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Application Provides Functional Enhancement for fMRI

By MedImaging International staff writers
Posted on 16 Feb 2011
Over the last few years, researchers have used a type of brain scanning called functional magnetic resonance imaging (fMRI) to help map changes in blood flow in the brain and to correlate this with thoughts and behavior. Computer engineers have now developed a more robust, three-stage approach to fMRI that could significantly improve the detection of neural activity and allow researchers to make more precise interpretations of fMRI data.

A new way to analyze fMRI data, which could improve was reported in 2010 (no. 3) issue of the International Journal of Computational Biology and Drug Design. Scientists have long known that changes in blood flow and blood oxygenation in the brain (hemodynamics) are correlated with activity in brain cells, neurons. When a neuron is active, it demands more energy from glucose and this need increases blood flow to the regions of the brain where there is more neural activity. This leads to local changes in the relative concentration of oxyhemoglobin and deoxyhemoglobin and alterations in local cerebral blood volume and in local cerebral blood flow, which researchers have been measuring using fMRI since the early 1990s. Since then, brain-mapping using this comparatively noninvasive technique, which also avoids exposure to ionizing radiation has become more widely used.

Researchers have used fMRI to examine brain development and function, to diagnose problems following injury and to predict when a person might be healthy enough to return to work, as an alternative to lie detectors, to peer, allegedly, into an individual's dreams, and even to communicate with patients in a vegetative state. Many of the experiments that have received attention are controversial in that interpreting images of altering blood flow in the brain is only a proxy of actual activity Moreover, extrapolating those proxy images to thoughts and behavior involves a not insignificant extrapolation.

Dr. Chuan Li and Dr. Qi Hao, from the department of electrical and computer engineering at the University of Alabama (Tuscaloosa, USA), developed the new technique. The team explained that there are three stages to their approach: prediction, modeling, and inference. Prediction involves identifying regions of interest associated with an extraordinary amount of neural activity through temporal clustering analysis (TCA). Modeling involves categorizing the fMRI signals related to neural activity into event prototypes through linear predictive coding (LPC). Finally, inference is the determination of the types of neural activity taking place in terms of activation, deactivation, and normality using a type of statistical analysis known as Bayesian inference.

The approach bypasses to some extent the problems inherent in current approaches to fMRI, namely low signal-to-noise ratio, high data volumes, differences between patients or subjects, and artifacts caused by the movement of the person being scanned. Their application allows them to turn large amounts of often-noisy data into discrete sequences of neural activity events. The investigators have shown how well their approach works by analyzing data from fMRI scans on volunteers involved in the simple activities of drinking a glass of water or a glass of glucose solution. "Our expertise is in signal processing and machine learning. Our research goal is to develop a set of powerful signal processing tools for fMRI researchers,” concluded Dr. Hao.

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90 (917.19627380371): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (643.96858215332): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (55.074691772461): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (128.03077697754): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (194.07272338867): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (138.99803161621): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (211.95411682129): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (156.87942504883): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (125.16975402832): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (182.15179443359): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 1122.9515075684): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
105 (187.87384033203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
106 (481.84394836426): 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=294733429 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (55.074691772461): 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=294733429 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 1144.8860168457): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
109 (297.06954956055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
110 (216.96090698242): 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=294733429 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (958.91952514648): 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=294733429 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (843.04809570312): 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 (441.07437133789): 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 (811.10000610352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
115 (316.85829162598): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
116 (784.15870666504): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
117 (280.85708618164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
118 (762.939453125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
119 (179.05235290527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
120 (654.93583679199): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
121 (219.10667419434): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
122 (675.91667175293): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 43626.070022583): 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
124 (766.03889465332): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294733429 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294733429 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (275.1350402832): ( 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
126 (43.153762817383): ( 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 (540.97175598145): 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
128 (39.815902709961): 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 (428.91502380371): 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
130 (43.869018554688): 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 (166.89300537109): 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
132 (195.02639770508): 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 (452.04162597656): 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
134 (36.001205444336): 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 (543.83277893066): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (370.02563476562): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (61.03515625): SELECT name FROM jos_deeppockets WHERE id=212
138 (40.054321289062): SELECT name FROM jos_deeppockets WHERE id=212
139 (770.80726623535): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (655.17425537109): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (93.221664428711): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
142 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
143 (!!!!! 29176.950454712): TRUNCATE TABLE jos_trademed_module
144 (83.92333984375): 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=294733429 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (65.088272094727): 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=294733429 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 3193.1400299072): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (488.0428314209): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
149 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
150 (!!!!! 1720.1900482178): 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
151 (458.0020904541): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
152 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
153 (125.88500976562): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294733429 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294733429 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (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=212 or channel_id is null)
155 (29.087066650391): 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)
156 (247.00164794922): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 1096.9638824463): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
158 (188.11225891113): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733429 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733429 AND published='1' LIMIT 1
159 (231.02760314941): select jos_twitters.link from jos_twitters where cat=10
160 (32.901763916016): select jos_facebook.link from jos_facebook where cat=10
161 (120.87821960449): select jos_google_plus.link from jos_google_plus where cat=10
162 (30.994415283203): select jos_linkedin.link from jos_linkedin where cat=10
163 (795.12596130371): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1376.1520385742): insert into jos_banners_delta values (14615,'2025-06-27 16:35:31','216.73.216.249','view'),(14202,'2025-06-27 16:35:31','216.73.216.249','view'),(14203,'2025-06-27 16:35:31','216.73.216.249','view')