Gerald Weisser

• MD, PhD
• Heidelberg University

Zusammenfassung Die Nutzung von Downloadlinks anstelle physischer Patienten-CDs erfordert neue Standards, um diese virtuellen Medien in die klinischen Prozesse integrieren zu können. Aufgrund der Herausforderungen in der Praxis wurde 2023, initiiert von der Deutschen Röntgengesellschaft (DRG) und dem Berufsverband Deutscher Radiologen (BDR), der DI...

Background: Perfusion imaging has become an important image based tool to derive the physiological information in various applications, like tumor diagnostics and therapy, stroke, (cardio-) vascular diseases, or functional assessment of organs. However, even after 20 years of intense research in this field, perfusion imaging still remains a resear...

In congenital diaphragmatic hernia (CDH), lung hypoplasia and secondary pulmonary hypertension are the major causes of death and severe disability. Based on new therapeutic strategies survival rates could be improved to up to 80%. However, after surgical repair of CDH, long-term follow-up of these pediatric patients is necessary. In this, dynamic c...

Kurzfassung: Die neue DIN V 6868 – 157 wurde am 01. November 2014 veroffentlicht und regelt die Abnahme- und Konstanzprufung fur qualitatssichernde Masnahmen an Bildwiedergabesystemen und ihrer Umgebung. Damit soll die gesamte Bilddarstellungskette gepruft werden. Als neues Konzept wurden Raumklassen eingefuhrt, die die Beleuchtungsstarke des Umgeb...

Surgical treatment for chronic subdural haematoma (CSH) has been analysed by applying evidence-based medicine (EBM) criteria earlier. Whether implementation of EBM-derived key factors into an optimised treatment algorithm would improve outcome, however, needs to be clarified. Symptomatic patients with CSH who fulfilled the inclusion criteria were e...

The aim of this cohort study was to assess the risk of developing cancer, specifically leukaemia, tumours of the central nervous system and lymphoma, before the age of 15 years in children previously exposed to computed tomography (CT) in Germany. Data for children with at least one CT between 1980 and 2010 were abstracted from 20 hospitals. Cancer...

Die neue DIN V 6868-157 wurde am 1. 11. 2014 veroffentlicht und beinhaltet die Abnahme- und Konstanzprufung fur qualitatssichernde Masnahmen an Bildwiedergabesystemen und ihrer Umgebung. Damit soll die gesamte Bilddarstellungskette (einschlieslich Hardware, Software und Bildwiedergabegerat) gepruft werden. Als neues Konzept werden Raumklassen einge...

Objectives: Recent technical developments have facilitated the application of cone-beam computed tomography (CBCT) for interventional and intraoperative imaging. The aim of this study was to compare the radiation doses and image quality in CBCT with those of conventional multislice spiral computed tomography (MSCT) for abdominal and genitourinary...

Durch Telekooperation kann die Versorgung von Schwerverletzten durch den Austausch von Behandlungs- und Bilddaten im Rahmen einer Notfallkonsultation, einer zweiten Meinung, einer Verlegung, der Rehabilitation oder in der Nachbehandlung unterstützt werden. Mit TKmed® wurde eine datenschutzkonforme Lösung entwickelt, die eine 2-Faktor-Authentifizieru...

Einleitung: Eine hochwertige Versorgung von Schwerverletzten erfordert die einrichtungsübergreifende Kooperation aller Beteiligten. Typische „use cases“ betreffen die „zweite Meinung“, „Abklärung einer Verlegungsindikation“, „Verlegung“ „Rehabilitation“, „Physiotherapie“ oder „ambulante Nachbehandlung“. Die Deutsche Gesellschaft für Unfallchirurgie...

BackgroundA significant proportion of acute care neurosurgical patients present to hospital outside regular working hours. The objective of our study was to evaluate the structure of neurosurgical on-call services in Germany, the use of modern communication devices and teleradiology services, and the personal acceptance of modern technologies by ne...

To correlate dual-energy computed tomography (DECT) pulmonary angiography derived iodine maps with parameter maps of quantitative pulmonary perfusion magnetic resonance imaging (MRI). Eighteen patients with pulmonary perfusion defects detected on DECT derived iodine maps were included in this prospective study and additionally underwent time-resolv...

