DRR generation and enhancement using a dedicated graphics device
DRR generation and enhancement using a dedicated graphics device are described herein. In one embodiment, an example of a process for generating DRR (digitally reconstructed radiography) images includes, but is not limited to, loading a volume rendering program into a graphics device, the volume rendering program representing a predetermined algorithm according to a non-linear attenuation model. In response to 3D scan data, the graphics device is invoked to execute the volume rendering program to perform at least a portion of volume rendering operations on at least a portion of the 3D scan data, which may include modifying the 3D scan data according to the predetermined algorithm to compensate for a difference between a first attenuation of an object with respect to a second attenuation associating a known intensity of the object. Other methods and apparatuses are also described.
1. A computer implemented method for generating DRR (digitally reconstructed radiography) images, the method comprising:
loading a volume rendering program into a graphics device, the volume rendering program representing a predetermined algorithm according to a non-linear attenuation mode; and
in response to 3D scan data, invoking the graphics device to execute the volume rendering program to perform at least a portion of volume rendering operations on at least a portion of the 3D scan data, including modifying the 3D scan data according to the predetermined algorithm to compensate for a difference between a first attenuation of an object with respect to a second attenuation associating a known intensity of the object wherein the 3D scan data comprises a plurality of CT numbers representing an image intensity of corresponding 3D CT voxels, wherein each CT voxel represents a corresponding volume element of the object, and wherein each CT number represents an attenuated intensity of an X-ray CT beam that has been generated at a CT scan energy level and that has traversed the corresponding volume element of an anatomical region, wherein each CT voxel is disposed within one of a plurality of axial voxel slices, each axial voxel slice representing a corresponding axial slice of the object, wherein integrating the CT numbers comprises:
performing a tri-linear interpolation for the CT voxels encountered by the ray; and
for each voxel of interest, performing a one-dimensional polynomial interpolation over the voxel of interest and for voxels on each adjacent voxel slice.
2. A computer implemented method for generating DRR (digitally reconstructed radiography) images, the method comprising:
loading a volume rendering program into a graphics device, the volume rendering program representing a predetermined algorithm according to a non-linear attenuation model; and
in response to 3D scan data, invoking the graphics device to execute the volume rendering program to perform at least a portion of volume rendering operations on at least a portion of the 3D scan data, including modifying the 3D scan data according to the predetermined algorithm to compensate for a difference between a first attenuation of an object with respect to a second attenuation associating a known intensity of the object, wherein the at least a portion of the volume rendering operations is performed by the graphics device substantially in parallel with receiving the 3D scan data.
3. A machine-readable medium having executable code to cause a machine to perform a method for generating DRR images, the method comprising:
loading a volume rendering program into a graphics device, the volume rendering program representing a predetermined algorithm according to a non-linear attenuation model; and
in response to 3D scan data, invoking the graphics device to execute the volume rendering program to perform at least a portion of volume rendering operations on at least a portion of the 3D scan data, including modifying the 3D scan data according to the predetermined algorithm to compensate for a difference between a first attenuation of an object with respect to a second attenuation associating a known intensity of the object, wherein the 3D scan data comprises a plurality of CT numbers representing an image intensity of corresponding 3D CT voxels, wherein each CT voxel represents a corresponding volume element of the object, and wherein each CT number represents an attenuated intensity of an X-ray CT beam that has been generated at a CT scan energy level and that has traversed the corresponding volume element of an anatomical region, wherein each CT voxel is disposed within one of a plurality of axial voxel slices, each axial voxel slice representing a corresponding axial slice of the object, wherein integrating the CT numbers comprises:
performing a bi-linear interpolation for the CT voxels encountered by the ray; and
for each voxel of interest, performing a one-dimensional polynomial interpolation over the voxel of interest and for voxels on each adjacent voxel slice.
4. A machine-readable medium having executable code to cause a machine to perform a method for generating DRR images, the method comprising:
loading a volume rendering program into a graphics device, the volume rendering program representing a predetermined algorithm according to a non-linear attenuation model; and
in response to 3D scan data, invoking the graphics device to execute the volume rendering program to perform at least a portion of volume rendering operations on at least a portion of the 3D scan data, including modifying the 3D scan data according to the predetermined algorithm to compensate for a difference between a first attenuation of an object with respect to a second attenuation associating a known intensity of the object, wherein the at least a portion of volume rendering operations is performed by the graphics device substantially in parallel with receiving the 3D scan data.