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MR Technology Provides Radiation-Free Imaging of Childhood Tumors

By MedImaging International staff writers
Posted on 04 Mar 2014
A new imaging approach that searches young cancer patients’ bodies for tumors without exposing them to radiation has been devised that could reduce the children’s’ chance of developing secondary cancers later on in life. The new technique is a modification of magnetic resonance imaging (MRI) that used an innovative contrast agent to find tumors. The MRI-based technology is as effective as cancer-detection scans that use ionizing radiation, specifically, positron emission tomography/computed tomography (PET/CT).

Although whole-body PET-CT technology provides vital data for diagnosing cancer, it has one big downside: A single scan exposes the patient to as much radiation as 700 chest X-rays. This exposure is especially risky for children and teenagers, who are more susceptible to radiation than adults are because they are still growing. Children are also more likely to live long enough to develop a second cancer. “I’m excited about having an imaging test for cancer patients that requires zero radiation exposure,” said senior author Heike Daldrup-Link, MD, associate professor of radiology at Stanford University School of Medicine (Stanford, CA, USA). “That is a big deal.”

The investigators, who published their findings February 18, 2014, in the Lancet Oncology, compared the modified MRI technique to conventional PET-CTs in 22 patients ages 8 to 33 who had lymphoma or sarcoma.

Several obstacles in the past prevented physicians from using whole-body MRI scanning to look for tumors; the scans take up to two hours. A whole-body PET-CT, however, takes only a few minutes and involves capturing PET images monitoring the metabolism of radioactive glucose with CT images. More significantly, in many organs, MRI does not differentiate healthy from cancerous tissue. Furthermore, contrast agents now in use leave the tissues too quickly to be used in a lengthy, whole-body MRI.

To locate tumors using MRI, the researchers used a new contrast agent comprised of iron nanoparticles. Injections of these iron nanoparticles are approved by the US Food and Drug Administration (FDA) to treat anemia, and the researchers obtained FDA permission for the experimental use. The nanoparticles are retained in the body for many days. On MR images, they cause blood vessels to appear brighter, providing anatomic landmarks. The nanoparticles also cause healthy lymph nodes, bone marrow, liver, and spleen to appear darker, making tumors stand out.

The images generated from the research MRI scans provided comparable information to the PET-CT scans that study subjects received as part of their care. The PET-CTs detected 163 of 174 total tumors in the 22 patients; the MRIs found 158 of 174 tumors. The two methods had similar levels of sensitivity, specificity, and diagnostic accuracy. “We were able to find a new way to integrate anatomical and physiological MRI information and make it more efficient,” said Christopher Klenk, MD, a postdoctoral scholar and the study’s lead author.

None of the patients experienced adverse reactions to the iron nanoparticles, though the US Food and Drug Administration (FDA) has previously noted a small risk of allergic reaction to the nanoparticles’ coating. In addition, seldom do patients to have adverse reactions to other contrast agents.

Radiologists at several academic hospitals are looking for ways to reduce children’s radiation exposure, according to Dr. Daldrup-Link, adding that she is sharing the new technique with colleagues in the United States. “Some type of whole-body MRI imaging test is available at many big children’s hospitals right now,” she said, adding that for such techniques to be widely adopted, doctors are asking for evidence that whole-body MRI does the job. “It’s slowly entering clinical practice, but clinicians are cautious and want to be convinced, she added. The other hurdle to wide adoption of MRI-based scanning is lack of a billing code, a drawback the researchers hope will soon be fixed. But there are no technologic obstacles to use of the new technique. “It’s really exciting that this will soon be clinically applicable,” Dr. Daldrup-Link said.

Future studies, according to the investigators, will be done to confirm the MRI-based technology in larger, more diverse groups of cancer patients, as well as to study its possible use for monitoring tumors over the course of cancer treatment. Moreover, the MRI-based strategy has potential for scanning patients after their treatment is complete, when the ability to monitor them without radiation would be particularly beneficial.

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86 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (51.021575927734): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294751022 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (35.04753112793): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294751022 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (34.809112548828): 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 (59.127807617188): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (37.193298339844): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (221.01402282715): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (32.186508178711): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (759.12475585938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
105 (!!!!! 1221.8952178955): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
106 (121.11663818359): 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=294751022 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (65.803527832031): 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=294751022 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (289.9169921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
109 (137.0906829834): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
110 (74.148178100586): 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=294751022 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (936.03134155273): 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=294751022 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (657.08160400391): 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 (362.15782165527): 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 (103.95050048828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
115 (87.02278137207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
116 (92.983245849609): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
117 (123.02398681641): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
118 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
119 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
120 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
121 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
122 (481.12869262695): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 187742.9485321): 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 (!!!!! 7677.0782470703): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294751022 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294751022 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 40037.155151367): ( 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 (!!!!! 7975.1014709473): ( 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 (!!!!! 15765.190124512): 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 (!!!!! 7972.0020294189): 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 (!!!!! 7791.9960021973): 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 (!!!!! 7875.919342041): 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 (!!!!! 7936.954498291): 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 (!!!!! 7955.0743103027): 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 (!!!!! 3789.9017333984): 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 (!!!!! 7997.0359802246): 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 (754.83322143555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 1036.8824005127): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (512.83836364746): SELECT name FROM jos_deeppockets WHERE id=212
138 (40.054321289062): SELECT name FROM jos_deeppockets WHERE id=212
139 (!!!!! 2187.967300415): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 1282.9303741455): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 1974.8210906982): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
142 (552.17742919922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
143 (!!!!! 20695.209503174): TRUNCATE TABLE jos_trademed_module
144 (205.03997802734): 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=294751022 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (!!!!! 3867.8646087646): 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=294751022 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 1169.9199676514): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (80.82389831543): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (380.9928894043): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
149 (821.82884216309): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
150 (!!!!! 1981.0199737549): 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 (117.77877807617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
152 (256.06155395508): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
153 (869.9893951416): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294751022 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294751022 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (173.09188842773): 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 (792.02651977539): 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 (57.93571472168): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 1121.997833252): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
158 (704.05006408691): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294751022 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294751022 AND published='1' LIMIT 1
159 (!!!!! 4395.9617614746): select jos_twitters.link from jos_twitters where cat=10
160 (45.061111450195): 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 (199.0795135498): select jos_linkedin.link from jos_linkedin where cat=10
163 (!!!!! 4853.0101776123): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1374.0062713623): insert into jos_banners_delta values (14615,'2025-06-24 06:55:38','216.73.216.120','view'),(14202,'2025-06-24 06:55:38','216.73.216.120','view'),(14203,'2025-06-24 06:55:38','216.73.216.120','view')