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For full quantification it is necessary to calibrate the twilite, e.g. the counts per second units of the twilite output have to be converted to the units of the PET scanner or another instrument measuring the radioactivity in the target organ. Prerequisite for such a calibration is that the geometry of the catheter loop in the twilite measuring head is exactly the same as in the experiment. To assure this, the loop inside the measuring head is guided by a precision template which Swisstrace delivers for every catheter diameter.