{"id":3584,"date":"2017-12-14T10:15:05","date_gmt":"2017-12-14T07:15:05","guid":{"rendered":"https:\/\/umram.bilkent.edu.tr\/?p=3584"},"modified":"2018-09-13T10:15:47","modified_gmt":"2018-09-13T07:15:47","slug":"dogrusal-ve-dogrusal-olmayan-gradyanlarin-es-zamanli-kullanimi-ile-b1-duzensizliklerinin-duzeltilmesi","status":"publish","type":"post","link":"https:\/\/umram.bilkent.edu.tr\/index.php\/tr\/2017\/12\/14\/dogrusal-ve-dogrusal-olmayan-gradyanlarin-es-zamanli-kullanimi-ile-b1-duzensizliklerinin-duzeltilmesi\/","title":{"rendered":"Do\u011frusal ve Do\u011frusal Olmayan Gradyanlar\u0131n E\u015f Zamanl\u0131 Kullan\u0131m\u0131 ile B1+ D\u00fczensizliklerinin D\u00fczeltilmesi"},"content":{"rendered":"<p>Umram ara\u015ft\u0131rmac\u0131lar\u0131n\u0131n yay\u0131nlad\u0131\u011f\u0131 \u00e7al\u0131\u015fmada, do\u011frusal ve do\u011frusal olmayan gradyanlar\u0131n e\u015f zamanl\u0131 kullan\u0131m\u0131n\u0131n, sadece do\u011frusal veya sadece do\u011frusal olmayan gradyan kullan\u0131lan durumlara g\u00f6re, B1+ d\u00fczensizliklerinin daha etkili bir \u015fekilde d\u00fczeltti\u011fi g\u00f6r\u00fclm\u00fc\u015ft\u00fcr. Y\u00fcksek Tesla MR taray\u0131c\u0131lar\u0131nda (3T ve yukar\u0131s\u0131), radio frekans (RF) dalgalar\u0131n\u0131n dalga boylar\u0131n\u0131n k\u0131salarak hastan\u0131n g\u00f6r\u00fcnt\u00fclenen b\u00f6lgesi ile k\u0131yaslanabilir hale gelmektedir ve bu durum uzaysal olarak e\u015fit bir uyar\u0131m yap\u0131lmas\u0131n\u0131 engeller. Literat\u00fcrde, RF dalgalar ve gradyanlar\u0131 birlikte kullanarak \u201cspoke uyar\u0131m\u0131\u201d denilen bir teknik ile bu d\u00fczensizlikler belirli bir seviyeye kadar d\u00fczeltilebilir. Bu \u00e7al\u0131\u015fmada harici olarak eklenen ve ba\u011f\u0131ms\u0131z y\u00fckselte\u00e7ler taraf\u0131ndan do\u011frusal olmayan gradyanlar\u0131n da sisteme eklenmesi ile sistemdeki \u00f6zg\u00fcr parametre say\u0131s\u0131 art\u0131r\u0131lm\u0131\u015ft\u0131r. Form\u00fclasyonlar ve tasar\u0131m teknikleri makalede a\u00e7\u0131klanm\u0131\u015ft\u0131r. \u00d6rnek bir deneysel durumda, uyar\u0131m profili d\u00fczensizlikleri \u00f6nerilen teknikle %46 azalt\u0131l\u0131rken, sadece do\u011frusal gradyanlar\u0131n kullan\u0131ld\u0131\u011f\u0131 durumda sadece %20 d\u00fczeltmeye elde edilebilmi\u015ftir.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Umram ara\u015ft\u0131rmac\u0131lar\u0131n\u0131n yay\u0131nlad\u0131\u011f\u0131 \u00e7al\u0131\u015fmada, do\u011frusal ve do\u011frusal olmayan gradyanlar\u0131n e\u015f zamanl\u0131 kullan\u0131m\u0131n\u0131n, sadece do\u011frusal veya sadece do\u011frusal olmayan gradyan kullan\u0131lan durumlara g\u00f6re, B1+ d\u00fczensizliklerinin daha etkili bir \u015fekilde d\u00fczeltti\u011fi g\u00f6r\u00fclm\u00fc\u015ft\u00fcr. Y\u00fcksek Tesla MR taray\u0131c\u0131lar\u0131nda (3T ve yukar\u0131s\u0131), radio frekans (RF) dalgalar\u0131n\u0131n dalga boylar\u0131n\u0131n k\u0131salarak hastan\u0131n g\u00f6r\u00fcnt\u00fclenen b\u00f6lgesi ile k\u0131yaslanabilir hale gelmektedir ve bu durum uzaysal [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3582,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[445],"tags":[],"_links":{"self":[{"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/posts\/3584"}],"collection":[{"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/comments?post=3584"}],"version-history":[{"count":1,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/posts\/3584\/revisions"}],"predecessor-version":[{"id":3585,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/posts\/3584\/revisions\/3585"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/media\/3582"}],"wp:attachment":[{"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/media?parent=3584"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/categories?post=3584"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/tags?post=3584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}