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Cause of Vertigo from MRI Scanning Identified

By MedImaging International staff writers
Posted on 05 Oct 2011
A team of researchers reported that it has discovered why so many people undergoing magnetic resonance imaging (MRI), particularly in newer high-strength scanners, get vertigo, or the dizzy sensation of free falling, while inside or when coming out of the tunnel-like machine.

In a new study published online September 22, 2011, in the journal Current Biology, a team led by Johns Hopkins University’s (JHU; Baltimore, MD, USA) scientists suggests that MRI scanner’s strong magnet pushes on fluid that circulates in the inner ear’s balance center, leading to a feeling of unexpected or unsteady movement. The finding could also call into question results of so-called functional MRI studies designed to detect what the brain and mind are doing under various circumstances.

To determine the mechanism behind MRI-induced vertigo, Dale C. Roberts, MS, senior research systems engineer in the laboratory of David Zee, MD, within the department of neurology at the Johns Hopkins University School of Medicine, and his colleagues placed 10 volunteers with healthy labyrinths and 2 volunteers who lacked labyrinthine function into MRI scanners. They tracked vertigo not only by the volunteers’ reports, but also by looking for nystagmus. Because visual clues can help suppress nystagmus, the researchers conducted their experiments in the dark.

Footage from night vision cameras revealed that all the healthy volunteers had nystagmus in the MRI, but those without labyrinthine function did not a definite sign that the labyrinth plays a key role in MRI-related vertigo. To determine how MRI’s magnetic field acts on the labyrinth, the researchers tested the healthy volunteers in MRI scanners of different strengths for various periods of time. They also tracked the study participants’ nystagmus as they were moved in and out of the scanners’ tunnels, called bores, both from the usual entryway and from behind research designed to assess the impact of motion or direction of magnetic field on the volunteers’ balance centers.

Mr. Roberts’ team discovered that higher magnetic field strengths caused considerably faster nystagmus. These eye movements persisted throughout the time volunteers spent in the machine, no matter how long the experiments lasted. Moreover, the direction of the eye movements changed depending on which way the volunteers entered the bores, suggesting that the effect on the labyrinth was directionally sensitive.

Combining their findings with what is known about the inner ear, the researchers deduced that MRI-related vertigo most likely relates to interplay between electrical currents flowing through the salty fluid in the canals of the labyrinth and MRI’s magnetic field. Through an effect well known to physicists called the Lorentz force, the magnetic field apparently pushes on the current of charged particles in the inner ear’s fluid. This exerts a force on cells that use the fluid’s flow as a way to perceive motion.

Mr. Roberts noted that the finding not only answers a decades-long scientific question, but also has implications for research that uses MRI. In one technique, known as functional MRI (fMRI), researchers measure brain activity by tracking blood flow in the brain as participants perform tasks. The new findings suggest that the scanner itself could be causing previously unnoticed brain activity related to movement and balance, potentially affecting results.

“We’ve shown that even when you think there’s nothing happening in the brain while volunteers are in the scanner, there’s actually a lot happening because MRI itself is causing some effect,” Mr. Roberts said. “These effects must be taken into account in the way we interpret functional imaging.”

The researchers added that physicians already use methods that stimulate the labyrinth to diagnose and treat inner ear and balance disorders, but these methods can be uncomfortable. They note that MRI scanners strong magnetic field could eventually be used for the same purpose, providing an innovative approach that is more comfortable and noninvasive.

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89 (31.948089599609): 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 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
105 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
106 (49.829483032227): 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=294737427 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (46.014785766602): 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=294737427 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
109 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
110 (44.822692871094): 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=294737427 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (486.85073852539): 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=294737427 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (449.89585876465): 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 (303.98368835449): 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 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
115 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
116 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
117 (38.862228393555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
118 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
119 (35.04753112793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
120 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
121 (36.954879760742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
122 (165.93933105469): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 46175.956726074): 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 (490.90385437012): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294737427 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294737427 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 24305.105209351): ( 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 (154.01840209961): ( 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 (440.83595275879): 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 (115.87142944336): 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 (74.863433837891): 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 (244.8558807373): 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 (792.9801940918): 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 (87.02278137207): 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 (!!!!! 1327.9914855957): 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 (36.954879760742): 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 (465.86990356445): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (309.94415283203): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (186.20491027832): SELECT name FROM jos_deeppockets WHERE id=212
138 (32.901763916016): SELECT name FROM jos_deeppockets WHERE id=212
139 (514.03045654297): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (480.89027404785): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
142 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
143 (!!!!! 7154.9415588379): TRUNCATE TABLE jos_trademed_module
144 (75.101852416992): 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=294737427 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (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=294737427 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (746.01173400879): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
149 (38.862228393555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
150 (!!!!! 1003.0269622803): 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 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
152 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
153 (32.901763916016): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294737427 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294737427 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (28.848648071289): 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 (30.040740966797): 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 (28.133392333984): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
158 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737427 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737427 AND published='1' LIMIT 1
159 (36.001205444336): select jos_twitters.link from jos_twitters where cat=10
160 (30.994415283203): select jos_facebook.link from jos_facebook where cat=10
161 (30.994415283203): 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 (267.98248291016): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (868.79730224609): insert into jos_banners_delta values (14615,'2025-06-26 23:36:43','216.73.216.249','view'),(14202,'2025-06-26 23:36:43','216.73.216.249','view'),(14203,'2025-06-26 23:36:43','216.73.216.249','view')