|Thesis title:||Development Of A High Resolution Anger Camera For Nuclear Imagingapplications|
|Research area:||Sensors and instrumentation|
Silicon Drift Detectors, SDDs, have recently shown to be a competitive device for the readout of scintillators. When coupled to CsI:Tl scintillator, SDDs have shown to achieve both good energy resolution and a sub-millimeter position resolution in -ray imaging. This work regards the development of new Anger camera based on SDD. Good results are obtained in the last years thanks to the DRAGO (DRift Array-based Gamma camera for Oncology) project, led by Politecnico of Milan, which regards the development of a high-resolution Anger camera based on a monolithic array of 77 SDDs, with an active area of 6.7 cm2, coupled to a CsI:Tl scintillator crystal. This camera has shown a resolution of 0.35mm FWHM, and uniform imaging capabilities over its field-of-view, with potential applications in the field of small animal imaging and intraoperative probes. To cover larger format of Anger cameras to be used especially for human imaging, arrays of SDDs of larger active areas are employed in the framework of the HICAM (HIgh resolution CAMera) project, supported by European Community. The new camera, under development, is composed of 100 SDDs of 1cm2 each, in a 10x10cm2 format, and would represent the largest gamma-ray imager based on SDDs developed so far and is foreseen to be employed in medical imaging applications where high-position resolution and camera compactness are of primary concern. The Hicam camera will be characterized by: high intrinsic spatial resolution, < 1mm, and high overall spatial resolution, ~ 2.5mm@5cm; energy resolution: < 15%@140keV; compactness and ease of positioning of the detector head ; compatibility with large magnetic field for the possible integration with MRI instrumentation.Due to the intrinsic insensitivity of the SDDs to magnetic fields, the HICAM camera has potentialities to be used also in combination with MRI. Thus, this category of gamma camera opens new and important possibilities for the research and for future projects.