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Research Shows MRI Poses No More Than Minimal Risk in Children

By MedImaging International staff writers
Posted on 27 Oct 2011
Providing insights on an issue that has perplexed research ethics review boards, a new analysis of the use of magnetic resonance imaging (MRI) in pediatric clinical trials found that the risks of physical and psychological harm tied to this procedure are no greater than the risks that healthy children face from everyday activities, such as playing soccer or riding in motor vehicles. However, adding an intravenous contrast dye or sedation to an MRI increases the chances of harm and makes them unacceptably high.

These findings are significant because they clarify which kinds of MRI studies meet the “minimal-risk standard,” which ethics review boards use to determine if a study can continue. The report was published in the September/October 2011 issue of the IRB: Ethics & Human Research, a journal of the Hastings Center.

MRI offers researchers exceptional views inside the human body, but it also poses risks, including physical injury from the strong magnetic forces and psychological harm such as anxiety. For their risk analysis of the procedure, the authors considered the risks from MRI alone, as well as the risks from contrast-enhancing agents and sedation, which are sometimes used with MRI scans. The researchers also evaluated systematic reviews of the risks from several everyday activities of healthy children.

The researchers discovered that the risk of physical injury from MRI is 17 per 100,000 examinations and that the risk of death is four per 100 million examinations. In contrast, the risk of injury in children under the age of 16 from a wide variety of sports and recreation activities ranges from 4 per 100,000 hours of participation in soccer to 12,730 per 100,000 hours of playing ice hockey. Assuming that an MRI examination lasts an hour, the risk of injury associated with an MRI falls within the lower end of this range, the authors wrote.

The investigators also compared the death rates of children undergoing MRI scans versus children riding in motor vehicles, which poses the highest risk of mortality to healthy children. The motor vehicle risk ranges from six deaths per 100 million car trips for children ages 14 years and younger to 40 per 100 million for children ages 15 to 19. “Thus, the risk of death from an MRI examination [four per 100 million] is clearly less than the risk of death from a car trip,” the authors concluded.

As for psychologic harm, in studies of children ages 10 to 18 years old who had MRI scans, 12% reported that they felt disturbed by the confined space, 16% said they were bothered by the noise, and 1.2% could not complete their MRI scan due to claustrophobia. But these percentages were lower on average than the percentages of children who report fears associated with anxiety disorders--in one study of children 8 to 13 years of age, for example, 49% reported fears associated with subclinical anxiety and 22% met the full criteria of an anxiety disorder.

When an MRI scan calls for the injection of a contrast dye, there is the risk of allergic reactions, such as fever, headache, and anaphylaxis. The authors compared these risks with the risk of allergic reactions following routine vaccinations: while the risk of local and minor systemic reactions from MRI contrast dyes (4% to 6%) is comparable to the risk of minor reactions from routine vaccinations, the risk of anaphylaxis from MRI contrast dyes (7.5 per 100,000 doses) is higher than the risk of anaphylaxis from vaccinations. “MRI with contrast enhancement therefore does not meet the minimal-risk standard,” they stated.

The investigators also concluded that the risk from sedation in MRI protocols, which includes gastrointestinal complaints (18% to 37%) and motor imbalance (66% to 85%), does not meet the minimal-risk standard, based in the risks posed by sedating medications such as over-the-counter cold medicines.

“We urge researchers and REBs [research ethics review boards] to collaborate in the ongoing effort to minimize the risk of harm and discomfort associated with pediatric MRI research,” wrote the authors: Matthias H. Schmidt, MD, FRCP, of Dalhousie University (Halifax, Nova Scotia, Canada); Jennifer Marshall, MSc, of the University of Toronto (Canada); Jocelyn Downie, LLB, LLM, SJD, of Dalhousie University, and Michael R. Hadskis, LLB, LLM, of Dalhousie University.

Related Links:
Dalhousie University
University of Toronto



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88 (31.948089599609): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294737788 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (35.04753112793): 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 (51.975250244141): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (29.802322387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (84.161758422852): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
105 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
106 (68.902969360352): 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=294737788 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (58.174133300781): 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=294737788 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (93.936920166016): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
109 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
110 (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 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=294737788 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (510.93101501465): 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=294737788 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (525.95138549805): 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 (307.08312988281): 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 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
115 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
116 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
117 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
118 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
119 (37.193298339844): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
120 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
121 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
122 (269.17457580566): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 18933.057785034): 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 (468.96934509277): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294737788 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294737788 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 7632.0171356201): ( 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 (69.141387939453): ( 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 (424.14665222168): 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 (46.014785766602): 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 (230.78918457031): 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 (33.855438232422): 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 (185.01281738281): 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 (31.948089599609): 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 (175.95291137695): 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 (32.186508178711): 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 (308.03680419922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (232.93495178223): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (113.01040649414): SELECT name FROM jos_deeppockets WHERE id=212
138 (30.040740966797): SELECT name FROM jos_deeppockets WHERE id=212
139 (591.03965759277): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (524.99771118164): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
142 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
143 (!!!!! 11753.082275391): TRUNCATE TABLE jos_trademed_module
144 (607.01370239258): 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=294737788 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (77.962875366211): 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=294737788 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 1142.0249938965): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (302.07633972168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
149 (355.00526428223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
150 (!!!!! 1665.8306121826): 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 (329.97131347656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
152 (59.843063354492): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
153 (591.99333190918): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294737788 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294737788 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (47.922134399414): 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 (36.001205444336): 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 (51.021575927734): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (524.99771118164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
158 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294737788 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294737788 AND published='1' LIMIT 1
159 (44.822692871094): select jos_twitters.link from jos_twitters where cat=10
160 (29.087066650391): select jos_facebook.link from jos_facebook where cat=10
161 (30.040740966797): select jos_google_plus.link from jos_google_plus where cat=10
162 (29.087066650391): select jos_linkedin.link from jos_linkedin where cat=10
163 (246.04797363281): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1096.9638824463): insert into jos_banners_delta values (14615,'2025-06-26 18:16:04','216.73.216.249','view'),(14202,'2025-06-26 18:16:04','216.73.216.249','view'),(14203,'2025-06-26 18:16:04','216.73.216.249','view')