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New Heart Scan May Speed up Diagnosis with Less Radiation

By MedImaging International staff writers
Posted on 06 Sep 2011
New imaging technology appears to provide faster, more accurate heart scans for both viewing blood vessels in the heart and measuring blood supply to the heart muscle, while exposing patients to less radiation.

Researchers reported their findings online August 23, 2011, in the journal Circulation: Cardiovascular Imaging, a journal of the American Heart Association. In preliminary tests from a small trial of 39 patients, computerized tomography (CT) scans called second-generation, 128-slice, dual-source Flash CT captured faster images of the entire heart allowing clinicians to better visualize artery blockages and reduced blood flow through the heart. This was accomplished using one-tenth of the radiation of current CT scans, the standard test for diagnosing and pinpointing the location of heart disease.

The CT scan uses a high-pitch Flash CT scan technique, which enables an ultrafast scan time. A contrast agent and vasodilatator is injected into the patient’s blood vessels to help highlight certain areas. “The new exam is faster and more convenient for the patient,” said Gudrun M. Feuchtner, MD, a professor in the department of radiology at the Innsbruck Medical University (Austria), and a study coauthor.

The new technology captures images of the entire heart in less than 0.3 seconds--within one heartbeat--as compared to 6 seconds and several heartbeats for traditional CT scans. For accuracy, the new scan was compared to cardiac magnetic resonance imaging (MRI), and invasive angiogram, which involves sliding a catheter through an artery in the groin or arm to the heart. An angiogram, and sometimes MRI, requires contrast dye.

Compared to cardiac MRI, 78% to 95% of the time the new CT accurately identified restricted blood flow and correctly ruled it out 84% to 94% of the time. Compared to invasive angiography, the new CT scanner had 90% accuracy in detecting significant blockages. The new CT scanner’s accuracy improved to 95% when added to CT perfusion--a scan taken after using contrast dye.

The scan proved especially useful in patients with advanced heart disease or diabetic patients who reported no symptoms, but were found to have areas of poor coronary blood flow, according to Dr. Feuchtner. Because diabetics may have nerve damage, they may not always experience the chest pains that typically accompany reduced blood flow to the heart. “Those patients would not immediately seek a cardiologist, but would have a poor prognosis,” he stated.

The study findings can also help to plan heart surgery more accurately, according to Dr. Andre Plass, a coauthor and cardiac surgeon from University Hospital Zurich (Switzerland).

Moreover, the new technology answers two questions with one scan: whether the blood vessels of the heart are narrowed and whether there is reduced blood flow. “This can have important implications for cost savings and efficiency as two studies are done in one setting,” said Ricardo C. Cury, MD, coauthor of the study and chairman of radiology at Baptist Health of South Florida (Miami, USA).

Larger studies are needed, however, according to the investigators, before the new technology is widely used.

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87 (!!!!! 3190.9942626953): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294736936 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (221.96769714355): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294736936 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (!!!!! 2233.9820861816): 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 (61.988830566406): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (117.06352233887): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
105 (236.98806762695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
106 (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 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=294736936 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (!!!!! 4266.0236358643): 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=294736936 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (844.95544433594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
109 (534.0576171875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
110 (287.05596923828): 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=294736936 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (425.81558227539): 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=294736936 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (720.97778320312): 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 (!!!!! 3592.0143127441): 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 (!!!!! 5980.9684753418): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
115 (852.10800170898): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
116 (178.09867858887): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
117 (!!!!! 11297.941207886): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
118 (!!!!! 7741.9281005859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
119 (!!!!! 7994.1749572754): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
120 (!!!!! 2568.9601898193): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
121 (310.89782714844): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
122 (858.06846618652): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 71549.892425537): 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 (617.98095703125): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294736936 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294736936 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (62.942504882812): ( 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 (45.061111450195): ( 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 (83.92333984375): 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 (47.922134399414): 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 (49.114227294922): 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 (36.001205444336): 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 (35.04753112793): 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 (31.948089599609): 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 (34.093856811523): 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 (30.994415283203): 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 (394.10591125488): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (262.02201843262): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (118.01719665527): SELECT name FROM jos_deeppockets WHERE id=211
138 (34.093856811523): SELECT name FROM jos_deeppockets WHERE id=211
139 (762.939453125): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 1114.1300201416): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (133.99124145508): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
142 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
143 (!!!!! 7452.9647827148): TRUNCATE TABLE jos_trademed_module
144 (185.96649169922): 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=294736936 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (!!!!! 5705.8334350586): 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=294736936 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (381.9465637207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (148.05793762207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (102.99682617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
149 (258.9225769043): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
150 (!!!!! 1541.1376953125): 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 (465.86990356445): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
152 (270.84350585938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
153 (591.03965759277): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294736936 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294736936 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (438.92860412598): 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)
155 (692.84439086914): 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 (651.12113952637): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (243.9022064209): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
158 (!!!!! 2384.9010467529): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294736936 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294736936 AND published='1' LIMIT 1
159 (!!!!! 1005.8879852295): select jos_twitters.link from jos_twitters where cat=10
160 (276.08871459961): select jos_facebook.link from jos_facebook where cat=10
161 (47.922134399414): select jos_google_plus.link from jos_google_plus where cat=10
162 (36.954879760742): select jos_linkedin.link from jos_linkedin where cat=10