Abstract:
:The wide variation in absorber thickness characteristic of the posteroanterior projection of the chest routinely results in film underexposure and attendant suboptimal contrast in the mediastinal, retrocardiac, and diaphragmatic regions. We propose a special scanning system to deliver a more uniform film exposure over the image by modulating the intensity of a vertically oriented narrow fan (43 x 2 cm) of radiation, swept laterally across the patient's chest. Measurements of patient attenuation obtained with a detector placed behind the film cassette are used to adjust the x-ray tube output so as to maintain a constant film exposure during the course of the scan. The scan is completed in 5 seconds and results in images of significantly improved mediastinal penetration and contrast compared with those of conventional chest radiographs.
journal_name
Radiologyjournal_title
Radiologyauthors
Plewes DB,Wandtke JCdoi
10.1148/radiology.142.3.7063700subject
Has Abstractpub_date
1982-03-01 00:00:00pages
765-8issue
3eissn
0033-8419issn
1527-1315journal_volume
142pub_type
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