Monte Carlo study of x-ray cross talk in a variable resolution x-ray detector

Melnyk, Roman; DiBianca, Frank A.

doi:10.1117/12.480014

Cited by 8 publications

(20 citation statements)

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“…Second, the cell separators have a given x-ray attenuation corresponding to a certain thickness of the attenuator and the deposited energy is E p . Then, intercell x-ray cross-talk is given by 16 …”

Section: Iib Intercell X-ray Cross-talkmentioning

confidence: 99%

“…[17][18][19] A brief qualitative description and quantitative analysis of x-ray cross-talk have been reported earlier. 4,16 The qualitative study presented a wide range of theoretical analysis without any specific model, whereas in the quantitative study, an actual VRX CT detector was simulated through Monte Carlo to investigate intercell and interarm x-ray cross-talk as a function of the size of the detector's FOV. The intercell x-ray cross-talk at FOVs of 24-38 cm was over the desirable value.…”

Section: Introductionmentioning

confidence: 99%

“…The intercell x-ray cross-talk at FOVs of 24-38 cm was over the desirable value. 16 It was suggested to scan all objects between 24 and 40 cm in diameter with the 40 cm FOV to minimize the deteriorating effect of intercell x-ray cross-talk on the resulting spatial resolution of the system.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15] The spatial resolution in the VRX detector is limited by several physical factors, intercell x-ray cross-talk being one of them for all variants of VRX CT detector designs. 16 The intercell x-ray cross-talk is defined as the percentage of radiation that can penetrate from one cell to the other cells through cell separators. X-ray attenuation of separators is one of the main factors that influence the intercell x-ray cross-talk.…”

Section: Introductionmentioning

confidence: 99%

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Novel detector design for reducing intercell x‐ray cross‐talk in the variable resolution x‐ray CT scanner: A Monte Carlo study

Arabi

Kamali-Asl

et al. 2011

Medical Physics

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Purpose:The variable resolution x-ray ͑VRX͒ CT scanner provides substantial improvement in the spatial resolution by matching the scanner's field of view ͑FOV͒ to the size of the object being imaged. Intercell x-ray cross-talk is one of the most important factors limiting the spatial resolution of the VRX detector. In this work, a new cell arrangement in the VRX detector is suggested to decrease the intercell x-ray cross-talk. The idea is to orient the detector cells toward the opening end of the detector. Methods: Monte Carlo simulations were used for performance assessment of the oriented cell detector design. Previously published design parameters and simulation results of x-ray cross-talk for the VRX detector were used for model validation using the GATE Monte Carlo package. In the first step, the intercell x-ray cross-talk of the actual VRX detector model was calculated as a function of the FOV. The obtained results indicated an optimum cell orientation angle of 28°to minimize the x-ray cross-talk in the VRX detector. Thereafter, the intercell x-ray cross-talk in the oriented cell detector was modeled and quantified. Results:The intercell x-ray cross-talk in the actual detector model was considerably high, reaching up to 12% at FOVs from 24 to 38 cm. The x-ray cross-talk in the oriented cell detector was less than 5% for all possible FOVs, except 40 cm ͑maximum FOV͒. The oriented cell detector could provide considerable decrease in the intercell x-ray cross-talk for the VRX detector, thus leading to significant improvement in the spatial resolution and reduction in the spatial resolution nonuniformity across the detector length. Conclusions: The proposed oriented cell detector is the first dedicated detector design for the VRX CT scanners. Application of this concept to multislice and flat-panel VRX detectors would also result in higher spatial resolution.

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Section: Iib Intercell X-ray Cross-talkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel detector design for reducing intercell x‐ray cross‐talk in the variable resolution x‐ray CT scanner: A Monte Carlo study

Arabi

Kamali-Asl

et al. 2011

Medical Physics

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show abstract

“…This last phenomenon is fortunately an issue only for submicroscopic angles, but the other two problems remain an issue. Several different VRX scanner prototypes have been implemented following the detector angulation method including those employed in this project, and a substantial amount of work has been done to study the viability of such a detector for CT imaging [14,16,17,18,40]. In the next sections we will describe several of these implementations.…”

Section: X-ray Detectors In Vrx Systemsmentioning

confidence: 99%

Development and Application of Computational Tools for the Study and Optimization of Variable Resolution X-ray (VRX) Computed Tomography Scanners

Rendon¹

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Simulation study on detection efficiency of plastic scintillating fiber under γ-ray radiation

Tang

Yin

et al. 2008

Radiation Physics and Chemistry

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Monte Carlo study of x-ray cross talk in a variable resolution x-ray detector

Cited by 8 publications

References 0 publications

Novel detector design for reducing intercell x‐ray cross‐talk in the variable resolution x‐ray CT scanner: A Monte Carlo study

Novel detector design for reducing intercell x‐ray cross‐talk in the variable resolution x‐ray CT scanner: A Monte Carlo study

Development and Application of Computational Tools for the Study and Optimization of Variable Resolution X-ray (VRX) Computed Tomography Scanners

Simulation study on detection efficiency of plastic scintillating fiber under γ-ray radiation

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