An efficient pre-object collimator based on an x-ray lens

A multiprism lens (MPL) is a refractive x-ray lens with one-dimensional focusing properties. If used as a pre-object collimator in a scanning system for medical x-ray imaging, it reduces the divergence of the radiation and improves on photon economy compared to a slit collimator. Potential advantage...

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Bibliographic Details
Published in:Medical physics (Lancaster) 2009-02, Vol.36 (2), p.626-633
Main Authors: Fredenberg, Erik, Cederström, Björn, Åslund, Magnus, Nillius, Peter, Danielsson, Mats
Format: Article
Language:English
Subjects:
acquisition time
Aluminium
biomedical imaging
BIOMEDICAL RADIOGRAPHY
collimation
Collimators
Engineering physics
FILTERS
FOCUSING
Fysiologi och farmakologi
Humans
Image sensors
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LENSES
Mammography
Mammography - instrumentation
Medical engineering
Medical imaging
Medical X‐ray imaging
MEDICIN
MEDICINE
Medicinsk teknik
Modulation transfer functions
multiprism lens
Optical physics
optical prisms
OPTICS
Optisk fysik
Other engineering physics
Other technology
PHOTONS
Physiology and pharmacology
Radiofysik
Radiography - instrumentation
Radiological physics
Radiological research
Radiologisk forskning
RADIOLOGY AND NUCLEAR MEDICINE
Reproducibility of Results
resolution
Scattering, Radiation
TECHNOLOGY
TEKNIKVETENSKAP
Teknisk fysik
TIME RESOLUTION
X RADIATION
x-ray flux
x-ray imaging
X-Rays
X‐ and γ‐ray instruments
X‐ray apparatus
X‐ray beams and x‐ray optics
X‐ray optics
Övrig teknisk fysik
Övriga teknikvetenskaper
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Description
Summary:A multiprism lens (MPL) is a refractive x-ray lens with one-dimensional focusing properties. If used as a pre-object collimator in a scanning system for medical x-ray imaging, it reduces the divergence of the radiation and improves on photon economy compared to a slit collimator. Potential advantages include shorter acquisition times, a reduced tube loading, or improved resolution. We present the first images acquired with a MPL in a prototype for a scanning mammography system. The lens showed a gain of flux of 1.32 compared to a slit collimator at equal resolution, or a gain in resolution of 1.31–1.44 at equal flux. We expect the gain of flux in a clinical setup with an optimized MPL and a custom-made absorption filter to reach 1.67, or 1.45–1.54 gain in resolution.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.3062926