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Virtual Ghost Imaging Enables Imaging Through Highly Adverse Conditions

By MedImaging International staff writers
Posted on 28 Feb 2012
Ghost imaging (GI) and virtual ghost imaging (VGI) technology seem to contradict traditional wisdom by being able to image an object by merely counting photons in a “light bucket.” This nonintuitive technique, however, can lead to better imaging when conditions are less than ideal.

In a first-of-its-kind demonstration, a team of researchers from the US Army Research Laboratory (Adelphi, MD, USA), and the University of Maryland Medical School (Baltimore, MD, USA), captured reflected photons from a highly specialized laser beam to create a VGI image of a remote target.

In the case of VGI, reflection does not refer to a mirror image of an object. Instead, it is merely the individual reflected photons of light that are counted with a single-pixel camera known as a light bucket. “Virtual ghost imaging is an amazing tool,” stated Ronald Meyers, a quantum physicist with the US Army Research Laboratory, in an article published February 6, 2012, in the American Institute of Physics’ journal Applied Physics Letters. “Because we are no longer bound by the need to collect spatial information--as is necessary in a typical camera--we can produce an image in some rather adverse and highly obscured conditions.”

In normal ghost imaging, harnessing information to make an image is a two-step process. First, the light source is analyzed, which could be the sun or a lamp, with a charge-coupled device (CCD) camera. Then a second detector is used, a light bucket, to count the reflected photons. By combining the data from the light source with the properties of the collected photons, an image can be created.

The idea to generating an image from photons that contain no spatial information lies in physics related to “entanglement,” a characteristic of light that Einstein described as “spooky action at a distance.” Through entanglement, photons can share a certain level of information. This property is already being developed for specialized communications and computers.

Virtual ghost imaging is a more self-contained and robust application of this phenomenon. For example, in VGI, one light source was a laser that produced a coherent beam of light known as a Bessel beam. Bessel beams, unlike normal laser beams, produce concentric-circle patterns. If a portion of the beam is blocked or obscured along its trajectory, the original pattern eventually reforms. “Bessel beams are self-healing and provide an important tool in virtual ghost imaging,” said Dr. Meyers. “Even after passing through distortions or a mask, the same well-defined ring shapes reemerge.” So long as enough photons make it to the target and back to the single-photon detector, it is possible to construct an image.

In their proof-of-concept demonstration, the researchers compared a Bessel beam’s VGI imaging capabilities with that of a normal Gaussian laser beam. Their target was the letters “ARL.” The light was then reflected back to the single pixel bucket detector. The researchers conducted this same test several times, placing different objects or an obscuring medium in the paths of the two light beams. In each case--whether passing through an offset aperture, cloudy water, or heat distortion--the Bessel beam reformed to produce a recognizable VGI image. The Gaussian beam produced a much less faithful image, and, in the case of the offset aperture, produced virtually no image at all.

“What this demonstrates is that by combining virtual ghost imaging with a highly diffraction-free coherent light source like a Bessel beam, it’s possible to probe through conditions that would normally thwart other imaging technologies,” Dr. Meyers noted.

According to the researchers, potential spin-offs of ghost imaging and virtual ghost imaging include applications in medical imaging, intelligence-surveillance-reconnaissance (ISR), and quantum computing.

Related Links:

US Army Research Laboratory
University of Maryland Medical School


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88 (72.956085205078): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294739493 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (39.100646972656): 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 (59.843063354492): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (43.153762817383): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (114.91775512695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
105 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
106 (81.062316894531): 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=294739493 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (65.088272094727): 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=294739493 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
109 (59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
110 (51.975250244141): 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=294739493 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (650.16746520996): 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=294739493 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (818.96781921387): 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 (611.0668182373): 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 (175.95291137695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
115 (85.830688476562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
116 (102.04315185547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
117 (109.91096496582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
118 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
119 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
120 (68.187713623047): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
121 (49.829483032227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
122 (427.0076751709): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 22409.915924072): 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 (610.1131439209): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294739493 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294739493 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (57.93571472168): ( 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 (42.915344238281): ( 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 (39.100646972656): 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 (34.093856811523): 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 (63.180923461914): 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 (30.994415283203): 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 (29.087066650391): 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 (29.087066650391): 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 (30.040740966797): 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 (33.855438232422): 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 (488.9965057373): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (352.85949707031): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (39.100646972656): SELECT name FROM jos_deeppockets WHERE id=215
138 (28.848648071289): SELECT name FROM jos_deeppockets WHERE id=215
139 (624.8950958252): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (616.07360839844): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (101.08947753906): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
142 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
143 (!!!!! 11631.011962891): TRUNCATE TABLE jos_trademed_module
144 (129.93812561035): 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=294739493 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (89.883804321289): 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=294739493 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (786.06605529785): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (120.87821960449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (133.03756713867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
149 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
150 (!!!!! 1563.0722045898): 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 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
152 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
153 (50.067901611328): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294739493 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294739493 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (42.915344238281): 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 (42.915344238281): 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)
156 (60.081481933594): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (95.129013061523): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
158 (69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739493 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739493 AND published='1' LIMIT 1
159 (60.796737670898): select jos_twitters.link from jos_twitters where cat=10
160 (45.061111450195): select jos_facebook.link from jos_facebook where cat=10
161 (43.153762817383): select jos_google_plus.link from jos_google_plus where cat=10
162 (39.100646972656): select jos_linkedin.link from jos_linkedin where cat=10
163 (308.03680419922): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14202,14203)
164 (!!!!! 1521.110534668): insert into jos_banners_delta values (14202,'2025-06-24 03:57:54','216.73.216.120','view'),(14203,'2025-06-24 03:57:54','216.73.216.120','view')