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Study Shows How to Cut Contrast Dye Use in CT

By MedImaging International staff writers
Posted on 13 Jun 2022
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Image: Amid a global shortage, a new study has shown how to cut contrast dye use by 83% (Photo courtesy of UCSF)
Image: Amid a global shortage, a new study has shown how to cut contrast dye use by 83% (Photo courtesy of UCSF)

The global shortage of contrast dye, which began in April with a COVID-related supply chain disruption, is expected to last at least several more weeks. As the worldwide shortage of contrast dye for medical imaging continues, a new study has quantified strategies that can be employed by medical facilities to safely reduce dye use in computed tomography (CT) by up to 83%.

Researchers at UC San Francisco (San Francisco, CA, USA) have modeled three conservation strategies that are weight-based (rather than fixed) dosing, reducing contrast dose while reducing tube voltage on scanners, and replacing contrast-enhanced CT with non-enhanced CT when it will minimally affect diagnostic accuracy. That third strategy – forgoing the dye in some cases of CT when it would result in only small impact on diagnostic accuracy – yielded the most dramatic reduction of dye use: 78%. CT is the most common use for the dye. These conservation methods could continue past the current shortage to reduce the use of contrast dye in general, according to the researchers.

Researchers modeled the three strategies individually and in combination using a sample of 1.04 million CT exams in the UCSF International CT Dose Registry from January 2015 to March 2021. The registry includes CT scan data from 161 imaging facilities associated with 27 health care organizations. On its own, weight-based dosing for abdomen, chest, cardiac, spine and extremity imaging reduced dye use by 10%; reducing the tube voltage in appropriate patients allowed a dye reduction of 25%. These two measures combined with using non-dye CT when possible led to a total reduction of 83%. Some facilities may not be able to execute all three strategies at once, but each can help conserve supply, according to the researchers.

And it is not just radiologists who need to know about them. When the contrast shortage subsides, medical facilities should consider continuing some of these practices that conserve contrast dye, according to the researchers. For example, reducing the tube voltage not only allows reducing the contrast volume that must be used, but also results in significantly lower radiation doses to patients. Tailoring doses to each patient’s weight allows lower dosing volumes for many patients. In addition, the researchers noted that their analysis highlights the large amount of contrast that is wasted when single-dose vials are used to deliver contrast. Hospitals and imaging centers that routinely use single-dose dye vials should consider using larger multi-dose vials, which allows for exact dosing and obviates the need to discard unused portions, according to the researchers.

“Contrast is essential in any situation where we need to assess the blood vessels – for example, for some trauma patients or those with a suspected acute gastrointestinal bleed – and it is also needed for evaluation of certain cancers, such as in the liver or pancreas,” said senior study author Rebecca Smith-Bindman, MD, UCSF professor in the Department of Epidemiology and Biostatistics. “However, most CT scans are done for less specific indications such as abdominal pain in a patient with suspected appendicitis. These can and should be done without contrast during the shortage, because the loss of information in these patients will be acceptable for most patients.”

“Given the acute shortage, it’s important that clinicians who order imaging exams coordinate with radiology to cancel scans that aren’t absolutely necessary, postpone exams that can be safely delayed, replace CT with MRI and ultrasound where possible, and order an unenhanced scan where possible. Further, clinicians should communicate with their patients about why this is necessary. It is crucial that contrast be conserved for clinical situations where its use is essential for accurate diagnosis,” added Smith-Bindman.

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89 (45.061111450195): 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 (49.114227294922): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
105 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
106 (52.928924560547): 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=294793359 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (428.91502380371): 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=294793359 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (109.91096496582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
109 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
110 (50.067901611328): 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=294793359 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (510.21575927734): 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=294793359 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (845.19386291504): 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 (320.9114074707): 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 (74.863433837891): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
115 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
116 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
117 (212.9077911377): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
118 (242.94853210449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
119 (221.96769714355): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
120 (566.00570678711): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 62523.126602173): 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
122 (90.122222900391): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
123 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
124 (594.8543548584): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294793359 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294793359 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 800696.13456726): ( 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 (123.97766113281): ( 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 (!!!!! 2881.0501098633): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
128 (101.08947753906): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
129 (!!!!! 1194.953918457): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
130 (!!!!! 3327.1312713623): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
131 (435.82916259766): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
132 (215.05355834961): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
133 (!!!!! 1501.0833740234): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (!!!!! 1109.1232299805): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (!!!!! 1595.9739685059): SELECT name FROM jos_deeppockets WHERE id=215
136 (63.896179199219): SELECT name FROM jos_deeppockets WHERE id=215
137 (567.19779968262): 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 '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (!!!!! 1045.9423065186): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (915.0505065918): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
140 (117.06352233887): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
141 (!!!!! 41513.919830322): TRUNCATE TABLE jos_trademed_module
142 (552.17742919922): 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=294793359 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (890.01655578613): 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=294793359 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (!!!!! 4559.0400695801): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (!!!!! 10812.044143677): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (504.0168762207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
147 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
148 (!!!!! 3219.1276550293): 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
149 (!!!!! 3776.0734558105): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
150 (108.95729064941): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
151 (!!!!! 1055.9558868408): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294793359 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294793359 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (59.843063354492): 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=215 or channel_id is null)
153 (43.869018554688): 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=215 or channel_id is null)
154 (183.8207244873): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (131.84547424316): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
156 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793359 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793359 AND published='1' LIMIT 1
157 (159.97886657715): select jos_twitters.link from jos_twitters where cat=10
158 (30.040740966797): select jos_facebook.link from jos_facebook where cat=10
159 (28.133392333984): select jos_google_plus.link from jos_google_plus where cat=10
160 (26.941299438477): select jos_linkedin.link from jos_linkedin where cat=10
161 (311.13624572754): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 4801.0349273682): insert into jos_banners_delta values (14615,'2025-05-01 01:45:02','18.188.228.10','view'),(14202,'2025-05-01 01:45:02','18.188.228.10','view'),(14203,'2025-05-01 01:45:02','18.188.228.10','view')