{"id":12794,"date":"2025-07-31T10:49:12","date_gmt":"2025-07-31T14:49:12","guid":{"rendered":"https:\/\/www.rigicon.com\/glossary-term\/magnetic-resonance-imaging\/"},"modified":"2025-07-31T10:49:12","modified_gmt":"2025-07-31T14:49:12","slug":"ressonancia-magnetica","status":"publish","type":"glossary-term","link":"https:\/\/www.rigicon.com\/pt-br\/glossary-term\/ressonancia-magnetica\/","title":{"rendered":"Resson\u00e2ncia Magn\u00e9tica"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"","protected":false},"featured_media":0,"template":"","glossary-category":[109],"glossary-product":[],"class_list":["post-12794","glossary-term","type-glossary-term","status-publish","hentry","glossary-category-diagnostic-phenomena"],"acf":{"gt-definition":"<p>A resson\u00e2ncia magn\u00e9tica (MRI) \u00e9 uma t\u00e9cnica de imagem m\u00e9dica n\u00e3o invasiva que utiliza poderosos campos magn\u00e9ticos e ondas de r\u00e1dio geradas por computador para criar imagens tridimensionais detalhadas dos \u00f3rg\u00e3os e tecidos do corpo.<sup>1<\/sup> A tecnologia funciona explorando as propriedades magn\u00e9ticas naturais dos \u00e1tomos de hidrog\u00eanio encontrados abundantemente nas mol\u00e9culas de \u00e1gua em todos os tecidos do corpo.<sup>2<\/sup> Quando colocados dentro do forte campo magn\u00e9tico de uma m\u00e1quina de resson\u00e2ncia magn\u00e9tica, esses pr\u00f3tons de hidrog\u00eanio se alinham com o campo. Uma corrente de radiofrequ\u00eancia \u00e9 ent\u00e3o pulsada atrav\u00e9s do paciente, fazendo com que os pr\u00f3tons girem fora do equil\u00edbrio. \u00c0 medida que se realinham com o campo magn\u00e9tico ap\u00f3s o desligamento da radiofrequ\u00eancia, eles liberam energia que \u00e9 detectada por sensores especializados.<sup>3<\/sup> O tempo que leva para os pr\u00f3tons se realinharem e a quantidade de energia liberada variam dependendo do ambiente do tecido, permitindo aos m\u00e9dicos diferenciar entre v\u00e1rios tipos de tecidos com base nessas propriedades magn\u00e9ticas.<sup>4<\/sup> A resson\u00e2ncia magn\u00e9tica \u00e9 amplamente utilizada para detec\u00e7\u00e3o de doen\u00e7as, diagn\u00f3stico e monitoramento de tratamento, fornecendo contraste excepcional de tecidos moles sem expor os pacientes a radia\u00e7\u00e3o ionizante.<sup>5<\/sup><\/p>\n<p>A resson\u00e2ncia magn\u00e9tica (RM) \u00e9 uma t\u00e9cnica de imagem que utiliza campos magn\u00e9ticos para produzir imagens detalhadas dos tecidos moles. Na urologia, a RM multiparam\u00e9trica da pr\u00f3stata (RMmp) tornou-se ferramenta essencial no diagn\u00f3stico do c\u00e2ncer de pr\u00f3stata, combinando sequ\u00eancias T2, difus\u00e3o (DWI) e contraste din\u00e2mico (DCE) para classifica\u00e7\u00e3o PI-RADS.<\/p>","gt-synonyms":"Resson\u00e2ncia magn\u00e9tica, imagem por resson\u00e2ncia magn\u00e9tica nuclear (termo hist\u00f3rico), imagem por resson\u00e2ncia magn\u00e9tica, tomografia por resson\u00e2ncia magn\u00e9tica, imagem por resson\u00e2ncia magn\u00e9tica, fMRI (imagem por resson\u00e2ncia magn\u00e9tica funcional - tipo especializado)","gt-citation":"[1] Grover VPB, Tognarelli JM, Crossey MME, Cox IJ, Taylor-Robinson SD, McPhail MJW. Magnetic Resonance Imaging: Principles and Techniques: Lessons for Clinicians. J Clin Exp Hepatol. 2015;5(3):246-255. doi:10.1016\/j.jceh.2015.08.001\n\n[2] Wu C, Dougherty JD, Harms MP, et al. Clinical applications of magnetic resonance imaging based functional and structural connectomics in epilepsy. Neuroimage. 2022;244:118649. doi:10.1016\/j.neuroimage.2021.118649\n\n[3] National Institute of Biomedical Imaging and Bioengineering. Magnetic Resonance Imaging (MRI). https:\/\/www.nibib.nih.gov\/science-education\/science-topics\/magnetic-resonance-imaging-mri\n\n[4] Mayo Clinic. MRI. https:\/\/www.mayoclinic.org\/tests-procedures\/mri\/about\/pac-20384768\n\n[5] Berger A. Magnetic resonance imaging. BMJ. 2002;324(7328):35. doi:10.1136\/bmj.324.7328.35","gt-clinical-context":"<p>A resson\u00e2ncia magn\u00e9tica \u00e9 empregada em diversas especialidades m\u00e9dicas devido \u00e0 sua excepcional capacidade de visualizar tecidos moles com alta resolu\u00e7\u00e3o e contraste.