Comparison of current and energy X-ray measurement methods in contrast media detection

To turn the advantage of energy measurement in x-ray transmission diagnosis into practice, we propose a novel detector for the estimation of x-ray energy distribution. This detector consists of several segment detectors arrayed in the direction of x-ray incidence. Each segment detector measures x-rays as current. With unfolding measured currents, the x-ray energy distribution is obtained. The practical application of this detector was verified by estimating the iodine thickness in an acryl phantom.

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“…Here, Y 2 and Y 3 are equal to 0 1 and 0 2 in previous papers. [1][2][3][4] With ÈðtÞ, the iodine contrast CðtÞ is estimated as…”

Section: Resultsmentioning

confidence: 99%

“…5. As previously described, [1][2][3][4] the estimation of iodine thickness was performed using the x-ray events of two energy ranges: 28-33 and 34-39 keV. The purpose of unfolding measured currents is the estimation of x-ray events in these two energy ranges.…”

Section: Unfolding Methodsmentioning

confidence: 99%

A Current-Mode Detector for Unfolding X-ray Energy Distribution

Kanno

Imamura

Mikami

et al. 2008

J. Nucl. Sci. Technol.

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“…The use of energy information of X-rays gives following advantages: (1) X-ray absorption by iodine is observed in the same way despite of the X-ray tube voltage and of the thickness of the subject (beam hardening effect free) [2]; (2) CT value of iodine is nearly twofold higher than the one obtained by current measurement CT [5]; (3) dose exposure is reduced to 1/2 to 1/3 when an X-ray filter, such as a lanthanum filter, is applied at the exit of X-ray tube [1].…”

Section: Articlementioning

confidence: 99%

Low dose exposure diagnosis with a transXend detector aiming for iodine-marked cancer detection

Kanno

Shimazaki

Imamura

et al. 2012

Journal of Nuclear Science and Technology

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The energy resolved computed tomography (CT), which had advantage over conventional CT (twofold higher CT value for iodine contrast agent and being free from beam hardening effect), was shown practical by employing the transXend detector: it measured X-rays as electric current and gave energy distribution of incident X-rays after analysis. This article shows a new application of the transXend detector for estimating the thicknesses of acrylic, iodine, and aluminum in a phantom. For this purpose, the responses of the segment detectors in the transXend detector are changed intentionally with inserting filters. With previously obtained two-dimensional maps for acrylic-iodine and acrylicaluminum thicknesses, which are shown by the ratios of electric currents measured by the segment detectors, the thickness of materials on the path of the X-rays are obtained by a transmission measurement.

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“…1) When compared with the conventional current measurement method of CT, the energy-resolved CT has nearly double the contrast obtained with an iodine contrast agent. 2) This means that only half the amount of iodine contrast agent is necessary when using the energy-resolved CT method and results in the lessening of the potential side effects incurred with the use of iodine contrast agents.…”

Section: Introductionmentioning

confidence: 99%

Advantages of Response Function Change in a transXend Detector with Various Scintillators as Substrates of Segment Detectors

Kanno¹,

Minami²,

Imamura³

et al. 2011

Journal of Nuclear Science and Technology

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To enable practical computed tomography (CT) that uses the energy information of X-rays, the ''transXend detector'' was developed to provide energy information about incident X-rays by measuring them as an electric current. The transXend detector requires a spectrum survey method in the unfolding process for measuring the energy distribution of incident X-rays, when the response functions of segment detectors have nearly the same behavior. When employing various scintillators with different effective atomic numbers and densities as the substrates of the segment detectors, better convergence is obtained in the unfolding process by using only one initial guess spectrum. Additionally, less dose exposure is possible when using the transXend detector with various segment detectors, compared with the transXend detector that consists of the segment detectors with the same substrate.

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Comparison of current and energy X-ray measurement methods in contrast media detection

Cited by 11 publications

References 3 publications

A Current-Mode Detector for Unfolding X-ray Energy Distribution

A Current-Mode Detector for Unfolding X-ray Energy Distribution

Low dose exposure diagnosis with a transXend detector aiming for iodine-marked cancer detection

Advantages of Response Function Change in a transXend Detector with Various Scintillators as Substrates of Segment Detectors

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