Ziele: Aufgrund technischer Weiterentwicklungen stellt die Cone-Beam-CT (CBCT) eine Alternative zur konventionellen Mehrschichtspiral-CT (MSCT) dar – insbesondere fur bildgestutzte Interventionen und operative Eingriffe. Ziel dieser Studie war ein Vergleich zwischen beiden Geratetypen bezuglich Bildqualitat und Strahlendosis im Abdominalbereich. Me...

In spite of a growing number of radiological scans in pregnant women there is still a high level of uncertainty concerning radiation exposure to the fetus. At the same time, the risk of fetal radiation injury is frequently overestimated. This entails an avoidable fear in the pregnant patient and may delay urgently required imaging and thus lead to...

Background: Imaging of the urinary tract and its surrounding tissue still remains challenging, since standard imaging in the urological operation room consists of fluoroscopy and plain X-rays. The combination of a ceiling-mounted X-ray system and a new urological intervention table now allows cross-sectional imaging and 3D reconstruction to be per...

Telecooperation is used to support care for trauma patients by facilitating a mutual exchange of treatment and image data in use-cases such as emergency consultation, second-opinion, transfer, rehabilitation and out-patient aftertreatment. To comply with data protection legislation a two-factor authentication using ownership and knowledge has been...

To develop a generic Open Source MRI perfusion analysis tool for quantitative parameter mapping to be used in a clinical workflow and methods for quality management of perfusion data. We implemented a classic, pixel-by-pixel deconvolution approach to quantify T1-weighted contrast-enhanced dynamic MR imaging (DCE-MRI) perfusion data as an OsiriX plu...

Ziel und Methodik Immer komplexere Bestrahlungstechniken wie z. B. dynamische Techniken sind nur noch digital und bildgesteuert sinnvoll einsetzbar. Dadurch erhöhen sich ständig die Anforderungen an die Bilddokumentation und -archivierung. Diese Arbeit soll detailliert die aktuellen Anforderungen an das Bildmanagement in der Radioonkologie und mögl...

Digitization of the imaging modalities and the connectivity through the Internet has rapidly developed over the last 15 years. In Germany quite a few regional teleradiology networks exist, nevertheless, many of them are not interoperable due to the lack of an international or national teleradiology standard. Therefore, a range of different techniqu...

The aim was to investigate changes in the tumor bed on magnetic resonance mammography (MRM) after intraoperative radiotherapy (IORT) and whether they would limit the diagnostic value of posttherapeutic MRM. We retrospectively investigated 36 patients undergoing MRM after IORT (median interval 2.8 years, range 0.4-7.1). Wound cavities with fat necro...

Ziele: Ausgehend vom Weisbuch der Schwerverletztenversorgung bildeten sich in Deutschland 55 „TraumaNetzwerke“ (TNW's), welche Klinikzusammenschlusse zur Verbesserung der Polytraumaversorgung darstellen. Innerhalb der TNW's soll die Kommunikation, insbesondere durch teleradiologische Implementierungen i.S. der Bildbetrachtung vor allem bei Notfallv...

The development of a new urological intervention table now enables the application of an Artis zee ceiling Dyna-CT (Siemens, Erlangen, Germany) for interventional cross-sectional imaging and 3-D reconstruction of the urinary tract in the prone and supine positions (urological Dyna-CT). We tested the feasibility of the urological Dyna-CT with the ne...

Treatment techniques of increasing complexity such as dynamic/rotational techniques mandate digital management and increasingly image guidance. This constantly increases requirements for image management and archiving. This article discusses the current status of these requirements and will present potential image administration strategies. Fundame...

Radiation protection is a topic of great public concern and of many scientific investigations, because ionizing radiation is an established risk factor for leukaemia and many solid tumours. Exposure of the public to ionizing radiation includes exposure to background radiation, as well as medical and occupational exposures. A large fraction of the e...

In a radiology department there are frequently asked questions associated with pregnant and breast feeding women. These are related to either pregnant patients or staff members or the questions are centered on the fetus as a patient. For pregnant patients the potential exposure to the mother and the fetus related to the imaging modality selected as...

QUALITY PROBLEM OR ISSUE: Long access times for magnetic resonance imaging (MRI) can negatively impact the quality of care provided to patients. We investigated improving access by reducing MRI processing time. Scheduling was adapted to utilize three expected total MRI processing times and IV placement was moved outside the scanner room. Planned ha...

PURPOSE To investigate the concordance of dual energy CT (DECT) iodine perfusion maps with parameter maps derived from pulmonary perfusion MRI. METHOD AND MATERIALS In this ongoing study 14 patients (10 men, 4 women, age range 20-81) with pulmonary perfusion defects detected on iodine perfusion maps of dual energy CTA additionally underwent time-r...

