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New Radiation Reduction Standards Proposed for Worldwide Implementation

By MedImaging International staff writers
Posted on 15 Nov 2012
A Canadian heart institute is putting into play what could become a transformation in medical imaging in Canada as it presented findings in radiation reduction for the diagnosis of cardiovascular disease. More...


As a result of an initiative that combines optimizing test protocols, state-of-the art equipment, and high-tech software, two-thirds of the Ottawa Heart Institutes (UOHI; Ottawa, Ontario, Canada) nuclear cardiology patients are currently receiving half the radiation dosage that they would normally get. Radiation reduction techniques have been accomplished across all kinds of radiation-based cardiac imaging--computed tomography (CT), nuclear imaging, and positron emission tomography (PET). The Heart Institute is one of only a one of a couple of centers in Canada with the in-house expertise to assess and clinically apply these latest developments across these technologies.

The American Society for Nuclear Cardiology has challenged the nuclear cardiology community to reduce radiation exposure below 9 millisieverts (mSv) by 2014. The techniques being employed at the Heart Institute regularly reduce exposure to 5 mSv, and frequently much less, putting UOHI well ahead of the game. This figure has not bottomed out, as efforts will continue to minimize radiation wherever possible.

“Our clinicians are taking a much more critical look at who they are testing with radioactive methods and making decisions based upon risk and necessity which will only expose patients to radiation who truly need the test,” said Dr. Benjamin Chow, codirector of cardiac radiology at the University of Ottawa Heart Institute. These responsible practices, along with a judicious use of technology, could revolutionize cardiac imaging in Canada.”

The payback for this effort include reduced radiation dosages for patients, greater flexibility for customizing modalities for patients, and, in some instances, a decreased need placed on radioisotopes. For example, for younger patients, radiation exposure presents greater risks because they have more years in which cancer could develop. So lessening their dosage is a high priority. In the case of older patients whose lives may be threatened by an immediate cardiac problem condition, the advantages would overshadow the small risk of developing cancer later in life.

UOHI also uses a combination of effective applications that facilitate a better diagnosis of cardiovascular problems. The cadmium-zinc-telluride camera system used for nuclear imaging is a significant development and it was implemented by Dr. Glenn Wells, medical physicist in nuclear cardiology. The Heart Institute was one of the first centers in the world with this technology in 2009, and it had a major impact on reducing radiation in perfusion single emission computed tomography (SPECT) scans, the most typical cardiac imaging modality.

The introduction of PET imaging in the late 1990s, which provides much more detailed imagery with much lower levels of injected isotopes, has also had an impact on reducing radiation exposure. The use of these cameras in Canada is still uncommon but increasing.

Software is another critical part of imaging, transforming the scanner data into coherent two- or even three-dimensional (3D) images of what is seen in a patient’s body. The Heart Institute has helped commercial developers evaluate and enhance new, sophisticated software packages for both PET and SPECT scanners that maintain image quality while using less radioactive isotopes.

Radiation has become a concern for both medical professionals and patients; however, frequently people do not realize the considerable advantages of very effective diagnostic imaging modalities that may require very low amounts of medical radiation. “Careful and appropriate selection of the right test for the right patient balancing benefit and risk enables optimal patient care,” said Dr. Terrence Ruddy, director of nuclear cardiology, University of Ottawa Heart Institute.

Related Links:
Ottawa Heart Institutes



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87 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
88 (71.048736572266): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294743438 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (59.127807617188): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294743438 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (42.915344238281): 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`
91 (88.214874267578): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (42.915344238281): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (43.153762817383): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (37.193298339844): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (43.153762817383): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (118.97087097168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
106 (69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
107 (72.002410888672): 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=294743438 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (101.80473327637): 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=294743438 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (108.95729064941): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
110 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
111 (78.916549682617): 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=294743438 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (755.07164001465): 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=294743438 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (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
114 (723.12355041504): 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 (144.95849609375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
116 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
117 (86.069107055664): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
118 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
119 (169.03877258301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
120 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
121 (79.154968261719): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
122 (63.180923461914): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
123 (527.14347839355): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
124 (!!!!! 59714.078903198): 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
125 (730.03768920898): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294743438 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294743438 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 10994.19593811): ( 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 (154.01840209961): ( 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 (74.863433837891): 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 (41.961669921875): 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 (81.062316894531): 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 (41.007995605469): 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 (437.02125549316): 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 (60.081481933594): 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 (61.03515625): 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 (43.869018554688): 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 (652.79006958008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (531.19659423828): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (62.942504882812): SELECT name FROM jos_deeppockets WHERE id=211
139 (40.054321289062): SELECT name FROM jos_deeppockets WHERE id=211
140 (861.16790771484): 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 '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (726.93824768066): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (109.19570922852): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
143 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
144 (!!!!! 11466.979980469): TRUNCATE TABLE jos_trademed_module
145 (139.95170593262): 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=294743438 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (92.029571533203): 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=294743438 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (!!!!! 1033.0677032471): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (91.075897216797): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (118.01719665527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
150 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
151 (!!!!! 1751.8997192383): 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
152 (80.108642578125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
153 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
154 (38.862228393555): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294743438 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294743438 AND type='deeppockets_item' AND published='1' LIMIT 1
155 (36.001205444336): 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=211 or channel_id is null)
156 (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=211 or channel_id is null)
157 (36.001205444336): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
158 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
159 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743438 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743438 AND published='1' LIMIT 1
160 (53.882598876953): select jos_twitters.link from jos_twitters where cat=10
161 (37.908554077148): select jos_facebook.link from jos_facebook where cat=10
162 (39.100646972656): select jos_google_plus.link from jos_google_plus where cat=10
163 (37.908554077148): select jos_linkedin.link from jos_linkedin where cat=10