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Proceedings Paper

Method for the determination of the modulation transfer function (MTF) in 3D x-ray imaging systems with focus on correction for finite extent of test objects
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Paper Abstract

It is well known that rotational C-arm systems are capable of providing 3D tomographic X-ray images with much higher spatial resolution than conventional CT systems. Using flat X-ray detectors, the pixel size of the detector typically is in the range of the size of the test objects. Therefore, the finite extent of the "point" source cannot be neglected for the determination of the MTF. A practical algorithm has been developed that includes bias estimation and subtraction, averaging in the spatial domain, and correction for the frequency content of the imaged bead or wire. Using this algorithm, the wire and the bead method are analyzed for flat detector based 3D X-ray systems with the use of standard CT performance phantoms. Results on both experimental and simulated data are presented. It is found that the approximation of applying the analysis of the wire method to a bead measurement is justified within 3% accuracy up to the first zero of the MTF.

Paper Details

Date Published: 19 March 2007
PDF: 10 pages
Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65104Q (19 March 2007); doi: 10.1117/12.708924
Show Author Affiliations
Dirk Schäfer, Philips Research Europe (Germany)
Jens Wiegert, Philips Research Europe (Germany)
Matthias Bertram, Philips Research Europe (Germany)


Published in SPIE Proceedings Vol. 6510:
Medical Imaging 2007: Physics of Medical Imaging
Jiang Hsieh; Michael J. Flynn, Editor(s)

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