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New MRI Technique Detects Subtle but Serious Brain Injury

By MedImaging staff writers
Posted on 03 Jun 2008
A new technique developed for analyzing magnetic resonance imaging (MRI) data can reveal serious brain injury overlooked by current diagnostic tests and help predict a patient's degree of recovery.

In brain injuries sustained when the head suddenly stops moving--during a motor vehicle accident, for instance--the force can shear and damage nerve cells. This kind of injury does not show up on computerized tomography (CT) scans, according to researchers, and MRI does not yet reliably detect this type of injury.

"This is a new way of measuring a common injury that has been overlooked,” said Dr. Ramon Díaz-Arrastia, professor of neurology at the University of Texas (UT) Southwestern Medical Center (Dallas, USA), and senior author of the study, which appears in the May 2008 issue of the journal Archives of Neurology. "No matter how many seat belts and airbags there are, if you hit a tree at 50 miles an hour, you're going to have this kind of injury,” Dr. Díaz-Arrastia said. "It may account for up to half of the traumatic brain injuries from car accidents.”

The injury typically affects the portions of nerve cells in the brain called the axons, the long, thin extensions of nerve cells that reach from one area to another. When the brain is subjected to powerful, inertial forces, axons can be deformed and damaged. This type of trauma, called diffuse axonal injury (DAI) is frequently difficult to diagnose, according to Dr. Díaz-Arrastia.

In the study, the researchers performed MRI analysis on 12 individuals, ranging in age from 16 to 37, who had severe closed-head brain injury, who were either able to give consent or whose legal guardians gave consent. From the patients' point of view, the test was the same as undergoing a standard MRI. The difference was that the researchers used a new mathematical analysis, called diffusion tensor tractography, to detect diffuse axonal injury. They also analyzed the MRI data using an existing method called fluid-attenuated inversion recovery (FLAIR), for fluid attenuation and inversion recovery.

The new study assessed for how easily water could move around in the brain in the areas surrounding cells. When the axons are damaged, they swell, absorbing the water around them and leaving less that can move around between cells. As the axons die, they release the water, resulting in more water surrounding the cells. By comparing multiple MRI images over time, the investigators could identify this change in water motion. Their analysis focused on three areas of the brain--the corpus callosum, the fornix, and the peduncular projections--that consist largely of axons that project from one part of the brain to another.

The researchers evaluated the patients' level of consciousness and ability to care for themselves immediately after their injuries, as well as six to 11 months later. One patient died, and one had fully recovered, with the rest showing partial recovery. One patient could not be located for the follow-up.

In most of the brain areas evaluated, the level of diffuse axonal injury, which is reflected by a reduction of the motion of water around the never cells, was significantly linked to how much the patients improved over time, the researchers found. In contrast, MR FLAIR analysis did not show a statistically significant link with the degree of recovery.

Further studies are under way to include more patients, which will provide more power to the analysis. The researchers will also study other areas of the brain that are at risk for diffuse axonal injury to see whether MRI analysis can be useful in those regions as well.


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88 (57.93571472168): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=284210000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (41.961669921875): 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`
90 (56.028366088867): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (24.795532226562): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (25.98762512207): 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 (23.841857910156): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (23.841857910156): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 4181.8618774414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
105 (102.99682617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
106 (105.85784912109): 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=284210000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (94.890594482422): 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=284210000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (143.05114746094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
109 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
110 (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=284210000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (581.97975158691): 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=284210000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (603.91426086426): 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 (388.14544677734): 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 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
115 (48.160552978516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
116 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
117 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
118 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
119 (86.069107055664): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
120 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
121 (76.055526733398): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
122 (347.13745117188): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 62689.065933228): 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 (!!!!! 3015.9950256348): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=284210000 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=284210000 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (465.86990356445): ( 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 (42.915344238281): ( 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 (51.975250244141): 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 (28.848648071289): 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 (36.954879760742): 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 (29.087066650391): 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 (28.133392333984): 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 (28.133392333984): 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 (29.087066650391): 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 (27.894973754883): 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 (365.9725189209): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (339.98489379883): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (112.05673217773): SELECT name FROM jos_deeppockets WHERE id=212
138 (138.0443572998): SELECT name FROM jos_deeppockets WHERE id=212
139 (954.86640930176): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (506.16264343262): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
142 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
143 (!!!!! 16875.982284546): TRUNCATE TABLE jos_trademed_module
144 (144.00482177734): 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=284210000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (418.90144348145): 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=284210000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (441.07437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 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=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
149 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
150 (!!!!! 1274.1088867188): 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 (95.844268798828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
152 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
153 (51.021575927734): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=284210000 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=284210000 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 (!!!!! 3719.0914154053): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (129.93812561035): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
158 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=284210000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=284210000 AND published='1' LIMIT 1
159 (38.14697265625): select jos_twitters.link from jos_twitters where cat=10
160 (29.087066650391): select jos_facebook.link from jos_facebook where cat=10
161 (29.087066650391): select jos_google_plus.link from jos_google_plus where cat=10
162 (80.108642578125): select jos_linkedin.link from jos_linkedin where cat=10
163 (324.96452331543): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1260.0421905518): insert into jos_banners_delta values (14615,'2025-06-30 16:16:30','216.73.216.249','view'),(14202,'2025-06-30 16:16:30','216.73.216.249','view'),(14203,'2025-06-30 16:16:30','216.73.216.249','view')