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Scatter Radiation from Mammography Appears to Present No Cancer Risk

By MedImaging International staff writers
Posted on 04 Dec 2012
The radiation dose to the body regions nearby the breast during mammography is negligible, or very low, and consequently, does not result in an increased risk of cancer, according to new research.

The a study’s findings were presented at the annual meeting of the Radiological Society of North America (RSNA), held November 25-30, 2012, in Chicago (IL, USA). The findings suggest that the use of thyroid shields during mammography is unnecessary. “Thyroid shields can impede good mammographic quality and, therefore, are not recommended during mammography,” said Alison L. Chetlen, DO, assistant professor of radiology at Pennsylvania State Hershey Medical Center (USA).

Some X-rays scatter away from the primary beam during mammography screening in the breast and spread outward in different directions. Although this scatter radiation is much weaker than the primary beam, there has been concern that women exposed to it during mammography could face an increased risk of cancer, particularly in radiosensitive regions such as the thyroid gland.

To better understand the potential impact of scatter radiation, Dr. Chetlen and colleagues set out to measure the dose received by the thyroid gland, salivary gland, sternum, uterus, and the lens of the eye during screening digital mammography. Each of the 207 women in the study group wore six optically stimulated luminescent dosimeters--a device used to measure an absorbed dose of ionizing radiation--while undergoing two-view screening mammography.

Dosimeter analysis by a medical physicist immediately after the exam revealed that the doses to the various areas outside of the breast ranged from negligible to very low. The average estimated organ dose to the salivary gland was 0.05 mGy. The average estimated organ dose to the thyroid gland was 0.05 mGy. These doses are only a fraction of the radiation people are exposed to from natural background sources, such as cosmic radiation and radionuclides in the ground. Significantly, all areas except for the sternum received less than 2% of yearly background radiation dose.

Measured dose to the umbilicus and bridge of the eye was negligible, indicating no increased risk to the patient of cataracts or interference with normal embryonic development in early pregnancy. “The risk of cancer induction at these low levels is indistinguishable from background incidence of cancer due to other sources,” Dr. Chetlen said.

The findings are particularly important in light of a recent increase in the incidence of thyroid cancer, one of the most radiosensitive of all cancers. The number of thyroid cancer diagnoses in women nearly doubled from 2000 to 2008, leading some to question that mammography screening may be a contributing factor and that women should wear lead thyroid shields during exams, a notion that Dr. Chetlen and other mammography specialists have greatly discourage.

Based on the extremely low scatter radiation dose to the thyroid--the same as just a few minutes of background radiation--thyroid shields are unnecessary during mammography. Furthermore, the researchers warn that use of thyroid shields could result in an increased radiation dose to patients. “A thyroid shield gets in the way of the exam and can actually cause an increase in radiation dose by necessitating repeat exams,” Dr. Chetlen said.

Dr. Chetlen also pointed out that the thyroid gland is far less radiosensitive after age 30. The American Cancer Society and other organizations recommend that women have mammography screening once every year, beginning at age 40. “In the age group eligible for screening, the thyroid gland is not very radiosensitive,” Dr. Chetlen said.

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87 (!!!!! 4250.0495910645): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294743664 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (57.93571472168): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294743664 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (61.03515625): 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 (64.13459777832): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (!!!!! 17199.993133545): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (109.19570922852): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 10689.973831177): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
105 (130.89179992676): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
106 (65.088272094727): 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=294743664 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (620.84197998047): 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=294743664 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 5423.0690002441): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
109 (138.0443572998): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
110 (53.167343139648): 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=294743664 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (600.09956359863): 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=294743664 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (965.11840820312): 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 (499.01008605957): 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 (85.830688476562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
115 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
116 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
117 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
118 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
119 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
120 (463.96255493164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
121 (!!!!! 4047.8706359863): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
122 (241.04118347168): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 59121.84715271): 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 (!!!!! 7683.9923858643): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294743664 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294743664 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 16020.059585571): ( 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 (!!!!! 9052.038192749): ( 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 (!!!!! 1577.8541564941): 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 (82.969665527344): 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 (797.03330993652): 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 (50.067901611328): 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 (!!!!! 7981.0619354248): 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 (142.09747314453): 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 (51.021575927734): 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 (31.948089599609): 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 (!!!!! 1237.154006958): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (658.03527832031): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (!!!!! 1265.0489807129): SELECT name FROM jos_deeppockets WHERE id=211
138 (36.954879760742): SELECT name FROM jos_deeppockets WHERE id=211
139 (622.03407287598): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 6979.9423217773): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 2328.8726806641): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
142 (384.09233093262): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
143 (!!!!! 4455.0895690918): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 11444.091796875): 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=294743664 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (!!!!! 11672.973632812): 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=294743664 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 11246.919631958): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (!!!!! 8367.7768707275): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (!!!!! 2660.0360870361): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
149 (950.09803771973): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
150 (!!!!! 3506.8988800049): 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 (879.04930114746): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
152 (602.00691223145): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
153 (!!!!! 3729.1049957275): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294743664 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294743664 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (!!!!! 1325.1304626465): 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 (45.061111450195): 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 (472.06878662109): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 9644.0315246582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
158 (!!!!! 7858.0379486084): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294743664 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294743664 AND published='1' LIMIT 1
159 (!!!!! 11228.084564209): select jos_twitters.link from jos_twitters where cat=10
160 (!!!!! 11901.85546875): select jos_facebook.link from jos_facebook where cat=10
161 (!!!!! 11962.890625): select jos_google_plus.link from jos_google_plus where cat=10
162 (!!!!! 11949.062347412): select jos_linkedin.link from jos_linkedin where cat=10