xDSL - Computer Definition. Referring to any of a group of broadband digital access technologies operating over embedded unshielded twisted pair (UTP) telco local loops. xDSL technologies employ sophisticated compression algorithms and multiplexing techniques to derive performance that often exceeds 1 Mbps over a voice grade local loop. Most DSL technologies support simultaneous voice and high speed Internet access, and a number support video, as well.
Osseous structures means bony structures and in thorax it includes ribs,vertebra, clavicle. It is normal in your case. There is no abnormality in bones. There is some problem in perfusion study and in your case it is due to ischemic(decreased blood supply to part of heart)insult.
Osteons, or the structure that forms compact bone, surround these canals and are the outer component of the haversian system. The terms osteons and haversian system are often used interchangeably. Haversian systems are units of structure within mature bone. The systems run parallel to the long axis of bones. Each cylindrical unit within compact bone is an entire haversian system. The system includes lamellae, osteocytes, lacunae, canaliculi and a haversian canal. Lamellae are the thin layers that compile and eventually form bone. They contain collagen fibers that are arranged in a parallel array.