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X-Ray Phase Tomography with Synchrotron Radiation Offers Better Contrast Than CT Imaging

By MedImaging International staff writers
Posted on 03 Nov 2014
X-ray phase tomography is an imaging technique that uses penetrating X-rays to create volumetric views through slices of soft biologic tissues, such as tumors, and it offers strongly enhanced contrast in comparison to conventional computed tomography (CT) scans. However, scientists still do not know which X-ray phase tomography methods are best suited to yield optimized results for a wide variety of conditions.

To answer this question, a large group of researchers in Europe set out to compare three different X-ray phase tomography methods at the European Synchrotron Radiation Facility’s (ESRF; Grenoble, France) beamline ID19—X-ray grating interferometry, propagation-based phase tomography with single-distance phase reconstruction, and holotomography.

Led by Dr. Irene Zanette, a scientist affiliated with both ESRF and the Technische Universität München (TUM; Germany), the researchers put these three techniques to the test by examining cancerous tissue from a mouse model and an entire rat’s heart, which they reported in October 2014 in the Journal of Applied Physics.

Along with colleagues Bert Müller, group leader of the Biomaterials Science Center (Basel, Switzerland) and Timm Weitkamp, a scientist from the Synchrotron SOLEIL (Saint-Aubin, France), the team explored which technology performs best in terms of spatial resolution and visualization/quantification of pertinent features in the samples. They also examined other related factors such as the simplicity of the setup, and the data acquisition and analysis involved in each method. To accomplish this, the researchers chose standard synchrotron radiation, which produces substantially higher-quality X-rays than standard X-ray generators, such as those found in hospitals.

“Think of synchrotron radiation as being analogous to the sort of monochromatic, collimated and intense light produced by lasers, while conventional X-ray generators in hospitals are more analogous to light bulbs we use within our homes,” explained Dr. Zanette, currently a postdoctoral scientist in biomedical physics at TUM.

Significantly, she pointed out, while their study was performed using synchrotron radiation, the same techniques are amenable to both polychromatic and divergent beams and can also be implemented at conventional X-ray sources. The researchers used an advanced X-ray technique known as phase-contrast imaging. This type of imaging works by making the X-ray beam interfere while it propagates from sample to detector, according to Dr. Zanette. “This interference is fundamental because it encodes precious information on the phase of the X-ray waves.”

By comparison, conventional X-ray imaging, of the sort performed at hospitals and airports, doesn't use phase information. Rather, it relies only on the attenuation of the amplitude (reduction in intensity) of the X-ray waves by the object under study to generate image contrast. “More detailed information is contained in the phase than the amplitude, so it enables us to obtain images with much greater contrast and clearly differentiates cancerous tissue from healthy tissue,” Dr. Zanette said.

By comparing these methods, the group was able to show that for each specimen, the spatial resolution derived from the characteristic morphologic features is about twice as good for holotomography and single-distance phase reconstruction compared to X-ray grating interferometry. They also found that X-ray grating interferometry data generally provide much better contrast-to-noise ratios for anatomic features, excel in fidelity of the density measurements, and are more robust against low-frequency artifacts than holotomography.

The group regards all three of the phase tomography methods as being complementary. “The application determines which spatial and density resolutions are desired for the imaging task and dose requirements, so it really comes down to a choice between the complexity of the experimental setup and the data processing,” noted Dr. Müller. “It’s important to choose the ideal technique for your specific purposes.”

Since synchrotron radiation is of higher quality than the radiation at conventional sources, measurements at synchrotrons represent benchmarking experiments when translating these tomography techniques to clinical practice-especially X-ray grating interferometry, which is gaining popularity for use in hospitals.

“Our research should help provide guidance for other researchers in developing an ideal phase-contrast imaging method, which will be adopted by hospitals in the future,” Dr. Zanette concluded.

Related Links:

European Synchrotron Radiation Facility
Technische Universität München


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89 (34.093856811523): 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 (329.01763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (957.96585083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (311.13624572754): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (243.9022064209): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (!!!!! 1238.8229370117): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (278.94973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (66.995620727539): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (50.067901611328): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (!!!!! 2808.0940246582): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (76.055526733398): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (48.87580871582): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (80.108642578125): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (54.836273193359): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (117.06352233887): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
105 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
106 (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 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=294755463 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (53.882598876953): 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=294755463 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 1036.8824005127): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
109 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
110 (377.89344787598): 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=294755463 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 2425.9090423584): 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=294755463 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (639.20021057129): 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 (!!!!! 2799.9877929688): 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 (!!!!! 3236.0553741455): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
115 (125.88500976562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
116 (143.05114746094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
117 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
118 (81.777572631836): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
119 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
120 (167.1314239502): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
121 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
122 (532.86552429199): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 56300.87852478): 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 (725.03089904785): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294755463 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294755463 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 18518.924713135): ( 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 (159.02519226074): ( 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 (173.09188842773): 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 (56.028366088867): 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 (76.055526733398): 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 (44.107437133789): 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 (!!!!! 2622.127532959): 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 (84.161758422852): 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 (53.882598876953): 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 (38.14697265625): 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 (!!!!! 1343.9655303955): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (550.98533630371): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (611.0668182373): SELECT name FROM jos_deeppockets WHERE id=211
138 (45.061111450195): SELECT name FROM jos_deeppockets WHERE id=211
139 (767.94624328613): 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 '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (542.87910461426): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (641.1075592041): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
142 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
143 (!!!!! 16454.935073853): TRUNCATE TABLE jos_trademed_module
144 (103.95050048828): 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=294755463 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (688.07601928711): 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=294755463 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (485.89706420898): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (79.154968261719): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (79.154968261719): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
149 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
150 (!!!!! 1389.9803161621): 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 (219.10667419434): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
152 (96.08268737793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
153 (77.009201049805): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294755463 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294755463 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (52.928924560547): 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=211 or channel_id is null)
155 (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=211 or channel_id is null)
156 (76.055526733398): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (216.00723266602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
158 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755463 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755463 AND published='1' LIMIT 1
159 (84.877014160156): select jos_twitters.link from jos_twitters where cat=10
160 (49.114227294922): select jos_facebook.link from jos_facebook where cat=10
161 (44.822692871094): select jos_google_plus.link from jos_google_plus where cat=10
162 (45.061111450195): select jos_linkedin.link from jos_linkedin where cat=10