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  1. Article: Ferromagnetic properties and conversion-electron Mossbauer spectroscopy of (La₂O₃)ₓ–(Bi₂O₃)₁₋ₓ–Fe₂O₃ films

    Xiao, RenZheng / Pelenovich, Vasiliy O / Fu, Dejun

    Materials letters. 2013 June 1, v. 100

    2013  

    Abstract: La₂O₃)ₓ–(Bi₂O₃)₁₋ₓ–Fe₂O₃ films were synthesized by the sol–gel technique on Si (100) substrates. The crystal structure of the samples was studied by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The magnetic ... ...

    Abstract (La₂O₃)ₓ–(Bi₂O₃)₁₋ₓ–Fe₂O₃ films were synthesized by the sol–gel technique on Si (100) substrates. The crystal structure of the samples was studied by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The magnetic properties were studied by vibrating sample magnetometry and conversion-electron Mossbauer spectroscopy (CEMS). The samples were amorphous or nanocrystallized in structure and had ferromagnetic properties with clear enhancement of saturation magnetization when La concentration was increased. The CEMS measurement revealed two doublets in the spectra. The central shift and quadrupole splitting of the doublets were increased with increasing La concentration. This is attributed to the decreasing of s-electron density in the iron nucleus and asymmetry of the electrical field around the nucleus enhanced by La doping.
    Keywords Mossbauer spectroscopy ; X-ray diffraction ; crystal structure ; electric field ; magnetic properties ; silicon ; transmission electron microscopy
    Language English
    Dates of publication 2013-0601
    Size p. 26-28.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1491964-3
    ISSN 1873-4979 ; 0167-577X
    ISSN (online) 1873-4979
    ISSN 0167-577X
    DOI 10.1016/j.matlet.2013.03.006
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  2. Article ; Online: Studies of La- and Pr-driven reverse distortion of FeO

    Xiao, RenZheng / Hu, Tao / Yuan, XianBao / Zhou, JianJun / Ma, XiaoQiang / Fu, DeJun

    RSC advances

    2018  Volume 8, Issue 22, Page(s) 12060–12068

    Abstract: ... The ... ...

    Abstract The Bi
    Language English
    Publishing date 2018-03-28
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/c8ra00263k
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  3. Article ; Online: Exploration of differentiability in a proton computed tomography simulation framework.

    Aehle, Max / Alme, Johan / Gábor Barnaföldi, Gergely / Blühdorn, Johannes / Bodova, Tea / Borshchov, Vyacheslav / van den Brink, Anthony / Eikeland, Viljar / Feofilov, Gregory / Garth, Christoph / Gauger, Nicolas R / Grøttvik, Ola / Helstrup, Håvard / Igolkin, Sergey / Keidel, Ralf / Kobdaj, Chinorat / Kortus, Tobias / Kusch, Lisa / Leonhardt, Viktor /
    Mehendale, Shruti / Ningappa Mulawade, Raju / Harald Odland, Odd / O'Neill, George / Papp, Gábor / Peitzmann, Thomas / Pettersen, Helge Egil Seime / Piersimoni, Pierluigi / Pochampalli, Rohit / Protsenko, Maksym / Rauch, Max / Ur Rehman, Attiq / Richter, Matthias / Röhrich, Dieter / Sagebaum, Max / Santana, Joshua / Schilling, Alexander / Seco, Joao / Songmoolnak, Arnon / Sudár, Ákos / Tambave, Ganesh / Tymchuk, Ihor / Ullaland, Kjetil / Varga-Kofarago, Monika / Volz, Lennart / Wagner, Boris / Wendzel, Steffen / Wiebel, Alexander / Xiao, RenZheng / Yang, Shiming / Zillien, Sebastian

    Physics in medicine and biology

    2023  Volume 68, Issue 24

    Abstract: Objective. ...

    Abstract Objective.
    MeSH term(s) Computer Simulation ; Protons ; Phantoms, Imaging ; Tomography, X-Ray Computed/methods ; Software ; Algorithms ; Monte Carlo Method
    Chemical Substances Protons
    Language English
    Publishing date 2023-12-15
    Publishing country England
    Document type Review ; Journal Article
    ZDB-ID 208857-5
    ISSN 1361-6560 ; 0031-9155
    ISSN (online) 1361-6560
    ISSN 0031-9155
    DOI 10.1088/1361-6560/ad0bdd
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  4. Article ; Online: Uncertainty-aware spot rejection rate as quality metric for proton therapy using a digital tracking calorimeter.

