Manfred Zinke

Phase matching in symmetrical single‐mode magneto‐optic waveguides by application of stress

Tuning of the propagation constant difference Δβ=βTM−βTE in single‐mode symmetrical yttrium iron garnet (YIG) film waveguides over a range of 250°/cm by means of external stress is demonstrated. An a posteriori, precise setting of phase match Δβ→0, which is a precondition for nonreciprocal mode coupling type components, can be achieved by this method.

An MR-compatible singles detection and processing unit for simultaneous preclinical PET/MR

Improving PET performance towards higher resolution and better sensitivity resulted in a continuous trend - especially in solid state PET and PET/MR - of an increasing number of channels to be read out by the detector electronics. Building complete PET systems with these detectors calls for a modular and self-triggered architecture with distributed processing power that is already in the detector module able to condense the data stream to corrected and gated singles.

FPGA-based singles and coincidences processing pipeline for integrated digital PET/MR detectors

In this paper, we propose an FPGA-based Data Acquisition and Control Architecture (DACA) with distributed processing capabilities for future PET-systems suitable for simultaneous PET-MRI operation, which can be configured to future detector geometries and crystal configurations of any preclinical and clinical PET system. Key-aspects for such an architecture are a scalable and modular infrastructure with common communication blocks for every processing node, a common interface for processing pipelines, bypass of raw detector data and a system-wide message-based data routing with modular addressing scheme. We present general conceptual aspects and implementations for the preclinical PET-Insert Hyperion-I as proposed by Schulz et at. and Hyperion-UD as proposed by Weissler et al., followed by initial throughput measurements of a PET-module, which demonstrates a linear response behavior of our FPGA-based architecture within the aimed data rates of up to 930Mbits/s.

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference

In this paper, we propose an FPGA-based Data Acquisition and Control Architecture (DACA) with distributed processing capabilities for future PET-systems suitable for simultaneous PET-MRI operation, which can be configured to future detector geometries and crystal configurations of any preclinical and clinical PET system. Key-aspects for such an architecture are a scalable and modular infrastructure with common communication blocks for every processing node, a common interface for processing pipelines, bypass of raw detector data and a system-wide message-based data routing with modular addressing scheme. We present general conceptual aspects and implementations for the preclinical PET-Insert Hyperion-I as proposed by Schulz et at. and Hyperion-UD as proposed by Weissler et al., followed by initial throughput measurements of a PET-module, which demonstrates a linear response behavior of our FPGA-based architecture within the aimed data rates of up to 930Mbits/s.

Non-Reciprocal Waveguides

Materials and growth processes for magneto-optic garnet film wavequides are described. The realization and characterization of single-mode waveguide structures is explained, and experimental methods for the investigation of the non-reciprocal mode conversion are discussed. Applications for waveguide isolators are briefly mentioned.