National Biomedical Research Foundation. Georgetown University Search this
Extent:
3 Cubic feet
Type:
Collection descriptions
Archival materials
Manuals
Patents
Photographs
Design drawings
Correspondence
Articles
Diagrams
Slides (photographs)
Notes
Motion pictures (visual works)
Albums
Date:
1972-1990
Summary:
The Robert Ledley Papers document the development of the first whole-body diagnostic imaging system, the Automatic Computerized Transverse Axial (ACTA) X-ray Scanner by Ledley in 1973. Also included is material relating to Ledley's company, Digital Science Information Corporation (DISCO), as well as the public and medical communities' reactions to the scanner.
Scope and Contents:
The Robert Ledley Papers document the development of the Automatic Computerized Transverse Axial (ACTA) X-ray Scanner, Ledley's company Digital Science Information Corporation (DISCO), as well as the public and medical communities' reactions to the scanner. The collection is arranged into nine series.
Series 1, ACTA Scanner I Schematics, 1973-1975; Series 2, ACTA Scanner I [Computer and Electronics], 1973; and Series 3, ACTA Scanner Tomograph Mechanics, 1973-1974 document the development and design of the ACTA scanner through drawings, notes, memoranda, and product information. More detailed information about these materials is located in the control file. All oversize drawings have been moved to flat storage for preservation concerns.
Series 4, ACTA Scanner Operating Instructions, 1975, is the operating manual created for the scanner used in Ledley's Georgetown lab.
Series 5, ACTA Articles, Clippings, and Press Releases, 1973-1979, is comprised of the aforementioned materials relating to the ACTA Scanner. Newspaper clippings illuminate the public's perception of the scanner, and scientific pieces highlight the medical community's reaction. Ledley's published articles on the scanner and related topics are included.
Series 6, Digital Information Science Corporation (DISCO) material, 1973-1981, documents Ledley's career and his company. A biographical sketch, list of articles, textbooks, and patents highlight Ledley's achievements. Invoices, receipts, contracts, and correspondence illuminate the financial situation at DISCO and the relationship between the company and Pfizer.
Series 7, Computer manuals, 1972-1975, documents the computer systems and software that were used with the ACTA Scanner.
Series 8, Photographic material, 1973-1978, includes an album of photographs depicting the ACTA Scanner and images of the scans it created. This album was disassembled due to preservation concerns. This series also includes a collection of slides featuring the scanner and related equipment in use and images of the scans it created. A detailed description of each photograph and slide is included in the control file.
Series 9, ACTA Scanner film, [1974?], is a 16mm narrated film describing the creation of the scanner, its components, the way they work, the scanner in use, and images of the scans produced.
Arrangement:
This collection is arranged into nine series.
Series 1, ACTA Scanner I Schematics, 1973-1975
Series 2, ACTA Scanner I [Computer and Electronics], 1973
Series 3, ACTA Scanner Tomograph Mechanics, 1973-1974
Series 4, ACTA Scanner Operating Instructions, 1975
Series 5, ACTA Articles, Clippings, and Press Releases, 1973-1979
Series 6, Digital Information Science Corporation (DISCO) material, 1973-1981, undated
Series 7, Computer manuals, 1972-1975
Series 8, Photographic material 1973-1978
Subseries 1, Photographs, 19731978
Subseries 2, Slides, 1974
Series 9, ACTA Scanner film [1974?]
Biographical / Historical:
Robert Steven Ledley was born in Flushing Meadows, New York in 1926. He received a D.D.S. degree from New York University College in 1948. While attending dental school, he simultaneously studied at Columbia University; he earned a M.A. in Theoretical Physics in 1949. He volunteered for the army and was sent to the U.S. Army Medical Field Service School in Fort Sam Houston, Texas.1 After completing his service, Ledley held a wide variety of research and academic positions in physics, electrical engineering, and medicine.
Ledley was a physicist within the External Control Group of the Electronic Computer Laboratory of the National Bureau of Standards from 1953-1954. He was an operations research analyst within the Strategic Division of the Operations Research Office at Johns Hopkins University from 1954-1956. Ledley went on to become an associate professor in the Department of Electrical Engineering at The George Washington University from 1956-1960 while also serving as a consultant mathematician at the National Bureau of Standards Data Processing Systems Division, 1957-1960. At this time, Ledley also worked part time at the National Research Council's National Academy of Sciences from 1957-1961. Ledley became the president of the National Biomedical Research Foundation in 1960, a position he still holds today. He was an instructor of pediatrics at the Johns Hopkins University School of Medicine from 1960-1963. He returned to The George Washington University's Department of Electrical Engineering in 1968 where he was a professor until 1970. He then became a professor in the Department of Physiology and Biophysics at the Georgetown University School of Medicine in 1970. In 1974, Ledley also became a professor in the Radiology Department at the Georgetown University Medical Center. In 1975, he became the director of the Medical Computing and Biophysics Division at Georgetown University Medical Center.
