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AI Helps Optimize CT Scan X-Ray Radiation Dose

By MedImaging International staff writers
Posted on 10 Mar 2023
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Image: Researchers from Italy have developed and trained neural-network-based models to analyze CT scan images. (Photo courtesy of University of Florence)
Image: Researchers from Italy have developed and trained neural-network-based models to analyze CT scan images. (Photo courtesy of University of Florence)

Computed tomography (CT) is a highly effective and extensive diagnostic tool utilized by modern medicine. Unfortunately, there is growing concern regarding the increasing number of patients undergoing CT scans, and the considerable amount of X-ray radiation to which they are exposed. The ALARA principle, commonly known as "As Low As Reasonably Achievable," implies that a patient should receive the most significant diagnostic benefit with minimal radiation exposure. In practical terms, this principle requires a trade-off since decreasing the level of radiation administered typically results in poorer CT image quality. Accordingly, medical professionals must strike a balance between obtaining high-quality CT images and minimizing a patient's exposure to X-rays to reduce the risk of misdiagnosis.

To strike a balance between image quality and radiation exposure during CT scans, healthcare professionals, including radiologists, may employ an optimization strategy. First, they observe actual images generated by the tomographer to identify abnormalities such as tumors or unusual tissue. Statistical methods are then utilized to calculate the optimal radiation dose and tomographer configuration. This procedure can be generalized by adopting reference CT images obtained by scanning specially designed phantoms that comprise inserts of varying sizes and contrasts, which represent standardized abnormalities. However, manual image analysis is incredibly time-consuming. To address this issue, a team of researchers from the University of Florence (Florence, Italy), in collaboration with radiologists and medical physicists, examined if this process could be automated by using artificial intelligence (AI). The team created and trained an algorithm - a “model observer” - based on convolutional neural networks (CNNs), which could analyze the standardized abnormalities in CT images as efficiently as a professional.

The team needed sufficient training and testing data for their model, for which 30 healthcare professionals visually examined 1000 CT images in a phantom mimicking human tissue. The phantom contained cylindrical inserts of varying diameters and contrasts, and the observers had to identify whether an object was present in the image as well as indicate the level of confidence in their assessment. This generated a dataset of 30,000 labeled CT images captured using various tomographic reconstruction configurations, accurately reflecting human interpretation. The team then implemented two AI models based on different architectures - UNet and MobileNetV2 – and modified the base design of these architectures to allow them perform both classification ("Is there an unusual object in the CT image?") and localization ("Where is the unusual object?"). The models were then trained and tested using images from the dataset.

The research team conducted statistical analyses to evaluate various performance metrics to ensure that the model observers accurately emulated how a human would assess CT images of the phantom. The researchers are optimistic that with further efforts, their model can become a viable mechanism for automated CT image quality assessment. They are confident that applying their AI model observers on a larger scale will enable faster and safer CT evaluations than ever before.

“Our results were very promising, as both trained models performed remarkably well and achieved an absolute percentage error of less than 5%,” said Dr. Sandra Doria of the Physics Department at the University of Florence who led the research team. “This indicated that the models could identify the object inserted in the phantom with similar accuracy and confidence as a human professional, for almost all reconstruction configurations and abnormalities sizes and contrasts.”

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91 (147.10426330566): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (225.06713867188): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (751.01852416992): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (121.11663818359): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (437.97492980957): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (!!!!! 2763.9865875244): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (84.161758422852): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (108.95729064941): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
105 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
106 (72.956085205078): 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=294796485 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (48.87580871582): 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=294796485 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
109 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
110 (252.00843811035): 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=294796485 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (555.99212646484): 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=294796485 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (614.16625976562): 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 (308.03680419922): 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 (102.04315185547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
115 (79.154968261719): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
116 (106.0962677002): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
117 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
118 (100.13580322266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
119 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
120 (155.92575073242): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 39335.012435913): 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 (123.97766113281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
123 (99.897384643555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
124 (354.05158996582): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294796485 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294796485 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 518584.01298523): ( 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 (113.01040649414): ( 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 (375.03242492676): 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 (52.928924560547): 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 (344.99168395996): 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 (361.91940307617): 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 (134.94491577148): 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 (!!!!! 3140.926361084): 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 (690.93704223633): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (570.05882263184): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (277.04238891602): SELECT name FROM jos_deeppockets WHERE id=215
136 (31.948089599609): SELECT name FROM jos_deeppockets WHERE id=215
137 (620.12672424316): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (416.04042053223): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (355.00526428223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
140 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
141 (!!!!! 13346.195220947): TRUNCATE TABLE jos_trademed_module
142 (741.00494384766): 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=294796485 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (130.89179992676): 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=294796485 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (482.08236694336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (767.94624328613): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (172.13821411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
147 (373.84033203125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
148 (!!!!! 1423.8357543945): 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 (185.96649169922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
150 (496.14906311035): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
151 (44.107437133789): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294796485 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294796485 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (31.948089599609): 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 (27.894973754883): 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 (29.087066650391): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (374.07875061035): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
156 (120.87821960449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796485 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796485 AND published='1' LIMIT 1
157 (126.83868408203): select jos_twitters.link from jos_twitters where cat=10
158 (27.894973754883): select jos_facebook.link from jos_facebook where cat=10
159 (32.186508178711): select jos_google_plus.link from jos_google_plus where cat=10
160 (30.040740966797): select jos_linkedin.link from jos_linkedin where cat=10
161 (278.94973754883): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 1853.9428710938): insert into jos_banners_delta values (14615,'2025-04-30 08:49:38','18.118.210.233','view'),(14202,'2025-04-30 08:49:38','18.118.210.233','view'),(14203,'2025-04-30 08:49:38','18.118.210.233','view')