Performance characteristics of a dual‐energy detector for digital scan projection radiography

Morgan, Douglas R.; Sones, R. A.; Barnes, Gary T.

doi:10.1118/1.596047

Cited by 13 publications

(7 citation statements)

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“…Fundamental differences in x-ray attenuation phenomena, such as photon-electric absorption versus scattering, can be leveraged. Investigators have also looked into the potential of narrow-beam approaches for dual-energy chest imaging [10][11][12][13][14][15] . Barnes et al and Morgan et al report on the performance characteristics of a sandwiched pair of x-ray intensifying screens in scanned radiography 11,12 .…”

Section: Introductionmentioning

confidence: 99%

“…Investigators have also looked into the potential of narrow-beam approaches for dual-energy chest imaging [10][11][12][13][14][15] . Barnes et al and Morgan et al report on the performance characteristics of a sandwiched pair of x-ray intensifying screens in scanned radiography 11,12 . Brody et al research the use of a CT in a "scout-mode" approach 13 and Nudelman describes a slot-scanning design with an image-intensifier 14 .…”

Section: Introductionmentioning

confidence: 99%

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Multispectral single-scan lung imaging system: initial feasibility

Besson

Crocker

2006

SPIE Proceedings

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This paper describes a system for multi-spectral single-scan lung imaging. The proposed approach relies on a low noise detector sampled at a high rate. The proposed method overcomes limitations of CCD time-and-delay integration slot-scanning systems. The system design and preliminary specifications are described. The results of initial spectral and system simulations in support of system feasibility per the outlined specifications are described. Initial investigations support the potential of the proposed approach to alleviate four shortcomings of the current digital flat-panel approach to chest radiography: (i) by enabling dynamic multi-spectral imaging in a single scan, the approach reduces the time delay between exposures, thus reducing sensitivity to motion; (ii) the approach enables dynamic technique feedback and technique adaptation, eliminating the need for a pre-exposures and reducing the likelihood of poor x-ray techniques in local image areas; (iii) by enabling direct measurement of the scatter field, the proposed method allows further scatter correction resulting in image quality improvements; (iv) finally, full-frame sampling of a digital detector allows imaging of the beam penumbra, thereby reclaiming the detection quantum efficiency loss due to over-collimation in current TDI slotscanning approach; the resulting DQE potentially exceeds that of flat-panel detectors by a factor up to two.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multispectral single-scan lung imaging system: initial feasibility

Besson

Crocker

2006

SPIE Proceedings

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“…A single x-ray exposure can be used with a frontback detector, and its performance can be improved with the incorporation of a filter layer between the two cells. [9][10][11][12][13][14] While this method is simpler to implement, its precision is inferior to that of the dual kVp approach for the same dose. 15 Alternatively, consider a detector in which the energy deposited could be measured as a function of depth in the detector.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to making ''material selective'' images, multienergy imaging systems may be called upon to generate ''radiographic'' images. 12 For example, dual energy x-ray absorptiometry ͑DEXA͒ systems yield not only images and quantitation of bone mineral using dual energy subtraction, but also high SNR single energy anatomic images. Therefore, this mode was included in our evaluation of the relative performance of the multi-cell detector.…”

Section: Introductionmentioning

confidence: 99%

Depth‐segmented detector for x‐ray absorptiometry

Stevens

Pelc

2000

Medical Physics

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A new energy-dependent multi-cell detector, which is a generalization of the conventional front-back detector, was studied using computer simulations. The noise performance of the detector for bone quantitation was examined in comparison to an ideal energy discriminating detector, and front-back detectors with and without inter-detector filters. The front-back detectors were optimized for a reference object composed of water and bone, and then compared to the new detector over a range of object compositions. In this paper, precision in calculated bone thickness is used as the criterion for evaluating detector performance. Simulations show that the segmented detector always performs better than the front-back detector without an inter-detector filter. It outperforms the detector incorporating a filter by an amount that depends on the heterogeneity of the x-ray spectrum. In addition, for single component radiographic images, this multi-cell detector retains information which is lost in the front-back detector with a filter layer.

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“…5 The theoretical optimization of any TPA method, by relating signal uncertainty to radiation dose, requires an expression of the signal variance. For a dual-energy scheme, Chakraborty et al 6 derived the fundamental uncertainty in bone mass due to quantum noise in the low and high energy measurements, based on earlier work in a different context by Morgan et al 7 We have extended the mathematics to show the uncertainty in the estimate of mass of the material of interest for a triple-energy absorptiometry approach.…”

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confidence: 98%

Theoretical analysis of error propagation in triple-energy absorptiometry: Application to measurement of lead in bonein vivo

1997

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We propose a three component tissue decomposition for quantifying lead in bone from a mixture of bone and muscle in vivo using a triple-energy absorptiometric method. The theoretical optimization of this method, by relating signal uncertainty to radiation dose, requires an expression of the signal variance. The error propagation was therefore theoretically modeled for a counting detector, assuming noise dominance by quantum statistics and neglecting covariance between energy levels. A final expression for the lead signal variance at each energy level was obtained via a Jacobian matrix. The Jacobian was maximized by choosing the first energy as low as permissible by dose constraints below the lead K edge. A second optimum was achieved when the upper energy was just above and the middle energy was just below the lead K edge. While the signal-to-noise ratio (SNR) had similar behavior to that of the Jacobian as a function of middle and upper energies, the SNR was almost constant as a function of lower energy in the 40-60 keV range. Hence, dose could be reduced without SNR loss. A simulated clinical measurement on an adult tibia using a 50 mCi 155Eu source and a 10 min acquisition time resulted in a standard deviation of 4 micrograms Pb/g bone mass. This approach can be applied to other systems containing three components, provided there is a K edge within the counting energy range.

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Performance characteristics of a dual‐energy detector for digital scan projection radiography

Cited by 13 publications

References 0 publications

Multispectral single-scan lung imaging system: initial feasibility

Multispectral single-scan lung imaging system: initial feasibility

Depth‐segmented detector for x‐ray absorptiometry

Theoretical analysis of error propagation in triple-energy absorptiometry: Application to measurement of lead in bonein vivo

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