Nuklearmedizin 2019; 58(02): 182
DOI: 10.1055/s-0039-1683704
Poster
PET-MRT und Medizinische Physik
Georg Thieme Verlag KG Stuttgart · New York

Development and evaluation of a new high-resolution MWPC-based PET detector

K Bolwin
1   Universität Münster, European Institute for Molecular Imaging, Münster
,
B Gerke
1   Universität Münster, European Institute for Molecular Imaging, Münster
,
KP Schäfers
1   Universität Münster, European Institute for Molecular Imaging, Münster
› Author Affiliations
Further Information

Publication History

Publication Date:
27 March 2019 (online)

Also available at
 
 

    Ziel/Aim:

    The aim of this study was to develop and evaluate a MWPC detector build on an existing detector concept from a HIDAC small animal PET system. We will present the newly developed prototype detector and provide initial experimental results on count distribution as it compares to the existing HIDAC detectors.

    Methodik/Methods:

    An existing HIDAC PET was modified to build a sub-millimeter PET system by reducing the detector-to-detector distance from 180 mm to 40 mm and thereby reducing the influence of the non-collinearity effect. The spatial resolution of a MWPC in the non-wire direction is commonly limited by the gap (HIDAC, d = 1.5 mm) between two adjacent wires. To increase the spatial resolution in the non-wire direction, a new MWPC detector was developed that reduces the wire gap to 1 mm. To realize the geometry of a 1 mm gap the wire diameter was changed to 10 µm.

    Ergebnisse/Results:

    The new wire plane of the prototype detector was stable at high voltages. The measured anode and cathode signals were similar in shape and timing of the signals derived from regular modules. The interposer successfully transfers the 1.5 mm wire distance to a 1 mm wire distance without any observable oscillation or breakdown. The singles distribution of the new prototype detector shows a clear improvement in comparison to the HIDAC detector. It shows the predicted 1 mm pattern while it preserves a more homogeneous information on the entire readout area (Maximum to minimum value 0.8 vs. 0.4).

    Schlussfolgerungen/Conclusions:

    The prototype of a new module has been manufactured to reduce the wire-to-wire distance and thereby to improve the spatial resolution in non-wire direction. This should further improve the image-derived point source spatial resolution to a value of approximately 0.7 mm FWHM in all directions. The manufacturing of a second module is in progress to obtain a complete coincidence detector pair where the final image spatial resolution can be evaluated.


    #