About us at ARISTRA

ARISTRA is the radiology network for doctors and patients. We bring the knowledge of international radiology specialists to you. Founded by medical professionals, we connect specialists from different fields, infrastructure providers, internationally active researchers, and patients to achieve optimal MRI imaging for all involved.
The team of ARISTRA, the radiology network
Table of contents

The ARISTRA network

Challenges in radiology
In our daily work, doctors experience the demands increasing on all levels.
The growth in knowledge in the medical field has reached a speed that a single person can hardly keep up. At the same time, you must follow more legal requirements. The challenges regarding practice marketing, digitalisation, and practice management are increasing.
Our vision for a modern radiology
Our vision is to jointly shape these challenges through cooperation, interdisciplinary knowledge exchange, and networking across medical fields.
ARISTRA brings together young radiologists who start their practice, established doctors, specialists from various disciplines, and international specialists from many different fields.
Together we form an open, interdisciplinary radiology network.
For good radiology to prevail in the future, it must be open to new concepts. Radiology practices cannot exist on their own. They should actively position themselves as a diagnostic interface in clinical treatment paths for colleagues and patients. Radiologists thus have the opportunity to play a central role in interdisciplinary cooperation while structures change. For this, a professional exchange at eye level with clinical colleagues is crucial.
Partnerships
To offer state-of-the-art MRI technology and optimal diagnostic quality throughout the area, we cooperate with infrastructure providers and the leading equipment manufacturers for medical imaging.
In this way, as many patients as possible can benefit from the capabilities of the ARISTRA network.
In addition, we help practices and hospitals expand their medical portfolio via our teleradiology services. They can gain access to specialist expertise and thus broaden their services. In this way, staff shortages due to holidays or illness can also be compensated at short notice and unbureaucratically.
The specialist network
At ARISTRA, we believe that, in addition to a solid general radiology education, sub-specialisation offers advantages for patients and clinical colleagues. To acquire this specialisation, you need continuous education and flexibility at work.
During our research at leading universities, we have experienced that many treatment options are rarely on a broad scale. Top international researchers have specialised in particular fields of medical imaging. However, due to limited capacities, they can hardly reach all patients who can benefit from their knowledge.
ARISTRA invites international experts from all medical fields to bring their imaging knowledge directly to patients. We integrated experts in neuroradiology, cardiology, musculoskeletal radiology, and many more into the ARISTRA network.
Patients can experience state-of-the-art MRI imaging and diagnostics anytime and from any location. The experts reach more patients with their skills. At the same time, they are safe, and their knowledge remains protected.
Together
Together we can further develop the ARISTRA network. We connect medical specialists from all disciplines: Radiologists, application specialists, nuclear medicine physicians, a radiologist who wants to work in teleradiology from home, and international specialists. By cooperating, all participants will benefit.

Would you like to expand the ARISTRA network with us? Is medical quality for patients your priority? Are you looking for change and self-realisation in a dynamic team? Please get in contact.
We are looking forward to meeting you!

