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  PhD Student Phase retrieval for X-ray phase contrast tomography experiments at PETRA III

   Institute of Materials Physics

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  Dr Julian Moosmann  No more applications being accepted  Funded PhD Project (Students Worldwide)

About the Project

Reference code: 50073090_4 – 2021/WP 8

Commencement date: as soon as possible

Work location: Hamburg

Application deadline: January 2nd, 2022

Helmholtz-Zentrum Hereon

The Helmholtz-Zentrum Hereon conducts cutting-edge international research for a changing world: Around 1,100 employees contribute to the tackling of climate change, the sustainable use of the world's coastal systems and the resource-compatible enhancement of the quality of life. From fundamental research to practical applications, the interdisciplinary research spectrum covers a unique range.

Institute of Materials Physics

The Institute of Materials Physics operates instruments on large-scale equipment for structural investigations of materials and works on the development and characterization of novel light­weight materials for high-temper­ature applications, for example in aircraft turbines and automotive engines. Hereon has a unique infrastructure for comple­mentary materials research with photons and neutrons.

Helmholtz-Zentrum Hereon maintains a permanent outstation at DESY in Hamburg in order to provide synchrotron radiation to our users from academia and industry for the purpose of materials science. At the world’s largest synchrotron radiation source PETRA III we jointly operate imaging beamlines (P05 IBL, P07 HEMS) for X-ray computed tomography (CT).

During tomography experiments large amounts of 3D and 4D imaging data are acquired. In addition to conventional attenuation contrast tomography, phase contrast imaging techniques are employed in order to enhance the signal intensity and to visualize soft tissues. In situ / operando / in vivo experiments impose further restrictions on the scan times or the X-ray dose and therefore require a fine tuning of experimental parameters. In order to enhance image quality, reduce artefacts, accelerate data acquisition and extend these techniques beyond current limitations, advanced phase retrieval methods will be implemented including algebraic, iterative, functional or learning-based approaches. In addition, combined approaches for phase retrieval and tomographic reconstruction are investigated.

The position is initially limited to three years.

Equality of opportunity is an important part of our personnel policy. We would therefore strongly encourage qualified women to apply for the position.

Your tasks

  • implementation of advanced phase retrieval methods for propagation- and grating-based phase contrast tomography experiments at a synchrotron radiation source
  • application of machine-learning-based approaches for phase retrieval
  • participation in tomography experiments (beamtimes) at our PETRA III beamlines
  • close collaboration with colleagues and beamline scientists
  • publish and present scientific results at international conferences and workshops

Your profile

  • excellent diploma or master’s degree in physics, mathematics, computer science or equivalent
  • experience in X-ray tomography, phase contrast imaging, or image processing
  • knowledge in the areas of deep learning
  • proficient in a relevant programming language (e.g. Python, Matlab, C/C++, CUDA)
  • team player with good communication skills
  • motivation to work in an interdisciplinary and international team
  • excellent knowledge of English or German

Qualifications considered assets:

  • experience in scientific computing (high performance computing, parallel or distributed data processing)
  • experience in software development
  • experience with image enhancement, image segmentation, or image registration
  • experience with experiments at a synchrotron-radiation source
  • good communication skills in German

Informal enquiries can be directed to Dr. Julian Moosmann: [Email Address Removed]

We offer you

  • multinational work environment with ca. 1,100 colleagues from more than 50 nations
  • extensive options of vocational training (i. a. expert seminars, language courses or leadership seminars)
  • flexible working hours and various models to ensure the compatibility of family and career
  • excellent infrastructure, including a scientific in-house library as well as modern work spaces
  • remuneration according to the standards of the collective wage agreement TV-AVH including further social benefits
  • free employee advice - Employee Assistance Program (EAP)
  • childcare offers
  • Welcome Office, guest accommodation


Then we are looking forward to receiving your comprehensive application documents including a short and concise motivation letter (max. 1 page), a CV, a letter of recommendation, copies/​transcripts of certificates including grades, a list of publications, a proof of your English skills (TOEFL, IELTS or equivalent), and a (link to) pdf file of your master thesis. The appli­cation must not exceed 10 MB.

Reference number: 2021/WP 8

Apply now

Severely disabled persons and those equaling severely disabled persons who are equally suitable for the position will be considered preferentially within the framework of legal requirements.

Physics (29)
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 About the Project