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AI Software Can Cut PET Scan Time in Half

By MedImaging International staff writers
Posted on 27 May 2022
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Image: Equivalent diagnostic image quality with SubtlePET AI (Photo courtesy of Subtle Medical)
Image: Equivalent diagnostic image quality with SubtlePET AI (Photo courtesy of Subtle Medical)

Recent research in PET has focused on decreasing noise and increasing signal-to-noise ratios (SNR). Digital PET with silicon photomultipliers (SiPM) has led to improved timing, energy, spatial resolution, and effective time-of-flight (TOF) sensitivity. This has resulted in faster scanning with less injected activity. However, despite these advances, there is an ever-increasing demand for PET scans, which can contribute to significant delays in scheduling examinations and patient management. Deep learning (DL), a subdivision of artificial intelligence (AI), has many emerging applications in nuclear medicine. DL is able to increase PET resolution, decrease noise, and thus enhance image quality. It may allow for reducing injected activity, acquisition time, or a combination of both. Now, a new study that investigated whether AI-based denoising halves PET acquisition time in digital PET/CT has found that AI allows [18F]FDG PET duration in digital PET/CT to be halved, while restoring degraded ½-duration PET image quality.

The study by investigators at Baclesse Cancer Center (Caen, France) examined Subtle Medical, Inc.’s (Menlo Park, CA, USA) SubtlePET post-reconstruction PET denoising software that has been approved by the Food and Drug Administration and validated by the European Commission for [18F]FDG PET. The algorithm is based on deep convolutional neural networks (DCNN), the most common DL architecture. SubtlePET uses multi-slice 2.5D encoder-decoder U-Net DCNN. It takes the pixel’s neighborhood into account to reduce noise and increase image quality. Using a residual learning approach that is optimized for quantitative (L1 norm) and structural similarity (SSIM), it has learned to separate and suppress noise components while preserving non-noise components.

The software applies denoising to improve the image quality of low count PET (positron emission tomography) scans acquired in up to 25% of the original scan time, enabling centers to expedite patient care and improve patient comfort during PET exams. SubtlePET is FDA-cleared for use with 18F-FDG and 18F-Amyloid tracers and is CE-marked for use with 18F-FDG, 18F-Amyloid, 18F-Fluciclovine, 18F-DOPA, 18F-Choline, 18F-DCFPyL, Ga-68 Dotatate, and Ga-68 PSMA radiotracer PET images, expanding coverage for Prostate (PSMA) and Neuroendocrine tumors. The vendor-neutral software is a virtual upgrade to any brand of PET or PET/CT machine that boosts scanner performance across the entire fleet.

In the latest study, researchers aimed to evaluate the feasibility of halving PET acquisition time in a routine clinical setting by using SubtlePET while preserving visual and semi-quantitative PET performances in digital TOF PET/CT. The prospective study showed good visual and semi-quantitative performances of AI-denoised half-count PET compared to original PET in a digital PET/CT. The researchers simulated a two-fold reduction in the PET acquisition time and then applied SubtlePET. All PET series were successfully denoised within two minutes in an automatic workflow using a common GPU card. This makes it compatible with routine clinical use.

Visually, global image quality scores were similar between PET90 and PET45AI but lower and clinically insufficient in half-count PET45 due to high noise. The researchers obtained a few discordances (2.3%) between original PET90 and denoised PET45AI in the absolute detection of 856 lesions. The study findings support the routine use of Subtle PET combined with a two-fold faster PET acquisition. According to the researchers, the benefit of decreasing PET duration, thus reducing waiting time for appointments and helping patients who experience discomfort, outweighs the minor decrease in performance.

Related Links:
Baclesse Cancer Center 
Subtle Medical, Inc. 

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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 (109.91096496582): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (51.021575927734): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (69.856643676758): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (24.080276489258): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (24.795532226562): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
105 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
106 (84.161758422852): 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=294793125 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (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_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=294793125 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 3865.9572601318): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
109 (123.02398681641): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
110 (62.942504882812): 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=294793125 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (499.01008605957): 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=294793125 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (621.79565429688): 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 (431.06079101562): 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 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
115 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
116 (102.99682617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
117 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
118 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
119 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
120 (270.12825012207): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 40421.962738037): 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 (102.04315185547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
123 (60.796737670898): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
124 (463.96255493164): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294793125 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294793125 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 816518.0683136): ( 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 (!!!!! 872067.92831421): ( 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 (145.19691467285): 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 (123.02398681641): 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 (146.15058898926): 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 (174.04556274414): 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 (132.08389282227): 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 (151.8726348877): 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 (!!!!! 1863.0027770996): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (!!!!! 1255.0354003906): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (138.0443572998): SELECT name FROM jos_deeppockets WHERE id=215
136 (30.994415283203): SELECT name FROM jos_deeppockets WHERE id=215
137 (450.84953308105): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (362.87307739258): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (799.17907714844): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
140 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
141 (!!!!! 8526.086807251): TRUNCATE TABLE jos_trademed_module
142 (89.883804321289): 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=294793125 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (!!!!! 3271.1029052734): 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=294793125 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (859.02214050293): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (50.783157348633): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
147 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
148 (!!!!! 1042.8428649902): 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 (214.0998840332): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
150 (85.830688476562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
151 (!!!!! 4281.9976806641): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294793125 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294793125 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (44.107437133789): 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 (28.848648071289): 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 (36.001205444336): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (!!!!! 3102.0641326904): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
156 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793125 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793125 AND published='1' LIMIT 1
157 (57.93571472168): select jos_twitters.link from jos_twitters where cat=10
158 (33.855438232422): select jos_facebook.link from jos_facebook where cat=10
159 (32.901763916016): select jos_google_plus.link from jos_google_plus where cat=10
160 (33.140182495117): select jos_linkedin.link from jos_linkedin where cat=10
161 (200.03318786621): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 9173.8700866699): insert into jos_banners_delta values (14615,'2025-05-01 18:30:16','18.220.167.202','view'),(14202,'2025-05-01 18:30:16','18.220.167.202','view'),(14203,'2025-05-01 18:30:16','18.220.167.202','view')