Document Detail

Near monochromatic X-rays for digital slot-scan mammography: initial findings.
MedLine Citation:
PMID:  15232713     Owner:  NLM     Status:  MEDLINE    
X-ray spectra are composed of a broad bremsspectrum and anode-characteristic emission lines. In mammography typically molybdenum (Mo), rhodium (Rh) or tungsten (W) anodes are used in combination with Mo, Rh or aluminium filters. Only the photons with energies between 17 and 22 keV of the resulting spectrum are suitable for the soft tissue imaging needed for mammography. The aim of this article is to present first results obtained with a monochromator module mounted at the exit of the X-ray tube of a conventional clinical mammography unit. The experimental setup consists of a Siemens Mammomat 300, an X-ray monochromator module and a linear array detector for image acquisition. The technique is similar to the slot-scan technique known from digital mammography. The experimental machine allows to obtain images both with polychromatic and monochromatic X-rays. Initial evaluation of the system was performed by examination of a contrast-detail phantom (CD-MAM-phantom, Nijmegen, The Netherlands). Images done with the new monochromatic technique were compared to images of the phantom done with polychromatic spectra, with film-screen mammography as well as with digital mammography. The new technique with monochromatic slot-scan mammography resulted in correct identification of 93% of the phantom. Digital slot-scan mammography with polychromatic beam resulted in correct identification of 87%, digital full-field mammography in 83% and conventional film-screen mammography in 70% of the phantom. The results suggest that monochromatization has a potential for improving image quality or decreasing dose in X-ray mammography.
Felix Diekmann; S Diekmann; K Richter; U Bick; T Fischer; R Lawaczeck; W-R Press; K Schön; H-J Weinmann; V Arkadiev; A Bjeoumikhov; N Langhoff; J Rabe; P Roth; J Tilgner; R Wedell; M Krumrey; U Linke; G Ulm; B Hamm
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-06-30
Journal Detail:
Title:  European radiology     Volume:  14     ISSN:  0938-7994     ISO Abbreviation:  Eur Radiol     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-08-18     Completed Date:  2005-01-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9114774     Medline TA:  Eur Radiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1641-6     Citation Subset:  IM    
Department of Radiology, University Hospital Charité, Schumannstrasse 20/21, 10117 Berlin, Germany.
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MeSH Terms
Equipment Design
Mammography / instrumentation*
Phantoms, Imaging
Radiographic Image Enhancement / instrumentation*
Sensitivity and Specificity
Technology, Radiologic
X-Ray Intensifying Screens

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