{"id":6243,"date":"2026-10-19T09:48:40","date_gmt":"2026-10-19T09:48:40","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-rafmagns-og-tolvuverkfraedi-hans-emil-atlason\/"},"modified":"2026-10-19T09:48:40","modified_gmt":"2026-10-19T09:48:40","slug":"doktorsvorn-i-rafmagns-og-tolvuverkfraedi-hans-emil-atlason","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-rafmagns-og-tolvuverkfraedi-hans-emil-atlason\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed rafmagns- og t\u00f6lvuverkfr\u00e6\u00f0i – Hans Emil Atlason"},"content":{"rendered":"
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V\u00f6rninni ver\u00f0ur streymt<\/a><\/p>\n

Doktorsefni:<\/strong>\u00a0Hans Emil Atlason<\/p>\n

Heiti ritger\u00f0ar:<\/strong>\u00a0Sj\u00e1lfvirk merking segul\u00f3mmynda af heila me\u00f0 dj\u00fapum tauganetum – pr\u00f3fanir \u00e1 heilah\u00f3lfum og hv\u00edtavefsbreytingum (Deep learning for segmentation of brain MRI – validation on the ventricular system and white matter lesions)<\/p>\n

Andm\u00e6lendur:<\/strong>
Dr. Bennett Landman, pr\u00f3fessor og yfirma\u00f0ur Center for Computational Imaging, Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Bandar\u00edkjunum<\/p>\n

Dr. Pierre-Louis Bazin, v\u00edsindama\u00f0ur vi\u00f0 Integrative Model-based Cognitive Neuroscience research unit, University of Amsterdam, Hollandi og Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, \u00de\u00fdskalandi<\/p>\n

Lei\u00f0beinandi:<\/strong>\u00a0Dr. Lotta Mar\u00eda Ellingsen, d\u00f3sent og varadeildarforseti Rafmagns- og t\u00f6lvuverkfr\u00e6\u00f0ideildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Einnig \u00ed doktorsnefnd:<\/strong>
Dr. Vilmundur Gu\u00f0nason, pr\u00f3fessor vi\u00f0 L\u00e6knadeild H\u00e1sk\u00f3la \u00cdslands og forst\u00f6\u00f0ul\u00e6knir Hjartaverndar
Dr. Magn\u00fas \u00d6rn \u00dalfarsson, pr\u00f3fessor og deildarforseti Rafmagns- og t\u00f6lvuverkfr\u00e6\u00f0ideildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0Dr. Jakob Sigur\u00f0sson, d\u00f3sent og sta\u00f0gengill deildarforseta Rafmagns- og t\u00f6lvuverkfr\u00e6\u00f0ideildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n

