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Diffusion Tensor MRI Reveals Brain Connection Failure in Early Alzheimer’s Disease

By MedImaging International staff writers
Posted on 14 Dec 2014
Diffusion tensor imaging (DTI) has been shown to reveal changes in white matter connections in the brains of patients with early Alzheimer’s disease (AD). More...
White matter connections are vital for conducting communication across the billions of nerve cells in the brain. DTI may provide help in assessing brain injury in early AD and tracking the effect of new therapies.

According to the researchers, changes in brain connections visible on DTI magnetic resonance imaging (MRI) scans could represent an imaging biomarker of AD, according to the findings that were presented December 1, 2014, at the annual meeting of the Radiological Society of North America (RSNA), held in Chicago (IL, USA).

AD is the most typical form of dementia. As many as five million Americans are affected, a number expected to grow to 14 million by 2050, according to the US Centers for Disease Control and Prevention (Atlanta, GA, USA). Preventive treatments may be most effective before AD is diagnosed, such as when an individual is suffering from mild cognitive impairment (MCI), a decline in cognitive skills that is noticeable but not severe enough to affect independent function. Earlier efforts at early detection have focused on beta amyloid, a protein found in abnormally high amounts in the brains of individuals with AD.

For the new study, researchers looked at the brain’s structural connectome, a map of white matter tracts that carry signals between different areas of the brain. “The structural connectome provides us with a way to characterize and measure these connections and how they change through disease or age,” said study coauthor Jeffrey W. Prescott, MD, PhD, radiology resident at Duke University Medical Center (Durham, NC, USA).

Dr. Prescott and colleagues analyzed study findings from 102 patients enrolled in a national study called the Alzheimer’s Disease Neuroimaging Initiative (ADNI) 2. The patients had undergone diffusion tensor imaging (DTI), an MRI method that assesses the integrity of white matter tracts in the brain by measuring how easy it is for water to move along them. “It is known that water prefers moving along the defined physical connections between regions in the brain, which makes DTI a great tool for evaluating the structural connectome,” Dr. Prescott said.

The researchers compared alterations in the structural connectome with findings from florbetapir positron emission tomography (PET) imaging, a technique that measures the amount of beta amyloid plaque in the brain. Increased florbetapir uptake corresponds with greater amounts of the protein. The findings revealed a strong association between florbetapir uptake and decreases in strength of the structural connectome in each of the five areas of the brain studied.

“This study ties together two of the major changes in the brains of AD patients, structural tissue changes and pathological amyloid plaque deposition, and suggests a promising role for DTI as a possible diagnostic adjunct,” Dr. Prescott said.

Based on these findings, DTI may offer a role in evaluating brain damage in early AD and monitoring the effect of new therapies. “Traditionally, Alzheimer’s disease is believed to exert its effects on thinking via damage to the brain’s gray matter, where most of the nerve cells are concentrated,” said Jeffrey R. Petrella, MD, professor of radiology at Duke and senior author on the study. “This study suggests that amyloid deposition in the gray matter affects the associated white matter connections, which are essential for conducting messages across the billions of nerve cells in the brain, allowing for all aspects of mental function.”

“We suspect that as amyloid plaque load in the gray matter increases, the brain's white matter starts to break down or malfunction and lose its ability to move water and neurochemicals efficiently,” added Dr. Prescott.

The researchers plan to continue examining this cohort of patients over time to gain a better determination of how the disease evolves in individual patients. They also intend to integrate functional imaging into their research to learn about how the relationship between function and structure is affected with increasing amyloid burden.

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Duke University Medical Center



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89 (40.054321289062): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294756192 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (42.915344238281): 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 (78.916549682617): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (47.206878662109): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (60.081481933594): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
106 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
107 (56.028366088867): 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=294756192 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (63.896179199219): 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=294756192 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (91.075897216797): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
110 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
111 (51.975250244141): 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=294756192 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (731.9450378418): 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=294756192 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (644.92225646973): 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 (545.02487182617): 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 (162.12463378906): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
116 (83.92333984375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
117 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
118 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
119 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
120 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
121 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
122 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
123 (495.19538879395): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
124 (!!!!! 27283.906936646): 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 (820.15991210938): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294756192 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294756192 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 10760.78414917): ( 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 (140.90538024902): ( 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 (98.943710327148): 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 (69.856643676758): 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 (97.990036010742): 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 (57.93571472168): 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 (496.14906311035): 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 (71.048736572266): 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 (72.956085205078): 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 (52.928924560547): 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 (635.14709472656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (549.7932434082): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (78.916549682617): SELECT name FROM jos_deeppockets WHERE id=212
139 (46.968460083008): SELECT name FROM jos_deeppockets WHERE id=212
140 (858.06846618652): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (858.06846618652): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (125.16975402832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
143 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
144 (!!!!! 14479.160308838): TRUNCATE TABLE jos_trademed_module
145 (156.87942504883): 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=294756192 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (87.976455688477): 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=294756192 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (674.00932312012): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (112.05673217773): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
150 (69.856643676758): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
151 (!!!!! 1802.921295166): 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 (118.97087097168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
153 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
154 (63.896179199219): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294756192 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294756192 AND type='deeppockets_item' AND published='1' LIMIT 1
155 (42.915344238281): 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 (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)
157 (50.067901611328): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
158 (106.0962677002): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
159 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294756192 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294756192 AND published='1' LIMIT 1
160 (64.849853515625): select jos_twitters.link from jos_twitters where cat=10
161 (41.961669921875): select jos_facebook.link from jos_facebook where cat=10
162 (37.908554077148): select jos_google_plus.link from jos_google_plus where cat=10
163 (38.14697265625): select jos_linkedin.link from jos_linkedin where cat=10