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Cardiac PET/MR Provides Similar Results to PET/CT

By MedImaging International staff writers
Posted on 27 Jun 2013
Integrated positron emission tomography and magnetic resonance (PET/MR) imaging was employed only a few years ago in research institutes, but progressively the technology has expanded into clinical practice. This is particularly the case for cardiac indications, for which the highly sensitive soft tissue contrast of MR and the functional and metabolic imaging of PET are particularly valuable. New data validate the benefits of PET/MR compared to PET/computed tomography (CT) in cardiac applications.

The new findings were presented at the Society of Nuclear Medicine and Molecular Imaging’s (SNMMI) 2013, 60th annual meeting, held June 8-12, 2013, in Vancouver (BC, Canada). PET/MR imaging techniques have been refined over the past several years, particularly in terms of disease detection and the correction of blurring (attenuation). PET/CT systems use CT to compensate for attenuation, and PET/MR employs MR technology. Part of this study compared the two to see how they correlate. “Our research demonstrated that cardiac PET assessment for heart muscle viability using PET/MR yielded comparable results to PET acquired using PET/CT,” said principal author Jeffrey M.C. Lau, MD, PhD, from Washington University (St. Louis, MO, USA). “It showed that MR can be used for PET attenuation correction in the same way that CT can.”

This technology creates opportunities for the technology in a range of cardiac applications. In this instance, researchers used F-18 fluorodeoxyglucose (F-18 FDG), which emulates glucose as a source of fuel for heart and other cells that metabolize the agent readily. F-18 FDG-PET scans inform cardiologists about the metabolic activity of cardiac tissues and general heart muscle function. This study focused on visualization of FDG in cardiac cells by PET/MR compared to PET/CT, which was found to be very similar. Comparable attenuation correction and imaging agent uptake measurements move PET/MR forward toward important clinical applications, including the use of PET/MR for imaging scarring of heart tissue and subsequent complications after cardiac arrest, with some major benefits for patients.

“Our research provides the groundwork for future research in cardiac PET/MR imaging,” said Dr. Lau. “PET/MR provides powerful cardiac imaging and requires a lower radiation dose than PET/CT. Also, the MRI component, which can be acquired simultaneously, provides excellent heart muscle signal for imaging scar tissue caused by heart attacks. In particular, our group is most interested in applying the PET/MR technology to evaluate the likelihood of arrhythmia or irregular heart beat development in patients who have had heart attacks.”

The study included 31 patients with no history of heart problems being screened for cancer. All participants underwent both PET/CT and PET/MR with F-18 FDG injection administered approximately one hour before PET/CT and two hours before PET/MR. Attenuation correction with MR was made possible by a specialized dual-echo MR sequence that instructs radiofrequency magnetic fields interacting with atomic nuclei in the body to “see” differentiation between water and fat. The uptake of FDG in the myocardium was measured by looking at a cross-section of the left ventricle of the heart that empties oxygen-rich blood into the aorta. The average measurement of FDG uptake in the left ventricle was nearly identical, 4.68 for PET/MR and 4.62 for PET/CT. This research also has implications for future studies into ischemic cardiomyopathy, which is a weakening of the left ventricle that can lead to reduced blood flow from the heart and possibly life-threatening cardiac episodes.

Studies have shown that implanted cardiac defibrillators (ICDs) are related to the development of ventricular arrhythmias in up to a third of implanted patients within three years. Researchers hope to learn more about this relationship with future PET/MR studies.

“Our hope is that in the future PET/MR will become the imaging modality of choice for certain cardiac diseases,” concluded Dr. Lau. “One potential use of cardiac PET/MR is to guide the patient selection process when deciding if patients who have suffered ischemic cardiomyopathy are good candidates for cardiac defibrillator implantation. We hope that a better understanding of the metabolic and anatomic correlation of PET/MR in the myocardial scar and scar border can provide more insight into arrhythmias that lead to sudden cardiac death.”

Additional research is required to continue providing information about the benefits and appropriateness of PET/MR in clinical practice. This study was conducted in conjunction with Siemens Healthcare (Erlangen, Germany).

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88 (34.093856811523): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294746991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (51.975250244141): 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 (37.193298339844): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (29.802322387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (74.863433837891): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
105 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
106 (54.121017456055): 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=294746991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (50.067901611328): 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=294746991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (85.830688476562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
109 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
110 (51.021575927734): 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=294746991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (539.06440734863): 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=294746991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (558.13789367676): 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 (353.09791564941): 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 (84.161758422852): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
115 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
116 (83.92333984375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
117 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
118 (92.983245849609): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
119 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
120 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
121 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
122 (399.82795715332): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294746991 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294746991 AND type='deeppockets_item' AND published='1' LIMIT 1
123 (!!!!! 476364.13574219): ( 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
124 (106.0962677002): ( 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
125 (48.160552978516): 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
126 (30.994415283203): 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
127 (47.922134399414): 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
128 (30.040740966797): 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
129 (27.894973754883): 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
130 (36.954879760742): 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
131 (560.04524230957): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
132 (528.81240844727): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
133 (298.02322387695): SELECT name FROM jos_deeppockets WHERE id=213
134 (38.862228393555): SELECT name FROM jos_deeppockets WHERE id=213
135 (545.02487182617): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
136 (473.0224609375): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
137 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
138 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
139 (378.13186645508): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
140 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
141 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
142 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
143 (!!!!! 1066.2078857422): 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
144 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
145 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
146 (49.114227294922): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294746991 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294746991 AND type='deeppockets_item' AND published='1' LIMIT 1
147 (40.054321289062): 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)
148 (34.093856811523): 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)
149 (44.107437133789): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
150 (195.98007202148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
151 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294746991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294746991 AND published='1' LIMIT 1
152 (34.093856811523): select jos_twitters.link from jos_twitters where cat=10
153 (29.087066650391): select jos_facebook.link from jos_facebook where cat=10
154 (29.087066650391): select jos_google_plus.link from jos_google_plus where cat=10
155 (28.133392333984): select jos_linkedin.link from jos_linkedin where cat=10
156 (313.04359436035): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
157 (!!!!! 1385.9272003174): insert into jos_banners_delta values (14615,'2025-06-20 05:44:41','216.73.216.120','view'),(14202,'2025-06-20 05:44:41','216.73.216.120','view'),(14203,'2025-06-20 05:44:41','216.73.216.120','view')