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New MRI Technology Enables Non-Invasive Assessment of Interstitial Fluid Flow

By MedImaging International staff writers
Posted on 13 Dec 2023
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Image: MRI has the potential to determine interstitial fluid flow velocity non-invasively (Photo courtesy of NCNST)
Image: MRI has the potential to determine interstitial fluid flow velocity non-invasively (Photo courtesy of NCNST)

Interstitial fluid flow is closely connected with drug delivery and distribution, playing a vital role in their therapeutic effects on tumors. However, there are very few non-invasive measurement methods available for measuring low-velocity biological fluid flow. The interstitial fluid velocity is four orders of magnitude lower than blood flow. The phase-contrast MRI (PC-MRI) technology is widely used to measure the velocity of rapid flow in biological tissues, such as blood. PC-MRI requires significant gradient intensity and duration when used for slow flow measurements, although high gradient intensity is especially sensitive to motion and creates motion artifacts during imaging. Additionally, when measuring slow flow velocity, the encoding gradient is large, and the echo time is relatively long. The SNR is significantly lost as the gradient echo is based on T2 relaxation decay. As a result, PC-MRI application is very limited.

Now, a team of researchers from the National Center for Nanoscience and Technology (NCNST, Beijing, China) has proposed a new, non-invasive MRI technology designed specifically for measuring interstitial fluid flow. The researchers combined PC-MRI with an improved stimulation echo sequence (ISTE). Conventional PC-MRI usually uses gradient echo, spin echo (SE), and stimulated echo (STE). Compared to the gradient echo, SE uses a 180° focusing pulse to focus the signal in the transverse plane, and its signal is affected by T2 relaxation, which decays more slowly and has a slightly higher image SNR. STE excites a part of the signal to the longitudinal plane and mitigates part of the T2 relaxation decay.

However, STE is not superior to SE under any TE condition. Hence, the research team proposed ISTE which refocuses the magnetic moment vectors in the longitudinal plane and yields better SNRs than STE or SE. Their effort led to an increase in the velocity encoding gradient interval, which can minimize the diffusion sensitivity factor under the same flow velocity measurement sensitivity, thereby reducing the signal loss caused by diffusion and improving the detection accuracy of slow-flow imaging. The researchers are hopeful that their novel method can further improve understanding of interstitial fluid flow.

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99 (77.962875366211): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (97.990036010742): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (62.942504882812): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (442.9817199707): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (121.8318939209): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (132.08389282227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
105 (292.06275939941): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
106 (210.04676818848): 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=294799576 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (905.03692626953): 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=294799576 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 1764.0590667725): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
109 (337.83912658691): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
110 (128.03077697754): 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=294799576 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 1005.8879852295): 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=294799576 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 7820.1293945312): 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 (!!!!! 6088.0184173584): 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 (!!!!! 1111.9842529297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
115 (!!!!! 12553.930282593): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
116 (!!!!! 10733.127593994): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
117 (!!!!! 8414.9837493896): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
118 (!!!!! 6779.9091339111): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
119 (!!!!! 8967.1611785889): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
120 (!!!!! 7915.9736633301): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 176376.8196106): 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 (232.93495178223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
123 (198.8410949707): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
124 (!!!!! 2074.0032196045): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294799576 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294799576 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 1880300.9986877): ( 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 (!!!!! 2476.9306182861): ( 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 (264.88304138184): 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 (255.10787963867): 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 (67.949295043945): 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 (894.06967163086): 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 (53.882598876953): 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 (436.78283691406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (308.99047851562): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (220.06034851074): SELECT name FROM jos_deeppockets WHERE id=212
136 (57.220458984375): SELECT name FROM jos_deeppockets WHERE id=212
137 (465.15464782715): 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 '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (342.84591674805): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (94.890594482422): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
140 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
141 (!!!!! 8676.0520935059): TRUNCATE TABLE jos_trademed_module
142 (128.03077697754): 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=294799576 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (!!!!! 1524.9252319336): 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=294799576 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (!!!!! 2297.1630096436): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (309.94415283203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (144.95849609375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
147 (411.9873046875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
148 (!!!!! 8378.9825439453): 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 (187.87384033203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
150 (100.85105895996): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
151 (480.89027404785): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294799576 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294799576 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (183.10546875): 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=212 or channel_id is null)
153 (99.897384643555): 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=212 or channel_id is null)
154 (89.883804321289): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (194.07272338867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
156 (143.05114746094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294799576 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294799576 AND published='1' LIMIT 1
157 (250.81634521484): select jos_twitters.link from jos_twitters where cat=10
158 (149.01161193848): select jos_facebook.link from jos_facebook where cat=10
159 (89.883804321289): select jos_google_plus.link from jos_google_plus where cat=10
160 (88.930130004883): select jos_linkedin.link from jos_linkedin where cat=10
161 (438.92860412598): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 4689.9318695068): insert into jos_banners_delta values (14615,'2025-04-29 22:26:18','3.143.110.165','view'),(14202,'2025-04-29 22:26:18','3.143.110.165','view'),(14203,'2025-04-29 22:26:18','3.143.110.165','view')