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Philips Healthcare

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AI Algorithm Automatically Detects Artifacts on MRI Scans

By MedImaging International staff writers
Posted on 12 Jun 2023
Image: VitaLenz is designed to assist MR technologists during scanning (Photo courtesy of Freepik)
Image: VitaLenz is designed to assist MR technologists during scanning (Photo courtesy of Freepik)

Advancements in magnetic resonance (MR) acceleration techniques have transformed MR productivity. Moreover, incorporating artificial intelligence (AI) has the potential to streamline MR workflow and speed up image acquisition. However, operator-assisted technologies have failed to catch up with MRI advances. This gap could now be bridged with a novel AI model developed to identify typical MRI artifacts with high sensitivity, precision, and speed. The adoption of such assistive technologies can ensure image quality and accelerate the clinical uptake of newer imaging techniques.

Scientists at Philips (Amsterdam, The Netherlands) have developed VitaLenz, an AI algorithm capable of automatically identifying artifacts in MRI scans. This real-time object detection convolutional neural network (CNN) was trained on 4,606 brain images and is designed to support MR technologists during scanning. The model was trained using three types of image contrasts (T1-weighted, T2-weighted, and FLAIR) and three imaging planes (axial, sagittal, and coronal). These images were further processed to generate six common image artifacts: motion, wrap, blurring, bias field, RF spike, and geometric distortion. Subsequently, the model was put to the test on 570 MR images, both with and without artifacts, and assessed for sensitivity, specificity, and accuracy. Additionally, a subset of test images was examined by eight registered MR technologists, each with an average of 17.2 years of experience, to compare the model's performance with human readers.

The researchers found that VitaLenz demonstrated a similar performance compared with the human reader group in terms of sensitivity and accuracy. Furthermore, on average, VitaLenz took a mere 0.477 seconds per image to detect, label, and locate artifacts. These results suggest that VitaLenz has the capacity to identify, label, and locate MR image artifacts with high sensitivity, accuracy, and speed. Although the model showcased considerably lower specificity, its high sensitivity indicates its potential use in identifying images containing artifacts that may require re-examination or adjustment. In addition, VitaLenz's image evaluation speed substantially surpasses that of human readers and remains unaffected by the fatigue experienced by technologists when analyzing thousands of images during a typical shift.

"As new technology to accelerate image acquisition is developed and productivity demands are increased, it is imperative that technology that assists the MR technologist is created in parallel," said Joel Batey, a MR clinical consultant at Philips who presented the findings at the recent International Society for Magnetic Resonance in Medicine (ISMRM) meeting. "As MR image acceleration techniques advance, it is important to co-create tools that assist the technologist to ensure patient care and image quality is maintained."

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93 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (114.91775512695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
105 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
106 (86.069107055664): 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=294797516 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (71.048736572266): 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=294797516 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 3256.7977905273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
109 (137.0906829834): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
110 (77.009201049805): 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=294797516 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (691.89071655273): 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=294797516 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (766.99256896973): 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
113 (487.08915710449): 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
114 (154.97207641602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
115 (113.01040649414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
116 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
117 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
118 (74.148178100586): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
119 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
120 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
121 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
122 (!!!!! 5950.927734375): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294797516 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294797516 AND type='deeppockets_item' AND published='1' LIMIT 1
123 (!!!!! 755604.02870178): ( 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
124 (87.976455688477): ( 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
125 (463.96255493164): 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
126 (51.975250244141): 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
127 (314.95094299316): 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
128 (43.869018554688): 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
129 (242.94853210449): 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
130 (44.107437133789): 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
131 (536.91864013672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
132 (417.94776916504): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
133 (330.20973205566): SELECT name FROM jos_deeppockets WHERE id=212
134 (42.915344238281): SELECT name FROM jos_deeppockets WHERE id=212
135 (573.15826416016): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
136 (500.91743469238): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
137 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
138 (65.803527832031): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
139 (426.05400085449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
140 (76.055526733398): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
141 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
142 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
143 (!!!!! 1377.8209686279): 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
144 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
145 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
146 (51.021575927734): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294797516 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294797516 AND type='deeppockets_item' AND published='1' LIMIT 1
147 (40.054321289062): 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)
148 (38.14697265625): 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)
149 (39.100646972656): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
150 (164.98565673828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
151 (81.777572631836): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797516 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797516 AND published='1' LIMIT 1
152 (116.10984802246): select jos_twitters.link from jos_twitters where cat=10
153 (42.200088500977): select jos_facebook.link from jos_facebook where cat=10
154 (41.961669921875): select jos_google_plus.link from jos_google_plus where cat=10
155 (41.007995605469): select jos_linkedin.link from jos_linkedin where cat=10