Radiation dose efficiency comparison between differential phase contrast CT and conventional absorption CT.

Medical Physics
Joseph ZambelliGuang-Hong Chen

Abstract

The superior radiation dose efficiency of a newly implemented differential phase contrast CT imaging method compared to the conventional absorption CT method is demonstrated. A differential phase contrast CT imaging method has recently been implemented using conventional x-ray sources with a grating interferometer consisting of three gratings. This approach offers the possibility of simultaneous reconstruction of both attenuation contrast and phase contrast images from a single acquisition. This enables a direct comparison of radiation dose efficiency of both types of reconstructed images under identical conditions. Radiation dose efficiency was studied by measuring the change in contrast-to-noise ratio (CNR) with different exposure levels. A physical phantom of 28.5 mm diameter was constructed and used for measurement of CNR in both the absorption and phase contrast CT images, which were reconstructed from the same data set. For three of the four materials studied, at any given exposure level, the CNR of the differential phase contrast CT images was superior to that of the corresponding absorption contrast CT images. The most dramatic improvement was noted in the contrast between PMMA and water, where the CNR was improved by a...Continue Reading

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Citations

Apr 12, 2012·Physics in Medicine and Biology·Pascal Thériault LauzierGuang-Hong Chen
Sep 7, 2013·Medical Physics·A OlivoR D Speller
Jul 1, 2011·Medical Physics·Thomas KöhlerEwald Roessl
Jul 2, 2015·Medical Physics·Thomas WeberGisela Anton
Dec 12, 2012·Physics in Medicine and Biology·Alberto BravinPekka Suortti
Aug 6, 2013·Physics in Medicine and Biology·Ge Wang, Hengyong Yu
Jun 29, 2012·Biomedical Optics Express·Dieter HahnFranz Pfeiffer
Jun 8, 2012·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·W CongG Wang
Feb 22, 2014·Physics in Medicine and Biology·Magdalena B SzafraniecAlessandro Olivo
Mar 16, 2011·Physics in Medicine and Biology·Rainer Raupach, Thomas G Flohr
Nov 26, 2015·Biomedical Optics Express·Bartłomiej Włodarczyk, Jakub Pietrzak
Feb 3, 2016·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Jianheng HuangHanben Niu

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