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Ultrasound Imaging Quality Greatly Improved by Unique Metamaterial

By MedImaging International staff writers
Posted on 08 Dec 2010
Scientists have found a way to overcome one of the major limitations of ultrasound imaging--the poor resolution of the image. More...


One of the limits of ultrasound imaging is that the detail obtainable is the frequency of the sound: The fundamental laws of physics dictate that the smallest objects one can "see” are about the size of the wavelength of the sound waves. For ultrasound of deep tissues in the body, for example, the sound waves are typically 1 MHz - 5 MHz--much higher than what humans can hear--which imposes a resolution limit of approximately 1 mm.

In an article appearing online in November 2010 in the journal Nature Physics, physicists at the University of California, Berkeley (UCB; USA) and the Universidad Autonoma de Madrid (Spain) demonstrate how to capture the evanescent waves bouncing off an object to reconstruct detail as small as one-fiftieth of the wavelength of the sound waves. Evanescent sound waves are vibrations near the object that dim out within a very short distance, as opposed to propagating waves, which can travel over a long distance.

"With our device, we can pick up and transmit the evanescent waves, which contain a substantial fraction of the ultra-subwavelength information from the object, so that we can realize super-resolution acoustic imaging,” said first author Dr. Jie Zhu, a postdoctoral fellow in the Center for Scalable and Integrated NanoManufacturing (SINAM), a National Science Foundation-funded Nanoscale Science and Engineering Center at UCB.

The researchers refer to their device for capturing evanescent waves as a three-dimensional, holey-structured metamaterial. It consists of 1,600 hollow copper tubes bundled into a 16-cm bar with a square cross-section of 6.3 cm. Placed close to an object, the structure captures the evanescent waves and pipes them through to the opposite end.

In a practical device, according to Dr. Zhu, the metamaterial could be mounted on the end of an ultrasound probe to improve the image resolution. The device would also improve underwater sonography, or sonar, as well as nondestructive assessment in industry applications.

"For ultrasound detection, the image resolution is generally in the millimeter range,” said coauthor Dr. Xiaobo Yin. "With this device, resolution is only limited by the size of the holes.”

In the researchers' study, the holes in the copper tubes were approximately 1 mm in diameter. Using acoustic waves of about 2 kHz, the resolution of an image would normally be limited to the wavelength, or 200 mm. With their holey-structured metamaterial, they can resolve the feature size as small as 4 mm, or one-fiftieth of a wavelength. "Without the metamaterial, it would be impossible to detect such a deep subwavelength object at all,” Dr. Yin stated.

Related Links:
University of California, Berkeley
Universidad Autonoma de Madrid


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88 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
89 (!!!!! 2244.9493408203): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294732391 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (89.883804321289): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294732391 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
91 (!!!!! 1910.924911499): 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`
92 (72.002410888672): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (37.193298339844): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (367.87986755371): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (64.13459777832): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (37.193298339844): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (45.7763671875): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (!!!!! 1685.8577728271): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
107 (!!!!! 2090.2156829834): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
108 (705.00373840332): 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=294732391 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (625.1335144043): 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=294732391 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
110 (144.95849609375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
111 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
112 (521.18301391602): 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=294732391 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (515.93780517578): 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=294732391 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
114 (859.97581481934): 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
115 (690.93704223633): 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
116 (185.01281738281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
117 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
118 (96.08268737793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
119 (69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
120 (918.86520385742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
121 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
122 (265.12145996094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
123 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
124 (284.91020202637): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 69271.087646484): 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
126 (694.99015808105): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294732391 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294732391 AND type='deeppockets_item' AND published='1' LIMIT 1
127 (!!!!! 21523.952484131): ( 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
128 (63.896179199219): ( 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
129 (474.92980957031): 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
130 (55.074691772461): 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
131 (581.97975158691): 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
132 (171.89979553223): 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
133 (318.05038452148): 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
134 (161.88621520996): 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
135 (884.05609130859): 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
136 (62.942504882812): 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
137 (!!!!! 2407.0739746094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (463.96255493164): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (205.99365234375): SELECT name FROM jos_deeppockets WHERE id=214
140 (53.882598876953): SELECT name FROM jos_deeppockets WHERE id=214
141 (730.03768920898): 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 '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (627.99453735352): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (!!!!! 1370.906829834): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
144 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
145 (!!!!! 28143.882751465): TRUNCATE TABLE jos_trademed_module
146 (166.17774963379): 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=294732391 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (919.10362243652): 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=294732391 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (!!!!! 8347.9881286621): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (150.91896057129): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (!!!!! 1851.0818481445): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
151 (118.97087097168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
152 (!!!!! 1588.8214111328): 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
153 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
154 (822.06726074219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
155 (!!!!! 3330.9459686279): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294732391 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294732391 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (838.9949798584): 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=214 or channel_id is null)
157 (234.12704467773): 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=214 or channel_id is null)
158 (!!!!! 3854.9900054932): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (133.03756713867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
160 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294732391 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294732391 AND published='1' LIMIT 1
161 (319.00405883789): select jos_twitters.link from jos_twitters where cat=10
162 (113.01040649414): select jos_facebook.link from jos_facebook where cat=10
163 (648.97537231445): select jos_google_plus.link from jos_google_plus where cat=10
164 (46.968460083008): select jos_linkedin.link from jos_linkedin where cat=10