Electrical Analysis for Planar-type Digital X-ray Detector with Inert Gas

Yun, Min; Nam, Sang-Hee; Park, Sung-Kwang; Jung, Suk-Hee

doi:10.3938/jkps.56.1083

Cited by 4 publications

(4 citation statements)

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“…In a previous study, the feasibility of the gas-type X-ray sensor was proved by measuring its high sensitivity to X-ray energy and low charge trapping phenomenon [7]. Also, the kinds of mixture gas and their injection ratio in the gas-type X-ray detector were optimized to efficiently convert X-rays into electrical charges [8].…”

Section: Jinst 7 P07016mentioning

confidence: 99%

Application of charge-injection devices for digital X-ray imaging using a planar gas-type X-ray detector

Oh¹,

Shin²,

Yun³

et al. 2012

J. Inst.

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We have developed a planar gas-type detector, based on a charge injection device; this device can be used for digital X-ray imaging. Previously, in order to obtain X-ray images, a planar gas-type detector utilized a line-scanning module based on a one-dimensional readout system; however, that technology suffered from a limitation such as a long readout time, not suitable for a fluoroscopy or a moving imaging acquisition. In this study, a readout module based on chargeinjection devices was used in conjunction with the planar gas-type detector to acquire signals and two-dimensional digital images. In the original design, two orthogonally cross-shaped top electrodes, called X address and Y address, played important roles in transferring and collecting the generated charges using electrical potential. During the optimization process, the shape of these top electrodes was modified into a honeycomb shape to increase the efficacy of charge collection. A mixture of gas and dielectric layers were selected to make an efficient gas-type detector for digital X-ray imaging. From the result, the electrical properties of the detector were investigated and the effectiveness of its geometrical design was proved. Measurements demonstrated the linearity of X-ray detection, and the successful movement and collection of charge using electrical potential. Thus, this modified planar gas-type detector and charge readout module using a charge-injection device made it possible to obtain two-dimensional images without using a scanning mode.

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Section: Jinst 7 P07016mentioning

confidence: 99%

Application of charge-injection devices for digital X-ray imaging using a planar gas-type X-ray detector

Oh¹,

Shin²,

Yun³

et al. 2012

J. Inst.

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show abstract

“…However, the difficulty in manufacturing high resolution devices is slowing down the development of this technology. Sungho Cho proposed a new type of radiation detector, called hybrid PDP detector based on the integration of a photoconductor in a coplanar PDP . The detector has the same structure as that of a conventional PDP, except for the photoconducting layer, and it shows a good signal response and linearity.…”

Section: Introductionmentioning

confidence: 99%

“…Sungho Cho proposed a new type of radiation detector, called hybrid PDP detector based on the integration of a photoconductor in a coplanar PDP. 4,5 The detector has the same structure as that of a conventional PDP, except for the photoconducting layer, and it shows a good signal response and linearity. The detector is expected to have low cost, because it can apply the fabrication and material technology widely used in PDPs.…”

Section: Introductionmentioning

confidence: 99%

Flat panel detector based on a shadow mask plasma display panel

et al. 2014

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A flat panel detector based on the structure of a shadow mask plasma display panel is analyzed in terms of the electron amplification factor when used in the Townsend mode. The detector consists of a metal shadow mask and two ultra‐thin glass substrates with electrodes depositing on them. The shadow mask divides the detecting area into arrays of independent cells. The electron gain and linearity of the device are investigated by simulation based on the particle‐in‐cell/Monte Carlo collision model. Similar experiments are carried out. Both experimental and simulation results show that the linearity of the detector is significant. The applied voltages and the effective cathode area are parameters affecting its gain. As the avalanche process in the center of the cell with small electric field strength is much smaller than that near the shadow mask edge, the gain increases exponentially with the anode voltage but decreases with the negative shadow mask voltage. The balance between effective cathode area and high electric field intensity near the shadow mask edge provides room for future optimization of the detector. In conclusion, the flat panel detector is a promising component in a detection system for high energy radiation, and the wide application of the device is expected.

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“…Recently direct sensors, which are based on an amorphous selenium (a-Se) layer, have high spatial resolution to indirect sensors [1] , It is possible because the radiation caused by spreading light is eliminated [2], [3] . But generally low x-ray sensitivity leads to the low conversion efficiency.…”

Section: ⅰ Introductionmentioning

confidence: 99%

The Evaluation of the Thick Polycrystalline HgO and PbO Films Derived by Particle Sedimentation Method for the Mammographic Application

Noh¹,

Park²,

Choi³

et al. 2014

Journal of the Korean Society of Radiology

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In this study, the morphology and the x-ray quantum efficient of mercury oxide (HgO) and lead oxide (PbO) sensors derived by particle sedimentation method were discussed. In the pursuit of this purpose, we investigated the electrical characteristics and the x-ray quantum efficiency of various thicknesses of HgO and PbO films in mammographic x-ray energy. We have therefore developed a particle-in-binder sedimentation method of fabricating large area polycrystalline films onto transparent glass substrates coated with indium tin oxide. We are currently optimizing the growth method to improve the quantum efficiency with the ultimate goal of obtaining as quantum efficiency close to that of single crystal performance. Our future efforts will concentrate on optimization of large area film growth techniques specifically for deposition on a-Si:H flat panel readout arrays.

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Electrical Analysis for Planar-type Digital X-ray Detector with Inert Gas

Cited by 4 publications

References 0 publications

Application of charge-injection devices for digital X-ray imaging using a planar gas-type X-ray detector

Application of charge-injection devices for digital X-ray imaging using a planar gas-type X-ray detector

Flat panel detector based on a shadow mask plasma display panel

The Evaluation of the Thick Polycrystalline HgO and PbO Films Derived by Particle Sedimentation Method for the Mammographic Application

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