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Filming Organs and Joints in Real Time Using New MRI Technology

By MedImaging International staff writers
Posted on 30 Sep 2010
Instructing the patient "to hold still” is crucial for patients being examined by magnetic resonance imaging (MRI). It is the only way to obtain clear images for diagnosis. Up to now, it was therefore almost impossible to image moving organs using MRI. German Scientists have now succeeded in significantly reducing the time required for recording images--to just one-fiftieth of a second.

With this breakthrough, the dynamics of organs and joints can be filmed "live” for the first time: movements of the eye and jaw as well as the bending knee and the beating heart. The new MRI method has the potential to add important information about diseases of the joints and the heart. In many instances, MRI scanning should become easier and more comfortable for patients.

A process that required several minutes until well into the 1980s, now only takes a matter of seconds: the recording of cross-sectional images of the human body by MRI. This was achieved by the FLASH (fast low angle shot) technique developed by German scientists Dr. Jens Frahm and Dr. Axel Haase at the Max Planck Institute for Biophysical Chemistry (Göttingen, Germany). FLASH transformed MRI technology and was largely responsible for its establishment as a most important modality in diagnostic imaging. At present, however, the procedure is still too slow for the examination of rapidly moving organs and joints. For example, to trace the movement of the heart, the measurements must be synchronized with an electrocardiogram (ECG) while the patient holds the breath. Afterwards, the data from different heartbeats have to be combined into a film.

The researchers, working with Dr. Jens Frahm, head of the nonprofit Biomedizinische NMR Forschungs, GmbH (Gottingen, Germany), now succeeded in additionally accelerating the image acquisition process. The new MRI method developed by Dr. Frahm, DR. Martin Uecker, and Dr. Shuo Zhang reduces the image acquisition time to 20 milliseconds, making it possible to obtain "live recordings” of moving joints and organs at so far inaccessible temporal resolution and without artifacts. Filming the dynamics of the jaw during opening and closing of the mouth is just as easy as filming the movements involved in speech production or the rapid beating of the heart.

"A real-time film of the heart enables us to directly monitor the pumping of the heart muscle and the resulting blood flow--heartbeat by heartbeat and without the patient having to hold the breath,” explained Dr. Frahm. The scientists believe that the new technique could help to improve the diagnosis of conditions such as coronary heart disease and myocardial insufficiency. Another application involves minimally invasive interventions, which, due to this discovery, could be carried out in the future using MRI instead of X-rays. "However, as it was the case with FLASH, we must first learn how to use the real-time MRI possibilities for medical purposes,” said Dr. Frahm. "New challenges therefore also arise for doctors. The technical progress will have to be ‘translated' into clinical protocols that provide optimum responses to the relevant medical questions.”

To achieve the breakthrough to MRI measurement times that only take very small fractions of a second, several developments had to be successfully combined with each other. While still relying on the FLASH technique, the scientists used a radial encoding of the spatial data that renders the images insensitive to movements. Mathematics was then required to reduce the acquisition times further. "Considerably fewer data are recorded than are usually necessary for the calculation of an image. We developed a new mathematical reconstruction technique which enables us to calculate a meaningful image from data which are, in fact, incomplete,” explained Dr. Frahm.

In the extreme case, it is possible to calculate an image of comparative quality out of only 5% of the data required for a normal image, which corresponds to a reduction of the measurement time by a factor of 20. As a result, the scientists have accelerated MRI from the mid-1980s by a factor of 10,000.

Although these fast MRI measurements can be easily implemented on current MRI devices, something of a bottleneck exists when it comes to the availability of sufficiently powerful computers for image reconstruction. Physicist Dr. Uecker explained, "The computational effort required is gigantic. For example, if we examine the heart for only a minute in real time, between 2,000 and 3,000 images arise from a data volume of two gigabytes.”

Dr. Uecker consequently designed the mathematical process in such a way that it is divided into steps that can be calculated in parallel. These complicated calculations are carried out using fast graphical processing units (GPUs) that were originally developed for computer games and three-dimensional visualization. "Our computer system requires about 30 minutes at present to process one minute's worth of film,” said Dr. Uecker.

Therefore, according to the scientists, it will take a while until MRI systems are equipped with computers that will enable the immediate calculation and live presentation of the images during the scan. In order to minimize the time their technology will take to reach practical application, the Göttingen researchers are working in close cooperation with the company Siemens Healthcare (Erlangen, Germany).

The research findings were published online August 27, 2010, in the journal NMR in Biomedicine.

Related Links:
Max Planck Institute for Biophysical Chemistry
Biomedizinische NMR Forschungs
Siemens Healthcare


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82 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
83 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
84 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
85 (42.915344238281): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (!!!!! 3201.961517334): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294731386 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (82.969665527344): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294731386 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (41.961669921875): 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 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (69.856643676758): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
105 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
106 (79.154968261719): 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=294731386 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (72.002410888672): 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=294731386 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (75.817108154297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
109 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
110 (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 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=294731386 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (576.97296142578): 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=294731386 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (759.84001159668): 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 (527.85873413086): 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 (108.00361633301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
115 (68.187713623047): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
116 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
117 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
118 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
119 (54.836273193359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
120 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
121 (53.167343139648): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
122 (499.01008605957): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 56605.815887451): 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
124 (666.85676574707): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294731386 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294731386 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 25898.933410645): ( 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 (101.08947753906): ( 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 (435.11390686035): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (465.15464782715): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (365.01884460449): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (49.114227294922): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (284.91020202637): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (46.014785766602): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (313.04359436035): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (46.014785766602): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (502.10952758789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (478.02925109863): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (266.79039001465): SELECT name FROM jos_deeppockets WHERE id=212
138 (41.961669921875): SELECT name FROM jos_deeppockets WHERE id=212
139 (786.78131103516): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (649.92904663086): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 2687.931060791): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
142 (128.98445129395): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
143 (!!!!! 17501.11579895): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 2225.8758544922): 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=294731386 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (114.91775512695): 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=294731386 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (529.05082702637): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (75.817108154297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (!!!!! 1714.9448394775): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
149 (100.13580322266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
150 (!!!!! 1579.0462493896): 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
151 (95.129013061523): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
152 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
153 (71.048736572266): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294731386 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294731386 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (45.061111450195): 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)
155 (39.815902709961): 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)
156 (55.074691772461): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (180.00602722168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
158 (74.863433837891): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731386 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731386 AND published='1' LIMIT 1
159 (126.12342834473): select jos_twitters.link from jos_twitters where cat=10
160 (45.061111450195): select jos_facebook.link from jos_facebook where cat=10
161 (39.815902709961): select jos_google_plus.link from jos_google_plus where cat=10
162 (36.954879760742): select jos_linkedin.link from jos_linkedin where cat=10
163 (346.18377685547): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1421.9284057617): insert into jos_banners_delta values (14615,'2025-06-27 18:23:07','216.73.216.249','view'),(14202,'2025-06-27 18:23:07','216.73.216.249','view'),(14203,'2025-06-27 18:23:07','216.73.216.249','view')