\u00c1grip<\/strong><\/p>\n

Segul\u00f3mmyndir gera taugar\u00f6ntgenl\u00e6knum kleift a\u00f0 l\u00edta inn \u00ed heila mannsins \u00ed leit a\u00f0 ors\u00f6kum sj\u00fakd\u00f3ma. T\u00falkun myndanna \u00ed kl\u00edn\u00edk er hins vegar a\u00f0 mestu leyti takm\u00f6rku\u00f0 vi\u00f0 hugl\u00e6gt mat e\u00f0a gr\u00f3fa m\u00e6lingu \u00e1 st\u00e6r\u00f0 og umfangi heilasv\u00e6\u00f0a og vefjaskemmda. Fj\u00f6ldi sj\u00e1lfvirkra a\u00f0fer\u00f0a hefur veri\u00f0 \u00fer\u00f3a\u00f0ur til a\u00f0 merkja mismunandi heilasv\u00e6\u00f0i \u00fat fr\u00e1 segul\u00f3mmyndum. Me\u00f0 sj\u00e1lfvirkum merkingum f\u00e1st m\u00e6lingar \u00e1 st\u00e6r\u00f0, l\u00f6gun og sta\u00f0setningu heilasv\u00e6\u00f0a og vefjaskemmda. Sl\u00edkar m\u00e6lingar gera rannsakendum kleift a\u00f0 framkv\u00e6ma st\u00f3rar samanbur\u00f0arranns\u00f3knir. Hef\u00f0bundnar merkingara\u00f0fer\u00f0ir eru me\u00f0al annars bygg\u00f0ar \u00e1 \u00fev\u00ed a\u00f0 finna r\u00famfr\u00e6\u00f0ilega v\u00f6rpun fr\u00e1 nokkrum handmerktum myndum yfir \u00ed \u00fe\u00e1 mynd sem vi\u00f0 h\u00f6fum \u00e1huga \u00e1 a\u00f0 f\u00e1 n\u00fdjar merkingar fyrir. \u00deessar a\u00f0fer\u00f0ir hafa gefist mj\u00f6g vel til \u00feess a\u00f0 yfirf\u00e6ra merkingar \u00e1 heilasv\u00e6\u00f0um og \u00fe\u00e6r eru miki\u00f0 nota\u00f0ar \u00ed ranns\u00f3knum. \u00d3kostir \u00feeirra eru hins vegar a\u00f0: 1) \u00de\u00e6r eru mj\u00f6g h\u00e6gar (6+ klst a\u00f0 merkja eina mynd), 2) ni\u00f0urst\u00f6\u00f0ur eru oft \u00f3n\u00e1kv\u00e6mar \u00feegar heilinn er miki\u00f0 aflaga\u00f0ur svo sem vegna r\u00fdrnunar, 3) ekki er h\u00e6gt a\u00f0 varpa sta\u00f0setningu vefjaskemmda fr\u00e1 einum einstaklingi til annars, \u00fear sem sta\u00f0setning \u00feeirra \u00ed heilanum getur veri\u00f0 breytileg.
N\u00e1kv\u00e6mustu og hr\u00f6\u00f0ustu a\u00f0fer\u00f0ir sem til eru \u00ed dag byggja \u00e1 dj\u00fapum tauganetum. Tauganet geta l\u00e6rt hva\u00f0a fall sem er milli inntaks og \u00fattaks ef n\u00e6g \u00fej\u00e1lfunarg\u00f6gn eru fyrir hendi. Eftir \u00fej\u00e1lfun geta tauganetin greint myndir mj\u00f6g hratt og n\u00e1kv\u00e6mlega. Hins vegar er mj\u00f6g d\u00fdrt og t\u00edmafrekt a\u00f0 \u00fatb\u00faa n\u00e6g \u00fej\u00e1lfunarg\u00f6gn fyrir tauganet. Oft virkar tauganet sem \u00fej\u00e1lfa\u00f0 er \u00e1 einu gagnasafni ekki jafn vel \u00e1 \u00f6\u00f0ru gagnasafni \u00fear sem \u00f6\u00f0ruv\u00edsi p\u00falsara\u00f0ir (\u00fe.e. stillingar \u00e1 segul\u00f3mt\u00e6kinu) eru nota\u00f0ar vi\u00f0 myndat\u00f6ku. \u00dev\u00ed er til mikils a\u00f0 vinna vi\u00f0 \u00fer\u00f3un tauganeta sem l\u00e1gmarka \u00fe\u00f6rf \u00e1 handger\u00f0um \u00fej\u00e1lfunarmyndum.
\u00der\u00f3a\u00f0ar hafa veri\u00f0 n\u00fdst\u00e1rlegar, sj\u00e1lfvirkar a\u00f0fer\u00f0ir til a\u00f0 merkja heilah\u00f3lf og hv\u00edtavefsbreytingar \u00ed heilanum, en \u00feekkt er a\u00f0 st\u00e6kkun heilah\u00f3lfa og umfang hv\u00edtavefsbreytinga eru tengd heilahr\u00f6rnunarsj\u00fakd\u00f3mum, m.a. Alzheimerssj\u00fakd\u00f3mi, \u00e6\u00f0aheilabilun og fullor\u00f0ins-vatnsh\u00f6f\u00f0i. A\u00f0fer\u00f0in okkar kallast SegAE, en h\u00fan er fyrsta f\u00f6ldunartauganeti\u00f0 (e. Convolutional Neural Network) sem \u00fej\u00e1lfa\u00f0 er \u00e1 \u00f3st\u00fdr\u00f0an h\u00e1tt (e. unsupervised) til \u00feess a\u00f0 finna vefi og hv\u00edtavefsbreytingar \u00ed heila \u00fat fr\u00e1 segul\u00f3mmyndum. \u00dattak SegAE eru myndir sem s\u00fdna hlutfall vefja og hv\u00edtavefsbreytinga \u00ed hverjum myndpunkti en a\u00f0 merkja hv\u00edtavefsbreytingar sj\u00e1lfvirkt hefur hinga\u00f0 til reynst erfitt vandam\u00e1l a\u00f0 leysa, m.a. vegna \u00feess a\u00f0 st\u00e6r\u00f0 og sta\u00f0setning hv\u00edtavefsbreytinga er mj\u00f6g breytileg milli einstaklinga og birtustig vefja er ekki sta\u00f0la\u00f0 \u00ed segul\u00f3mmyndum. Auk \u00feess notum vi\u00f0 \u00fattak SegAE til \u00feess a\u00f0 b\u00faa til sta\u00f0la\u00f0a mynd af heilanum \u00f3h\u00e1\u00f0 ger\u00f0 og stillingum segul\u00f3mt\u00e6kja. \u00deetta er mikill kostur \u00fear sem ein helsta \u00e1skorun l\u00e6knisfr\u00e6\u00f0ilegrar myndgreiningar \u00ed dag er \u00f3samr\u00e6mi ni\u00f0ursta\u00f0na \u00e1 milli t\u00e6kja. \u00deannig getum vi\u00f0 teki\u00f0 tauganet sem \u00fej\u00e1lfa\u00f0 er \u00e1 handger\u00f0um myndum \u00far einu gagnasafni og nota\u00f0 \u00fea\u00f0 \u00e1 \u00f6\u00f0ru \u00fear sem inntaki\u00f0 \u00ed tauganeti\u00f0 eru sta\u00f0la\u00f0ar myndir af \u00feeim efnum sem orsaka birtuskil myndara\u00f0a \u00ed segul\u00f3mun.
A\u00f0fer\u00f0irnar hafa veri\u00f0 pr\u00f3fa\u00f0ar \u00e1 mismunandi gagnas\u00f6fnum, \u00fe.\u00e1 m. \u00d6ldrunarranns\u00f3kn Hjartaverndar, sem inniheldur \u00fe\u00fasundir heilamynda af einstaklingum me\u00f0 mikinn breytileika m.t.t. heilah\u00f3lfa og hv\u00edtavefsbreytinga. A\u00f0fer\u00f0irnar hafa veri\u00f0 bornar saman vi\u00f0 a\u00f0fer\u00f0ir \u00ed fremstu r\u00f6\u00f0 auk handmerktra mynda, sem merktar hafa veri\u00f0 af taugar\u00f6ntgenl\u00e6knum. Ni\u00f0urst\u00f6\u00f0ur okkar benda til \u00feess a\u00f0 a\u00f0fer\u00f0irnar s\u00e9u afar n\u00e1kv\u00e6mar og st\u00f6\u00f0ugar gagnvart breytileika milli segul\u00f3mt\u00e6kja og breytileika \u00ed byggingu heilans og eru \u00fe\u00e6r \u00fear a\u00f0 auki hra\u00f0virkari en fyrri a\u00f0fer\u00f0ir.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Hans Emil Atlason er f\u00e6ddur 1991. Hann \u00fatskrifa\u00f0ist me\u00f0 BS-gr\u00e1\u00f0u \u00ed rafmagns- og t\u00f6lvuverkfr\u00e6\u00f0i fr\u00e1 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2014 og tveimur \u00e1rum seinna me\u00f0 MSc-gr\u00e1\u00f0u \u00ed heilbrig\u00f0isverkfr\u00e6\u00f0i fr\u00e1 t\u00e6knih\u00e1sk\u00f3lanum Chalmers \u00ed Sv\u00ed\u00fej\u00f3\u00f0. Hann h\u00f3f doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2017. \u00c1ri\u00f0 2020 stofna\u00f0i hann Visk ehf., sem b\u00fd\u00f0ur framlei\u00f0slufyrirt\u00e6kjum upp \u00e1 lausnir bygg\u00f0ar \u00e1 t\u00f6lvusj\u00f3n.<\/p>\n<\/div><\/div>","protected":false},"featured_media":5012,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2021-12-08T10:00:00+00:00","_phd_date_end":"2021-12-08T12:00:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0arsalur","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Sj\u00e1lfvirk merking segul\u00f3mmynda af heila me\u00f0 dj\u00fapum tauganetum - pr\u00f3fanir \u00e1 heilah\u00f3lfum og hv\u00edtavefsbreytingum (Deep learning for segmentation of brain MRI - validation on the ventricular system and white matter lesions)","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_rafmagns_og_tolvuverkfraedi_hans_emil_atlason","_phd_source_node_id":"380775","_phd_source_type":"vidburdir","_phd_member_id":770,"footnotes":""},"phd_school":[94,93],"phd_discipline":[95],"class_list":["post-6243","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-rafmagns-og-tolvuverkfraedideild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-rafmagns-og-tolvuverkfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6243","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6243\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/5012"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6243"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6243"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}