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PET and CT Colonography Combines to Bring Comfort to Patients

By MedImaging International staff writers
Posted on 01 Jul 2010
A new method that combines two imaging technologies detects polyps, but requires no sedatives or bowel preparation.

A study published in the June 2010 issue of the Journal of Nuclear Medicine (JNM) shows that positron emission tomography (PET)--a molecular imaging technique--combined with computer tomography (CT) colonography may provide a suitable alternative for detecting polyps and cancer in the colon. This particular imaging method may be especially desirable for patients because it does not require sedation or bowel preparation.

"One of the first indications of colorectal cancer is often the presence of polyps, which are abnormal tissue growths on the inner lining of the colon or large intestine,” said Stuart A. Taylor, M.D., University College London (UK), and lead researcher of the study. "If these polyps are detected noninvasively and without the use of bowel preparation and sedatives, investigation can be much easier on patients who would otherwise undergo colonoscopies.”

Up to now, the conventional diagnostic modality for colorectal cancer and polyps has been colonoscopy, whereby a telescopic camera is introduced into the colon via the back passage and passed around the one to two meters of colon to look for abnormalities in the bowel lining. Although this technique is very effective, it is also invasive and can be uncomfortable for patients. Currently, patients empty their bowels using laxatives, may require sedation during the test and may need to take a day off from their normal activities. Strong laxatives can also be harmful to older patients by causing dehydration and disturbing their salt levels.

CT colonography (CTC) is an imaging technique that presents a promising, less invasive alternative to colonoscopy. The CTC scan provides images of the lining of the bowel, which has been gently distended with gas, without the need for sedatives. One potential advantage of CTC over colonoscopy is its ability to visualize the large bowel--without the patient having to take strong laxatives. PET scanning produces images of the uptake of blood sugar (glucose) by body tissues. Because cancerous cells tend to take up more blood sugar than normal tissue, these concentrations provide clear evidence of any abnormalities.

This study researched the effectiveness of using a combination of CTC and PET scans without any bowel preparation to detect significant abnormalities in the colon. Although other work has demonstrated that combined PET CTC is technically feasible, most have required patients to undergo complete bowel preparation and only a small number of patients have been studied. The current study is the largest to date investigating combined PET CTC in patients without any bowel preparation.

Fifty-six patients agreed to undergo a one-hour CTC and PET scan approximately two weeks before their scheduled colonoscopy. This was done without the use of laxatives. Patients were also asked to complete a questionnaire to see how they tolerated the tests and which ones they preferred.

The colonoscopy findings were then compared with the CTC scan on its own and with the CTC and PET scans combined. The study revealed that the combined PET CTC scans detected all the significant larger polyps found by the invasive colonoscopy technique. Moreover, most patients found the combined scan technique more comfortable and preferred it to colonoscopy.

"The work has shown that combined PET CTC is technically feasible, well tolerated by patients, and capable of achieving high diagnostic accuracy,” noted Dr. Taylor. "This test would be mainly used in patients less able to tolerate invasive investigations or the preparation required if physicians want to exclude any major pathology in the colon and abdomen.”

Colorectal cancer is one of the leading causes of cancer death in the Western world and affects approximately 6% of the population.

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87 (110.86463928223): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294730051 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (48.87580871582): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294730051 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (46.014785766602): 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 (96.08268737793): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (44.822692871094): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (!!!!! 1806.0207366943): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (!!!!! 3909.1110229492): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (127.07710266113): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (!!!!! 3782.9875946045): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (128.98445129395): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (126.12342834473): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (52.213668823242): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 2667.1886444092): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
105 (!!!!! 3954.8873901367): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
106 (107.0499420166): 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=294730051 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (795.12596130371): 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=294730051 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (219.10667419434): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
109 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
110 (890.97023010254): 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=294730051 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 1641.0350799561): 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=294730051 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 2288.1031036377): 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 (945.8065032959): 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 (!!!!! 7308.0062866211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
115 (!!!!! 4750.9670257568): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
116 (!!!!! 2331.018447876): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
117 (754.11796569824): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
118 (!!!!! 1305.8185577393): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
119 (95.129013061523): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
120 (!!!!! 2027.9884338379): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
121 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
122 (427.0076751709): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 77217.102050781): 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 (!!!!! 1219.0341949463): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294730051 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294730051 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (73.909759521484): ( 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 (50.783157348633): ( 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 (244.8558807373): 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 (51.021575927734): 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 (400.06637573242): 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 (216.00723266602): 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 (47.922134399414): 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 (42.915344238281): 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 (216.00723266602): 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 (144.00482177734): 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 (!!!!! 5105.0186157227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 1332.0446014404): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (!!!!! 5959.9876403809): SELECT name FROM jos_deeppockets WHERE id=211
138 (!!!!! 7282.018661499): SELECT name FROM jos_deeppockets WHERE id=211
139 (!!!!! 5961.8949890137): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 4750.0133514404): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (575.06561279297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
142 (401.02005004883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
143 (!!!!! 17825.126647949): TRUNCATE TABLE jos_trademed_module
144 (732.8987121582): 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=294730051 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (106.0962677002): 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=294730051 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 1219.0341949463): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (91.075897216797): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (100.13580322266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
149 (!!!!! 3417.0150756836): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
150 (!!!!! 10126.113891602): 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 (!!!!! 8244.0376281738): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
152 (165.22407531738): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
153 (88.930130004883): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294730051 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294730051 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (48.87580871582): 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 (44.107437133789): 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 (49.829483032227): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (119.92454528809): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
158 (87.02278137207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730051 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730051 AND published='1' LIMIT 1
159 (756.02531433105): select jos_twitters.link from jos_twitters where cat=10
160 (977.99301147461): select jos_facebook.link from jos_facebook where cat=10
161 (59.127807617188): select jos_google_plus.link from jos_google_plus where cat=10
162 (40.054321289062): select jos_linkedin.link from jos_linkedin where cat=10