{"id":5757,"date":"2026-02-02T13:48:52","date_gmt":"2026-02-02T13:48:52","guid":{"rendered":"https:\/\/www.impc.fr\/?page_id=5757"},"modified":"2026-02-02T13:48:53","modified_gmt":"2026-02-02T13:48:53","slug":"difference-entre-un-scanner-et-une-irm","status":"publish","type":"page","link":"https:\/\/www.impc.fr\/en\/difference-entre-un-scanner-et-une-irm\/","title":{"rendered":"Diff\u00e9rence entre un scanner et une IRM"},"content":{"rendered":"

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Diff\u00e9rence entre un scanner et une IRM<\/h1>\n

Comprendre pour mieux choisir<\/p>\n

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Prenez rendez-vous dans nos centres<\/p>\n

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Prise de rendez-vous – Paris 75002<\/p>\n

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Prise de rendez-vous – Paris 75009 Drouot<\/p>\n

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Prise de rendez-vous – Paris 75015<\/p>\n

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Prise de rendez-vous – Paris 75009 Berg\u00e8re<\/p>\n

[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_2″ _builder_version=\u00a0\u00bb4.16″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb80px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb custom_padding__hover=\u00a0\u00bb|||\u00a0\u00bb][et_pb_image src=\u00a0\u00bbhttps:\/\/www.impc.fr\/wp-content\/uploads\/2025\/06\/shutterstock_2002956662-scaled.jpg\u00a0\u00bb alt=\u00a0\u00bbinfiltration du dos \u00e0 Paris\u00a0\u00bb title_text=\u00a0\u00bbinfiltration du dos\u00a0\u00bb disabled_on=\u00a0\u00bbon|on|off\u00a0\u00bb _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb100%\u00a0\u00bb custom_margin=\u00a0\u00bb-61px||||false|false\u00a0\u00bb custom_margin_tablet=\u00a0\u00bb110px||||false|false\u00a0\u00bb custom_margin_phone=\u00a0\u00bb0px||||false|false\u00a0\u00bb custom_margin_last_edited=\u00a0\u00bbon|desktop\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=\u00a0\u00bb1″ custom_padding_last_edited=\u00a0\u00bbon|phone\u00a0\u00bb _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb5px||8px||false|false\u00a0\u00bb custom_padding_tablet=\u00a0\u00bb49px||||false|false\u00a0\u00bb custom_padding_phone=\u00a0\u00bb0px||||false|false\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row column_structure=\u00a0\u00bb1_2,1_2″ use_custom_gutter=\u00a0\u00bbon\u00a0\u00bb gutter_width=\u00a0\u00bb2″ custom_padding_last_edited=\u00a0\u00bbon|phone\u00a0\u00bb _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb70%\u00a0\u00bb width_tablet=\u00a0\u00bb92%\u00a0\u00bb width_phone=\u00a0\u00bb94%\u00a0\u00bb width_last_edited=\u00a0\u00bbon|phone\u00a0\u00bb max_width=\u00a0\u00bb100%\u00a0\u00bb custom_margin_tablet=\u00a0\u00bb\u00a0\u00bb custom_margin_phone=\u00a0\u00bb-40px||0px||false|false\u00a0\u00bb custom_margin_last_edited=\u00a0\u00bbon|phone\u00a0\u00bb custom_padding=\u00a0\u00bb|||15px|false|false\u00a0\u00bb custom_padding_tablet=\u00a0\u00bb|||15px|false|false\u00a0\u00bb custom_padding_phone=\u00a0\u00bb|||0px|false|false\u00a0\u00bb make_fullwidth=\u00a0\u00bbon\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb1_2″ _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb|0px||0px|false|false\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb custom_padding__hover=\u00a0\u00bb|||\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.27.5″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_font=\u00a0\u00bb–et_global_body_font||||||||\u00a0\u00bb text_text_color=\u00a0\u00bb#000000″ text_font_size=\u00a0\u00bb15px\u00a0\u00bb header_2_font=\u00a0\u00bb–et_global_heading_font|600|||||||\u00a0\u00bb header_2_font_size=\u00a0\u00bb21px\u00a0\u00bb header_2_line_height=\u00a0\u00bb1.4em\u00a0\u00bb header_3_font=\u00a0\u00bb–et_global_heading_font|600|||on|||#007BFF|\u00a0\u00bb header_3_text_color=\u00a0\u00bb#007BFF\u00a0\u00bb header_3_font_size=\u00a0\u00bb17px\u00a0\u00bb background_color=\u00a0\u00bb#fcfcfc\u00a0\u00bb min_height=\u00a0\u00bb104px\u00a0\u00bb custom_margin=\u00a0\u00bb||3px|||\u00a0\u00bb custom_padding=\u00a0\u00bb14px|18px|14px|18px|true|true\u00a0\u00bb hover_enabled=\u00a0\u00bb0″ header_2_font_size_tablet=\u00a0\u00bb21px\u00a0\u00bb header_2_font_size_phone=\u00a0\u00bb19px\u00a0\u00bb header_2_font_size_last_edited=\u00a0\u00bbon|phone\u00a0\u00bb border_radii=\u00a0\u00bbon|12px|12px|12px|12px\u00a0\u00bb border_color_right=\u00a0\u00bb#a3a3a3″ box_shadow_style=\u00a0\u00bbpreset1″ box_shadow_vertical=\u00a0\u00bb1px\u00a0\u00bb box_shadow_blur=\u00a0\u00bb10px\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb sticky_enabled=\u00a0\u00bb0″]<\/p>\n

