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Portable OCT Scanner Increases Access to Retinal Imaging

By MedImaging International staff writers
Posted on 11 Jul 2019
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Image: A portable OCT system costs less than one-tenth of commercial systems (Photo courtesy of Adam Wax/ Duke University).
Image: A portable OCT system costs less than one-tenth of commercial systems (Photo courtesy of Adam Wax/ Duke University).
A lightweight optical coherence tomography (OCT) scanner offers clinically accurate eye scans at a fraction of the cost.

Developed at Duke University (Durham NC, USA), the spectral-domain OCT system was designed using various cost-reduction techniques, including parts that cost less than a tenth of the retail price of commercial systems, and a housing made mostly from three dimensional (3D)-printed plastic sections. In addition, the spectrometer light path is designed to be circular, thus reducing expansions or contractions due to temperature changes, which occur symmetrically; as a result, the optical elements remain aligned. The device also uses a larger detector to make misalignments less likely.

The low-cost OCT system offers an axial resolution of 8.0 μm, a lateral resolution of 19.6 μm, and an imaging depth of 2.7 mm, for a total 6.6-mm field of view in the X and Y directions. In a proof of concept study, clinical imaging was performed on 120 eyes of 60 patients (60 eyes of normal volunteers and 60 eyes with retinal disease) using both the low-cost OCT and a Heidelberg Engineering Spectralis OCT system. Contrast-to-noise ratio (CNR) was measured from resulting images to determine system performance.

The results showed that the new OCT scanner produced images that were 95% as sharp as those taken by the Heidelberg Spectralis, with mean CNR value of low-cost OCT images only 5.6% lower than those of the Spectralis. The new OCT scanner also weighs 15 times less than the commercial system and is much smaller. The total fabrication costs were just USD 5,037, a tenth of the cost of the Spectralis. The results of the study were published on June 28, 2019, in Translational Vision Science & Technology.

“Right now OCT devices sit in their own room and require a PhD scientist to tweak them to get everything working just right. Ours can just sit on a shelf in the office and be taken down, used and put back without problems. We've scanned people in a Starbucks with it,” said senior author biomedical engineer Adam Wax, PhD. “With the growing number of cases of diabetic retinopathy in places like the United States, India and China, we hope we can save a lot of people's sight by drastically increasing access to this technology.”

OCT is the optical analogue of ultrasound; but because light is so much faster than sound, measuring time is more difficult. To time the light waves bouncing back from the tissue being scanned, OCT devices use a spectrometer to determine how much their phase has shifted compared to identical light waves that have traveled the same distance, but have not interacted with tissue. In use since the 1990s, OCT has become the standard of care for the diagnosis of retinal diseases, including macular degeneration, diabetic retinopathy and glaucoma.

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92 (27.179718017578): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294778612 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
93 (28.848648071289): 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`
94 (58.889389038086): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (44.107437133789): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (34.809112548828): SELECT show_live FROM jos_com_show_setting LIMIT 1
107 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
108 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
109 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
110 (50.067901611328): 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=294778612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (43.869018554688): 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=294778612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 1528.9783477783): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
113 (86.069107055664): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
114 (44.822692871094): 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=294778612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
115 (!!!!! 5439.9967193604): 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=294778612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
116 (551.93901062012): 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
117 (370.02563476562): 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
118 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
119 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
120 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
121 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
122 (38.862228393555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
123 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
124 (174.04556274414): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 87532.043457031): 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
126 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
127 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
128 (507.83157348633): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294778612 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294778612 AND type='deeppockets_item' AND published='1' LIMIT 1
129 (!!!!! 2200743.9136505): ( 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
130 (!!!!! 2074651.9565582): ( 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
131 (68.902969360352): 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
132 (32.186508178711): 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
133 (30.994415283203): 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
134 (28.133392333984): 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
135 (28.133392333984): 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
136 (27.179718017578): 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
137 (463.96255493164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (385.04600524902): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (40.054321289062): SELECT name FROM jos_deeppockets WHERE id=215
140 (32.901763916016): SELECT name FROM jos_deeppockets WHERE id=215
141 (484.94338989258): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (378.13186645508): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (!!!!! 4097.9385375977): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
144 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
145 (!!!!! 15481.948852539): TRUNCATE TABLE jos_trademed_module
146 (159.97886657715): 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=294778612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (570.05882263184): 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=294778612 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (!!!!! 3992.0806884766): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (117.06352233887): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
151 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
152 (!!!!! 1142.0249938965): 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
153 (113.96408081055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
154 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
155 (!!!!! 4504.919052124): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294778612 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294778612 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (67.949295043945): 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)
157 (30.994415283203): 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)
158 (30.040740966797): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (129.93812561035): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
160 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294778612 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294778612 AND published='1' LIMIT 1
161 (53.882598876953): select jos_twitters.link from jos_twitters where cat=10
162 (26.941299438477): select jos_facebook.link from jos_facebook where cat=10
163 (25.98762512207): select jos_google_plus.link from jos_google_plus where cat=10
164 (25.98762512207): select jos_linkedin.link from jos_linkedin where cat=10
165 (298.97689819336): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
166 (!!!!! 1734.0183258057): insert into jos_banners_delta values (14615,'2025-04-29 21:05:52','18.116.118.216','view'),(14202,'2025-04-29 21:05:52','18.116.118.216','view'),(14203,'2025-04-29 21:05:52','18.116.118.216','view')