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New Type of MRI Could Evaluate Plaque in Blood Vessels

By MedImaging International staff writers
Posted on 26 Aug 2008
Physicists who recently have invented a new type of magnetic resonance imaging (MRI) technique reported that this advance might ultimately enable the development of extremely small computers, and even give clinicians a new tool for evaluating the plaque in blood vessels that play a role in diseases such as heart disease.

In the July 18, 2008, issue of the journal Physical Review Letters, the scientists reported the first-ever MR image of the inside of an extremely tiny magnet. "The magnets we study are basically the same as a refrigerator magnet, only much smaller,” said project leader Chris Hammel, Ohio Eminent Scholar in Experimental Physics at Ohio State University (Columbus, USA). The disk-shaped magnets in this study measured only two micrometers across. "Because ferromagnets generate such strong magnetic fields, we can't study them with typical MRI. A related technique, ferromagnetic resonance, or FMR, would work, but it's not sensitive enough to study individual magnets that are this small.”

Similarly, medical researchers cannot use MRI to image plaques formed in the body, because plaques are too small. This is why this new kind of MRI could eventually become a tool for biomedical research. The technique combines three different kinds of technology: MRI, FMR, and atomic force microscopy.

The investigators called the technique scanned probe ferromagnetic resonance force microscopy, or scanned probe FMRFM, and it involves detecting a magnetic signal using a tiny silicon bar with an even tinier magnetic probe on its tip. As the probe passes over a material, it captures a bowl-shaped image: a curved cross-section of an object. The magnetic signal is more intense in the middle (the "bottom” of the bow"), and fades away toward the edges.

This may appear like an odd configuration, but that is why the new technique works.
Every atom emits radio waves at a particular frequency. But to know where those atoms are, scientists need to be able to localize where the radio waves are coming from; similar to the way in which large-scale hospital-type MRI machines get around this problem by varying the magnetic field by precise amounts as it sweeps over an object. The computer controlling the MRI knows where the magnetic field equals X, the location equals Y; advanced software combines the data, and clinicians obtain a three-dimensional (3D) view inside a patient's body.

For Dr. Hammel's tiny magnets, no techniques were previously known that would image the inside of them, much less allow for precise localization. But since the new probe system generates a magnetic field that varies naturally, the physicists discovered that they could sweep the probe over an array of magnets and obtain a 2D view that's similar to a medical MRI.

In the published study, the researchers reported an image resolution of 250 nanometers. Now that they have their imaging technique, Dr. Hammel and his coworkers are beginning to record the characteristics of many different kinds of tiny magnets--a crucial first step toward developing them for computer memory. Experts believe that one day, tiny magnets could be "implanted” on a computer's central processing unit (CPU) chip. Because system data could be recorded on the magnets, such a computer would never need to boot up as its memory would persist. It would also be very small; essentially, the entire computer could be contained in the CPU.

For biomedical research purposes, the technique could be used to examine tissue samples taken from plaques that form in brain tissues and arteries in the body. Many diseases are associated with plaques, including Alzheimer's and atherosclerosis. Currently, researchers are trying to assess the structure of plaques in detail to better determine how they form and how they affect traditional MRI images.

Dr. Hammel and his team hope to contribute to the development of an instrument that could be sold and used routinely in laboratories. But the technique needs some further development before it could become an everyday tool for the computer industry or for biomedicine.

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89 (38.862228393555): 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 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.894973754883): 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 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (101.08947753906): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
105 (69.856643676758): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
106 (84.877014160156): 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=294720091 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (74.863433837891): 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=294720091 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (98.943710327148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
109 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
110 (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.id=294720091 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (466.10832214355): 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=294720091 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (740.05126953125): 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 (797.98698425293): 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 (333.78601074219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
115 (231.98127746582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
116 (155.92575073242): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
117 (119.20928955078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
118 (144.95849609375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
119 (96.08268737793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
120 (482.08236694336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
121 (289.9169921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
122 (324.01084899902): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 30670.881271362): 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 (519.0372467041): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294720091 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294720091 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 7400.0358581543): ( 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 (67.949295043945): ( 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 (266.79039001465): 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 (33.855438232422): 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 (213.8614654541): 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 (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
131 (230.07392883301): 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 (208.85467529297): 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 (32.901763916016): 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 (616.07360839844): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (430.82237243652): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (278.94973754883): SELECT name FROM jos_deeppockets WHERE id=212
138 (49.114227294922): SELECT name FROM jos_deeppockets WHERE id=212
139 (810.14633178711): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (747.9190826416): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
142 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
143 (!!!!! 10480.165481567): TRUNCATE TABLE jos_trademed_module
144 (81.777572631836): 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=294720091 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (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_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=294720091 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (387.90702819824): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
149 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
150 (!!!!! 1157.9990386963): 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 (85.830688476562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
152 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
153 (37.908554077148): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294720091 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294720091 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (34.093856811523): 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 (31.948089599609): 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 (33.855438232422): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (159.97886657715): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
158 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294720091 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294720091 AND published='1' LIMIT 1
159 (91.075897216797): select jos_twitters.link from jos_twitters where cat=10
160 (33.855438232422): select jos_facebook.link from jos_facebook where cat=10
161 (32.901763916016): select jos_google_plus.link from jos_google_plus where cat=10
162 (33.140182495117): select jos_linkedin.link from jos_linkedin where cat=10
163 (327.11029052734): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (854.9690246582): insert into jos_banners_delta values (14615,'2025-06-30 06:22:26','216.73.216.249','view'),(14202,'2025-06-30 06:22:26','216.73.216.249','view'),(14203,'2025-06-30 06:22:26','216.73.216.249','view')