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Dr. Robert S. Ledley Developer of Full-Body CT Scanner, Dead at 86

By MedImaging International staff writers
Posted on 06 Aug 2012
The developer of the first computed tomography (CT) scanner capable of generating full body, cross-sectional images of the human body, Dr. Robert S. Ledley died July 24, 2012, in Kensington (MD, USA). He was 86 years old.

Dr. Ledley, a Georgetown University (Washington DC, USA) physicist and biotech researcher, first trained as a dentist and in the late 1950s, and he became an advocate for using data processors to help diagnose disease. In 1973, Dr. Ledley introduced one of the most significant diagnostic advancements that he called the automatic computed transverse axial scanner (ACTA). It was the first machine capable of generating cross-sectional images of any area of the body.

Dr. Ledley’s prototype did not include the contemporary unit’s tunnel--in his original prototype, the patient passed through a thinner ring-like scanner--but most CT scanners currently rely on his basic concept. CT technology, originally developed several years earlier by Nobel Prize-winning scientists Godfrey Hounsfield and Allan M. Cormack, changed the way medical imaging was practiced. Before the arrival of CT scans, doctors relied on X-ray images, which revealed only hard tissue such as bone.

Dr. Ledley’s machine began to become widely available in the mid-1970s and he was inducted into the US National Inventors Hall of Fame in 1990, and in 1997 received the National Medal of Technology. Dr. Ledley developed and built his original scanner in a basement laboratory at Georgetown University, with help from a local machinist and a final paint job by a nearby Cadillac car dealership. The machine was first used on a patient at the Georgetown University hospital, where a toddler was taken after falling off his bicycle and hitting his head. With the CT scanner, clinicians scanned his brain and found a blood clot that, unnoticed, might have killed the child.

In 1956, Dr. Ledley was hired as an assistant professor of electrical engineering at the Georgetown University. In 1974, Dr. Ledley formed the Digital Information Science Corp. (DISCO), selling the machines for USD 300,000 each.

Robert Steven Ledley was born June 28, 1926, in Flushing, Queens, NY, USA. Dr. Ledley received a DDS degree from New York University (New York, NY, USA) in 1948, while also studying physics at Columbia University (also in New York), where he received a Master’s degree in 1949. He worked and taught over the years at the US National Institute of Standards and Technology (NIST; Gaithersburg, MD, USA), where he used one of the early modern computers, as well as at Johns Hopkins University (Baltimore, MD, USA) and George Washington University (Washington DC, USA. He joined Georgetown in 1970 and retired in 2005.

Dr. Ledley had more than 20 patents and wrote one of the first comprehensive textbook for engineers on digital computer engineering. He also developed skid-resistant crutches. Moreover, Dr. Ledley was an early advocate of computer-based medical diagnostics, 50 years before medical residents began utilizing computers to type their patients’ symptoms into online programs.

The original prototype of the ACTA scanner is housed in the Smithsonian Institution (Washington DC, USA).

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92 (85.830688476562): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (52.928924560547): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (61.03515625): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (75.101852416992): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (64.849853515625): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (46.014785766602): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (56.028366088867): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (51.975250244141): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (55.074691772461): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (44.107437133789): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (60.081481933594): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (120.16296386719): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
107 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
108 (97.036361694336): 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=294741958 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (82.969665527344): 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=294741958 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
110 (128.98445129395): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
111 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
112 (97.990036010742): 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=294741958 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (638.00811767578): 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=294741958 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
114 (902.89115905762): 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
115 (578.88031005859): 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
116 (98.943710327148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
117 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
118 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
119 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
120 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
121 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
122 (60.796737670898): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
123 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
124 (243.9022064209): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 22931.098937988): 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 (597.95379638672): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294741958 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294741958 AND type='deeppockets_item' AND published='1' LIMIT 1
127 (!!!!! 9388.2083892822): ( 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
128 (227.92816162109): ( 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
129 (98.943710327148): 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
130 (55.074691772461): 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
131 (92.029571533203): 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
132 (49.829483032227): 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
133 (325.91819763184): 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
134 (56.028366088867): 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
135 (66.995620727539): 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
136 (61.988830566406): 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
137 (405.07316589355): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (252.96211242676): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (38.862228393555): SELECT name FROM jos_deeppockets WHERE id=211
140 (33.140182495117): SELECT name FROM jos_deeppockets WHERE id=211
141 (743.86596679688): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (591.99333190918): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (104.18891906738): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
144 (80.82389831543): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
145 (!!!!! 9635.9252929688): TRUNCATE TABLE jos_trademed_module
146 (137.0906829834): 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=294741958 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (78.916549682617): 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=294741958 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (737.90550231934): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (87.02278137207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
151 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
152 (!!!!! 1548.0518341064): 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 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
154 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
155 (40.054321289062): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294741958 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294741958 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (35.04753112793): 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)
157 (31.948089599609): 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)
158 (45.061111450195): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
160 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294741958 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294741958 AND published='1' LIMIT 1
161 (63.896179199219): select jos_twitters.link from jos_twitters where cat=10
162 (42.200088500977): select jos_facebook.link from jos_facebook where cat=10
163 (40.054321289062): select jos_google_plus.link from jos_google_plus where cat=10
164 (36.001205444336): select jos_linkedin.link from jos_linkedin where cat=10