Physicians at the partner practices

Independent radiologists in their practice are a significant part of our network. Well connected among each other, the branches of the network become dynamic and interactive. This way, continuous professional and personal development is possible in your practice. Do you want to be self-employed with financial security? The network of independent radiologists is looking forward to meeting you!
Dr. med. Annika Kowoll
Dr. med. Annika Kowoll is an expert in neuroradiology. Her medical specializations are in radiology and neurology. She researched the fields of strokes and neuro-onc
PD Dr. med. Andreas Lubienski
Priv.-Doz. Andreas Lubienski is a specialist in radiology and an expert in abdominal, musculoskeletal, and interventional radiology.
Jonas Roesler
Jonas Roesler completed his radiology specialist training at various large hospitals with a focus on internal medicine and surgery.
Anna von Witzleben
Anna von Witzleben is a specialist in radiology and an expert in paediatric radiology. She studied in Spain and practised in various German hospitals.
More radiologists
PD Dr. med. Yasemin Tanyildizi
PD Dr. med. Yasemin Tanyildizi is a certified specialist in radiology and an expert in neuroradiology. She researched at the University Medical Centre Mainz.
Dr. med. Karl-Wilhelm Westerburg
Dr. med. Karl-Wilhelm Westerburg is a certified specialist in radiology and nuclear medicine. He is a lecturer at the Fresenius University of Applied Sciences.
Dr. med. Nikolaus Loehr
Dr. med. Nikolaus Loehr has a medical specialization in radiology with a focus on the musculoskeletal system. He has researched and worked in trauma surgery.
PD Dr. med. Christoph Agten
PD Dr. med. Christoph Agten is an expert in musculoskeletal radiology with a focus on MRI. He has worked as a senior physician at Balgrist University Hospital.
Dr. med. Michael Ho
Dr. med. Michael Ho is a certified radiology specialist. He is an expert in peripheral nerve imaging and the managing director and co-founder of ARISTRA.
Dr. med. Andreas Kasperczyk
Dr. med. Andreas Kasperczyk is a specialist in radiology and an expert in musculoskeletal radiology, of the temporomandibular joints (CMD) and MR mammography.
Dr. med. Stefan Rosenstengel
Dr. med. Stefan Rosenstengel is a radiology specialist in Vaals near Aachen.
Dr. med.
Stefan Rosenstengel
Partnerpraxis Aachen
Prof. Dr. med. Lorenz Jäger
Prof. Dr. med. Lorenz Jäger is an ENT, neuro-, musculoskeletal and oncological radiology expert. He has held two visiting professorships since 2018.
Dr. med. Kai-Thorsten Müller
Dr. med. Kai-Thorsten Müller has many years of experience in cross-sectional imaging of the musculoskeletal system in neurology and the abdomen.
Dr. med.
Kai-Thorsten Müller
Partner practice Stuttgart
Dr. med. Benedikt Blum
Dr. med. Benedikt Blum is is a certified specialist in radiology FMH. He is an expert in the fields of computer tomography (CT) and ultrasound (visceral sonography).
PD Dr. med. Johann-Martin Hempel
PD Dr. med. Johann-Martin Hempel is an expert in neuroradiology and head and neck radiology. He practised at the University Hospital in Tübingen for many years.
Dr. med. Thomas Hambrock
Dr. med. Thomas Hambrock is an expert in prostate cancer and oncological radiology. He is researching the development of oncological MRI sequences.
Dr. scient. med.
Thomas Hambrock
Partner practice Frankfurt a. M. and Münster
Marcel Sokolowski
Marcel Sokolowski is a specialist in radiology and an expert in cardiovascular imaging, especially magnetic resonance imaging of the heart.
Stefan Dawirs
Stefan Dawirs is a certified radiology specialist with a particular interest in musculoskeletal imaging.
Stefan Dawirs
Partner practice Berlin

International experts

ARISTRA looks for imaging specialists all over the world. This way, we can bring their expertise to all our patients.
Prof. Shinji Naganawa
Prof. Shinji Naganawa is a pioneer in inner ear imaging. He has researched the optimisation of MR protocols for internal ear pathologies for over 25 years.
Prof. Dr. med. Wibke Müller-Forell
Prof. Wibke Müller-Forell is Professor Emeritus at the Johannes Gutenberg University Mainz, where she was acting head of the Institute for Neuroradiology.
Prof. Dr. med. Philipp Bäumer
Prof. Dr. med. Philipp Bäumer is a specialist in radiology with an additional qualification in neuroradiology. He is an expert in the imaging of peripheral nerves.
PD Dr. med. Christoph Agten
PD Dr. med. Christoph Agten is an expert in musculoskeletal radiology with a focus on MRI. He has worked as a senior physician at Balgrist University Hospital.
More specialists
PD Dr. med. Markus Zimmermann
PD Dr. med. Markus Zimmermann is an expert in interventional radiology and abdominal imaging. He specialized in CT and MRI diagnostics of the liver.
PD Dr. med.
Markus Zimmermann
Marcel Sokolowski
Marcel Sokolowski is a specialist in radiology and an expert in cardiovascular imaging, especially magnetic resonance imaging of the heart.
Dr. med. Matthias W. Wagner
Dr. med. Matthias Wagner is an expert in pediatric neuroradiology. He gained experience in Switzerland, the USA and Canada.
Prof. Dr. med. Lorenz Jäger
Prof. Dr. med. Lorenz Jäger is an ENT, neuro-, musculoskeletal and oncological radiology expert. He has held two visiting professorships since 2018.
Dr. med. Kira Lutz
Dr. med. Kira Lutz has a medical specialization in radiology with a focus on neuroradiology. She researched at the Heidelberg University Hospital and in Freiburg.

