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Novel Algorithm Shortens MRI Scans to Nearly a Minute

By MedImaging International staff writers
Posted on 15 Apr 2019
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Image: Dr. Stefan Skare’s algorithm improves MRI acquisition times (Photo courtesy of Catarina Thepper / KI).
Image: Dr. Stefan Skare’s algorithm improves MRI acquisition times (Photo courtesy of Catarina Thepper / KI).
A new multicontrast magnetic resonance imaging (MRI) technique can cut down the time needed to complete a scan to about 70 seconds, claims a new study.

Developed by researchers at Karolinska Institutet (KI; Solna, Sweden), Karolinska University Hospital (Stockholm, Sweden), GE Healthcare (GE, Little Chalfont, United Kingdom), and other institutions, the echo planar image mix (EPIMix) MRI technique combines contrast T1 -FLAIR, T2 -weighted, diffusion-weighted images (DWI), apparent diffusion coefficient (ADC), T2*-weighted, and T2 -FLAIR images into one multicontrast MRI technique.

To assess if EPIMix has comparable diagnostic performance as routine clinical brain MRI, the researchers conducted a prospective study of a consecutive series of 103 patients' brain MRI from January 2018 to May 2018 using a 1.5T or 3T scanner. Two neuroradiologists assessed both EPIMix and clinical scans and categorized the images as abnormal or normal and described diagnosis, artifacts, diagnostic confidence image quality, and comparison of imaging time. In all, 82 patients were evaluated.

The results revealed that diagnostic performance was comparable between EPIMix and routine clinical MRI, with a sensitivity of 95% and 93%, and a specificity of 100% and 100%, respectively. Disease category match between EPIMix and clinical routine MRI was 90% for one reader and 93% for the other. Imaging time was 78 seconds for EPIMix, as compared to 12 minutes 29 seconds for conventional 3T MRI. Image quality was generally rated lower for EPIMix. The study was published on April 1, 2019, in the Journal of Magnetic Resonance Imaging.

“I have worked with MRI technology for a long time and with the problem of how difficult it is for patients to lie still for the camera. So, one day, I asked myself if there was any way to use rapid echo planar imaging (EPI) with other MRI types needed for brain scans,” said senior author Stefan Skare, PhD, of the KI department of neuroradiology. “In this way, the whole examination is faster and less sensitive to patient movement. Initially, I just wanted to test the concept. I didn't think it would be such a major breakthrough.”

EPI is capable of acquiring an entire MRI in only a fraction of a second; in single-shot EPI, all the spatial-encoding data of an image can be obtained after a single radio-frequency excitation, resulting in high-quality images comparable to conventional MRI, but with major advantages over conventional MRI that include reduced imaging time, decreased motion artifact, and the ability to image rapid physiologic processes of the human body.

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93 (55.074691772461): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
94 (48.87580871582): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (55.074691772461): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
107 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
108 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
109 (70.810317993164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
110 (78.916549682617): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294777612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (77.962875366211): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294777612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (420.09353637695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
113 (88.930130004883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
114 (87.02278137207): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294777612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
115 (594.13909912109): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294777612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
116 (561.95259094238): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
117 (402.92739868164): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
118 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
119 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
120 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
121 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
122 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
123 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
124 (305.8910369873): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 190834.99908447): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
126 (208.13941955566): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
127 (139.95170593262): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
128 (!!!!! 4277.9445648193): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294777612 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294777612 AND type='deeppockets_item' AND published='1' LIMIT 1
129 (!!!!! 1241655.1113129): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
130 (!!!!! 1168.966293335): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
131 (419.13986206055): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
132 (212.9077911377): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
133 (123.97766113281): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
134 (121.11663818359): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
135 (93.936920166016): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
136 (91.075897216797): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
137 (!!!!! 1389.0266418457): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (!!!!! 1097.9175567627): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (320.9114074707): SELECT name FROM jos_deeppockets WHERE id=212
140 (236.03439331055): SELECT name FROM jos_deeppockets WHERE id=212
141 (658.03527832031): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (957.96585083008): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (!!!!! 2389.9078369141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
144 (240.08750915527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
145 (!!!!! 32287.120819092): TRUNCATE TABLE jos_trademed_module
146 (124.93133544922): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294777612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (75.101852416992): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294777612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (!!!!! 5053.0433654785): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
151 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
152 (!!!!! 1033.0677032471): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
153 (126.12342834473): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
154 (47.206878662109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
155 (213.1462097168): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294777612 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294777612 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (53.882598876953): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
157 (89.168548583984): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
158 (55.074691772461): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (!!!!! 4352.0927429199): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
160 (!!!!! 3628.0155181885): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777612 AND published='1' LIMIT 1
161 (309.94415283203): select jos_twitters.link from jos_twitters where cat=10
162 (147.10426330566): select jos_facebook.link from jos_facebook where cat=10
163 (82.969665527344): select jos_google_plus.link from jos_google_plus where cat=10
164 (486.13548278809): select jos_linkedin.link from jos_linkedin where cat=10
165 (524.99771118164): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
166 (!!!!! 3121.1376190186): insert into jos_banners_delta values (14615,'2025-04-29 21:13:59','3.17.157.68','view'),(14202,'2025-04-29 21:13:59','3.17.157.68','view'),(14203,'2025-04-29 21:13:59','3.17.157.68','view')