date: november 15, 2022

we are pleased to inform you that oleksandr grynko, brandon baldassi, and borys komarov attended the 2022 ieee nuclear science symposium and medical imaging conference and room temperature semiconductor detector conference in milan, italy, from november 5-12.

oleksandr presented an oral presentation titled “amorphous lead oxide based multilayer x-ray detector with near-theoretical sensitivity.” brandon and borys each presented posters with the respective titles: “low-dose imaging performance of a clinical organ-targeted positron emission tomography (pet) camera” and “application of gpu-based reconstruction for a clinical organ-targeted pet scanner.” more information about the conference and other presentations can be found here.

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oleksandr g., oleksandr b., and alla reznik went to ghent, belgium to present a
comparative study on recombination of the x-ray generated charge in amorphous selenium (a-
se) and amorphous lead oxide (a-pbo) photoconductors. the joint conference they presented at
was the 9th international conference on optical, optoelectronic and photonic materials and
applications, and the 14th euro physical conference on defects in insulating materials
(icoopma-eurodim 2022). more information regarding the conference and other
presentations can be found here.

the post oleksandr grynko, oleksandr bubon, and alla reznik present at conference in belgium appeared first on rezniklab and posted by pavlo karasyuk.

oleksandr grynko and alla reznik published two chapters in the first volume of
photoconductivity and photoconductive materials: fundamentals, techniques and applications.
they were responsible for writing chapter eight and chapter sixteen.

chapter eight is called charge extraction by linearly increasing voltage (celiv) method for
investigation of charge carrier transport and recombination in disordered materials, and
discusses a modern technique used for finding charge mobility in a material. chapter 16
discusses progress in lead oxide x -ray photoconductive layers.

congratulations to you both on contributing to this book, and its recent publication.

full book can be found on wiley here.

the post congratulations to oleksandr grynko and alla reznik on chapters published in photoconductivity and photoconductive materials. appeared first on rezniklab and posted by pavlo karasyuk.

oleksandr grynko and tristen thibault travelled to san diego, united states to present their research at the 2022 spie physics of medical imaging conference.

the post oleksandr grynko and tristan thibault present at 2022 spie physics of medical imaging conference appeared first on rezniklab and posted by pavlo karasyuk.

congragulations oleksandr grynko on defending your dissertation and receiving your
phd in chemistry and materials science. the topic of oleksandr’s phd was amorphous lead
oxide (a-pbo) for direct conversion x-ray imaging detectors. reznik’s group sends you wishes
and blessings for the career prospects.

the post congratulations: oleksandr grynko on a completed phd! appeared first on rezniklab and posted by pavlo karasyuk.

oleksandr grynko with co-authors: tristen thibault, emma pineau, and alla reznik
published a paper titled “the x-ray sensitivity of an amorphous lead oxide photoconductor” in
special issue: sensors and x-ray detectors. congratulations on the published paper!

abstract

the photoconductor layer is an important component of direct conversion flat panel x-ray
imagers (fpxi); thus, it should be carefully selected to meet the requirements for the x-ray
imaging detector, and its properties should be clearly understood to develop the most optimal
detector design. currently, amorphous selenium (a-se) is the only photoconductor utilized in
commercial direct conversion fpxis for low-energy mammographic imaging, but it is not
practically feasible for higher-energy diagnostic imaging. amorphous lead oxide (a-pbo)
photoconductor is considered as a replacement to a-se in radiography, fluoroscopy, and
tomosynthesis applications. in this work, we investigated the x-ray sensitivity of a-pbo, one of
the most important parameters for x-ray photoconductors, and examined the underlying
mechanisms responsible for charge generation and recombination. the x-ray sensitivity in terms
of electron–hole pair creation energy, w±, was measured in a range of electric fields, x-ray
energies, and exposure levels. w± decreases with the electric field and x-ray energy, saturating
at 18–31 ev/ehp, depending on the energy of x-rays, but increases with the exposure rate. the
peculiar dependencies of w± on these parameters lead to a conclusion that, at electric fields
relevant to detector operation (~10 v/μm), the columnar recombination and the bulk
recombination mechanisms interplay in the a-pbo photoconductor.

continue reading the article: https://doi.org/10.3390/s21217321

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oleksandr grynko presented at the 2021 ieee nuclear science symposium, medical
imaging conference and room-temperature semiconductor detectors conference (nss-mic-
rtsd). this year, it was held virtually and oleksandr’s oral presentation was titled “the x-ray
sensitivity of amorphous lead oxide direct conversion x-ray detector”.

the post oleksandr grynko presents at 2021 ieee nuclear science symposium, medical imaging conference and room-temperature semiconductor detectors conference (nss-mic-rtsd) appeared first on rezniklab and posted by pavlo karasyuk.

oleksandr grynko presented at the 2021 international conference on sensors and
electronic instrumentation advances (seia). his topic was on his research in “multilayer
amorphous lead oxide–based x-ray detector”.

the post oleksandr grynko presents at the 2021 international conference on sensors and electronic instrumentation advances (seia) appeared first on rezniklab and posted by pavlo karasyuk.

congratulations to oleksandr grynko for winning the graduate studies research
excellence award in the nserc category. oleksandr is a phd student in chemistry and
material science doing his research with alla reznik as a supervisor.

research and innovation week 2021 is held annually at 阿根廷vs墨西哥竞猜 . the awards are
given to commemorate the exceptional achievements of professors, partners, and 世界杯2022赛程表淘汰赛 . more
information regarding the other awards can be found here.

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oleksandr grynko with co-authors: tristen thibault, emma pineau, and alla reznik
published a paper titled “engineering of a blocking layer structure for low-lag operation of
the a-pbo-based x-ray detector” in ieee transactions on electron devices (volume: 68,
issue: 5, may 2021). congratulations on the published paper!

abstract

direct conversion flat panel detectors are of great significance to the field of medical x-ray
imaging since they offer imaging performance and diagnostic capabilities not achievable with
other methods. currently, mammographic direct conversion detectors employ a layer of
amorphous selenium (a-se) photoconductor. although its properties ideally fit the requirements
of mammography, where “soft” x-rays are used, a-se cannot be used in high-energy x-ray
procedures. to extend the diagnostic capabilities of the direct conversion detectors, amorphous
lead oxide (a-pbo) is proposed as an alternative photoconductor. it is a high effective atomic
number material and thus has a higher x-ray stopping power over the wide x-ray energy range.
a-pbo is, therefore, a suitable candidate for applications in radiography, fluoroscopy, and digital
tomosynthesis. here, we report on the development of a blocking structure with a polyimide (pi)
layer needed to maintain low dark current at high electric fields. we demonstrate that a 1- μm-
thick pi blocking layer allows the operation of the detector at strong electric fields (≥10 v/ μm)
while suppressing the dark current to an innocuous level (<; 1 pa/mm 2 ). it also improves
temporal performance by reducing signal lag. no ghosting effect was observed at exposure rates
up to 1 r/s; however, at high radiation levels, the detector's sensitivity degraded. this
degradation is not permanent as the detector restores its original sensitivity after several hours of
rest in the dark without bias applied.

continue reading the article: https://doi.org/10.1109/ted.2021.3067616

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