Scanner et IRM : deux techniques d\u2019imagerie diff\u00e9rentes<\/h2>\n

Qu\u2019est-ce qu\u2019un scanner ?<\/h3>\n

Le scanner, aussi appel\u00e9 tomodensitom\u00e9trie (TDM)<\/strong>, utilise les rayons X<\/strong> pour produire des images en coupes fines du corps.
Ces images sont ensuite reconstruites par ordinateur afin d\u2019obtenir une visualisation pr\u00e9cise des organes, des os et de certains tissus.<\/p>\n

Le scanner est particuli\u00e8rement appr\u00e9ci\u00e9 pour sa rapidit\u00e9<\/strong> et son efficacit\u00e9 en situation d\u2019urgence.<\/p>\n

Qu\u2019est-ce qu\u2019une IRM ?<\/h3>\n

L\u2019IRM repose sur un champ magn\u00e9tique puissant<\/strong> et des ondes radio<\/strong>, sans utiliser de rayons X.
Elle permet d\u2019obtenir des images tr\u00e8s d\u00e9taill\u00e9es des tissus mous<\/strong>, comme le cerveau, la moelle \u00e9pini\u00e8re, les muscles, les ligaments ou les organes pelviens.<\/p>\n

L\u2019IRM est souvent choisie lorsque l\u2019on recherche une analyse fine et approfondie<\/strong>.<\/p>\n

Quelle est la principale diff\u00e9rence entre un scanner et une IRM ?<\/h2>\n

La diff\u00e9rence fondamentale r\u00e9side dans la technologie utilis\u00e9e<\/strong> :<\/p>\n

    \n
  • \n

    Le scanner<\/strong> utilise des rayons X<\/strong>.<\/p>\n<\/li>\n

  • \n

    L\u2019IRM<\/strong> utilise un champ magn\u00e9tique<\/strong>, sans irradiation.<\/p>\n<\/li>\n<\/ul>\n

    Cette distinction entra\u00eene des diff\u00e9rences importantes en termes d\u2019indications, de dur\u00e9e, de confort et de s\u00e9curit\u00e9.<\/p>\n

    Dans quels cas utilise-t-on un scanner ?<\/h2>\n

    Le scanner est souvent prescrit lorsque l\u2019on a besoin d\u2019un r\u00e9sultat rapide<\/strong> ou d\u2019une bonne visualisation des structures denses.<\/p>\n

    Il est notamment utilis\u00e9 pour :<\/p>\n

      \n
    • \n

      les urgences m\u00e9dicales<\/strong> (AVC, traumatisme cr\u00e2nien, accident),<\/p>\n<\/li>\n

    • \n

      la recherche d\u2019une h\u00e9morragie<\/strong>,<\/p>\n<\/li>\n

    • \n

      l\u2019exploration des poumons<\/strong>, du thorax et de l\u2019abdomen,<\/p>\n<\/li>\n

    • \n

      l\u2019analyse des os et fractures<\/strong>,<\/p>\n<\/li>\n

    • \n

      certains bilans oncologiques.<\/p>\n<\/li>\n<\/ul>\n

      Gr\u00e2ce \u00e0 sa rapidit\u00e9, le scanner est souvent l\u2019examen de premi\u00e8re intention<\/strong>.<\/p>\n

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      \n
      \n
      \n

      Dans quels cas privil\u00e9gie-t-on une IRM ?<\/h3>\n

      L\u2019IRM est indiqu\u00e9e lorsque l\u2019on souhaite une analyse tr\u00e8s pr\u00e9cise des tissus mous<\/strong>.<\/p>\n

