A method to remove the projection error in triple-energy radiography with contrast medium

Baldazzi, G.; Lanconelli, Nico; Masetti, Simone; Fiaschetti, M.; Maccagnani, M.; Roma, L.; Rossi, Pier Luca; Levi, G.; Sbarra, C.

doi:10.1016/j.nima.2009.05.079

Cited by 4 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The work reported that the extraction accuracy between the contrast agent, bone and tissue was improved by using triple-energy imaging [3]. In another study, triple-energy radiography was implemented with a contrast medium by using triple-energy quasi-monochromatic X-ray beams [4]. In this study, the authors used quasi-monochromatic X-ray by means of a Bragg monochromator coupled to the X-ray tube.…”

Section: Introductionmentioning

confidence: 99%

Experimental results of use of triple-energy X-ray beam with K-edge filter in multi-energy imaging

2016

View full text Add to dashboard Cite

Multi-energy imaging is useful for contrast enhancement of lesions, quantitative analysis of specific materials and material separation in the human body. Generally, dual-energy methods are applied to discriminating two materials, but this method cannot discriminate more than two materials. Photon-counting detectors provide spectral information from polyenergetic X-rays using multiple energy bins. In this work, we developed triple-energy X-ray beams using a filter with K-edge energy and applied them experimentally. The energy spectra of triple-energy X-ray beams were assessed by using a spectrometer. The designed triple-energy X-ray beams were validated by measuring quantitative evaluations with mean energy ratio (MER), contrast variation ratio (CVR) and exposure efficiency (EE). Then, triple-energy X-ray beams were used to extract density map of three materials, iodine (I), aluminum (Al) and polymethyl methacrylate (PMMA). The results of the thickness density maps obtained with the developed triple-energy X-ray beams were compared to those acquired using the photon-counting method. As a result, it was found experimentally that the proposed triple-energy X-ray beam technique can separate the three materials as well as the photon-counting method.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental results of use of triple-energy X-ray beam with K-edge filter in multi-energy imaging

2016

View full text Add to dashboard Cite

show abstract

“…The tomograph was entirely developed at the Departement of Physics of the University of Bologna and performs an innovative technology of radiology imaging using quasi-monochromatic X-rays beams [1]. Unfortunately, it is not yet available a source of monochromatic radiation sufficiently intense X-ray tube…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

Imaging characterization of a multi-energy CT with quasi-monochromatic X-ray source

Rossi

Andreani

Bollini³

et al. 2011

2011 IEEE Nuclear Science Symposium Conference Record

View full text Add to dashboard Cite

A new multi-energy computer tomographic system for small animals was developed -and is now operative -with a quasi-monochromatic X-ray source. The system brings together two important features: the possibility to scan small animal with quasi-monochromatic X-ray The triple-energy radiography reconstructs the contrast medium mass-thicknessTriple-energy radiography is an important technique, able to provide accurate estimations about the investigated materials. These information are determined by acquiring images of the analyzed object at three different energies. The triple-energy algorithm is here applied to reconstruct quantitatively the distribution of a contrast medium (Iodine) into the sample. The technique permits to remove completely the background signal from the image: the result is an image that contains only the signal of the Iodine. With respect to dual-energy techniques, the use of three energies is essential when the background has an inhomogeneous composition. For instance, if the background contains soft tissue and a layer of bone, the dual energy reconstructed signal of Iodine is significantly distorted. Adding the third energy, the projection errors are drastically reduced, and the accuracy of the signal much increased also to low concentration of Iodine. Hence, the removal of the projection error enables the quantitative imaging of Iodine. If we take the logarithm of the transmitted to incident photon flux ratio T = ln(N/N0), for the same sample at three different energies, we can generalize the Beer-Lambert attenuation law to the case of multiple beams. We can write:Where T is the collection of the logarithmic attenuation of the three beams, L is the set of mass thicknesses (product of density and thickness) of the basis materials, and A is a 3×3 matrix whose elements are , namely the mass-attenuation coefficients of the i-th material at the k-th energy. Solving the system for L, we obtain the image of Iodine L contrast medium, and the background projection over the two basis materials L1 and L2:

show abstract

X-ray beam design for multi-energy imaging with charge-integrating detector: A simulation study

Baek

Kim

2015

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

A method to remove the projection error in triple-energy radiography with contrast medium

Cited by 4 publications

References 4 publications

Experimental results of use of triple-energy X-ray beam with K-edge filter in multi-energy imaging

Experimental results of use of triple-energy X-ray beam with K-edge filter in multi-energy imaging

Imaging characterization of a multi-energy CT with quasi-monochromatic X-ray source

X-ray beam design for multi-energy imaging with charge-integrating detector: A simulation study

Contact Info

Product

Resources

About