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CT Radiation Exposure in Obese Patients Needs Further Evaluation

By MedImaging International staff writers
Posted on 25 Apr 2012
A group of US researchers has quantified the amount of radiation obese patients receive when undergoing routine medical scans. Their findings revealed that, when undergoing a computed tomography (CT) scan, a forced change of operation parameters for obese patients results in an increase of up to 62% in organ radiation exposure compared to lower weight patients.

Findings published April 5, 2012, in the journal Physics in Medicine & Biology. The researchers, from Rensselaer Polytechnic Institute (Rochester, NY, USA), hope this new study will help optimize CT scanning procedures to generate safe but effective medical images. Lead author of the study, Dr. Aiping Ding, said, “When a morbidly obese patient undergoes a CT scan, something known as the tube potential needs to be increased to make sure there are enough X-ray photons passing through the body to form a good image. So far, such optimization has been done by trial and error without the use of patient-specific quantitative analysis.”

When the researchers simulate the increase, the calculated doses of radiation reaching an obese patient’s organs increase by 62% in males and 59% in females. Their preliminary findings confirmed why the tube potential is frequently increased: a scan of the chest, abdomen, and pelvic area of obese patients, without adjusting the tube potential, revealed that organs deep within the abdomen received 59% less radiation compared to normal weight patients, due to the excess fat tissues.

Such a reduced dose could negatively affect the image quality unless the tube potential and tube current are adjusted accordingly. Results were obtained by creating 10 (5 male, 5 female) computerized phantoms with a body mass index (BMI) ranging from 23.5 kg/m2 (normal weight) to 46.4 kg/m2 (morbidly obese)--such a detailed model of obese patients has not been used before.

Phantoms are specifically designed physical or simulated objects that can be experimented with in the field of medical imaging for evaluating, analyzing, and refining the performance of various devices. This study used computer-simulated deformable phantoms that were put through a CT scanning computer model to calculate the dose of radiation exposed to each one.

The phantoms were unique in that they not only accounted for a large number of organs, but also modeled two types of fat: the subcutaneous adipose tissue (SAT) under the skin and the visceral adipose tissue (VAT) that lies deeper in the body and sits around the organs. This provided the researchers with a more precise determination about the amounts of radiation reaching different organs.

The prevalence of overweight and obese individuals has increased markedly over the past 20 years; a recent survey suggests that nearly 60% of the adult American population can be diagnosed as being clinically overweight or obese.

Given this disturbing trend and the health risks associated with obesity, it is no surprise that an increasing number of overweight or obese individuals are entering radiology clinics. “We hope that this very timely set of data will be integrated with previous work for normal size adult and child patients to form a comprehensive database to support a software package called VirtualDose that will enter clinical testing this summer. Such a tool could be used to analyze radiation exposure trends in a clinic and to study how to optimize the image quality for a large population of patients,” said Prof. X George Xu, the senior corresponding author of the study.

These new phantoms for overweight and obese patients will be part of a forthcoming software package, VirtualDose, developed by Prof. Xu and his team. VirtualDose’s objective is to enable the creation of a personalized, extremely realistic phantom of any patient undergoing a CT scan. The program takes into consideration a patient’s individual characteristics, including age, sex, height, weight, and even if a woman is pregnant. By entering these data into the software, VirtualDose quickly creates a phantom that accurately models the patient’s internal organs. These phantoms will allow physicians and researchers to compare the radiation doses a patient will get from different CT scanner settings, and then choose the most appropriate configuration.

VirtualDose will also enable physicians to keep a highly accurate record of how much radiation patients are exposed to over their lifetime. California recently became the first state in the United States to require radiation dose records for patients undergoing CT examinations.

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85 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (77.009201049805): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294740345 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (42.915344238281): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294740345 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (48.160552978516): 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 (407.93418884277): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (!!!!! 2177.9537200928): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (203.84788513184): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (62.942504882812): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (!!!!! 1768.1121826172): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (29.802322387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 4529.9530029297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
105 (180.00602722168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
106 (111.10305786133): 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=294740345 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (586.03286743164): 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=294740345 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (126.12342834473): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
109 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
110 (169.99244689941): 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=294740345 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (810.86158752441): 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=294740345 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (890.97023010254): 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 (926.01776123047): 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 (!!!!! 6103.9924621582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
115 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
116 (328.06396484375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
117 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
118 (310.89782714844): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
119 (47.206878662109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
120 (442.0280456543): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
121 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
122 (380.03921508789): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 57348.966598511): 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 (!!!!! 5003.9291381836): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294740345 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294740345 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 16333.103179932): ( 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 (73.19450378418): ( 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 (43.869018554688): 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 (31.948089599609): 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 (75.817108154297): 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 (32.901763916016): 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 (340.93856811523): 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 (36.954879760742): 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 (40.054321289062): 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 (36.001205444336): 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 (675.91667175293): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (567.91305541992): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (107.0499420166): SELECT name FROM jos_deeppockets WHERE id=211
138 (!!!!! 4072.904586792): SELECT name FROM jos_deeppockets WHERE id=211
139 (!!!!! 1050.9490966797): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (900.0301361084): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 3377.9144287109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
142 (173.09188842773): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
143 (!!!!! 18491.983413696): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 9267.0917510986): 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=294740345 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (942.94548034668): 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=294740345 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (831.84242248535): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (118.01719665527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (123.97766113281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
149 (89.168548583984): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
150 (!!!!! 5360.8417510986): 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 (90.122222900391): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
152 (!!!!! 2305.0308227539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
153 (492.81120300293): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294740345 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294740345 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 (30.994415283203): 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 (!!!!! 3876.9245147705): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (210.04676818848): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
158 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294740345 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294740345 AND published='1' LIMIT 1
159 (108.00361633301): select jos_twitters.link from jos_twitters where cat=10
160 (53.882598876953): select jos_facebook.link from jos_facebook where cat=10
161 (54.121017456055): select jos_google_plus.link from jos_google_plus where cat=10
162 (47.922134399414): select jos_linkedin.link from jos_linkedin where cat=10