Exposure to ionizing radiation is a known risk factor for cancer. Cancer risk is highest after exposure in childhood. The computed tomography is the major contributor to the average, individual radiation exposure. Until now the association has been addressed only in statistical modeling. We present the first feasible study design on childhood cance...

Vendors of medical displays promise a better diagnostic performance using 10- or 11-bit instead of 8-bit monochrome displays. We measured the gain of "Just Noticeable Difference" (JND) steps using high grayscale resolutions and evaluated the preference of radiologists regarding different aspects of image quality. The amount of JND steps was measure...

Ziele: In der Metropolregion Rhein-Neckar existiert ein Teleradiologienetzwerk fur den einrichtungsubergreifenden Datenaustausch mittels DICOM E-Mail. Speziell die Installation, Konfiguration und Wartung der benotigten DICOM E-Mail Clients verlangt technisches Verstandnis, welches gerade niedergelassene Arzte selten haben und damit aus dem Netzwerk...

The Teleradiology/Emergency Medicine Network in the Metropolitan Rhine-Neckar Region (Germany) enables the exchange of medical data. However, the inclusion is difficult because of technical reasons for some partners like general practitioners. For that reason a web portal for the exchange of medical data within the Teleradiology/Emergency Medicine...

The texture of the pancreatic tissue is a main risk factor for leakage after pancreaticojejunostomy and can be differentiated using dynamic contrast enhanced magnetic resonance imaging (dMRI). In order to identify risk factors and to assess the role of pancreatic dMRI, a cohort of patients was retrospectively reviewed. One hundred seven consecutive...

Hintergrund: Der Arbeitsablauf (Workflow) in der Radiotherapie (RT) ist gegenwärtig durch neue Techniken und Behandlungsparadigmen wie intensitätsmodulierte Radiotherapie (IMRT) und zunehmende bildgestützte Radiotherapie (IGRT [„image-guided radiotherapy“]) im Umbruch. Daraus resultiert eine starke Zunahme von Daten verschiedener Datenklassen. Dies...

: Recent changes in the radiotherapy (RT) workflow through the introduction of complex treatment paradigms such as intensity-modulated radiotherapy (IMRT) and, recently, image-guided radiotherapy (IGRT) with their increase in data traffic for different data classes have mandated efforts to further integrate electronic data management for RT departm...

For a region-wide teleradiology network in Germany a vendor-independent Uptime-server concept was defined. The Uptime-server was realized for the availability check and prospective error-detection of the emergency teleradiology servers and clients based on encrypted digital imaging and communication in medicine (DICOM)-e-mail transfers. The concept...

PURPOSE In Germany, the measurement at viewing distance only, according to DIN 6868-57, is required when testing report monitors for quality assurance. This method requires expensive equipment and allows a combined quantification of both the emitted light from the monitor and reflected light from the display surface. Other methods (AAPM, IEC) rely...

For the connection of several partners to a Dicom-e-mail based teleradiology network concepts were developed to allow the integration of different teleradiology applications. The organisational and technical needs for such an integration were analysed. More than 60 institutions including 23 hospitals in the Rhein-Neckar-Region, Germany were connect...

Considering the real conditions in China, the strategy and scheme of DICOM-E-Mail's clinical applications in China are discussed in this paper.

The methods and techniques of teleradiology are used in numerous clinical specialties. Several teleradiology projects have been state-aided in Germany over the last 10 years. Using the teleradiology standard proposed by the German Radiology Society, some of these systems are also interoperable. Several techniques are available for realizing telerad...

Techniken und Methoden der Teleradiologie werden heute in vielen Fachgebieten eingesetzt und in einer Reihe von Landesprojekten ffentlich gefrdert. Durch die Verwendung der Empfehlung der DRG zur Teleradiologie sind einige dieser gefrderten Netze auch interoperabel. Zur Realisierung der Teleradiologie existiert eine Vielzahl von Techniken, wie Punk...

After the introduction of stereotactic precision radiotherapy and intensitymodulated radiation therapy (IMRT) on a broader scale in the late 1990s and early 2000s, the complexity of RT treatments has increased dramatically. Contrary to the US, where substantially raised reimbursement covered for the extra workload, in Europe these techniques were i...

Until recently there has been no standard for an interoperable and manufacturer-independent protocol for secure teleradiology connections. This was one of the main reasons for the limited use of teleradiology in Germany. Various teleradiology solutions have been developed in the past, but the vast majority have not been interoperable. Therefore an...

