Resolution of Field-Emission X-Ray Sources

Autor:	Walter P. Dyke, Francis M. Charbonnier, John P. Barbour
Rok vydání:	1975
Předmět:	business.industry Resolution (electron density) Field of view Field electron emission Optics Optical transfer function Medicine Radiology Nuclear Medicine and imaging Focal Spot Size Axial symmetry business Technology Radiologic Intensity (heat transfer) Line Spread Function
Zdroj:	Radiology. 117:165-172
ISSN:	1527-1315 0033-8419
DOI:	10.1148/117.1.165
Popis:	The physical designs of field-emission and conventional x-ray tubes are compared, and the physical and geometric source properties are translated into optical and resolution characteristics using modulation transfer functions calculated for idealized and practical sources and verified by star test pattern measurements. The field-emission design has several advantages: axial symmetry, circular shape, and a relatively favorable intensity distribution of the focal spot; in addition, the focal spot size is independent of the tube current. These advantages greatly enhance uniformity over the field of view and may increase resolution by a factor of 2 for a given nominal source size, thus largely ofsetting the greater physical size of present field-emission sources.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db0b419598b6297fe6f4f2e687792db6 https://doi.org/10.1148/117.1.165 Zobrazit plný text záznamu