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New Formulas for Child-Specific Doses for Pediatric PET Patients

By MedImaging International staff writers
Posted on 16 Feb 2010
A new study has gathered data that may provide clinicians with new formulas--specific to pediatrics--to calculate the amount of radiotracer that should be injected based on the patient's weight.

Studies have shown positron emission tomography's (PET) value as a minimally invasive, painless, and safe diagnostic tool for many pediatric conditions. In a study published in the February 2010 issue of the Journal of Nuclear Medicine (JNM), researchers at the Children's Hospital of Philadelphia (CHOP; PA, USA) and the University of Pennsylvania (Penn) investigated clear dose guidelines in PET exams on children.

"These findings mean that PET--a very common nuclear medicine procedure--can be used in children with methods that are even more patient-specific than those currently employed,” said Roberto Accorsi, Ph.D., former research assistant professor of radiology at CHOP-Penn and lead author of the study.

This study is one more contribution to the medical imaging community's overall efforts to reduce radiation dose to children. Nuclear medicine specialists are continuously refining methodologies in order to preserve image quality and minimize radiation exposure during pediatric PET exams. Since medical research published in recently highlights the health risks of exposure to ionizing radiation, many have looked to the medical community for ways to reduce exposure during medical imaging exams. Although the nuclear medicine exam's benefits to the patient far outweigh any potential risks associated with radiation, the nuclear medicine community seeks to uphold practices that are consistent and mindful of patients' concerns.

In nuclear medicine, there are well-established guidelines for administering radiopharmaceutical doses for adults; however, there is little guidance for administering pediatric doses. Therefore, the CHOP-Penn study set out to examine how nuclear medicine physicians can take into consideration a child's lighter weight and body size and adjust the dose and scan time accordingly, while maintaining high-quality imaging for the best diagnosis possible.

Image quality for PET depends greatly on the patient's weight and body build. Meaning, the larger and heavier the patient, the more injection dose, or possibly a longer scan time is needed to obtain a quality image. For patients who are lighter and have less body mass--such as in pediatric patients--less injection dose or a reduced scan time may still allow for high-quality images.

"The results of this study show that, due to children's relatively small size and light weight, it is possible to reduce radiological dose [or scan time] while preserving image quality as compared to PET imaging in adults,” said Dr. Accorsi. "Minimizing exposure to radiation is important to all patients, but especially for young children.”

CHOP-Penn researchers acquired and analyzed data from 73 patients. The patients' weight ranged from 11 kg to 90 kg. Researchers reported in their study that when following an injection protocol proportional to weight, the data quality of PET images was found to improve with decreasing weight. The study provides practical injection protocols to trade this advantage for decreased scan time or dose at constant image quality.

Studies such as the one published in JNM are helping physicists and physicians gather new data about improving dose regimens to get the highest-quality diagnostic image while using the lowest amount of radiation practical, adhering to the As Low As Reasonably Achievable (ALARA) principle.

Related Links:
Children's Hospital of Philadelphia
University of Pennsylvania


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95 (309.94415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (499.01008605957): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (112.05673217773): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (360.01205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (829.93507385254): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (211.00044250488): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (240.80276489258): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (288.96331787109): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 2551.0787963867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
105 (504.97055053711): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
106 (566.95938110352): 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=294727980 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (569.10514831543): 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=294727980 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 3906.0115814209): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
109 (!!!!! 3308.0577850342): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
110 (322.81875610352): 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=294727980 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 1521.110534668): 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=294727980 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 1616.9548034668): 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 (!!!!! 7326.1260986328): 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 (!!!!! 7385.9691619873): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
115 (741.00494384766): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
116 (!!!!! 1065.9694671631): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
117 (595.0927734375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
118 (!!!!! 1696.1097717285): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
119 (!!!!! 1012.0868682861): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
120 (!!!!! 2413.9881134033): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
121 (!!!!! 1387.1192932129): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
122 (439.88227844238): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 222236.87171936): 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 (!!!!! 3062.9634857178): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727980 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727980 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 1267.9100036621): ( 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 (!!!!! 2786.8747711182): ( 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 (307.79838562012): 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 (108.95729064941): 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 (!!!!! 2186.0599517822): 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 (221.01402282715): 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 (210.04676818848): 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 (!!!!! 2676.0101318359): 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 (!!!!! 5502.9392242432): 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 (!!!!! 6203.8898468018): 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 (!!!!! 4204.0348052979): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 1500.129699707): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (!!!!! 1261.9495391846): SELECT name FROM jos_deeppockets WHERE id=213
138 (398.87428283691): SELECT name FROM jos_deeppockets WHERE id=213
139 (!!!!! 1516.1037445068): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 1241.92237854): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 7539.9875640869): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
142 (830.88874816895): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
143 (!!!!! 26751.041412354): TRUNCATE TABLE jos_trademed_module
144 (155.92575073242): 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=294727980 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (844.00177001953): 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=294727980 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 1929.0447235107): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (566.00570678711): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (725.98457336426): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
149 (!!!!! 5939.9604797363): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
150 (!!!!! 7124.1855621338): 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 (!!!!! 11134.86289978): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
152 (195.98007202148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
153 (!!!!! 1024.0077972412): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727980 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727980 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (773.90670776367): 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 (51.021575927734): 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 (47.922134399414): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (225.06713867188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
158 (194.07272338867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727980 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727980 AND published='1' LIMIT 1
159 (!!!!! 1114.1300201416): select jos_twitters.link from jos_twitters where cat=10
160 (71.048736572266): select jos_facebook.link from jos_facebook where cat=10
161 (207.90100097656): select jos_google_plus.link from jos_google_plus where cat=10
162 (131.13021850586): select jos_linkedin.link from jos_linkedin where cat=10