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A nuclear scanner includes an annular support structure (32) which supports a plurality of detector modules (30). Each detector module includes a cooling and mounting structure (34) to which a plurality of tiles (40) are mounted by passing pins (46-49) through holes (38) in the cooling and mounting

A nuclear scanner includes an annular support structure (32) which supports a plurality of detector modules (30). Each detector module includes a cooling and mounting structure (34) to which a plurality of tiles (40) are mounted by passing pins (46-49) through holes (38) in the cooling and mounting structure (34) to position each tile and thermally connect each tile to the cooling and mounting structure (34). A tile mount (44) on the side of the tile that makes contact with the cooling and mounting structure has a smooth face to make contact with the cooling and mounting structure to provide good thermal contact between the tile (40) and the cooling and support structure (34).

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1. A tile configured to be assembled with like tiles into an array to form a detector for positron emission tomography (PET), the tile comprising: an array of radiation detectors and associated electronics which are configured to generate signals in response to receiving radiation events;a mount whi

1. A tile configured to be assembled with like tiles into an array to form a detector for positron emission tomography (PET), the tile comprising: an array of radiation detectors and associated electronics which are configured to generate signals in response to receiving radiation events;a mount which is configured to mount the tile to and in thermal communication with a cooling and mounting structure and which is configured to position a mounting face of the tile relative to the cooling and mounting structure. 2. The tile according to claim 1, wherein the mount includes: a plurality of pins configured to extend through holes in the cooling and mounting structure such that the tile is removable from the cooling and mounting structure by pushing the pins from A rear of the cooling and mounting structure. 3. The tile according to claim 2, wherein at least some of the pins are threaded to receive a nut. 4. The tile according to claim 2, whereinthe array of radiation detectors includes an electrical connector disposed facing the mount; andthe mount has an aperture aligned with the electrical connector, such that the electrical connector is accessible from the rear of the cooling and mounting structure through the mount aperture and an aligned cooling and mounting structure aperture. 5. The tile according to claim 4, wherein the mount defines a flat contact surface configured to thermally contact a complimentary surface of the cooling and mounting structure. 6. The tile according to claim 1 further including: feet or spacers disposed on a surface of the tile which contacts the cooling and mounting structure. 7. The tile according to claim 1, wherein the array of radiation detectors includes an electrical connector disposed facing the mount; andthe mount has an aperture aligned with the electrical connector, such that the electrical connector is accessible from a rear of the cooling and mounting structure through the mount aperture and an aligned cooling and mounting structure aperture. 8. The tile according to claim 1 wherein the radiation detectors include one of: scintillation crystals optically connected with silicon photomultipliers; andsolid state radiation detectors. 9. A radiation detection module comprising: a cooling and mounting structure defining an array of pin receiving holes and apertures;an array of thermally conductive mounts having pins configured to be received in the pin receiving holes of the cooling and mounting structure and having mount apertures that align with the cooling and mounting structure apertures when the mount pins are received in the cooling and mounting structure holes, such that when the pins are received in the holes, the mount has a contact surface in thermal contact with a complementary surface of the cooling and mounting structure and the pins extend through the cooling and mounting structure holes;an array of radiation detectors mounted to and in thermal contact with each of the mounts to define a tile, the array of radiation detectors including an electrical connector which is accessible through the mount and cooling and mounting structure apertures when the mount pins are received in the cooling and mounting structure holes, wherein the tiles are in a closely packed array with limited access to sides of the tiles making removal of an individual one of the tiles from a detector side without damaging the tile or neighboring tiles tenuous, such that one of the tiles is replaceable by disconnecting electrical connections from the electrical connector via aligned mount and cooling and mounting structure apertures and pressing the pins extending through the cooling and mounting to eject the one of the tiles. 10. The module according to claim 9 further including: a thermal paste or elements disposed between the tiles and the cooling and mounting structure. 11. The module according to claim 9, wherein the cooling and mounting structure defines more electrical connector apertures and holes for receiving tile mounting pins than the number of mounted tiles such that additional tiles can be added later to enlarge an examination region. 12. A PET scanner comprising: an annular support structure; anda plurality of radiation detector modules according to claim 9. 13. The PET scanner according to claim 12 wherein the annular support structure includes: a pair of rings on which the modules are mounted and wherein the cooling and mounting structure defines more electrical connector apertures and holes for receiving tile mounting pins than the number of mounted tiles; anda spacer assembly in a space between the tiles and one of the detector rings which blocks the tiles from receiving oblique radiation, the spacer assembly including a movable shield ring adjacent to the detector modules, a support ring, and a spacer disposed between the movable shield ring and the support ring. 14. A method of mounting a radiation detector array comprising: fashioning a plurality of tiles, each tile including: a thermally conductive mount having a plurality of extending pins and an aperture,an array of radiation detectors mounted on and thermally connected with the mount, the array including an electrical connector aligned with the mount aperture to be accessed therethrough;mounting each of the plurality of tiles in a cooling and mounting structure including: inserting the pins of each tile through corresponding holes of the cooling and mounting structure such that the pins extend through to a rear of the cooling and mounting structure and such that complementary surfaces of the tile and the cooling structure are brought into thermal contact and such that the mount apertures align with corresponding cooling and mounting structure apertures and such that the tiles are closely spaced with limited access to sides of adjoining tiles;attaching electrical wiring to the electrical connector from the rear of the cooling and mounting structure through the cooling and mounting structure and mount apertures. 15. The method according to claim 14 further including: removing one tile of the plurality of tiles from the cooling and support structure to repair, align or replace the tile including: disconnecting the electrical wiring from the connector of the one tile from the rear of the cooling and mounting structure,pushing the pins of the one tile from the rear of the cooling and mounting structure to eject the one tile; andmounting a replacement tile on the cooling and support structure. 16. A generally annular PET detection system comprising: a plurality of annular support rings;a plurality of the radiation detection modules mounted to the annular support rings, each module including a cooling and mounting structure defining an array of pin receiving holes and an array of apertures and a plurality of tiles, each tile including: thermally conductive mounts having pins configured to be received in the pin receiving holes of the cooling and mounting structure and having an aperture that aligns with one of the cooling and mounting structure apertures when the pins are received in the holes,an array of radiation detectors mounted to and in thermal contact with the mount, the array of detectors including an electrical connector disposed to be accessed through the aligned mount and cooling and mounting structure apertures. 17. A generally annular PET detection system comprising: a pair of annular support rings;a first annular shield ring disposed adjacent a first of the annular support rings;a plurality of modules mounted to and supported by the annular support rings, each module including a cooling and support plate assembly which defines electrical connector apertures;a plurality of tiles, each tile comprising a detector and an electrical connector on or recessed in a face of the tile such that the electrical connector aperture receives the electrical connector, each tile mounted to and supported by the cooling and support plate assembly of the respective module, the cooling and support plate assembly defining more electrical connector apertures than the number of mounted tiles such that different numbers of tiles can be mounted to the respective module in a group with a first side of the group adjacent the first annular shield ring; anda moveable annular shield ring mounted between a second of the annular support rings and the plurality of tiles such that the movable annular shield ring is positioned adjacent a second side of the group of tiles such that the movable annular shield ring can be disposed to accommodate different numbers of tiles.