      Elle est particuli\u00e8rement adapt\u00e9e pour :<\/p>\n

        \n
      • \n

        le cerveau et la moelle \u00e9pini\u00e8re<\/strong>,<\/p>\n<\/li>\n

      • \n

        les articulations<\/strong> (genou, \u00e9paule, hanche),<\/p>\n<\/li>\n

      • \n

        les muscles, tendons et ligaments<\/strong>,<\/p>\n<\/li>\n

      • \n

        le bassin et les organes gyn\u00e9cologiques<\/strong>,<\/p>\n<\/li>\n

      • \n

        certaines pathologies tumorales complexes.<\/p>\n<\/li>\n<\/ul>\n

        L\u2019IRM est souvent prescrite en compl\u00e9ment du scanner<\/strong> ou lorsque celui-ci ne suffit pas.<\/p>\n

        Scanner ou IRM : lequel est le plus rapide ?<\/h3>\n

        La dur\u00e9e constitue une diff\u00e9rence notable :<\/p>\n

          \n
        • \n

          Scanner<\/strong> : 5 \u00e0 15 minutes en moyenne.<\/p>\n<\/li>\n

        • \n

          IRM<\/strong> : 20 \u00e0 45 minutes selon la zone \u00e9tudi\u00e9e.<\/p>\n<\/li>\n<\/ul>\n

          Ainsi, lorsque le temps est un facteur cl\u00e9 \u2014 notamment en urgence \u2014 le scanner est privil\u00e9gi\u00e9.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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          Scanner ou IRM : lequel est le meilleur ?<\/h3>\n

          Il n\u2019existe pas de \u00ab meilleur \u00bb examen en soi.
          Le scanner et l\u2019IRM sont compl\u00e9mentaires<\/strong>, et le choix d\u00e9pend :<\/p>\n

            \n
          • \n

            de la zone \u00e0 explorer<\/strong>,<\/p>\n<\/li>\n

          • \n

            de la pathologie suspect\u00e9e<\/strong>,<\/p>\n<\/li>\n

          • \n

            de l\u2019urgence m\u00e9dicale<\/strong>,<\/p>\n<\/li>\n

          • \n

            du profil du patient<\/strong>.<\/p>\n<\/li>\n<\/ul>\n

            Le m\u00e9decin prescripteur et le radiologue choisissent l\u2019examen le plus pertinent pour r\u00e9pondre \u00e0 la question clinique.<\/p>\n

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            S\u00e9curit\u00e9 et risques : quelles diff\u00e9rences ?<\/h2>\n

            Le scanner est-il dangereux ?<\/h3>\n

            Le scanner utilise des rayons X<\/strong>, ce qui implique une exposition aux radiations.
            Cependant, les doses sont strictement contr\u00f4l\u00e9es<\/strong> et adapt\u00e9es \u00e0 chaque patient. Selon la Haute Autorit\u00e9 de Sant\u00e9, le b\u00e9n\u00e9fice diagnostique est largement sup\u00e9rieur au risque<\/strong>, qui reste tr\u00e8s faible.<\/p>\n

            L\u2019IRM est-elle plus s\u00fbre ?<\/h3>\n

            L\u2019IRM n\u2019utilise aucun rayonnement ionisant<\/strong>, ce qui en fait un examen particuli\u00e8rement s\u00fbr.
            Toutefois, elle est contre-indiqu\u00e9e<\/strong> chez certains patients porteurs de :<\/p>\n

              \n
            • \n

              pacemakers non compatibles,<\/p>\n<\/li>\n

            • \n

              implants m\u00e9talliques,<\/p>\n<\/li>\n

            • \n

              corps \u00e9trangers m\u00e9talliques.<\/p>\n<\/li>\n<\/ul>\n

              Un questionnaire de s\u00e9curit\u00e9 est syst\u00e9matiquement r\u00e9alis\u00e9 avant l\u2019examen.<\/p>\n

              Confort du patient : scanner vs IRM<\/h3>\n
                \n
              • \n

                Le scanner<\/strong> est court et peu contraignant.<\/p>\n<\/li>\n

              • \n

                L\u2019IRM<\/strong> est plus longue et peut \u00eatre inconfortable pour les personnes claustrophobes, en raison du tunnel \u00e9troit et du bruit.<\/p>\n<\/li>\n<\/ul>\n

                Des solutions existent pour am\u00e9liorer le confort en IRM, comme les casques anti-bruit ou un accompagnement renforc\u00e9.<\/p>\n

                Scanner ou IRM : faut-il une injection ?<\/h3>\n

                Les deux examens peuvent \u00eatre r\u00e9alis\u00e9s avec ou sans injection de produit de contraste<\/strong>.<\/p>\n

                  \n
                • \n

                  Scanner avec injection<\/strong> : produit iod\u00e9, utile pour visualiser les vaisseaux et certaines l\u00e9sions.<\/p>\n<\/li>\n

                • \n

                  IRM avec injection<\/strong> : produit \u00e0 base de gadolinium, utilis\u00e9 pour am\u00e9liorer le contraste des tissus.<\/p>\n<\/li>\n<\/ul>\n

