1. An apparatus for extending the effective field of view (FOV) of a computer tomography (CT) scanner, comprising:
a storage medium that stores an image mask and stores acquired CT projection transmission data of said CT scanner to be used in calculating image reconstruction data; and
a processor that performs a direct inversion data calculation using said CT projection transmission data defined by said image mask to obtain image reconstruction data for a reconstructed CT image,
wherein the calculation uses the image mask and image center as one boundary; and
wherein the reconstructed CT image includes areas outside the image mask and outside the CT scanner FOV.
2. An apparatus for extending the effective field of view (FOV) of a computer tomography (CT) scanner, comprising:
a storage medium that stores an image mask and stores acquired CT projection transmission data of said CT scanner to be used in calculating image reconstruction data; and
a processor that performs an iterative reconstruction data calculation using said CT projection transmission data defined by said image mask to obtain image reconstruction data for reconstruction of a reconstructed CT image,
wherein the calculation uses the image mask and image center as one boundary; and
wherein the reconstructed CT image includes areas outside the image mask and outside the CT scanner FOV.
3. The apparatus of claim 2, wherein said iterative reconstruction data calculation is performed for a pre-selected number of iterations.
4. The apparatus of claim 2, wherein said iterative reconstruction data calculation is performed until a calculation result is within a pre-selected tolerance level of a preceding calculation result.
5. The apparatus of claim 1, wherein said processor further uses said CT image reconstruction data to develop attenuation correction factors for PET projection data acquired from the same object as said CT projection data.
6. The apparatus of claim 1, wherein said processor further co-registers said CT image reconstruction data with PET reconstruction data pertaining to the same object as said CT image reconstruction data.
7. The apparatus of claim 2, wherein said processor further uses said CT image reconstruction data to develop attenuation correction factors for PET projection data acquired from the same object as said CT projection data.
8. The apparatus of claim 2, wherein said processor further co-registers said CT image reconstruction data with PET reconstruction data pertaining to the same object as said CT image reconstruction data.
9. An apparatus for extending the effective field of view (FOV) of a computer tomography (CT) scanner, comprising:
a storage medium that stores an image and stores acquired CT projection transmission data to be acquired as CT projection data and storing a reconstruction mask for acquired CT projection data surrounding a FOV of said CT scanner to be used in calculating image reconstruction data; and
a processor that performs an iterative reconstruction data calculation using said CT projection data defined by said projection data mask and said reconstruction mask to obtain image reconstruction data for reconstruction of a CT image,
wherein the calculation uses the image mask and image center as one boundary; and
wherein the reconstructed CT image includes areas outside the image mask and outside the CT scanner FOV.
10. The apparatus of claim 9, wherein said iterative reconstruction data calculation is performed for a pre-selected number of iterations.
11. The apparatus of claim 9, wherein said iterative reconstruction data calculation is performed until a calculation result is within a pre-selected tolerance level of a preceding calculation result.
12. The apparatus of claim 9, wherein said projection data mask includes projection data in a predetermined area surrounding said FOV.
13. The apparatus of claim 9, wherein said reconstruction mask includes projection data from truncated areas in said predetermined area surrounding said FOV.
14. The apparatus of claim 9, wherein said processor further uses said CT image reconstruction data to develop attenuation correction factors for PET projection data acquired from the same object as said CT projection data.
15. The apparatus of claim 9, wherein said processor further co-registers said CT image reconstruction data with PET reconstruction data pertaining to the same object as said CT image reconstruction data.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A digital broadcasting data receiving apparatus, comprising:
a packet input section configured to input a packet having a program clock reference value related to digital broadcasting;
a decode section configured to decode the packet input by the packet input section;
a system time clock reproducing section configured to reproduce a system time clock used for a synchronizing process executed in the decode section; and
a system time clock control section configured to control the system time clock reproducing section to correct the system time clock reproduced by the system time clock reproducing section in accordance with a difference between the value of the system time clock and the program clock reference value.
2. The digital broadcasting data receiving apparatus according to claim 1, wherein the value of the system time clock is placed at a head of the input packet.
3. The digital broadcasting data receiving apparatus according to claim 1, wherein:
the input packet has a header section and an adaptation or payload section, and
the value of the system time clock is placed between the head section and the adaptation or payload section.
4. The digital broadcasting data receiving apparatus according to claim 1, wherein the value of the system time clock is placed at a tail of the input packet.
5. The digital broadcasting data receiving apparatus according to claim 1, wherein a field of a predetermined byte length is added to the input packet, the field including the value of the system time clock and reserved bits.
6. The digital broadcasting data receiving apparatus according to claim 5, wherein the reserved bits are placed in front of the value of the system time clock.
7. The digital broadcasting data receiving apparatus according to claim 5, wherein the reserved bits are placed behind the value of the system time clock.
8. The digital broadcasting data receiving apparatus according to claim 5, wherein:
the value of the system time clock is divided into a system time clock base section and a system time clock extension section in placement, and
the reserved bits are placed between the system time clock base section and the system time clock extension section.
9. A method of controlling a digital broadcasting data receiving apparatus including a packet input section which inputs a packet having a program clock reference value related to digital broadcasting and a decode section which decodes the packet input by the packet input section, the method comprising:
in the packet input section, reproducing a system time clock used for a synchronizing process executed in the decode section,; and
in the decode section, correcting the system time clock reproduced in the packet input section in accordance with a difference between the value of the system time clock and the program clock reference value.
10. The method according to claim 9, wherein the value of the system time clock is placed at a head of the input packet.
11. The method according to claim 9, wherein:
the input packet has a header section and an adaptation or payload section, and
the value of the system time clock is placed between the head section and the adaptation or payload section.
12. The method according to claim 9, wherein the value of the system time clock is placed at a tail of the input packet.
13. The method according to claim 9, wherein a field of a predetermined byte length is added to the input packet, the field including the value of the system time clock and reserved bits.
14. The method according to claim 13, wherein the reserved bits are placed in front of the value of the system time clock.
15. The method according to claim 13, wherein the reserved bits are placed behind the value of the system time clock.
16. The method according to claim 13, wherein:
the value of the system time clock is divided into a system time clock base section and a system time clock extension section in placement, and
the reserved bits are placed between the system time clock base section and the system time clock extension section.
17. A digital broadcasting data receiving apparatus, comprising:
a packet input section configured to input a packet having a program clock reference value related to digital broadcasting;
a decode section configured to decode the packet input by the packet input section;
a system time clock reproducing section provided in the packet input section and configured to reproduce a system time clock used for a synchronizing process executed in the decode section;
a buffer provided in the packet input section and configured to temporarily store the input packet with a value of the reproduced system time clock to output the stored packet with the value of the system time clock; and
a system time clock control section provided in the decode section and configured to extract the value of the system time clock and the program clock reference value from the packet output by the buffer and configured to control the system time clock reproducing section to correct the system time clock reproduced by the system time clock reproducing section in accordance with a difference between the value of the system time clock and the program clock reference value.