Wuppertal 2015 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 2: Biomedical Imaging II
ST 2.8: Vortrag
Montag, 9. März 2015, 18:30–18:45, BZ.08.02 (HS 3)
Reduction of motion artifacts in digital radiography — •Katharina Loot1,2 and Andreas Block1 — 1Klinium Dortmund, Germany — 2Heinrich Heine University Düsseldorf, Germany
During the image acquisition in digital radiography, the patient is asked to remain immobile and refrain from breathing. This minimizes motion artifacts from limb movements or breathing-induced movement of inner organs and thus optimizes the image quality. Patient groups which are unable to control their breathing or limb movements (patients in intensive care or suffering from Parkinson disease, infants, etc.) may need a second image acquisition, connected with additional radiation exposure.
To avoid this, motion-blurred images can be computationally restored, provided there exists sufficient information about the direction and the velocity of the motion. This information can be obtained by motion tracking or estimation of approximate values. Several reconstruction algorithms known from digital photography can then be implemented for use with digital radiographs.
Our evaluation method uses simple phantoms for quality assurance to quantify the image enhancement. The results show a significant increase in image quality for the restored radiographs. Contrast and spatial resolution before and after the restoration were compared by analysis of the modulation transfer function. We show that the restoration returns satisfactory results even when the characteristics of the motion are only approximately known. In addition, we present restoration examples for radiographs of anthropomorphic phantoms.