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Träfflista för sökning "(hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Medicinteknik) hsv:(Medicinsk laboratorie och mätteknik)) pers:(Åslund Magnus) srt2:(2007)"

Sökning: (hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Medicinteknik) hsv:(Medicinsk laboratorie och mätteknik)) pers:(Åslund Magnus) > (2007)

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1.
  • Åslund, Magnus, et al. (författare)
  • Physical characterization of a scanning photon counting digital mammography system based on Si-strip detectors
  • 2007
  • Ingår i: Medical physics (Lancaster). - : Wiley. - 0094-2405. ; 34:6, s. 1918-1925
  • Tidskriftsartikel (refereegranskat)abstract
    • The physical performance of a scanning multislit full field digital mammography system was determined using basic image quality parameters. The system employs a direct detection detector comprised of linear silicon strip sensors in an edge-on geometry connected to photon counting electronics. The pixel size is 50 mu m and the field of view 24 x 26 cm(2). The performance was quantified using the presampled modulation transfer function, the normalized noise power spectrum and the detective quantum efficiency (DQE). Compared to conventional DQE methods, the scanning geometry with its intrinsic scatter rejection poses additional requirements on the measurement setup, which are investigated in this work. The DQE of the photon counting system was found to be independent of the dose level to the detector in the 7.6-206 mu Gy range. The peak DQE was 72% and 73% in the scan and slit direction, respectively, measured with a 28 kV W-0.5 mm Al anodefilter combination with an added 2 mm Al filtration.
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2.
  • Åslund, Magnus, et al. (författare)
  • Spectral shaping for photon counting digital mammography
  • 2007
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 580:2, s. 1046-1049
  • Tidskriftsartikel (refereegranskat)abstract
    • The spectral shaping properties of conventional filters have been evaluated for a photon counting digital mammography system, and the result has been compared with the theoretical spectrum from a multi-prism X-ray lens (MPL). The absorption filters and the MPL were evaluated using a theoretical model of the system which has been verified experimentally. The spectral shaping performance is quantified with the spectral quantum efficiency (SQE), calculated as the polychromatic signal-difference-to-noise ratio (SDNR) squared over the optimal monochromatic SDNR squared at the same average glandular dose. The MPL increases the SQE by 25% compared to the investigated absorption filter when compared with a Tungsten anode. This translates into a potential dose reduction of 20% at maintained SDNR.
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  • Resultat 1-2 av 2
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Danielsson, Mats (2)
Cederström, Björn (2)
Åslund, Magnus (2)
Lundqvist, Mats (1)
Fredenberg, Erik, Ph ... (1)
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