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Needle-Sized Wireless Device Created to Track Tumors, Radiation Dose

By MedImaging staff writers
Posted on 08 May 2008
Engineers have developed a wireless device designed to be injected into tumors that will inform clinicians on the exact dose of radiation received and locate the exact position of tumors during treatment.

The information gleaned from this device would help to kill tumors more effectively, according to Dr. Babak Ziaie, an associate professor in the School of Electrical and Computer Engineering and a researcher at Purdue University's (West Lafayette, IN, USA) Birck Nanotechnology Center.

Dr. Ziaie is leading a team that has evaluated a prototype wireless implantable passive micro-dosimeter and reported that the device could be in clinical trials in 2010. "Because organs and tumors shift inside the body during treatment, a new technology is needed to tell doctors the exact dosage of radiation received by a tumor,” Dr. Ziaie said.

The prototype is enclosed in a glass capillary small enough to inject into a tumor with a syringe, according to Dr. Ziaie. Research findings were detailed in an article appearing in the June 2007 issue of IEEE Transactions on Biomedical Engineering. The article was written by doctoral student Chulwoo Son and Dr. Ziaie.

Whereas conventional imaging systems can provide a three-dimensional fix on a tumor's shifting position during therapy, these methods are difficult to use during radiation therapy, are costly and sometimes require X-rays, which can damage tissue when used repeatedly, according to Dr. Ziaie said.

The new device uses radio frequency identification (RFID) technology, which does not emit damaging X-rays. The device has no batteries, is activated with electrical coils placed next to the patient, and contains a miniature version of dosimeters worn by workers in occupations involving radioactivity. The tiny dosimeter could provide up-to-date information about the cumulative dose a tumor is receiving over time.

"It's a radiation dosimeter and a tracking device in the same capsule and will be hermetically sealed so that it will not have to be removed from the body,” Dr. Ziaie said. The same researchers in 2006 reported findings on the first such miniature device. However, Dr. Ziaie reported that the earlier prototype lacked sufficient sensitivity, was too large, and not suitable for easy implantation.

New findings revealed the development of a miniaturized and more sensitive dosimeter that can be implanted using a hypodermic needle. Researchers tested the prototype with radioactive cobalt. Over that next two years, the engineers will work to simplify the fabrication process so that the devices could be manufactured inexpensively.

A major advantage of the technology is that it does not require complicated circuitry, which could make the device easier and less expensive to manufacture than designs that are more complex. The system consists of simple electronic devices called capacitors and coils.

The device has a diameter of approximately 2.5 mm and is about 2 cm long, making it small enough to fit inside a large-diameter needle for injection with a syringe. The current size is small enough to be used in tumors, but researchers will work to shrink the device to about half a millimeter in diameter and to half its current length, roughly the size of a rice grain, according to Dr. Ziaie.


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96 (831.12716674805): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (728.13034057617): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (244.140625): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (!!!!! 1749.9923706055): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (71.048736572266): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (359.77363586426): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (48.160552978516): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 6432.056427002): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
105 (!!!!! 3375.768661499): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
106 (!!!!! 4437.9234313965): 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=280820000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (!!!!! 3158.0924987793): 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=280820000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 1202.1064758301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
109 (85.115432739258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
110 (!!!!! 9048.9387512207): 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=280820000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (781.05926513672): 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=280820000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 1408.1001281738): 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 (!!!!! 1023.0541229248): 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 (!!!!! 2388.0004882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
115 (!!!!! 5664.8254394531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
116 (!!!!! 1322.9846954346): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
117 (88.930130004883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
118 (!!!!! 2729.8927307129): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
119 (97.036361694336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
120 (734.09080505371): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
121 (!!!!! 3873.1098175049): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
122 (764.84680175781): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 48454.04624939): 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 (!!!!! 1185.8940124512): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=280820000 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=280820000 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (385.99967956543): ( 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 (355.95893859863): ( 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 (444.88906860352): 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 (386.95335388184): 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 (926.97143554688): 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 (!!!!! 1283.8840484619): 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 (432.96813964844): 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 (532.15026855469): 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 (643.96858215332): 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 (!!!!! 1904.0107727051): 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 (457.0484161377): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (277.04238891602): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (39.815902709961): SELECT name FROM jos_deeppockets WHERE id=213
138 (30.994415283203): SELECT name FROM jos_deeppockets WHERE id=213
139 (597.00012207031): 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 '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (460.86311340332): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 3316.1640167236): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
142 (89.883804321289): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
143 (!!!!! 13350.009918213): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 1694.2024230957): 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=280820000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (!!!!! 5675.0774383545): 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=280820000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (511.88468933105): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (54.836273193359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (!!!!! 2068.042755127): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
149 (79.154968261719): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
150 (!!!!! 1409.0538024902): 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 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
152 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
153 (521.89826965332): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=280820000 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=280820000 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (52.928924560547): 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=213 or channel_id is null)
155 (38.14697265625): 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=213 or channel_id is null)
156 (309.94415283203): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 3751.9931793213): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
158 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=280820000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=280820000 AND published='1' LIMIT 1
159 (102.99682617188): select jos_twitters.link from jos_twitters where cat=10
160 (48.160552978516): select jos_facebook.link from jos_facebook where cat=10
161 (46.014785766602): select jos_google_plus.link from jos_google_plus where cat=10
162 (42.915344238281): select jos_linkedin.link from jos_linkedin where cat=10