    Schilling, Alexander / Aehle, Max / Alme, Johan / Barnaföldi, Gergely Gábor / Bodova, Tea / Borshchov, Vyacheslav / van den Brink, Anthony / Eikeland, Viljar / Feofilov, Gregory / Garth, Christoph / Gauger, Nicolas R / Grøttvik, Ola / Helstrup, Håvard / Igolkin, Sergey / Keidel, Ralf / Kobdaj, Chinorat / Kortus, Tobias / Leonhardt, Viktor / Mehendale, Shruti /
    Ningappa Mulawade, Raju / Harald Odland, Odd / O'Neill, George / Papp, Gábor / Peitzmann, Thomas / Pettersen, Helge Egil Seime / Piersimoni, Pierluigi / Protsenko, Maksym / Rauch, Max / Ur Rehman, Attiq / Richter, Matthias / Röhrich, Dieter / Santana, Joshua / Seco, Joao / Songmoolnak, Arnon / Sudár, Ákos / Tambave, Ganesh / Tymchuk, Ihor / Ullaland, Kjetil / Varga-Kofarago, Monika / Volz, Lennart / Wagner, Boris / Wendzel, Steffen / Wiebel, Alexander / Xiao, RenZheng / Yang, Shiming / Zillien, Sebastian

    Physics in medicine and biology

    2023  Volume 68, Issue 19

    Abstract: Objective. ...

    Abstract Objective.
    MeSH term(s) Proton Therapy ; Uncertainty ; Protons ; Machine Learning ; Neural Networks, Computer
    Chemical Substances Protons
    Language English
    Publishing date 2023-09-20
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208857-5
    ISSN 1361-6560 ; 0031-9155
    ISSN (online) 1361-6560
    ISSN 0031-9155
    DOI 10.1088/1361-6560/acf5c2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Investigating particle track topology for range telescopes in particle radiography using convolutional neural networks.

    Pettersen, Helge Egil Seime / Aehle, Max / Alme, Johan / Barnaföldi, Gergely Gábor / Borshchov, Vyacheslav / van den Brink, Anthony / Chaar, Mamdouh / Eikeland, Viljar / Feofilov, Grigory / Garth, Christoph / Gauger, Nicolas R / Genov, Georgi / Grøttvik, Ola / Helstrup, Håvard / Igolkin, Sergey / Keidel, Ralf / Kobdaj, Chinorat / Kortus, Tobias / Leonhardt, Viktor /
    Mehendale, Shruti / Mulawade, Raju Ningappa / Odland, Odd Harald / Papp, Gábor / Peitzmann, Thomas / Piersimoni, Pierluigi / Protsenko, Maksym / Rehman, Attiq Ur / Richter, Matthias / Santana, Joshua / Schilling, Alexander / Seco, Joao / Songmoolnak, Arnon / Sølie, Jarle Rambo / Tambave, Ganesh / Tymchuk, Ihor / Ullaland, Kjetil / Varga-Kofarago, Monika / Volz, Lennart / Wagner, Boris / Wendzel, Steffen / Wiebel, Alexander / Xiao, RenZheng / Yang, Shiming / Yokoyama, Hiroki / Zillien, Sebastian / Röhrich, Dieter

    Acta oncologica (Stockholm, Sweden)

    2021  Volume 60, Issue 11, Page(s) 1413–1418

    Abstract: Background: Proton computed tomography (pCT) and radiography (pRad) are proposed modalities for improved treatment plan accuracy and : Material and methods: The CNN was trained by simulation and reconstruction of tens of millions of proton and helium ...

