Photoelectronic imaging and optical recording
The management of diagnostic images and patient records which at present is done by filing films and paper documents is subject to improvement. Especially, with the growing variety and intensity of use of digital imaging modalities the need for communication of images and for computer compatible mass storage has drastically increased.
The traditional film files have associated with them problems of slow access, loss of images, virtually no possibility for interaction with the stored information, large space requirements, and manual clerical work. The images made by digital modalities are archived by means of CRT hardcopy films and by recording the digital image data on magnetic tape and diskettes. This is done because the CRT camera cannot accurately represent the large contrast resolution available in the digital image data.
Moreover, the increasing number of digital imaging modalities necessitates integration and fast access to all the available diagnostic information of a patient during examination planning and treatment, which cannot be offered by existing filing systems.
Newly emerging optical disk systems more adequately perform archival storage because they offer large capacity random access, and have only a fraction of the media cost.
The digital optical recorder is a computer peripheral which stores 1000 M bytes of user data on each side of an optical disk with a diameter of 30 cm (12 inches). The user data rate of recording is in the range of 0.25 to 1 M byte/second. The bit error rate is better than 10–12, and the archival life is longer than 10 years. Taking into account the requirements of a 500 bed hospital a ten year image file is stored on about 3000 optical disks, occupying a small office room.
Realisation of a digital image management system requires interfaces to the image generating systems and to diagnostic viewing consoles.
Inclusion of large area radiographs is done by a high resolution film digitizer. Output of diagnostic images is done mostly on high-resolution CRT displays.
Elective hardcopy film output is provided by a computer compatible hardcopy unit.
These elements as well as the database architecture and transmission network demand a detailed study of performance requirements and system planning of the user interfaces. The concepts and solutions developed in the Picasso project (Picture Computation and Storage System) of the Philips’ Research Laboratories in Hamburg and in the Megadoc project of the Philips’ Research Laboratories in Eindhoven demonstrate the feasibility of diagnostic image management systems.
KeywordsOptical Disk Digital Modality Image Management Archival Storage Arithmetic Logic Unit
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