In 1972, the British company Electric and Musical Industries Limited (EMI) released a medical imaging machine for use on smaller areas of the body that were positioned under a water tank. In 1973, Ledley developed the Automatic Computerized Transverse Axial (ACTA) X-ray Scanner (US Patent #3,922,552). This machine was a whole-body diagnostic medical imaging system. He was awarded a grant from the National Institutes of Health for an engineering equipment project, but the money was never received due to budget cuts. Ledley looked elsewhere for funding. He consulted with Georgetown staff and discovered a neurosurgeon had asked to buy a head scanning machine from EMI. Ledley did not think the images in EMI's brochure appeared clear, and he offered to create a similar machine for half the price. Georgetown agreed to fund this project for $250,000. Ledley secured the services of a machinist at a local machine shop, an electronic engineer, and a programmer/mathematician to assist in the project.2 The ACTA Scanner debuted in February, 1974 and did not require the use of a water tank.
Following the creation of the ACTA Scanner, Ledley organized Digital Information Science Corporation (DISCO) in order to manufacture the system. DISCO began producing scanners as orders were received. Due to financial constraints, DISCO was forced to request $100,000 upon receipt of the order, $100,000 when the scanner was halfway completed, and the final $100,000 payment upon delivery3. In 1975, Pfizer purchased the rights to manufacture the ACTA Scanner from DISCO for $1.5 million.
Ledley is a Fellow of the American Association for the Advancement of Science and a senior member of the Institute of Electrical and Electronics Engineers. He has earned numerous awards and honors for his work. In 1997, he received the National Medal of Technology from President William Jefferson Clinton for his pioneering work on the whole-body CT diagnostic X-ray scanner. He also founded the Pattern Recognition Society and Computerized Tomography Society.
Sources
1 Ash, J., D. Sittig, and R. Ledley. "The Story Behind the Development of the First Whole-body Computerized Tomography Scanner as Told by Robert S. Ledley." Journal of the American Medical Informatics Association, 2006 Sep-Oct (2006), 465-469, http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1561796. (accessed June 24, 2009).
2 Ibid.
3 Ibid.
Separated Materials:
An ACTA Scanner and numerous accessories were donated to the Division of Medicine and Science in 1984.
Provenance:
This collection was donated by Robert S. Ledley on September 18, 1984.
Restrictions:
The collection is open for research.
Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection is open for research. Access to collection materials requires an appointment.
Collection Rights:
The NMAAHC Archives can provide reproductions of some materials for research and educational use. Copyright and right to publicity restrictions apply and limit reproduction for other purposes.
Collection Citation:
Norma Merrick Sklarek Archival Collection, 1944-2008. National Museum of African American History and Culture, Smithsonian Institution.
Rathbun's forensic case files donated in 2013 are restricted until 2088. Two folders containing student grades have been separated and are restricted until 2055. For preservation reasons, his computer disks have been separated and restricted. Please note that the collection contains images of human remains.
Collection Rights:
Contact the repository for terms of use
Collection Citation:
Ted Allan Rathbun papers, National Anthropological Archives, Smithsonian Institution
Rathbun's forensic case files donated in 2013 are restricted until 2088. Two folders containing student grades have been separated and are restricted until 2055. For preservation reasons, his computer disks have been separated and restricted. Please note that the collection contains images of human remains.
Collection Rights:
Contact the repository for terms of use
Collection Citation:
Ted Allan Rathbun papers, National Anthropological Archives, Smithsonian Institution
The Silhouette Sign; Location of Intrathoracic Lesions
Collection Creator:
National Museum of American History (U.S.). Division of Medical Sciences Search this
National Museum of American History (U.S.). Division of Medical Sciences Search this
Container:
Item RF8 222.21
Type:
Archival materials
Scope and Contents:
Film Planning and Production under Direction of the Exhibits and Audio-Visual Promotion Department and Medical Communications Division, Eli Lilly and Company, by the Lowe Company ; by Benjamin Felson, M.D., Chairman and Professor, Department of Radiology, University of Cincinnati, undated, 1 reel (30 min.) : sd., col. ; 16mm. positive. Listed in previous Medical Sciences Film Catalogue (and can label?) as "Location of Interthoracic Lesions.