    Abstract Background: Proton computed tomography (pCT) and radiography (pRad) are proposed modalities for improved treatment plan accuracy and
    Material and methods: The CNN was trained by simulation and reconstruction of tens of millions of proton and helium tracks. The CNN filter was then compared to simple energy loss threshold methods using the Area Under the Receiver Operating Characteristics curve (AUROC), and by comparing the image quality and Water Equivalent Path Length (WEPL) error of proton and helium radiographs filtered with the same methods.
    Results: The CNN method led to a considerable improvement of the AUROC, from 74.3% to 97.5% with protons and from 94.2% to 99.5% with helium. The CNN filtering reduced the WEPL error in the helium radiograph from 1.03 mm to 0.93 mm while no improvement was seen in the CNN filtered pRads.
    Conclusion: The CNN improved the filtering of proton and helium tracks. Only in the helium radiograph did this lead to improved image quality.
    MeSH term(s) Humans ; Image Processing, Computer-Assisted ; Monte Carlo Method ; Neural Networks, Computer ; Phantoms, Imaging ; Radiography ; Telescopes
    Language English
    Publishing date 2021-07-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 896449-x
    ISSN 1651-226X ; 0349-652X ; 0284-186X ; 1100-1704
    ISSN (online) 1651-226X
    ISSN 0349-652X ; 0284-186X ; 1100-1704
    DOI 10.1080/0284186X.2021.1949037
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    Zs.A 6348: Show issues Location:
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  6. Article ; Online: Helium radiography with a digital tracking calorimeter-a Monte Carlo study for secondary track rejection.

    Pettersen, Helge Egil Seime / Volz, Lennart / Sølie, Jarle Rambo / Alme, Johan / Barnaföldi, Gergely Gábor / Barthel, Rene / van den Brink, Anthony / Borshchov, Vyacheslav / Chaar, Mamdouh / Eikeland, Viljar / Genov, Georgi / Grøttvik, Ola / Helstrup, Håvard / Keidel, Ralf / Kobdaj, Chinorat / van der Kolk, Naomi / Mehendale, Shruti / Meric, Ilker / Harald Odland, Odd /
    Papp, Gábor / Peitzmann, Thomas / Piersimoni, Pierluigi / Protsenko, Maksym / Ur Rehman, Attiq / Richter, Matthias / Tefre Samnøy, Andreas / Seco, Joao / Shafiee, Hesam / Songmoolnak, Arnon / Tambave, Ganesh / Tymchuk, Ihor / Ullaland, Kjetil / Varga-Kofarago, Monika / Wagner, Boris / Xiao, RenZheng / Yang, Shiming / Yokoyama, Hiroki / Röhrich, Dieter

    Physics in medicine and biology

    2021  Volume 66, Issue 3, Page(s) 35004

    Abstract: Radiation therapy using protons and heavier ions is a fast-growing therapeutic option for cancer patients. A clinical system for particle imaging in particle therapy would enable online patient position verification, estimation of the dose deposition ... ...

    Abstract Radiation therapy using protons and heavier ions is a fast-growing therapeutic option for cancer patients. A clinical system for particle imaging in particle therapy would enable online patient position verification, estimation of the dose deposition through range monitoring and a reduction of uncertainties in the calculation of the relative stopping power of the patient. Several prototype imaging modalities offer radiography and computed tomography using protons and heavy ions. A Digital Tracking Calorimeter (DTC), currently under development, has been proposed as one such detector. In the DTC 43 longitudinal layers of laterally stacked ALPIDE CMOS monolithic active pixel sensor chips are able to reconstruct a large number of simultaneously recorded proton tracks. In this study, we explored the capability of the DTC for helium imaging which offers favorable spatial resolution over proton imaging. Helium ions exhibit a larger cross section for inelastic nuclear interactions, increasing the number of produced secondaries in the imaged object and in the detector itself. To that end, a filtering process able to remove a large fraction of the secondaries was identified, and the track reconstruction process was adapted for helium ions. By filtering on the energy loss along the tracks, on the incoming angle and on the particle ranges, 97.5% of the secondaries were removed. After passing through 16 cm water, 50.0% of the primary helium ions survived; after the proposed filtering 42.4% of the primaries remained; finally after subsequent image reconstruction 31% of the primaries remained. Helium track reconstruction leads to more track matching errors compared to protons due to the increased available focus strength of the helium beam. In a head phantom radiograph, the Water Equivalent Path Length error envelope was 1.0 mm for helium and 1.1 mm for protons. This accuracy is expected to be sufficient for helium imaging for pre-treatment verification purposes.
    MeSH term(s) Calorimetry/instrumentation ; Helium ; Humans ; Monte Carlo Method ; Phantoms, Imaging ; Protons ; Radiography
    Chemical Substances Protons ; Helium (206GF3GB41)
    Language English
    Publishing date 2021-01-26
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208857-5
    ISSN 1361-6560 ; 0031-9155
    ISSN (online) 1361-6560
    ISSN 0031-9155
    DOI 10.1088/1361-6560/abca03
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  7. Book ; Online: Exploration of Differentiability in a Proton Computed Tomography Simulation Framework

