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4D PET/CT Could Produce Inaccurate Tumor Imaging Unless Patient's Respiratory Pattern Highly Stable

By MedImaging International staff writers
Posted on 21 Jun 2011
A study focused on the effect that breathing irregularities have on the accuracy of four-dimensional (4D) positron emission tomography (PET) scans and outlined a PET imaging technique that reduces motion artifacts or image blurring arising from respiratory motion. Nongated PET imaging with 4D computed tomography (CT) may be useful for imaging patients who do not benefit from the use of respiratory gating, most notably patients with erratic breathing.

"Breathing irregularities can lead to significantly underestimated lesion activity in respiratory-gated PET imaging," said Boon-Keng Teo, PhD, assistant professor of radiation oncology at the University of Pennsylvania (Philadelphia, PA, USA), who presented the findings at SNM's 58th annual meeting, held June 4-8, 2011, in San Antonio, TX, USA. "Nongated PET imaging corrected with 4D CT may be more effective for imaging patients with irregular breathing. This could potentially lead to a more robust and quantitatively accurate reading of active tumors."

Respiratory gating technologies have greatly improved the diagnostic quality of PET imaging, which provides functional images of physiologic processes occurring in the body. Sensors in respiratory gating systems positioned on or around the patient monitor the phase of the breathing cycle. They then transmit data about the patient's breathing to the scanning technology for image processing. Instead of creating one fluid image that shows motion artifacts, respiratory-gated PET imaging is similar to a series of photos taken during different phases of the respiratory cycle that are grouped together to create a series of images corresponding to each phase. The difficulty is that patients with respiratory disease, heart conditions, or other serious disease are likely to be breathing unevenly. Respiratory gating systems are designed to work with normal breathing patterns, but not with irregular respiratory cycles.

Researchers conducted phantom studies to compare respiratory-gated PET imaging with nongated PET imaging corrected with 4D CT. The imaging modality utilizes X-ray technology and complex data processing to produce very high-resolution images of structural anatomy. Phantom studies were performed with inanimate objects and specialized motion devices that move in a controlled manner in order to simulate tumors in respiratory motion. The 4D PET and CT studies were conducted in succession with a hybrid PET/CT system. Various degrees of motion irregularities were simulated to study their impact on the accuracy of 4D PET for suppressing motion artifacts.

The study's findings revealed that nongated PET with 4D CT imaging could be an alternative to respiratory-gated PET imaging for determining tumor activity in patients with highly irregular breathing. These findings could change imaging protocols for patients with uneven breathing and possibly improve overall accuracy of tumor detection, thereby informing clinicians about appropriate treatments and perhaps even surgical planning for better cancer management.

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100 (138.0443572998): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (88.930130004883): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (147.81951904297): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (94.175338745117): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 3963.9472961426): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
105 (!!!!! 1398.0865478516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
106 (!!!!! 2486.9441986084): 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=294735665 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (!!!!! 1194.0002441406): 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=294735665 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 4503.0117034912): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
109 (226.97448730469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
110 (241.99485778809): 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=294735665 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 1029.0145874023): 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=294735665 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 7694.9596405029): 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 (!!!!! 6970.8824157715): 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 (!!!!! 5085.9451293945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
115 (!!!!! 3485.9180450439): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
116 (569.10514831543): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
117 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
118 (208.13941955566): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
119 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
120 (301.83792114258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
121 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
122 (467.77725219727): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 85134.983062744): 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 (!!!!! 6299.0188598633): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294735665 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294735665 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 42823.076248169): ( 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 (!!!!! 4339.9333953857): ( 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 (!!!!! 2722.0249176025): 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 (553.84635925293): 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 (!!!!! 2162.9333496094): 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 (338.07754516602): 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 (283.95652770996): 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 (41.007995605469): 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 (366.9261932373): 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 (108.95729064941): 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 (!!!!! 3876.9245147705): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 7123.9471435547): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (623.94142150879): SELECT name FROM jos_deeppockets WHERE id=213
138 (39.100646972656): SELECT name FROM jos_deeppockets WHERE id=213
139 (583.88710021973): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (721.93145751953): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (254.86946105957): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
142 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
143 (!!!!! 14321.088790894): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 2421.8559265137): 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=294735665 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (230.07392883301): 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=294735665 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 2423.7632751465): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (92.983245849609): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (427.0076751709): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
149 (53.167343139648): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
150 (!!!!! 1707.0770263672): 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 (682.11555480957): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
152 (242.94853210449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
153 (928.16352844238): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294735665 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294735665 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (46.968460083008): 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 (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=213 or channel_id is null)
156 (396.9669342041): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 1868.0095672607): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
158 (69.856643676758): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735665 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735665 AND published='1' LIMIT 1
159 (998.02017211914): select jos_twitters.link from jos_twitters where cat=10
160 (147.10426330566): select jos_facebook.link from jos_facebook where cat=10
161 (39.100646972656): select jos_google_plus.link from jos_google_plus where cat=10
162 (291.10908508301): select jos_linkedin.link from jos_linkedin where cat=10