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Novel Imaging Technology Improves Image Quality, Lessens Radiation

By MedImaging International staff writers
Posted on 30 Aug 2012
Image: Particle physicists Erlend Bolle, David Volgyes, Michael Rissi and Kim-Eigard Hines, developers of the new technology that enables multiple improvements, including 50 % less radiation from a PET scanner. (Photo courtesy of Yngve Vogt, University of Oslo.)
Image: Particle physicists Erlend Bolle, David Volgyes, Michael Rissi and Kim-Eigard Hines, developers of the new technology that enables multiple improvements, including 50 % less radiation from a PET scanner. (Photo courtesy of Yngve Vogt, University of Oslo.)
Particle physicists have created a novel imaging technology that includes combining the PET and MRI technologies in a way that involves much less radiation than current technology.

Many cancer patients must be examined multiple times to check whether treatment is effective, resulting in very high total radiation exposure. PET (positron emission tomography) scans are harder to interpret if medical staff cannot situate the location of cancer cells in relation to the skeleton and soft tissue. This is done by comparing PET images with an anatomical picture such as CT or MRI scans. Currently, due to the high expense of MRI, most hospitals combine PET and CT, but this combination has a significant weakness.

The team of physicists, at the University of Oslo (UiO; Oslo, Norway), developed a high resolution, high sensitivity technology based on an idea connected to the experiment at CERN (the European Organization for Nuclear Research) in which enormous detectors are used in the largest physics experiment being performed to trace the smallest particles. “We have managed to double the sensitivity. In practice, we can take the pictures twice as fast, or only use half of the radioactive dose in order to get the same image quality as previously,” said Erlend Bolle, PhD and particle physics researcher at UiO. Also, Dr. Bolle and his three colleagues have constructed the PET machine to be so small that it can be placed inside an MRI machine. Both images can thereby be taken simultaneously, further reducing total radiation exposure for patients and providing higher accuracy in that medical personnel do not have to correct for errors that occur when the two images are taken separately and later combined. Presently the technology is in a format specially optimized for use on experimental animals for research. However, Dr. Bolle emphasizes that “it can easily be rebuilt for hospital use.”

One of the great technical challenges that were overcome is that in order to trace the radioactive source, a PET scanner must find which parallel photons are linked. Current detectors have no depth information and therefore cannot reconstruct the positions of the many photons that release only part of their energy on first impact. In the new technology, identifying the locations of all photons is enabled by measuring the positions in three dimensions in a five-layer detector. The new detectors are made from entirely new crystals and light guides such that in each of the five layers of the detectors, crystal pins are placed on top of a transverse layer of light guide fibers. “This is a completely new way of measuring gamma particles,” notes Dr. Bolle. Another important technical improvement incorporated into the new PET scanner enables good image quality to be achieved even if the test animal is lying right next to the detectors.

Among advantages are parts of the new PET scanner that are put together like lego bricks; the system digitalizes the data at an earlier stage than the current PET solutions; the data can be sent to any number of computers; and image processing takes place in parallel with the examination.

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92 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (29.802322387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (83.92333984375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
105 (64.849853515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
106 (76.055526733398): 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=294742325 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (66.995620727539): 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=294742325 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (83.92333984375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
109 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
110 (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 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=294742325 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (615.83518981934): 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=294742325 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (769.85359191895): 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 (475.88348388672): 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=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
115 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
116 (108.95729064941): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
117 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
118 (54.836273193359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
119 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
120 (337.12387084961): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 19919.872283936): 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
122 (121.8318939209): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
123 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
124 (535.01129150391): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294742325 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294742325 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 633939.02778625): ( 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 (!!!!! 1106197.1187592): ( 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 (77.009201049805): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 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 = 294800513 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 = 294800359 LIMIT 1
130 (43.153762817383): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
131 (32.901763916016): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
132 (30.994415283203): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
133 (474.92980957031): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (418.90144348145): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (138.0443572998): SELECT name FROM jos_deeppockets WHERE id=213
136 (36.001205444336): SELECT name FROM jos_deeppockets WHERE id=213
137 (452.99530029297): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (426.05400085449): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (!!!!! 1063.8236999512): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
140 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
141 (!!!!! 8672.9526519775): TRUNCATE TABLE jos_trademed_module
142 (!!!!! 1205.9211730957): 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=294742325 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (540.01808166504): 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=294742325 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (397.92060852051): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
147 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
148 (!!!!! 1496.0765838623): 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
149 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
150 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
151 (529.05082702637): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294742325 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294742325 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (51.021575927734): 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)
153 (30.994415283203): 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)
154 (33.855438232422): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (212.19253540039): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
156 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742325 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742325 AND published='1' LIMIT 1
157 (44.107437133789): select jos_twitters.link from jos_twitters where cat=10
158 (28.848648071289): select jos_facebook.link from jos_facebook where cat=10
159 (29.087066650391): select jos_google_plus.link from jos_google_plus where cat=10
160 (30.040740966797): select jos_linkedin.link from jos_linkedin where cat=10
161 (299.93057250977): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 1893.9971923828): insert into jos_banners_delta values (14615,'2025-06-20 19:04:15','216.73.216.120','view'),(14202,'2025-06-20 19:04:15','216.73.216.120','view'),(14203,'2025-06-20 19:04:15','216.73.216.120','view')