Accompanying material states: The film is set in a classroom, where Dr. Felson, with the help of models and x-ray films, discusses the fundamentals of radiology. He shows the effect of various substances (air, tissue, bone) on x-rays and uses these facts to explain the silhouette sign. With radiographs of actual cases, Dr. Felson demonstrates the value of silhouette sign as a means of determining the presence, location, and extent of intrathoracic lesions. The unique features of the film are its classroom atmosphere and the quiz sessions, which allow audience participation.
Collection Restrictions:
Collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning copyright restrictions. Other intellectual property rights may apply. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Medical Sciences Film Collection, circa 1930s-1960s, Archives Center, National Museum of American History
United States. National Aeronautics and Space Administration Search this
Container:
Box 4, Folder 4
Type:
Archival materials
Date:
1972-1975
Restrictions:
Some health-related materials in Series 3: Medical Publications are restricted until 2034.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning copyright restrictions. Other intellectual property rights may apply. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
David Vetter Collection, Archives Center, National Museum of American History.
This collection is open for research. Access to original papers requires an appointment and is limited to the Archives' Washington, D.C. Research Center.
Collection Rights:
The Archives of American Art makes its archival collections available for non-commercial, educational and personal use unless restricted by copyright and/or donor restrictions, including but not limited to access and publication restrictions. AAA makes no representations concerning such rights and restrictions and it is the user's responsibility to determine whether rights or restrictions exist and to obtain any necessary permission to access, use, reproduce and publish the collections. Please refer to the Smithsonian's Terms of Use for additional information.
Collection Citation:
Mel Casas papers, 1963-1998. Archives of American Art, Smithsonian Institution.
Sponsor:
The processing and digitization of this collection received Federal support from the Latino Initiatives Pool, administered by the Smithsonian Latino Center. Additional funding for the digitization of the papers was provided by the Roy Lichtenstein Foundation.
Use of original papers requires an appointment and is limited to the Archives' Washington, D.C., Research Center.
Collection Rights:
The Archives of American Art makes its archival collections available for non-commercial, educational and personal use unless restricted by copyright and/or donor restrictions, including but not limited to access and publication restrictions. AAA makes no representations concerning such rights and restrictions and it is the user's responsibility to determine whether rights or restrictions exist and to obtain any necessary permission to access, use, reproduce and publish the collections. Please refer to the Smithsonian's Terms of Use for additional information.
Collection Citation:
Rupert Scott Lovejoy papers, 1904-1979. Archives of American Art, Smithsonian Institution.
Sponsor:
Glass plate negatives in this collection were digitized in 2019 with funding provided by the Smithsonian Women's Committee.
Pezzati, Pietro, 1902-1993 -- Photographs Search this
Robbins, Laurence L., 1911-1980 -- Photographs Search this
Extent:
26 Items (photographic prints, b&w, 26 x 21 cm.)
Type:
Collection descriptions
Archival materials
Date:
circa 1971
Scope and Contents:
Photographs document the work in progress of Pezzati's portrait of Laurence L. Robbins, chief of Radiology, Harvard Medical School, taken by Robbins' colleague Jack R. Dreyfuss. Included are 11 of Robbins in Pezzati's studio, sitting for the portrait, and 14 of the portrait in progress, all taken by Dreyfuss. Also included is one color photo of the finished work, taken by Boris of Boston.
Collection is open for research but is stored off-site and special arrangements must be made to work with it. Contact the Archives Center for information at archivescenter@si.edu or 202-633-3270.
Collection Rights:
Copyright held by donor and/or heirs. Collection items available for reproduction, but the Archives Center makes no guarantees concerning copyright restrictions. Reproduction permission from Archives Center: fees for commercial use.] .
Collection Citation:
The Computer World Smithsonian Awards, Archives Center, National Museum of American History
Collection is open for research but is stored off-site and special arrangements must be made to work with it. Contact the Archives Center for information at archivescenter@si.edu or 202-633-3270.
Collection Rights:
Copyright held by donor and/or heirs. Collection items available for reproduction, but the Archives Center makes no guarantees concerning copyright restrictions. Reproduction permission from Archives Center: fees for commercial use.] .
Collection Citation:
The Computer World Smithsonian Awards, Archives Center, National Museum of American History
Material is subject to Smithsonian Terms of Use. Should you wish to use NASM material in any medium, please submit an Application for Permission to Reproduce NASM Material, available at Permissions Requests.
Collection Citation:
Benjamin O. Davis, Jr. Collection, Acc. 1992.0023, National Air and Space Museum, Smithsonian Institution.
