{"id":4694,"date":"2011-10-25T14:58:54","date_gmt":"2011-10-25T13:58:54","guid":{"rendered":"http:\/\/www.rontgen.com\/wp-doctor\/?p=4694"},"modified":"2011-10-27T22:34:06","modified_gmt":"2011-10-27T21:34:06","slug":"om-positiv-vs-negativ-kontrast","status":"publish","type":"post","link":"https:\/\/www.rontgen.com\/wp-doctor\/om-positiv-vs-negativ-kontrast","title":{"rendered":"Om positiv vs. negativ kontrast"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft\" style=\"border: 0pt none;\" title=\"Fr\u00e5ga\" src=\"https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2008\/12\/icon_mini_faq.gif\" alt=\"\" width=\"12\" height=\"13\" \/> Vad menas med positiva och negativa kontrastmedel?<\/p>\n<div id=\"attachment_4709\" style=\"width: 100px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct_buk_kontrast_1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-4709\" class=\"size-thumbnail wp-image-4709 \" title=\"CT-buk\" src=\"https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct_buk_kontrast_1-150x150.jpg\" alt=\"CT-buk med positiv kontrastmedel\" width=\"90\" height=\"90\" srcset=\"https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct_buk_kontrast_1-150x150.jpg 150w, https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct_buk_kontrast_1-300x300.jpg 300w, https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct_buk_kontrast_1.jpg 550w\" sizes=\"auto, (max-width: 90px) 100vw, 90px\" \/><\/a><p id=\"caption-attachment-4709\" class=\"wp-caption-text\">CT-buk<\/p><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft\" style=\"border: 0pt none;\" title=\"Svar\" src=\"https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2008\/12\/icon_mini_register.gif\" alt=\"\" width=\"12\" height=\"13\" \/> Kontrast anv\u00e4nds f\u00f6r att skapa stora skillnader i bilden (svart och vitt) f\u00f6r att s\u00e4rskilja strukturer.<br \/>\nKontrastmedel (jod-Barium-kontrast) som kallas <em>positiv kontrast<\/em> ger normalt en ljusare struktur i r\u00f6ntgenbilden pga. att r\u00f6ntgenbestr\u00e5lningen bromsas upp. Denna kontrasteffekt anv\u00e4nds f\u00f6r att tex. s\u00e4rskilja blodrika organ eller blodfl\u00f6de i organen (exv. processer) eller markera v\u00e4ggstrukturer i mage\/tarm.<em><\/em><\/p>\n<div id=\"attachment_4697\" style=\"width: 100px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct-colon-3.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-4697\" class=\"size-thumbnail wp-image-4697 \" title=\"ct colon 3\" src=\"https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct-colon-3-150x150.jpg\" alt=\"CT-colon med luft (negativ kontrast) i tarmen\" width=\"90\" height=\"90\" srcset=\"https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct-colon-3-150x150.jpg 150w, https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct-colon-3-300x300.jpg 300w, https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2011\/10\/ct-colon-3.jpg 550w\" sizes=\"auto, (max-width: 90px) 100vw, 90px\" \/><\/a><p id=\"caption-attachment-4697\" class=\"wp-caption-text\">CT-colon<\/p><\/div>\n<p><em>Negativ kontrast<\/em> \u00e4r vanligt rumsluft eller koldioxidgas som d\u00e5 ger, oftast svarta, konturer i r\u00f6ntgenbilden gentemot omgivande strukturer eller organ. I luft m\u00f6ter r\u00f6ntgenbestr\u00e5lningen inget motst\u00e5nd vilket ger svart i bilden. En negativ kontrasteffekt f\u00e5r man s\u00e5ledes vid tex. tjocktarmsr\u00f6ntgen d\u00e4r man pumpar in luft eller gas som ger kontrasteffekt mot \u00f6vriga buken.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft\" style=\"border: 0pt none;\" title=\"Svarat av\" src=\"https:\/\/www.rontgen.com\/wp-doctor\/wp-content\/uploads\/2008\/12\/icon_mini_profile.gif\" alt=\"\" width=\"12\" height=\"13\" \/> K.T. rtgssk<br \/>\nR\u00f6ntgenavdelningen Helsingborgs lasarett<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vad menas med positiva och negativa kontrastmedel? Kontrast anv\u00e4nds f\u00f6r att skapa stora [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[64,38],"class_list":["post-4694","post","type-post","status-publish","format-standard","hentry","category-annat","tag-bilder","tag-kontrast"],"_links":{"self":[{"href":"https:\/\/www.rontgen.com\/wp-doctor\/wp-json\/wp\/v2\/posts\/4694","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rontgen.com\/wp-doctor\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rontgen.com\/wp-doctor\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rontgen.com\/wp-doctor\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rontgen.com\/wp-doctor\/wp-json\/wp\/v2\/comments?post=4694"}],"version-history":[{"count":0,"href":"https:\/\/www.rontgen.com\/wp-doctor\/wp-json\/wp\/v2\/posts\/4694\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.rontgen.com\/wp-doctor\/wp-json\/wp\/v2\/media?parent=4694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rontgen.com\/wp-doctor\/wp-json\/wp\/v2\/categories?post=4694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rontgen.com\/wp-doctor\/wp-json\/wp\/v2\/tags?post=4694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}