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Ultra-High Resolution Brain PET Scanner Offers Potential for Early Diagnosis of Neurological Conditions

By MedImaging International staff writers
Posted on 03 Jul 2023

While PET (Positron Emission Tomography) has been instrumental in studying neurological phenomena and diagnostics, its potential has been somewhat restricted due to the subpar spatial resolution of existing PET systems. Now, amidst the technological improvements in PET instrumentation and a global initiative to enhance brain PET imaging capabilities, scientists have designed and built a novel ultra-high resolution (UHR) brain PET scanner that offers unmatched resolution, paving the way for more precise brainstem studies.

The new UHR-dedicated brain PET system developed by researchers at the University of Sherbrooke (Québec, Canada) could potentially characterize previously unidentifiable brain regions known to contribute to Alzheimer's disease, depressive disorders, visual attention disorders, tinnitus, and other conditions. In contrast to conventional PET scanners, this UHR scanner boasts truly pixelated detectors and achieves a 1.25 mm isotropic spatial resolution. This represents a two-fold improvement over the High Resolution Research Tomograph (HRRT) scanner, the previous gold standard for brain PET imaging for the last two decades. This advancement enables visualization of the radiotracer uptake in the human brain in the range of a few tens of microliters for the first time.

To demonstrate the UHR scanner's ability to delineate small cerebral structures and accurately quantify in vivo tracer concentration, researchers compared it to a whole-body PET scanner. Three patients prescribed an 18F-FDG PET scan underwent their clinical examination on the whole-body PET scanner followed by a brain scan on the UHR scanner. Images from both scanners were compared, and region identification was performed. Standardized uptake values relative to the cerebellum were also calculated. Several brain regions, especially in the brainstem, were readily identifiable visually in UHR images but were not visualized by the whole-body PET scanner. The inferior and superior colliculi, the subthalamic nuclei, and the red nuclei were clearly delineated in the UHR images.

Furthermore, the thalamus, usually seen as a whole in standard PET images, could be visually segmented into smaller nuclei using the UHR scanner. Hypermetabolic regions of the cortex were also noticeable in the UHR images but barely perceivable with the whole-body PET scanner. The first UHR prototype is fully operational and in use for research applications at the Sherbrooke Molecular Imaging Center. In the coming months, additional UHR units will be deployed to brain research centers across North America, and progress will be made toward obtaining necessary regulatory approvals for clinical imaging. The performance of a second UHR model, featuring new detectors to improve the overall resolution across the field of view, will also be tested shortly.

“The UHR scanner is a quantum leap for PET image resolution,” said Vincent Doyon, a master’s student in Radiation Sciences and Biomedical Imaging at the University of Sherbrooke. “Proper visualization of brainstem nuclei will provide the ability to detect early changes associated with many diseases and offer a potential avenue for early diagnosis. This will impact both research and clinical settings.”

Related Links:
University of Sherbrooke

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90 (36.001205444336): 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`
91 (123.02398681641): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (87.02278137207): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (66.995620727539): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (73.19450378418): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (292.06275939941): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (682.83081054688): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (72.956085205078): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (39.815902709961): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (171.89979553223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
106 (113.01040649414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
107 (540.01808166504): 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=294797751 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (385.04600524902): 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=294797751 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (!!!!! 1682.0430755615): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
110 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
111 (495.91064453125): 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=294797751 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (486.85073852539): 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=294797751 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (820.87516784668): 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 (967.97943115234): 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
115 (142.09747314453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
116 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
117 (98.943710327148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
118 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
119 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
120 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
121 (370.02563476562): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
122 (!!!!! 37443.876266479): 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
123 (180.95970153809): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
124 (80.108642578125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
125 (617.02728271484): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294797751 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294797751 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 765784.02519226): ( 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 (!!!!! 1693.0103302002): ( 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
128 (356.91261291504): 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 (82.015991210938): 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
130 (283.00285339355): 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 (69.856643676758): 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
132 (188.11225891113): 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 (54.836273193359): 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
134 (!!!!! 3556.9667816162): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (576.97296142578): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (258.20732116699): SELECT name FROM jos_deeppockets WHERE id=215
137 (53.167343139648): SELECT name FROM jos_deeppockets WHERE id=215
138 (695.94383239746): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (629.90188598633): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (111.10305786133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
141 (86.784362792969): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
142 (!!!!! 24143.934249878): TRUNCATE TABLE jos_trademed_module
143 (!!!!! 7145.1663970947): 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=294797751 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (186.92016601562): 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=294797751 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (593.90068054199): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (!!!!! 3545.9995269775): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (101.08947753906): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
148 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
149 (!!!!! 1632.9288482666): 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
150 (102.99682617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
151 (105.14259338379): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
152 (52.928924560547): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294797751 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294797751 AND type='deeppockets_item' AND published='1' LIMIT 1
153 (41.007995605469): 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 (38.14697265625): 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)
155 (44.107437133789): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
156 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
157 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797751 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797751 AND published='1' LIMIT 1
158 (144.95849609375): select jos_twitters.link from jos_twitters where cat=10
159 (38.14697265625): select jos_facebook.link from jos_facebook where cat=10
160 (63.896179199219): select jos_google_plus.link from jos_google_plus where cat=10
161 (45.061111450195): select jos_linkedin.link from jos_linkedin where cat=10
162 (460.14785766602): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
163 (!!!!! 3525.0186920166): insert into jos_banners_delta values (14615,'2025-04-30 07:20:05','13.59.113.183','view'),(14202,'2025-04-30 07:20:05','13.59.113.183','view'),(14203,'2025-04-30 07:20:05','13.59.113.183','view')