{"id":10516,"date":"2020-01-22T10:16:13","date_gmt":"2020-01-22T07:16:13","guid":{"rendered":"https:\/\/umram.bilkent.edu.tr\/?p=10516"},"modified":"2020-01-22T14:12:47","modified_gmt":"2020-01-22T11:12:47","slug":"mr-safety-watchdog-for-active-catheters","status":"publish","type":"post","link":"https:\/\/umram.bilkent.edu.tr\/index.php\/2020\/01\/22\/mr-safety-watchdog-for-active-catheters\/","title":{"rendered":"MR Safety Watchdog For Active Catheters"},"content":{"rendered":"

Former UMRAM student, Ali \u00c7a\u011flar \u00d6zen<\/a> has authored an MRM article in\u00a0<\/span>collaboration with Ergin Atalar<\/a> on increasing the safety profile of\u00a0<\/span>active catheters for possible use in MR-guided cardiovascular\u00a0<\/span>interventions. Dr. \u00c7a\u011flar is currently working at the University of\u00a0<\/span>Freiburg. The other authors of the article are from the same\u00a0<\/span>university. The title of the work is “MR safety watchdog for active\u00a0<\/span>catheters: Wireless impedance control with real\u2010time feedback.\"<\/span><\/span><\/p>\n

Abstract<\/span><\/p>\n

\n
\n

Purpose<\/span><\/h3>\n

To dynamically minimize radiofrequency (RF)\u2010induced heating of an active catheter through an automatic change of the termination impedance.<\/span><\/p>\n<\/section>\n

\n

Methods<\/span><\/h3>\n

A prototype wireless module was designed that modifies the input impedance of an active catheter to keep the temperature rise during MRI below a threshold, \u0394Tmax<\/sub>. The wireless module (MR safety watchdog; MRsWD) measures the local temperature at the catheter tip using either a built\u2010in thermistor or external data from a fiber\u2010optical thermometer. It automatically changes the catheter input impedance until the temperature rise during MRI is minimized. If \u0394Tmax<\/sub>\u00a0is exceeded, RF transmission is blocked by a feedback system.<\/span><\/p>\n<\/section>\n

\n

Results<\/span><\/h3>\n

The thermistor and fiber\u2010optical thermometer provided consistent temperature data in a phantom experiment. During MRI, the MRsWD was able to reduce the maximum temperature rise by 25% when operated in real\u2010time feedback mode.<\/span><\/p>\n<\/section>\n

\n

Conclusion<\/span><\/h3>\n

This study demonstrates the technical feasibility of an MRsWD as an alternative or complementary approach to reduce RF\u2010induced heating of active interventional devices. The automatic MRsWD can reduce heating using direct temperature measurements at the tip of the catheter. Given that temperature measurements are intrinsically slow, for a clinical implementation, a faster feedback parameter would be required such as the RF currents along the catheter or scattered electric fields at the tip.<\/span><\/p>\n<\/section>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":10521,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[256],"tags":[],"_links":{"self":[{"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/posts\/10516"}],"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=10516"}],"version-history":[{"count":9,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/posts\/10516\/revisions"}],"predecessor-version":[{"id":10588,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/posts\/10516\/revisions\/10588"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/media\/10521"}],"wp:attachment":[{"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/media?parent=10516"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/categories?post=10516"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/umram.bilkent.edu.tr\/index.php\/wp-json\/wp\/v2\/tags?post=10516"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}