We present the case of a unique accumulation of complications 55 years after ureterosigmoidostomy for bladder exstrophy and discuss possible implications for follow-up strategies.

Die Teleradiologie ist ein Vorreiter der Telemedizin und inzwischen mit vielen Anwendungen etabliert, auch in der Onkologie. Während zeitkritische Notfallkonsultationen, insbesondere bei Schlaganfällen und Schädel-Hirn-Traumen, und eine Teleuntersuchungsbetreuung und -befundung (Teleradiologie nach RöV) die üblichen Hauptanwendungen darstellen, sin...

Einleitung und Zielsetzung Die Röntgenverordnung von 2002 erlaubt erstmalig explizit den Einsatz der Teleradiologie, bei der sich der befundende Radiologe räumlich entfernt vom zu untersuchenden Patienten aufhält, d.h. erstmalig ist hier nicht der fachkundige Arzt vor Ort gefordert. Die bisher existierenden telematischen Anwendungen, wie zum Beisp...

E-mail is ideal for ad-hoc connections in teleradiology. The DICOM standard offers the possibility to append DICOM data types as a MIME attachment to any e-mail, thus ensuring the transmission of the original DICOM data. Nevertheless, there are additional requirements (e.g. protection of data privacy) which must be obeyed. Because of the lack of gi...

Due to the lack of a standard for teleradiology, the IT Working Group (Arbeitsgemeinschaft für Informationstechnik, @GIT) of the German Radiological Society (Deutsche Röntgengesellschaft, DRG) has set up an initiative for standardizing telemedicine. E-mail has been selected as the ideal basis for ad hoc connections in teleradiology since it is both...

Teleradiologie per DICOM-E-Mail: Der empfohlene Minimalstandard der Deutschen Röntgenge-sellschaft. Aus: Steyer G, Tolxdorf T (eds). Proceedings Telemed 2005. bit for bit -Halbzeit auf dem Weg zur Telematikinfrastruktur. Berlin: Akademische Verlagsanstalt (2005) 102-107. (ISBN 3-89838-064-5) Mannheim 5) Ärztliche Stelle für Qualitätssicherung in de...

Electron beam tomography (EBT) has been scientifically evaluated to a much lesser degree for non-cardiac indications than for cardiac purposes. Therefore, four groups of investigators in Berlin (2), Mannheim and Munchen, which were supported by the Deutsche Forschungsgemeinschaft (DFG), included applications outside the heart in their evaluation of...

Der Einsatz der Elektronenstrahl-Computertomographie (EBT) außerhalb des Herzens ist im Vergleich zur Verwendung der EBT für kardiale Indikationen in viel geringerem Umfang Gegenstand der einschlägigen Forschung gewesen. Aus diesem Grund umfasste die von der Deutschen Forschungsgemeinschaft (DFG) unterstützte Evaluation dieser Technologie durch vie...

Purpose: A vendor-independent communication system was needed for a teleradiology project of the state of Baden-Württemberg, Germany to connect 13 hospitals. It should also be used for the statewide communication between 48 hospitals. Methods: A client–server solution was described using Dicom-e-mail with additional content encryption according to...

(1) To assess the impact of high intrathoracic pressure on left ventricular volume and function. (2) To test the hypothesis that right ventricular end-diastolic volume (RVEDV) and intrathoracic blood volume (ITBV) represent cardiac preload and are superior to central venous pressure (CVP) or pulmonary capillary wedge pressure (PCWP). The validity o...

Electron beam tomography (EBT) directly competes with other non-invasive imaging modalities, such as multislice computed tomography, magnetic resonance imaging, and echocardiography, in the diagnostic assessment of cardiac diseases. EBT is the gold standard for the detection and quantification of coronary calcium as a preclinical sign of coronary a...

Lung protective ventilation using low end-inspiratory pressures and tidal volumes (VT) has been shown to impair alveolar recruitment and to promote derecruitment in acute lung injury. The aim of the present study was to compare the effects of two different end-inspiratory pressure levels on alveolar recruitment, alveolar derecruitment and potential...

Numerous studies suggest setting positive end-expiratory pressure during conventional ventilation according to the static pressure-volume (P-V) curve, whereas data on how to adjust mean airway pressure (P(aw)) during high-frequency oscillatory ventilation (HFOV) are still scarce. The aims of the current study were to (1) examine the respiratory and...