Søren Baarsgaard Hansen, September 2020 

The HRRT (High Resolution Research Tomograph) was developed by Siemens (former CTI) as a dedicated brain scanner for research, and has been installed at major research institutions worldwide. Most remarkable the system offers an outstanding spatial resolution around 2 mm compared to typically 4 mm for modern clinical whole-body scanners. This very high spatial sampling has been achieved by incorporating both quadrant sharing and depth-of-interaction detector technology. Data are acquired in list-mode for maximum flexibility regarding post scanning data processing of dynamic studies. Attenuation correction is based on transmission scans using a 137Cs point source. The software is partly developed in collaboration between the various HRRT centers, and includes many processing options as well as reconstruction algorithms like FBP, OSEM, and OSEM with point spread modeling (PSF). Data processing also includes image based motion correction, which in particular is to the benefit for longer dynamic studies. Apart from human heads, the HRRT is very suitable for scanning medium-sized animals like rats, rabbits and pigs.

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Photo: Tonny Foghmar

Revised: 25 September 2020