<sup>1<\/sup> Ao contr\u00e1rio da tomografia computadorizada (TC) ou dos raios X convencionais, a resson\u00e2ncia magn\u00e9tica n\u00e3o utiliza radia\u00e7\u00e3o ionizante, o que a torna particularmente valiosa para pacientes que necessitam de exames de imagem frequentes ou aqueles mais vulner\u00e1veis aos efeitos da radia\u00e7\u00e3o, como mulheres gr\u00e1vidas e crian\u00e7as.<sup>3<\/sup><\/p>\n <p>A resson\u00e2ncia magn\u00e9tica \u00e9 a modalidade de imagem de escolha para condi\u00e7\u00f5es neurol\u00f3gicas, pois pode diferenciar entre a subst\u00e2ncia branca e cinzenta no c\u00e9rebro e detectar anormalidades sutis, como doen\u00e7as desmielinizantes, pequenos tumores e malforma\u00e7\u00f5es vasculares.<sup>2<\/sup> \u00c9 amplamente utilizada no diagn\u00f3stico e monitoramento de esclerose m\u00faltipla, tumores cerebrais, acidente vascular cerebral e dist\u00farbios neurodegenerativos.<sup>4<\/sup> A resson\u00e2ncia magn\u00e9tica funcional (fMRI), uma aplica\u00e7\u00e3o especializada, mede o sangue. mudan\u00e7as de fluxo no c\u00e9rebro para mapear \u00e1reas ativadas durante tarefas cognitivas espec\u00edficas, fornecendo informa\u00e7\u00f5es valiosas para planejamento neurocir\u00fargico e pesquisa neurol\u00f3gica.<sup>3<\/sup><\/p>\n <p>Na medicina musculoesquel\u00e9tica, a resson\u00e2ncia magn\u00e9tica \u00e9 excelente na visualiza\u00e7\u00e3o de estruturas de tecidos moles, incluindo ligamentos, tend\u00f5es, cartilagens e m\u00fasculos, tornando-a inestim\u00e1vel para o diagn\u00f3stico de les\u00f5es esportivas, condi\u00e7\u00f5es articulares degenerativas e dist\u00farbios da coluna vertebral.<sup>4<\/sup> Para les\u00f5es de joelho e ombro, a resson\u00e2ncia magn\u00e9tica fornece visualiza\u00e7\u00e3o detalhada de rupturas meniscais, les\u00f5es do manguito rotador e danos nos ligamentos que podem ser indetect\u00e1veis com outras imagens. m\u00e9todos.<sup>3<\/sup><\/p>\n <p>A resson\u00e2ncia magn\u00e9tica cardiovascular permite a avalia\u00e7\u00e3o da estrutura, fun\u00e7\u00e3o e fluxo sangu\u00edneo card\u00edaco, auxiliando no diagn\u00f3stico de defeitos card\u00edacos cong\u00eanitos, cardiomiopatias e doen\u00e7as vasculares.<sup>4<\/sup> Em oncologia, a resson\u00e2ncia magn\u00e9tica auxilia na detec\u00e7\u00e3o, caracteriza\u00e7\u00e3o, estadiamento e monitoramento da resposta ao tratamento de tumores em v\u00e1rios sistemas org\u00e2nicos.<sup>1<\/sup><\/p>\n <p>A sele\u00e7\u00e3o de pacientes para resson\u00e2ncia magn\u00e9tica considera v\u00e1rios fatores, incluindo a quest\u00e3o cl\u00ednica a ser abordada, a necessidade de contraste superior dos tecidos moles, preocupa\u00e7\u00f5es com a exposi\u00e7\u00e3o \u00e0 radia\u00e7\u00e3o e contra-indica\u00e7\u00f5es, como certos dispositivos m\u00e9dicos implantados ou claustrofobia grave.<sup>5<\/sup> O procedimento normalmente leva de 15 a 60 minutos, dependendo da parte do corpo que est\u00e1 sendo fotografada e dos protocolos espec\u00edficos usados.<sup>4<\/sup><\/p>\n<p>A EAU 2023 recomenda RMmp antes da bi\u00f3psia em homens com suspeita de c\u00e2ncer de pr\u00f3stata (PSA elevado), melhorando a detec\u00e7\u00e3o de tumores clinicamente significativos e reduzindo bi\u00f3psias desnecess\u00e1rias. PI-RADS \u2265 3 indica necessidade de bi\u00f3psia com fus\u00e3o RM-US. A RM tamb\u00e9m \u00e9 utilizada no estadiamento de tumores renais, c\u00e2ncer de bexiga e avalia\u00e7\u00e3o de massas escrotais indeterminadas \u00e0 ultrassonografia.<\/p>","gt-related-evidence":null,"gt-featured":true,"gt-ai-referenced":false,"gt-view-count":138},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Resson\u00e2ncia Magn\u00e9tica na Urologia | Rigicon<\/title>\n<meta name=\"description\" content=\"Saiba sobre o uso da resson\u00e2ncia magn\u00e9tica na urologia: RM multiparam\u00e9trica da pr\u00f3stata, estadiamento renal e avalia\u00e7\u00e3o p\u00e9lvica. Indica\u00e7\u00f5es. 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