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Researchers Use AI to Improve Mammogram Interpretation

By MedImaging International staff writers
Posted on 04 Jul 2018
A team of researchers at the Department of Energy’s Oak Ridge National Laboratory (Oak Ridge, TN, USA) successfully used artificial intelligence to improve understanding of the cognitive processes involved in image interpretation. More...
Their work, which was published in the Journal of Medical Imaging, will help reduce errors in the analyses of diagnostic images by health professionals and has the potential to improve health outcomes for women affected by breast cancer.

Early detection of breast cancer is critical for effective treatment, which requires accurate interpretation of a patient’s mammogram. The ORNL-led team of researchers found that analyses of mammograms by radiologists were significantly influenced by context bias, or the radiologist’s previous diagnostic experiences. New radiology trainees were most susceptible to the phenomenon, although even more experienced radiologists fall victim to some degree, according to the researchers.

The researchers designed an experiment aimed at following the eye movements of radiologists at various skill levels to better understand the context bias involved in their individual interpretations of the images. The experiment followed the eye movements of three board certified radiologists and seven radiology residents as they analyzed 100 mammographic studies from the University of South Florida’s Digital Database for Screening Mammography. The 400 images, representing a mix of cancer, no cancer, and cases that mimicked cancer but were benign, were specifically selected to cover a range of cases similar to that found in a clinical setting.

The participants, who were grouped by levels of experience and had no prior knowledge of what was contained in the individual X-rays, were outfitted with a head-mounted eye-tracking device designed to record their “raw gaze data,” which characterized their overall visual behavior. The study also recorded the participants’ diagnostic decisions via the location of suspicious findings along with their characteristics according to the BI-RADS lexicon, the radiologists’ reporting scheme for mammograms. By computing a measure known as a fractal dimension on the individual participants’ scan path (map of eye movements) and performing a series of statistical calculations, the researchers were able to discern how the eye movements of the participants differed from mammogram to mammogram. They also calculated the deviation in the context of the different image categories, such as images that show cancer and those that may be easier or more difficult to decipher.

In order to effectively track the participants’ eye movements, the researchers had to employ real-time sensor data, which logs nearly every movement of the participants’ eyes. However, with 10 observers interpreting 100 cases, the data soon began adding up, making it impractical to manage such a data-intensive task manually. This made the researchers turn to artificial intelligence to help them efficiently and effectively make sense of the results. Using ORNL’s Titan supercomputer, the researchers were able to rapidly train the deep learning models required to make sense of the large datasets. While similar studies in the past have used aggregation methods to make sense of the enormous data sets, the team of researchers at ORNL processed the full data sequence, a critical task as over time this sequence revealed differentiations in the eye paths of the participants as they analyzed the various mammograms.

In a related paper published in the Journal of Human Performance in Extreme Environments, the researchers demonstrated how convolutional neural networks, a type of artificial intelligence commonly applied to the analysis of images, significantly outperformed other methods, such as deep neural networks and deep belief networks, in parsing the eye tracking data and, by extension, validating the experiment as a means to measure context bias. Furthermore, while the experiment focused on radiology, the resulting data drove home the need for “intelligent interfaces and decision support systems” to assist human performance across a range of complex tasks including air-traffic control and battlefield management.

While machines are unlikely to replace radiologists (or other humans involved in rapid, high-impact decision-making) any time soon, they do hold enormous potential to assist health professionals and other decision makers in reducing errors due to phenomena such as context bias, according to Gina Tourassi, team lead and director of ORNL’s Health Data Science Institute. “These findings will be critical in the future training of medical professionals to reduce errors in the interpretations of diagnostic imaging. These studies will inform human/computer interactions, going forward as we use artificial intelligence to augment and improve human performance,” said Tourassi.

Related Links:
Oak Ridge National Laboratory


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83 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
84 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
85 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (34.809112548828): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
88 (65.088272094727): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294774021 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (36.954879760742): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294774021 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (41.007995605469): 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`
91 (66.995620727539): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (95.129013061523): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
106 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
107 (70.095062255859): 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=294774021 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (58.889389038086): 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=294774021 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (118.97087097168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
110 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
111 (66.995620727539): 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=294774021 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (715.01731872559): 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=294774021 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (761.98577880859): 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 (511.16943359375): 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
115 (177.14500427246): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
116 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
117 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
118 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
119 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
120 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
121 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
122 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
123 (386.95335388184): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
124 (!!!!! 25758.028030396): 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
125 (674.96299743652): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294774021 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294774021 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 9598.970413208): ( 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
127 (153.0647277832): ( 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
128 (72.956085205078): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (44.822692871094): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
130 (82.015991210938): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (41.007995605469): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
132 (447.98851013184): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (83.92333984375): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
134 (54.121017456055): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (40.054321289062): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
136 (655.8895111084): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (446.08116149902): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (54.121017456055): SELECT name FROM jos_deeppockets WHERE id=217
139 (36.001205444336): SELECT name FROM jos_deeppockets WHERE id=217
140 (717.8783416748): 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 '((;)|(^))217((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (633.00132751465): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))217((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
143 (69.856643676758): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
144 (!!!!! 14232.873916626): TRUNCATE TABLE jos_trademed_module
145 (118.01719665527): 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=294774021 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (82.969665527344): 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=294774021 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (550.98533630371): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (80.82389831543): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
150 (47.206878662109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
151 (!!!!! 1243.8297271729): 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
152 (59.843063354492): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
153 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
154 (37.908554077148): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294774021 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294774021 AND type='deeppockets_item' AND published='1' LIMIT 1
155 (32.901763916016): 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=217 or channel_id is null)
156 (46.968460083008): 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=217 or channel_id is null)
157 (37.908554077148): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
158 (118.01719665527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
159 (315.90461730957): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294774021 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294774021 AND published='1' LIMIT 1
160 (38.14697265625): select jos_twitters.link from jos_twitters where cat=10
161 (32.901763916016): select jos_facebook.link from jos_facebook where cat=10
162 (31.948089599609): select jos_google_plus.link from jos_google_plus where cat=10
163 (31.948089599609): select jos_linkedin.link from jos_linkedin where cat=10