Imaging with multi-prism x-ray lenses

Fredenberg, Erik,PhD,1979-KTH,Medicinsk bildfysik,Albanova VinnExcellence Center for Protein Technology, ProNova (författare)

QC 20210120
The multi-prism lens (MPL) is a refractive x-ray lens consisting of two rows of prisms facing each other at an angle. Rays entering the lens at the periphery will encounter a larger number of prisms than will central ones, hence experiencing a greater refraction. The focusing effect of the MPL can be used to gather radiation from a large aperture onto a smaller detector, and accordingly to make better use of the available x-ray flux in medical x-ray imaging. Potential advantages of a better photon economy include shorter acquisition times, a reduced tube loading, or an improved resolution. Since the focusing effect is one-dimensional it matches the design of scanning systems. In this study we present the first images acquired with an MPL instead of the pre-breast slit collimator in a scanning mammography system. According to the measurements, the MPL is able to increase the flux 32% at equal resolution compared to the slit collimator, or to improve the resolution 2.4 mm(-1) at equal flux. If used with a custom-made absorption filter in a clinical set-up, the gain of flux of the MPL is expected to be at least 45%, and the corresponding improvement in resolution to be 3 mm(-1).

Cederström, BjörnKTH,Medicinsk bildfysik,Albanova VinnExcellence Center for Protein Technology, ProNova(Swepub:kth)u1oerth9 (författare)
Åslund, Magnus (författare)
Nillius, PeterKTH,Medicinsk bildfysik,Albanova VinnExcellence Center for Protein Technology, ProNova(Swepub:kth)u1mhl6dq (författare)
Lundqvist, Mats (författare)
Danielsson, MatsKTH,Medicinsk bildfysik,Albanova VinnExcellence Center for Protein Technology, ProNova(Swepub:kth)u1m3qe0f (författare)
KTHMedicinsk bildfysik (creator_code:org_t)

Ingår i:Medical Imaging 2008 - Physics of Medical Imaging: SPIE, s. 91308-913089780819470973

Av författaren/redakt...: Fredenberg, Erik ...; Cederström, Björ ...; Åslund, Magnus; Nillius, Peter; Lundqvist, Mats; Danielsson, Mats

Om ämnet

MEDICIN OCH HÄLSOVETENSKAP: MEDICIN OCH HÄLS ...; och Medicinsk biotek ...; och Biomedicinsk lab ...

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