Figure 1.

Patient positioning and the wrist immobilizer; (a) the subject is lying on the extremity positron emission tomography (PET)/CT system with the arm bent at the elbow inserted into the scanner bore through a hole in the table top; (b) the patient-specific wrist and hand immobilizer constructed from the thermoplastic material (white mesh), which attaches a custom-sized medical-grade styrofoam piece (light blue) by the means of nylon screws (visible locations demarcated by black dots); (c) the immobilizer inside the PET/CT gantry locked in place on the centre post by means of customized nylon stoppers. The PET and CT systems are rotated around the immobilized wrist and hand for image acquisition; and (d) the immobilizer is locked in a radiofrequency coil by a supporting apparatus that located the wrist and hand close to the isocentre of the coil. For colour image see online.