Radiographic mottle and patient exposure in mammography
Radiographic mottle has been analyzed in mammography using a comprehensive theory that takes into account fluctuations in absorbed x-ray energy and in phosphor light-photon yield, as well as film granularity and random variations in phosphor coating. Density fluctuations, signal-to-noise ratios, and quantum-efficiencies are presented for two screen/film systems as functions of density and viewing-aperture size. For sampling apertures of less than 500 ..mu..m in diameter, film granularity is the dominant source of noise for a Kodak Min-R screen/film system. This implies that quantum mottle can be increased and patient exposure reduced with little or no loss in imaged information. Such is the case for the second combination, a Min-R screen combined with Ortho-M film.
- Research Organization:
- Univ. of Alabama, Birmingham
- OSTI ID:
- 6189891
- Journal Information:
- Radiology; (United States), Journal Name: Radiology; (United States) Vol. 145:3; ISSN RADLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
62 RADIOLOGY AND NUCLEAR MEDICINE
BIOMEDICAL RADIOGRAPHY
BODY
DENSITY
DIAGNOSTIC TECHNIQUES
DOSES
EQUIPMENT
GLANDS
IMAGES
INDUSTRIAL RADIOGRAPHY
MAMMARY GLANDS
MEDICINE
NUCLEAR MEDICINE
ORGANS
PATIENTS
PHOTOGRAPHIC FILMS
PHYSICAL PROPERTIES
RADIATION DOSES
RADIOLOGY
SIGNAL-TO-NOISE RATIO
SPECTRA
X-RAY EQUIPMENT
X-RAY RADIOGRAPHY
X-RAY SPECTRA