Radiology services

Second opinion

Our Second Opinion service connects patients from all over the world with specialists in medical imaging. Suppose you want a second opinion regarding your MRI, CT, or X-Ray images. In that case, ARISTRA's Second Opinion can help you.

Teleradiology

Flexible working from home while keeping an eye on your family! ARISTRA combines radiological excellence for our partner hospitals and practices with your private life. Are you motivated and well-trained?

We look forward to welcoming you to the teleradiology team!

Team Organisation and Development

For the ARISTRA network to develop further, we need creative minds to think up and help shape new forms of cooperation and medical care. Are you an organizational or communication talent? A technical genius? If precision, team spirit, and a sense of responsibility are among your strengths, you are welcome to join us!
Dr. med. Michael Ho
Dr. med. Michael Ho is a certified radiology specialist. He is an expert in peripheral nerve imaging and the managing director and co-founder of ARISTRA.
Dr. iur. Rodrigo Weihermann
Dr. iur. Rodrigo Weihermann, co-founder and Group General Counsel of the ARISTRA Group, is responsible for legal and compliance matters.
Lukas Sevcik
Lukas Sevcik is an expert in medical imaging applications. He has more than ten years of experience and leads the application team of ARISTRA in Switzerland.
PD Dr. med. Yasemin Tanyildizi
PD Dr. med. Yasemin Tanyildizi is a certified specialist in radiology and an expert in neuroradiology. She researched at the University Medical Centre Mainz.
More team members
Suresh Ghoerbien
Suresh Ghoerbien is an application specialist with a focus on cardio-MRI. His activities include protocol maintenance and the introduction of examination processes.
PD Dr. med. Christoph Agten
PD Dr. med. Christoph Agten is an expert in musculoskeletal radiology with a focus on MRI. He has worked as a senior physician at Balgrist University Hospital.
Meike Thiemann
Meike Thiemann is head of accounting at ARISTRA.
Meike Thiemann
Head of accounting
Jonas Zadow
Jonas Zadow has been working in media production for more than 20 years. At ARISTRA, he manages online marketing and implements our media productions.
Sonja Urban
Sonja Urban is responsible for ARISTRA's corporate identity. She has several years of experience as a graphic designer on the agency and corporate side.
Sonja Urban
Design Expert
Benedikt Brett
Benedikt Brett has extensive experience in practice management of radiology centres and GP practices. For ARISTRA, he is active in the area of billing.
Benedikt Brett
Billing
Nele Bihler
Nele Bihler, M. Sc., works at ARISTRA as a product manager and leads our radiological infrastructure team and the technical connection of partner practices.
Laura Laumann
Laura Laumann is responsible for organisational management at ARISTRA. Her main tasks are the analysis and optimisation of workflows and processes.
Laura Laumann
Organisational management
Sila Akbaba
Sila Akbaba supports us in the area of patient service and practice management.
Sila Akbaba
Patient services
Paulina Wülner
Paulina Wülner supports us in the area of patient service and practice management.
Paulina Wülner
Patient services
Veronika Witte
Veronika Witte is a trained nutritionist. She looks after the patients for ARISTRA on the customer hotline, and supports us in the field of practice management.
Veronika Schreiner
Patient services

Expertise

Our interdisciplinary team was trained at the best universities. They draw on long experience in research in addition to excellent medical training.
ARISTRA ExpertiseARISTRA ExpertiseARISTRA Expertise
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