Abstract: The present invention provides a projection method of 3D ray tracing, so as to construct a geometric factor required for the reconstruction of a medical image in the imaging field. The present invention mainly projects a radiation field and a voxel detected by each detector on two 2D planes, then calculates the geometric ratio of a rectangular unit, corresponding to each voxel on the two 2D planes, to the radiation field, respectively, and multiplies the geometric ratios to obtain a sub-geometric factor with respect to the voxel. The sub-geometric factors gij of all voxels i corresponding to all detectors j are combined to form a geometric factor matrix Gij.

Abstract: A tomographic scanning apparatus for scanning an object under test and retrieving projection-related data of the object with a light/radiation source and a detector operating in conjunction therewith includes an object carrier, a light/radiation source carrier, a detector carrier, a control module, a processing module, and a rail system (or rotating arm). The object carrier is disposed at a center of the rail system or a center of rotating tracks of the rotating arm. The light/radiation source carrier and the detector carrier move along a rail of the rail system or along the rotating tracks of the rotating arm. The carriers have a rotating mechanism, moving mechanism, and/or height adjusting mechanism for performing rotation, horizontal movement, and/or height adjustment. Accordingly, the tomographic scanning apparatus operates in various ways to suit various applications, respectively.

Abstract: An apparatus for X-ray photography includes a first X-ray source, a first driving device, and an image detecting device. The first X-ray source has a light emitting end, provided with a block element. The first X-ray source generates an X-ray beam, and the block element is used for constraining a projection field of the X-ray beam, so that the X-ray beam has a first boundary. The X-ray beam is cast onto an object, and the object has a reference center and an imageable area. The first driving device is used for driving the first X-ray source to rotate around the object within an angle range with the reference center of the object as a center, so that when the first X-ray source is located at a first position, the first boundary passes through the reference center.

Abstract: A tomographic scanning apparatus for scanning an object under test and retrieving projection-related data of the object with a light/radiation source and a detector operating in conjunction therewith includes an object carrier, a light/radiation source carrier, a detector carrier, a control module, a processing module, and a rail system (or rotating arm). The object carrier is disposed at a center of the rail system or a center of rotating tracks of the rotating arm. The light/radiation source carrier and the detector carrier move along a rail of the rail system or along the rotating tracks of the rotating arm. The carriers have a rotating mechanism, moving mechanism, and/or height adjusting mechanism for performing rotation, horizontal movement, and/or height adjustment. Accordingly, the tomographic scanning apparatus operates in various ways to suit various applications, respectively.

Abstract: The present invention provides a projection method of 3D ray tracing, so as to construct a geometric factor required for the reconstruction of a medical image in the imaging field. The present invention mainly projects a radiation field and a voxel detected by each detector on two 2D planes, then calculates the geometric ratio of a rectangular unit, corresponding to each voxel on the two 2D planes, to the radiation field, respectively, and multiplies the geometric ratios to obtain a sub-geometric factor with respect to the voxel. The sub-geometric factors gij of all voxels i corresponding to all detectors j are combined to form a geometric factor matrix Gij.

Abstract: An apparatus for X-ray photography includes a first X-ray source, a first driving device, and an image detecting device. The first X-ray source has a light emitting end, provided with a block element. The first X-ray source generates an X-ray beam, and the block element is used for constraining a projection field of the X-ray beam, so that the X-ray beam has a first boundary. The X-ray beam is cast onto an object, and the object has a reference center and an imageable area.

Abstract: The present invention provides a method for calibrating the crystal-level detection efficiency, which is capable of evaluating the influences caused by the penetration effect of the crystals of a scintillation detector so as to calculate the difference of detection efficiency between crystals correctly and thereby calibrate the difference between crystals appropriately such that the quality of the imaging result is improved accordingly. The method of present invention is simple without modifying the hardware design and consequently the design cost, manpower cost and time cost can be reduced.

Abstract: The present invention provides a method for calibrating the crystal-level detection efficiency, which is capable of evaluating the influences caused by the penetration effect of the crystals of a scintillation detector so as to calculate the difference of detection efficiency between crystals correctly and thereby calibrate the difference between crystals appropriately such that the quality of the imaging result is improved accordingly. The method of present invention is simple without modifying the hardware design and consequently the design cost, manpower cost and time cost can be reduced.