{"id":11601,"date":"2021-05-11T12:17:32","date_gmt":"2021-05-11T09:17:32","guid":{"rendered":"https:\/\/umram.bilkent.edu.tr\/?p=11601"},"modified":"2021-05-11T12:17:32","modified_gmt":"2021-05-11T09:17:32","slug":"implantli-hastalardan-dikey-delikli-tarayicilardan-goruntu-alinabilir-mi","status":"publish","type":"post","link":"https:\/\/umram.bilkent.edu.tr\/index.php\/tr\/2021\/05\/11\/implantli-hastalardan-dikey-delikli-tarayicilardan-goruntu-alinabilir-mi\/","title":{"rendered":"\u0130mplantl\u0131 hastalardan dikey delikli taray\u0131c\u0131lardan g\u00f6r\u00fcnt\u00fc al\u0131nabilir mi?"},"content":{"rendered":"

UMRAM’dan Ehsan Kazamivalipour<\/a>, dikey delikli taray\u0131c\u0131n\u0131n implantlarla etkile\u015fimini ara\u015ft\u0131rmak i\u00e7in Northwestern \u00dcniversitesi’ndeki ara\u015ft\u0131rmac\u0131larla i\u015fbirli\u011fi yapt\u0131. Dikey delikli taray\u0131c\u0131 kullan\u0131ld\u0131\u011f\u0131nda implant \u0131s\u0131nma sorununun \u00f6nemli \u00f6l\u00e7\u00fcde daha az oldu\u011funu g\u00f6sterdiler. Bunun nedeni, elektrik alan y\u00f6n\u00fcn\u00fcn bu taray\u0131c\u0131larda implante edilen kur\u015funa esas olarak ortogonal olmas\u0131d\u0131r. Makale, T\u0131pta Manyetik Rezonans’ta “Dikey a\u00e7\u0131k delikli MRI taray\u0131c\u0131lar\u0131 implante edilen elektrotlar\u0131n etraf\u0131nda \u00f6nemli \u00f6l\u00e7\u00fcde daha az radyofrekans \u0131s\u0131nmas\u0131 \u00fcretiyor: 1.5T yatay sistemlere kar\u015f\u0131 1.2T OASIS taray\u0131c\u0131larda derin beyin stim\u00fclasyon implantlar\u0131 \u00fczerine bir \u00e7al\u0131\u015fma\" ba\u015fl\u0131\u011f\u0131yla yay\u0131nland\u0131. Yazarlar; Ehsan Kazemivalipour, Bhumi Bhusal, Jasmine Vu, Stella Lin, Bach Thanh Nguyen, John Kirsch, Elizabeth Nowac, Julie Pilitsis, Joshua Rosenow, Ergin Atalar<\/a> ve Laleh Golestanirad’d\u0131r.<\/p>\n

\u00d6ZET<\/strong><\/p>\n

\n

Ama\u00e7<\/strong><\/p>\n

Patients with active implants such as deep brain stimulation (DBS) devices are often denied access to MRI due to safety concerns associated with the radiofrequency (RF) heating of their electrodes. The majority of studies on RF heating of conductive implants have been performed in horizontal close\u2010bore MRI scanners. Vertical MRI scanners which have a 90\u00b0 rotated transmit coil generate fundamentally different electric and magnetic field distributions, yet very little is known about RF heating of implants in this class of scanners. We performed numerical simulations as well as phantom experiments to compare RF heating of DBS implants in a 1.2T vertical scanner (OASIS, Hitachi) compared to a 1.5T horizontal scanner (Aera, Siemens).<\/p>\n<\/section>\n

\n

Metotlar<\/strong><\/p>\n

Simulations were performed on 90 lead models created from post\u2010operative CT images of patients with DBS implants. Experiments were performed with wires and commercial DBS devices implanted in an anthropomorphic phantom.<\/p>\n<\/section>\n

\n

Sonu\u00e7lar<\/strong><\/p>\n

We found significant reduction of 0.1 g\u2010averaged specific absorption rate (30\u2010fold,\u00a0P<\/i>\u00a0< 1 \u00d7 10\u22125<\/sup>) and RF heating (9\u2010fold,\u00a0P<\/i>\u00a0< .026) in the 1.2T vertical scanner compared to the 1.5T conventional scanner.<\/p>\n<\/section>\n

\n

Conclusion<\/strong><\/p>\n

Vertical MRI scanners appear to generate lower RF heating around DBS leads, providing potentially heightened safety or the flexibility to use sequences with higher power levels than on conventional systems.<\/p>\n<\/section>\n

Daha fazlas\u0131;<\/p>\n

https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1002\/mrm.28818\u00a0<\/a><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":7,"featured_media":11581,"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\/11601"}],"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\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/comments?post=11601"}],"version-history":[{"count":1,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/posts\/11601\/revisions"}],"predecessor-version":[{"id":11602,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/posts\/11601\/revisions\/11602"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/media\/11581"}],"wp:attachment":[{"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/media?parent=11601"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/categories?post=11601"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/tags?post=11601"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}