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Less Is More in Cancer Imaging - New Technique Helps Scanners Pinpoint Tumors

By MedImaging International staff writers
Posted on 11 Mar 2010
When one diagnoses a cancer patient, it is important to collect as much information about that person as possible. Now an accurate diagnosis could depend on throwing some of that data away, which is key to the technique employed by researchers as they enhance the efficiency of scanners that find and track lung and thoracic tumors.

In a study published January 2010 in the Journal of Nuclear Medicine (JNM), a team from Rice University (Houston, TX, USA) and the University of Texas M.D. Anderson Cancer Center (Houston, USA) and led by fifth-year Rice graduate student Guoping Chang, described an amplitude gating technique that gives physicians a clearer picture of how tumors are responding to treatment.

Mr. Chang's technique works in conjunction with positron emission tomography/computed tomography (PET/CT) scanners, commonly used devices that combine two technologies into a single unit.

CT scanners capture a three-dimensional (3D) image of the inside of the body. PET scanners search for a radioactive signature. Before a PET scan, a patient is injected with slightly radioactive molecules tagged to track and adhere to specific cancer cells. As the molecules gather at those cells and decay, they give off a signal that the PET scanner can read. Together, the scanners give clinicians a good idea of a tumor's location and whether it is malignant or benign. Subsequent scans can show how it is responding to treatment.

However, there is a problem. Whereas CT scans take relatively fast snapshots, PET scanners need as long as three minutes to capture an image from a single section of the body. Because patients have to breathe, the images do not always correlate well. "Patients might have lesions located in organs that move due to respiratory motion,” said Mr. Chang's technical adviser, Dr. Osama Mawlawi, an associate professor in the department of imaging physics at M.D. Anderson and an adjunct lecturer in electrical and computer engineering at Rice. "When patients breathe, these lesions will be blurred.”

Since physicians cannot ask patients to stop breathing for three minutes, Mr. Chang found a way to turn a patient's respiratory motion--the amplitude--into a waveform that serves as a kind of time code. In the new technique, patients are fitted with a flexible band around the chest that records their breathing cycles during the CT scan--the 3D X-ray taken as the patient slides through the ring-shaped device.

During the subsequent, much longer PET scan, the program creates a "gate,” which allows data for specific points in the breathing cycle to pass through and throws away the rest. The program automatically correlates that data to the CT images. A patient may take 40 breaths during those three minutes. Combining 40 images from a specific point in the breathing cycle--such as mid-breath--makes for a much sharper image because the tumor will be in pretty much the same spot.

Even better, according to Dr. Mawlawi, the radiologic signal captured by the gated PET scan is more coherent. "One of the important aspects of PET imaging is that it can tell us how malignant a lesion is,” he said. "The scan gives us a specific number which is correlated with the measured signal intensity; the more accurate this number is, the better the physician's assessment is of a lesion's malignancy and response to treatment. When someone undergoing therapy is scanned again, the change in signal intensity--not just the size of the lesion--tells us whether the patient is responding or not. This is equally important to the quality of the image.”

In tests on 13 volunteer patients at M.D. Anderson, information collected using the technique on 21 tumors was significantly better with this gated technique than without. Patients were not required to modify their breathing in any way, Mr. Chang reported; this enabled them to be as comfortable as possible during the scan.

"It can save people's lives,' Mr. Chang concluded, "that's what I want.”

The research was supported in part by a grant from GE Healthcare (Chalfont St. Giles, UK).

Mr. Chang won a Young Investigator Award for his presentation on the topic during the 56th annual Society of Nuclear Medicine meeting in Toronto, Canada, in June 2009.

Related Links:

Rice University
University of Texas M.D. Anderson Cancer Center



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89 (36.954879760742): 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 (!!!!! 2813.8160705566): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (288.00964355469): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (149.96528625488): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (205.99365234375): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (!!!!! 2515.0775909424): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (360.96572875977): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 3176.212310791): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
105 (110.86463928223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
106 (!!!!! 2527.9521942139): 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=294728411 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (!!!!! 1173.0194091797): 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=294728411 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 2274.9900817871): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
109 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
110 (726.93824768066): 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=294728411 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (513.07678222656): 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=294728411 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 1625.7762908936): 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 (!!!!! 1232.8624725342): 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 (!!!!! 1319.8852539062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
115 (371.93298339844): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
116 (935.79292297363): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
117 (656.8431854248): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
118 (!!!!! 1935.0051879883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
119 (561.95259094238): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
120 (662.08839416504): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
121 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
122 (401.97372436523): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 53184.986114502): 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 (!!!!! 1095.0565338135): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294728411 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294728411 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 24631.023406982): ( 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 (54.836273193359): ( 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 (237.94174194336): 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 (51.975250244141): 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 (!!!!! 1289.8445129395): 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 (657.79685974121): 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 (342.13066101074): 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 (465.15464782715): 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 (947.95227050781): 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 (71.048736572266): 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 (!!!!! 7988.9297485352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 4508.9721679688): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (!!!!! 7322.0729827881): SELECT name FROM jos_deeppockets WHERE id=213
138 (!!!!! 7879.0187835693): SELECT name FROM jos_deeppockets WHERE id=213
139 (!!!!! 7661.1042022705): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 8134.126663208): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 11543.989181519): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
142 (!!!!! 3971.8151092529): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
143 (!!!!! 18631.935119629): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 5283.1172943115): 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=294728411 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (977.0393371582): 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=294728411 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (367.87986755371): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (!!!!! 1230.001449585): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (688.07601928711): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
149 (352.14424133301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
150 (!!!!! 3041.0289764404): 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 (!!!!! 3977.7755737305): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
152 (!!!!! 7819.1757202148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
153 (!!!!! 3752.9468536377): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294728411 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294728411 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (487.08915710449): 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 (318.05038452148): 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 (519.99092102051): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (222.92137145996): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
158 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294728411 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294728411 AND published='1' LIMIT 1
159 (158.07151794434): select jos_twitters.link from jos_twitters where cat=10
160 (102.04315185547): select jos_facebook.link from jos_facebook where cat=10
161 (389.81437683105): select jos_google_plus.link from jos_google_plus where cat=10
162 (118.01719665527): select jos_linkedin.link from jos_linkedin where cat=10