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Paradigm Shift in MRI Detection Results in Wider, Clearer Images

By MedImaging International staff writers
Posted on 31 Mar 2009
Unconventional thinking led a Swiss student to make a discovery that could revolutionize magnetic resonance imaging (MRI) technology. He succeeded in exciting and imaging nuclear magnetic resonance in the human body by propagating electromagnetic waves.

It was a colleague's MR images that gave David Brunner, a Ph.D. student from the Institute of Biomedical Engineering of the ETH Zurich (Switzerland) and the University of Zurich, the plan to use propagating waves for MRI. His colleague had taken images of a hand and captured so-called fold-over artifacts that seemed to originate from outside the detector. Clearly, signals were recorded not only from the target region but also from a considerable distance--although the detector was supposed to be sensitive only to its immediate surroundings. "This is only possible if the signals travel, that is, if they propagate as waves," explained Dr. Brunner.

Dr. Klaas Prüssmann, professor at the same institute and Mr. Brunner began to look for the optimal conditions for propagating waves, together with other researchers from ETH Zurich and the University of Zurich. For efficient signal transmission they required a suitable waveguide with a sufficient diameter to support wave propagation. Here, the researchers were helped by a stroke of luck as their strongest magnet with a field strength of 7 Tesla (T), was just wide enough (58 cm) for unhindered propagation at the resonance frequency of 300 MHz. Lined with a conductive material, the magnet's bore effectively acts as a waveguide. An antenna was used to generate propagating waves that penetrated the imaging sample and passed through the entire bore virtually without loss. Resonance signals, again in the form of propagating waves, were recorded by the same antenna, yielding MR images of greater coverage than previously possible at such high fields.

Conventionally, MRI is based upon so-called near-field coupling, for which the detector is placed as close as possible to the body. Stationary radiofrequency fields are used to excite magnetic resonance in hydrogen nuclei. According to theory, a good MRI detector is a resonator with optimal near-field coupling to the sample. However, at 7 T the signal wavelength in tissue is so short, approximately 10 cm, that the stationary radiofrequency fields form node regions, from which no image information can be obtained.

As a consequence, structures that are larger than the wavelength--such as the human head --can no longer be fully covered with the traditional concept. The scientists have now solved this problem by abandoning the stationary approach and instead adopting traveling radiofrequency waves, which do not form field nodes. In their study they show that the new method permits covering large parts of the body more uniformly, while receiving the underlying signals across distances in the meter range.

Current clinical MRI systems typically operate at field strength of 1.5 T, corresponding to a signal frequency of 64 MHz. At this relatively low frequency the traditional, stationary detection principle does not limit coverage because the signal wavelength is much larger. However, compared to higher fields, the current clinical systems are less sensitive, yielding lower spatial resolution. Furthermore, close-range transmitters and detectors are often perceived as uncomfortable by patients and require special precautions to rule out exposure to excessive short-range electric fields in the event of malfunction.

Initial imaging results from a volunteer's lower leg and foot demonstrate more extensive coverage than possible with a traditional detector. "And the fact that MRI signals can be received with an antenna and across such large distances is remarkable; it's a paradigm shift," said Dr. Klaas Prüssmann. The translation into clinical settings will take time, nevertheless. "Unfortunately, the cost of the strong magnets is still substantial and the clinical benefits of very high fields first need to be proven in extensive studies," he says. However, traveling-wave MR detection from large volumes holds potential not only for medical imaging but could also facilitate very different applications. For instance, it may be used to examine large numbers of material samples or small animals in parallel for high-throughput screening.

MRI is the imaging variant of nuclear magnetic resonance (NMR). It is based on an effect that occurs when hydrogen atoms are brought into a strong, static magnetic field and additionally exposed to an oscillating magnetic field in the radiofrequency range. At a certain resonance frequency, the nuclei of the hydrogen atoms respond by oscillating and emitting weak radiofrequency signals themselves. MRI amounts to detecting these signals and rendering them in the form of images. In such depictions the contrast between different tissues reflects different hydrogen content and differences in the nuclei's microscopic surroundings.

The foundations of MRI were laid over 60 years ago by the American Edward M. Purcell and ETH Zurich graduate Felix Bloch through their discovery of NMR. In recognition of this achievement the two researchers jointly received the Nobel Prize in Physics in 1952. NMR went on to revolutionize chemistry and structural biology, including key developments for which the Zurich-based scientists Richard R. Ernst and Kurt Wüthrich received Nobel Prizes in Chemistry.

The study was published in the February 26, 2009, issue of the journal Nature.

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84 (44.822692871094): SELECT show_live FROM jos_com_show_setting LIMIT 1
85 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (109.91096496582): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (!!!!! 3385.066986084): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294722620 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (!!!!! 4328.0124664307): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294722620 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (!!!!! 1273.8704681396): 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 (!!!!! 5659.1033935547): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (!!!!! 4224.7772216797): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (!!!!! 3306.8656921387): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (73.909759521484): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (34.809112548828): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (130.89179992676): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
105 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
106 (72.956085205078): 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=294722620 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (71.048736572266): 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=294722620 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (946.99859619141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
109 (!!!!! 6746.0536956787): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
110 (170.94612121582): 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=294722620 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (609.8747253418): 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=294722620 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (787.97340393066): 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 (737.90550231934): 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 (132.08389282227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
115 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
116 (86.069107055664): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
117 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
118 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
119 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
120 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
121 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
122 (274.8966217041): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 60018.062591553): 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 (650.16746520996): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294722620 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294722620 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 42795.896530151): ( 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 (134.94491577148): ( 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 (66.041946411133): 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 (45.061111450195): 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 (66.041946411133): 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 (!!!!! 3239.1548156738): 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 (473.97613525391): 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 (55.074691772461): 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 (64.849853515625): 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 (67.949295043945): 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 (556.94580078125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (630.85556030273): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (61.03515625): SELECT name FROM jos_deeppockets WHERE id=212
138 (38.14697265625): SELECT name FROM jos_deeppockets WHERE id=212
139 (945.09124755859): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (726.93824768066): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (99.897384643555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
142 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
143 (!!!!! 12407.064437866): TRUNCATE TABLE jos_trademed_module
144 (524.99771118164): 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=294722620 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=294722620 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 3400.0873565674): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (334.9781036377): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (331.16340637207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
149 (584.12551879883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
150 (!!!!! 1873.9700317383): 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 (339.98489379883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
152 (347.13745117188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
153 (751.01852416992): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294722620 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294722620 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (483.03604125977): 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 (!!!!! 1459.8369598389): 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 (49.114227294922): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 1822.9484558105): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
158 (84.877014160156): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722620 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722620 AND published='1' LIMIT 1
159 (!!!!! 3363.8477325439): select jos_twitters.link from jos_twitters where cat=10
160 (51.021575927734): select jos_facebook.link from jos_facebook where cat=10
161 (40.054321289062): select jos_google_plus.link from jos_google_plus where cat=10
162 (38.14697265625): select jos_linkedin.link from jos_linkedin where cat=10
163 (382.1849822998): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1193.0465698242): insert into jos_banners_delta values (14615,'2025-06-29 11:11:14','216.73.216.249','view'),(14202,'2025-06-29 11:11:14','216.73.216.249','view'),(14203,'2025-06-29 11:11:14','216.73.216.249','view')