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Current techniques for noncontact temperature mapping during hyperthermia are restricted to 2D imaging, due to the lack of strategies able to provide images in suitable time frames for the inevitable large amount of information encompassed in 3D tomography. Iron selenide nanoparticles (NPs) are developed with high temperature sensitivity that, in combination with low\u2010field magnetic resonance imaging, enable 3D temperature imaging in the \u224820\u2009s time frame. This approach is suitable for monitoring and evaluating photothermal therapy applied to cellular assemblies, which typically occurs over a time frame of tens of minutes. In addition, iron selenide NPs behave, simultaneously, as photothermal and thermometric agents embedded in cellular models at concentrations where their cytotoxicity is low. This dual functionality enables to control the depth achieved by the therapy with a temperature accuracy \u22641\u2009\u00b0C, enabling the detection and control of hot spots that would be otherwise overlooked. Overall, this is a universal approach for temperature mapping in 3D and for localized heating in virtually any living tissue.<\/jats:p>","DOI":"10.1002\/sstr.202400658","type":"journal-article","created":{"date-parts":[[2025,5,24]],"date-time":"2025-05-24T04:34:47Z","timestamp":1748061287000},"source":"Crossref","is-referenced-by-count":0,"title":["3D Temperature Mapping During Photothermal Therapy in Cellular Assemblies"],"prefix":"10.1002","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3140-3542","authenticated-orcid":false,"given":"Joana F.","family":"Soeiro","sequence":"first","affiliation":[{"name":"Department of Physics and CICECO \u2010 Aveiro Institute of Materials University of Aveiro  Campus Universit\u00e1rio de Santiago 3810\u2010193 Aveiro Portugal"},{"name":"Department of Chemistry and CICECO \u2010 Aveiro Institute of Materials University of Aveiro  Campus Universit\u00e1rio de Santiago 3810\u2010193 Aveiro Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4661-7407","authenticated-orcid":false,"given":"Rute A.","family":"Pereira","sequence":"additional","affiliation":[{"name":"Department of Physics and CICECO \u2010 Aveiro Institute of Materials University of Aveiro  Campus Universit\u00e1rio de Santiago 3810\u2010193 Aveiro Portugal"},{"name":"Department of Chemistry and CICECO \u2010 Aveiro Institute of Materials University of Aveiro  Campus Universit\u00e1rio de Santiago 3810\u2010193 Aveiro Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6172-0413","authenticated-orcid":false,"given":"Rui","family":"Oliveira\u2010Silva","sequence":"additional","affiliation":[{"name":"Department of Physics and CICECO \u2010 Aveiro Institute of Materials University of Aveiro  Campus Universit\u00e1rio de Santiago 3810\u2010193 Aveiro Portugal"},{"name":"Department of Chemistry and CICECO \u2010 Aveiro Institute of Materials University of Aveiro  Campus Universit\u00e1rio de Santiago 3810\u2010193 Aveiro Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5674-8120","authenticated-orcid":false,"given":"Filipa L.","family":"Sousa","sequence":"additional","affiliation":[{"name":"Department of Chemistry and CICECO \u2010 Aveiro Institute of Materials University of Aveiro  Campus Universit\u00e1rio de Santiago 3810\u2010193 Aveiro Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0372-2493","authenticated-orcid":false,"given":"V\u00edtor M.","family":"Gaspar","sequence":"additional","affiliation":[{"name":"Department of Chemistry and CICECO \u2010 Aveiro Institute of Materials University of Aveiro  Campus Universit\u00e1rio de Santiago 3810\u2010193 Aveiro Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2342-3765","authenticated-orcid":false,"given":"Jo\u00e3o F.","family":"Mano","sequence":"additional","affiliation":[{"name":"Department of Chemistry and CICECO \u2010 Aveiro Institute of Materials University of Aveiro  Campus Universit\u00e1rio de Santiago 3810\u2010193 Aveiro Portugal"}]},{"given":"\u00c1ngel","family":"Mill\u00e1n","sequence":"additional","affiliation":[{"name":"Institute of Nanoscience and Materials of Aragon (INMA) CSIC\u2010University of Zaragoza  Zaragoza 50009 Spain"}]},{"given":"Claudia","family":"Innocenti","sequence":"additional","affiliation":[{"name":"Dipartimento di Chimica Universit\u00e0 di Firenze and INSTM  50019 Sesto Fiorentino (FI) Italy"},{"name":"ICCOM\u2010CNR  50019 Sesto Fiorentino (FI) Italy"}]},{"given":"Manuel","family":"Mariani","sequence":"additional","affiliation":[{"name":"Department of Physics University of Pavia  27100 Pavia Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1687-0436","authenticated-orcid":false,"given":"Alessandro","family":"Lascialfari","sequence":"additional","affiliation":[{"name":"Department of Physics University of Pavia  27100 Pavia Italy"},{"name":"INFN, Istituto Nazionale di Fisica Nucleare  27100 Pavia Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2260-1192","authenticated-orcid":false,"given":"Nuno J. 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