    Aehle, Max / Alme, Johan / Barnaföldi, Gergely Gábor / Blühdorn, Johannes / Bodova, Tea / Borshchov, Vyacheslav / Brink, Anthony van den / Eikeland, Viljar / Feofilov, Gregory / Garth, Christoph / Gauger, Nicolas R. / Grøttvik, Ola / Helstrup, Håvard / Igolkin, Sergey / Keidel, Ralf / Kobdaj, Chinorat / Kortus, Tobias / Kusch, Lisa / Leonhardt, Viktor /
    Mehendale, Shruti / Mulawade, Raju Ningappa / Odland, Odd Harald / O'Neill, George / Papp, Gábor / Peitzmann, Thomas / Pettersen, Helge Egil Seime / Piersimoni, Pierluigi / Pochampalli, Rohit / Protsenko, Maksym / Rauch, Max / Rehman, Attiq Ur / Richter, Matthias / Röhrich, Dieter / Sagebaum, Max / Santana, Joshua / Schilling, Alexander / Seco, Joao / Songmoolnak, Arnon / Sudár, Ákos / Tambave, Ganesh / Tymchuk, Ihor / Ullaland, Kjetil / Varga-Kofarago, Monika / Volz, Lennart / Wagner, Boris / Wendzel, Steffen / Wiebel, Alexander / Xiao, RenZheng / Yang, Shiming / Zillien, Sebastian

    2022  

    Abstract: Objective. Algorithmic differentiation (AD) can be a useful technique to numerically optimize design and algorithmic parameters by, and quantify uncertainties in, computer simulations. However, the effectiveness of AD depends on how "well-linearizable" ... ...

    Abstract Objective. Algorithmic differentiation (AD) can be a useful technique to numerically optimize design and algorithmic parameters by, and quantify uncertainties in, computer simulations. However, the effectiveness of AD depends on how "well-linearizable" the software is. In this study, we assess how promising derivative information of a typical proton computed tomography (pCT) scan computer simulation is for the aforementioned applications. Approach. This study is mainly based on numerical experiments, in which we repeatedly evaluate three representative computational steps with perturbed input values. We support our observations with a review of the algorithmic steps and arithmetic operations performed by the software, using debugging techniques. Main results. The model-based iterative reconstruction (MBIR) subprocedure (at the end of the software pipeline) and the Monte Carlo (MC) simulation (at the beginning) were piecewise differentiable. Jumps in the MBIR function arose from the discrete computation of the set of voxels intersected by a proton path. Jumps in the MC function likely arose from changes in the control flow that affect the amount of consumed random numbers. The tracking algorithm solves an inherently non-differentiable problem. Significance. The MC and MBIR codes are ready for the integration of AD, and further research on surrogate models for the tracking subprocedure is necessary.

    Comment: 27 pages, 11 figures
    Keywords Physics - Medical Physics ; Computer Science - Mathematical Software
    Subject code 000
    Publishing date 2022-02-11
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Ferromagnetic properties and conversion-electron Mossbauer spectroscopy of (La₂O₃)ₓ–(Bi₂O₃)₁₋ₓ–Fe₂O₃ films

    Xiao, RenZheng / Pelenovich, Vasiliy O. / Fu, Dejun

    Materials letters

    Volume v. 100

    Abstract: La₂O₃)ₓ–(Bi₂O₃)₁₋ₓ–Fe₂O₃ films were synthesized by the sol–gel technique on Si (100) substrates. The crystal structure of the samples was studied by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The magnetic ... ...

    Abstract (La₂O₃)ₓ–(Bi₂O₃)₁₋ₓ–Fe₂O₃ films were synthesized by the sol–gel technique on Si (100) substrates. The crystal structure of the samples was studied by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The magnetic properties were studied by vibrating sample magnetometry and conversion-electron Mossbauer spectroscopy (CEMS). The samples were amorphous or nanocrystallized in structure and had ferromagnetic properties with clear enhancement of saturation magnetization when La concentration was increased. The CEMS measurement revealed two doublets in the spectra. The central shift and quadrupole splitting of the doublets were increased with increasing La concentration. This is attributed to the decreasing of s-electron density in the iron nucleus and asymmetry of the electrical field around the nucleus enhanced by La doping.
    Keywords transmission electron microscopy ; crystal structure ; Mossbauer spectroscopy ; X-ray diffraction ; silicon ; magnetic properties ; electric field
    Language English
    Document type Article
    ISSN 0167-577X
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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