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MRI Helps Evaluate Potential Living Liver Donors

By MedImaging International staff writers
Posted on 09 Aug 2017
Image: An example of an MRI in a potential living liver donor demonstrating hepatic steatosis (yellow) of the whole liver (Photo courtesy of the University of Toronto).
Image: An example of an MRI in a potential living liver donor demonstrating hepatic steatosis (yellow) of the whole liver (Photo courtesy of the University of Toronto).
New magnetic resonance imaging (MRI) contrast agents and pulse sequence techniques can be used to noninvasively evaluate the livers of potential live donors, according to a new review.

Researchers at the University of Toronto (Canada) conducted a review of studies that focusing on the role of state-of-the-art MRI-based techniques in the comprehensive evaluation of living donors in a single-visit. The techniques reviewed include assessment of the liver vasculature via MRI angiography; assessment of the biliary tract via conventional T2-weighted MRI cholangiography and T1-weighted gadoxetate disodium–enhanced MR cholangiography; and evaluation of hepatic steatosis via T2-corrected multiecho chemical shift–based water-fat separation MRI and high-speed T2-corrected multiecho MR spectroscopy (MRS).

Contrast-enhanced MR angiography (MRA), for example, permits hepatic arterial system visualization to the segmental level using gadopentetate dimeglumine as the contrast agent, providing a high signal-to-noise ratio due to its high T1 relaxation rate. Contrast-enhanced MRA has been shown to be as accurate as computerized tomography angiography (CTA) at detecting surgically important anatomic variants of the hepatic vasculature in donor candidates, with accuracy of 86%, 93%, and 68% for the hepatic artery, portal vein, and hepatic vein, respectively.

The increasing use of hepatocyte-specific contrast agent in liver MRI, such as gadobenate dimeglumine and gadoxetic disodium, can accurately display intrahepatic and extrahepatic biliary anatomy. A recent study classified normal and variant biliary systems correctly using a single-dose of gadoxetic disodium enhanced T1-weighted MRC, which could prove an alternative to CT cholangiogram for preoperative evaluation of donor candidates. Other studies show the quality of hepatobiliary phase images obtained using the CAIPIRINHA technique are significantly improved, which could enable gadoxetic disodium–enhanced T1-weighted MRC to provide a better visualization of biliary variants.

MRI techniques can also be used for noninvasive evaluation of hepatic steatosis by separating liver signal into its fat and water signal components first, and then calculating the hepatic fat fraction. MRI-measured hepatic fat fraction, which includes signal fat fraction and proton-density fat fraction, has a strong correlation with histologic grade. The researchers also reviewed MRI and MRS methods used for signal fat fraction and proton-density fat fraction measurement for the evaluation of hepatic steatosis. The review was published in the July 2017 issue of the American Journal of Roentgenology.

“Since the first adult-to-adult transplantation of a right liver lobe reported in 1994, the number of living-donor liver transplants has increased dramatically with good results, similar to those of cadaver liver transplantation,” said lead author Kartik Jhaveri, MD, of the Joint Department of Medical Imaging. “To guide safe harvesting of the graft from donors, an accurate preoperative evaluation of potential living liver donors for conditions that increase the donor's surgical risk is crucial.”

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89 (52.928924560547): 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 (96.08268737793): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (51.975250244141): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (!!!!! 2486.9441986084): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (91.075897216797): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (60.796737670898): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (39.815902709961): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (37.193298339844): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (126.12342834473): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
105 (138.0443572998): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
106 (118.01719665527): 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=294770351 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (80.108642578125): 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=294770351 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 2099.9908447266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
109 (101.08947753906): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
110 (88.930130004883): 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=294770351 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (745.77331542969): 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=294770351 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (993.01338195801): 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 (714.06364440918): 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 (153.0647277832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
115 (104.90417480469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
116 (111.10305786133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
117 (113.01040649414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
118 (100.13580322266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
119 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
120 (545.02487182617): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 76057.910919189): 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 (168.80035400391): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
123 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
124 (!!!!! 1854.8965454102): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294770351 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294770351 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 1083724.0219116): ( 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 (107.0499420166): ( 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 (90.122222900391): 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 (45.061111450195): 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 (84.161758422852): 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 (48.87580871582): 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 (53.167343139648): 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 (42.915344238281): 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 (555.99212646484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (519.99092102051): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (332.83233642578): SELECT name FROM jos_deeppockets WHERE id=212
136 (36.954879760742): SELECT name FROM jos_deeppockets WHERE id=212
137 (538.11073303223): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (532.15026855469): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (103.95050048828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
140 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
141 (!!!!! 12358.18862915): TRUNCATE TABLE jos_trademed_module
142 (126.12342834473): 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=294770351 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (63.896179199219): 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=294770351 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (576.97296142578): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (108.00361633301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
147 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
148 (!!!!! 1505.1364898682): 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 (100.85105895996): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
150 (89.168548583984): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
151 (72.956085205078): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294770351 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294770351 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (588.89389038086): 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 (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)
154 (37.908554077148): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
156 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294770351 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294770351 AND published='1' LIMIT 1
157 (65.803527832031): select jos_twitters.link from jos_twitters where cat=10
158 (38.14697265625): select jos_facebook.link from jos_facebook where cat=10
159 (36.954879760742): select jos_google_plus.link from jos_google_plus where cat=10
160 (34.809112548828): select jos_linkedin.link from jos_linkedin where cat=10
161 (329.97131347656): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 1641.0350799561): insert into jos_banners_delta values (14615,'2025-06-19 10:40:07','216.73.216.120','view'),(14202,'2025-06-19 10:40:07','216.73.216.120','view'),(14203,'2025-06-19 10:40:07','216.73.216.120','view')