A voucher is a bond of the redeemable transaction type which is worth a certain monetary value and which may be spent only for specific reasons or on specific goods.
In 1985 a robot, the Unimation Puma 200, was used to place a needle for a brain biopsy using CT guidance. In 1992, the PROBOT, developed at Imperial College London, was used to perform prostatic surgery by Dr. Senthil Nathan at Guy's and St Thomas' Hospital, London. This was the first pure robotic surgery in the world.
As Dr. Stein discovered, DXA reduced scan. times, delivered higher spatial resolution, allowed for the same. measurements that were achieved with DPA, precision was. within 1 to 2 percent, and dose was minimal to both patient. and operator. In 1987 Hologic introduced the first bone.