                  L\u2019injection n\u2019est pas syst\u00e9matique et d\u00e9pend de la question clinique pos\u00e9e<\/strong>.<\/p>\n

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                  Tableau comparatif : scanner ou IRM ?<\/h3>\n
                  \n
                  \n\n\n\n\n\n\n\n\n\n\n\n
                  Crit\u00e8re<\/th>\nScanner<\/th>\nIRM<\/th>\n<\/tr>\n<\/thead>\n
                  Technologie<\/td>\nRayons X<\/td>\nChamp magn\u00e9tique<\/td>\n<\/tr>\n
                  Rayonnements<\/td>\nOui<\/td>\nNon<\/td>\n<\/tr>\n
                  Dur\u00e9e<\/td>\n5\u201315 min<\/td>\n20\u201345 min<\/td>\n<\/tr>\n
                  Urgence<\/td>\nTr\u00e8s adapt\u00e9<\/td>\nMoins adapt\u00e9<\/td>\n<\/tr>\n
                  Tissus mous<\/td>\nMoyenne<\/td>\nExcellente<\/td>\n<\/tr>\n
                  Os<\/td>\nExcellente<\/td>\nLimit\u00e9e<\/td>\n<\/tr>\n
                  Bruit<\/td>\nFaible<\/td>\nImportant<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

                  \u00a0\u00bb content_phone=\u00a0\u00bb<\/p>\n

                  Tableau comparatif : scanner ou IRM ?<\/h3>\n
                  \n
                  \n\n\n\n\n\n\n\n\n\n\n\n
                  Crit\u00e8re<\/th>\nScanner<\/th>\nIRM<\/th>\n<\/tr>\n<\/thead>\n
                  Technologie<\/td>\nRayons X<\/td>\nChamp magn\u00e9tique<\/td>\n<\/tr>\n
                  Rayonnements<\/td>\nOui<\/td>\nNon<\/td>\n<\/tr>\n
                  Dur\u00e9e<\/td>\n5\u201315 min<\/td>\n20\u201345 min<\/td>\n<\/tr>\n
                  Urgence<\/td>\nTr\u00e8s adapt\u00e9<\/td>\nMoins adapt\u00e9<\/td>\n<\/tr>\n
                  Tissus mous<\/td>\nMoyenne<\/td>\nExcellente<\/td>\n<\/tr>\n
                  Os<\/td>\nExcellente<\/td>\nLimit\u00e9e<\/td>\n<\/tr>\n
                  Bruit<\/td>\nFaible<\/td>\nImportant<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

                  \u00a0\u00bb text_font_size_tablet=\u00a0\u00bb15px\u00a0\u00bb]<\/p>\n

                  Tableau comparatif : scanner ou IRM ?<\/h3>\n
                  \n
                  \n\n\n\n\n\n\n\n\n\n\n\n
                  Crit\u00e8re<\/th>\nScanner<\/th>\nIRM<\/th>\n<\/tr>\n<\/thead>\n
                  Technologie<\/td>\nRayons X<\/td>\nChamp magn\u00e9tique<\/td>\n<\/tr>\n
                  Rayonnements<\/td>\nOui<\/td>\nNon<\/td>\n<\/tr>\n
                  Dur\u00e9e<\/td>\n5\u201315 min<\/td>\n20\u201345 min<\/td>\n<\/tr>\n
                  Urgence<\/td>\nTr\u00e8s adapt\u00e9<\/td>\nMoins adapt\u00e9<\/td>\n<\/tr>\n
                  Tissus mous<\/td>\nMoyenne<\/td>\nExcellente<\/td>\n<\/tr>\n
                  Os<\/td>\nExcellente<\/td>\nLimit\u00e9e<\/td>\n<\/tr>\n
                  Bruit<\/td>\nFaible<\/td>\nImportant<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

                  [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"

                  Diff\u00e9rence entre un scanner et une IRM Comprendre pour mieux choisirPrenez rendez-vous dans nos centresPrise de rendez-vous – Paris 75002Prise de rendez-vous – Paris 75009 DrouotPrise de rendez-vous – Paris 75015Prise de rendez-vous – Paris 75009 Berg\u00e8reScanner et IRM : deux techniques d\u2019imagerie diff\u00e9rentes Qu\u2019est-ce qu\u2019un scanner ? Le scanner, aussi appel\u00e9 tomodensitom\u00e9trie (TDM), utilise […]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-5757","page","type-page","status-publish","hentry"],"yoast_head":"\nDiff\u00e9rence entre un scanner et une IRM - Groupe IMPC - Imagerie M\u00e9dicale<\/title>\n<meta name=\"description\" content=\"Quelle est la diff\u00e9rence entre un scanner et une IRM ? 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