Signal evaluation of a novel dual-energy multimedia imaging sensor

Giakos, G.C.; Chowdhury, S.; Shah, Nazar Abbas; Mehta, Kurang; Sumrain, S.; Passerini, A.; Patnekar, N.; Evans, Edward A.; Fraiwan, Luay; Ugweje, Okechukwu C.; Nemer, R.

doi:10.1109/tim.2002.806036

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…Dualenergy methods make use of two sets of data attained for different x-ray spectra. This can be accomplished by either scanning twice with different source voltages, or by using two different x-ray energy windows to collect the data (Giakos et al 2002). Broadly speaking, dualenergy methods are classified into two categories: post-reconstruction and pre-reconstruction methods.…”

Section: Dual-energy Theorymentioning

confidence: 99%

“…These issues are certainly important for medical application of helical, cone-beam CT, yet so far these algorithms have been applied to simulated data that model acquisition with a monochromatic x-ray source. It is clear that the reconstructed images will in general be degraded due to physical factors such as beam-hardening (Sidky et al 2003); however, further development in detector technology may allow for some energy resolving capability by simultaneously detecting x-rays in two different energy windows (Giakos et al 2002). Such an advance would make even more efficient use of the x-ray dose, which patients are subjected to, for extracting diagnostic information by employing dual-energy methods.…”

Section: Introductionmentioning

confidence: 99%

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Impact of polychromatic x-ray sources on helical, cone-beam computed tomography and dual-energy methods

2004

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Recently, there has been much work devoted to developing accurate and efficient algorithms for image reconstruction in helical, cone-beam computed tomography (CT). Little attention, however, has been directed to the effect of physical factors on helical, cone-beam CT image reconstruction. This work investigates the effect of polychromatic x-rays on image reconstruction in helical, cone-beam computed tomography. A pre-reconstruction dual-energy technique is developed to reduce beam-hardening artefacts and enhance contrast in soft tissue.

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Section: Dual-energy Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of polychromatic x-ray sources on helical, cone-beam computed tomography and dual-energy methods

2004

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Dual-energy technique at low tube voltages for small animal imaging

Cho

Sidky

Bian

et al. 2010

Tinshhua Sci. Technol.

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We investigate the feasibility of dual-energy method for image contrast enhancement in small animal studies using a low kV X-ray radiographic system. A robust method for X-ray spectrum estimation from transmission measurements, based on expectation-maximization (EM) method, is applied to an X-ray specimen radiographic system for dual energy imaging of a mouse. From transmission measurements of two known attenuators at two different X-ray tube voltages, the X-ray energy spectra are reconstructed using the EM-based method. From the spectra information thus obtained, the transmission data for bone and soft tissue in terms of various thicknesses are generated. Two polynomial functions of transmission data are then sought for to fit the inverted thicknesses of bone and soft-tissue. Scatters in cone-beam projection data acquired at two X-ray energies were corrected. From the scatter-corrected data, a bone thickness map is separated from a soft-tissue thickness map by use of the polynomial functions.

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