Positron emission tomography (PET)-scanning device

A positron emission tomography (PET)-scanning device comprising:

• a detector ring for detecting emitted PET-radiation;
• and
• a main supporting structure to which is attached a U-shaped portion with two arms for holding the detector ring between the arms;
• wherein the detector ring is held by the two arms and configured so that the detector ring is rotatable about an axis of rotation that extends through the U-shaped portion through the two arms of the U-shaped portion,
• wherein the main supporting structure comprises a guide rail to which the U-shaped portion is attached so that the U-shaped portion is displaceable along the guide rail, and
• wherein the guide rail extends along an inclined direction relative to the direction of gravity, wherein the inclined direction is at an angle that is neither parallel nor perpendicular to the direction of gravity.