2405
- dc.identifier.uri http://hdl.handle.net/10230/56634
- dc.language.iso eng
- dc.publisher American Association of Physicists in Medicine (AAPM)
- dc.relation.ispartof Medical Physics. 2018;45(8):3768-82.
- dc.relation.projectID info:eu-repo/grantAgreement/ES/1PE/TEC2016-78028-C3-1-P
- dc.relation.projectID info:eu-repo/grantAgreement/ES/1PE/TEC2014-58582-R
- dc.relation.projectID info:eu-repo/grantAgreement/ES/1PE/MDM-2016-0600
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- dc.rights.accessRights info:eu-repo/semantics/openAccess
- dc.subject.keyword colorectal cancer
- dc.subject.keyword Debye model
- dc.subject.keyword dielectric characterization
- dc.subject.keyword ex vivo tissues
- dc.subject.keyword microwave imaging
- dc.title Dielectric properties of colon polyps, cancer, and normal mucosa: Ex vivo measurements from 0.5 to 20 GHz
- dc.type info:eu-repo/semantics/article
- dc.type.version info:eu-repo/semantics/acceptedVersion