1. A method for producing computed tomographic scans for planning radiation therapy for a patient in an unhealthy region, the method comprising:
determining a position and extent of the region and of the patient using computed tomographic scans;
choosing, using produced position data, an irradiation distribution which produces a most effective possible specific dose load for the unhealthy region and a lowest possible specific dose load for a remainder of the patient’s tissue, wherein the computed tomographic scans are produced on a lung of the patient moving cyclically through breathing, with motion information being taken from imaging projection data from the computed tomographic scans; and
selectively displaying at least two different cycle phases.
2. The method as claimed in claim 1, wherein the irradiation planning takes into account a positional shift in the unhealthy region as a result of the cyclic motion.
3. The method as claimed in claim 1, wherein the motion information from the CT data is detected by forming a two-dimensional location integral for the weakening coefficients.
4. The method as claimed in claim 1, wherein the motion information from the CT data is detected by virtue of projection-by-projection and row-by-row summation of direct projection data taking place.
5. The method as claimed in claim 1, wherein the motion information from the CT data is detected by virtue of projection-by-projection and row-by-row summation of direct projection data.
6. The method as claimed in claim 1, wherein the motion information from the CT data is detected by virtue of projection-by-projection and row-by-row difference value determination between direct projection data and complementary projection data with subsequent projection-by-projection and row-by-row summation of the difference values.
7. The method as claimed in claim 6, wherein, prior to the calculation, projection-by-projection interpolation of multirow direct projection data and of complementary projection data onto a common z position takes place.
8. The method as claimed in claim 1, wherein the motion information from the CT data is mapped as a global motion function over the scan time.
9. The method as claimed in claim 8, wherein bandpass filtering is applied to the global motion function.
10. The method as claimed in claim 1, wherein a CT image of a particular cycle phase is produced by using data from at least two cycles and from the same cycle phase.
11. The method as claimed in claim 1, wherein CT images of a multiplicity of cycle phases in the motion cycle are calculated.
12. The method as claimed in claim 1, wherein the data from particular cycle phases from a plurality of motion cycles are compiled prior to the calculation of incomplete CT image stacks.
13. The method as claimed in claim 1, wherein the data from particular cycle phases from a plurality of motion cycles are compiled after the calculation of incomplete CT image stacks.
14. The method as claimed in claim 1, wherein circular scanning takes place around the patient.
15. The method as claimed in claim 1, wherein spiral scanning takes place around the patient.
16. The method as claimed in claim 1, wherein parallel sorting of the measurement data takes place prior to the calculation.
17. A computed tomogram, comprising program means for implementing the method of claim 1.
18. The method as claimed in claim 2, wherein the motion information from the CT data is detected by forming a two-dimensional location integral for the weakening coefficients.
19. The method as claimed in claim 1, wherein the motion information from the CT data is detected by virtue of projection-by-projection and row-by-row summation of direct projection data in at least one of the row direction and channel direction of a multirow detector.
20. A computer program, adapted to carry out the method of claim 1, when run on a computer device.
21. A computer readable medium, including the computer program of claim 20.
22. A method, comprising:
determining a position and extent of an unhealthy region of a patient using computed tomographic scans;
choosing, using produced position data, an irradiation distribution which produces a relatively high effective dose load for the unhealthy region and a relatively low dose load for a remainder of the patient’s tissue, wherein the computed tomographic scans are produced on a lung of the patient moving cyclically through breathing, with motion information being taken from imaging projection data from the computed tomographic scans; and
selectively displaying at least two different cycle phases.
23. A device, comprising program means for implementing the method of claim 1.
24. A computer program, adapted to carry out the method of claim 22, when run on a computer device.
25. A computer readable medium, including the computer program of claim 24.
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 hand-manipulatable portable router, comprising:
a motor assembly for rotating a cutting tool;
a base for engaging a workpiece, wherein the base includes an aperture for allowing the cutting tool to pass therethrough to engage the workpiece;
a first rail and a second rail configured to permit the motor assembly and cutting tool to slide towards and away from the aperture to bring the cutting tool into and out of engagement with the workpiece; and
a first rolling element pair mounted to the motor assembly and a second rolling element pair mounted to the motor assembly, wherein:
the first rolling element pair includes two bearings and the second rolling element pair includes two bearings, each of the bearings having an outer ring, and
the outer ring on each of the two bearings in the first rolling element pair engages and rolls on the first rail and the outer ring on each of the two bearings in the second rolling element pair engages and rolls on the second rail.
2. The router of claim 1 further comprising a housing, wherein the first rail and the second rail are attached to inside walls of the housing.
3. The router of claim 2 wherein the housing comprises: a top member; and a base having an aperture, wherein the first rail and the second rail are attached at one end to the top member and at an other end to the base.
4. The router of claim 2 wherein the housing is of a fixed height.
5. The router of claim 1 wherein the first rail is parallel to the second rail.
6. The router of claim 1 wherein the two bearings of the first rolling element pair comprise a first ball bearing attached to the motor assembly and a second ball bearing attached to the motor assembly, the first ball bearing and the second ball bearing positioned to engage the first rail in a manner such that rotation axes of the first and second ball bearings are at a non-zero angle relative to one another.
7. The router of claim 6 wherein the two bearings of the second rolling element pair comprise a first ball bearing attached to the motor assembly and a second ball bearing attached to the motor assembly, the first ball bearing of the second rolling element pair and the second ball bearing of the second rolling element pair positioned to engage the second rail in a manner such that rotation axes of the first and second bearings of the second rolling element pair are at a non-zero angle relative to one another.
8. The router of claim 1 further comprising a third rolling element pair mounted to the motor assembly, wherein the third rolling element pair engages the first rail.
9. The router of claim 8 further comprising a fourth rolling element pair mounted to the motor assembly, wherein the fourth rolling element pair engages the second rail.
10. The router of claim 1 further comprising:
a housing comprising a top member and a base; and
at least one biasing member coupled to the motor assembly to bias the motor assembly towards the top member.
11. The router of claim 1 further comprising a split housing.
12. The router of claim 1 wherein the motor assembly comprises: a motor housing; a motor disposed in the motor housing, the motor comprising a shaft and the motor configured to impart rotation to the shaft; and a router tool holder coupled to the shaft.
13. A hand-manipulatable portable router, comprising:
a housing comprising a top member and a base having an aperture;
a motor assembly disposed in the housing;
a first rail operatively connected to the housing;
a first rolling element pair mounted to the motor assembly, wherein the first rolling element pair includes two bearings, each of the bearings having an outer ring and the outer ring on each of the two bearings engages and rolls on the first rail; and
at least one biasing member coupled to the motor assembly to bias the motor assembly towards the top member.
14. The router of claim 13 further comprising:
a second rail operatively connected to the housing; and
a second rolling element pair mounted to the motor assembly, wherein the second rolling element pair engages the second rail.
15. The router of claim 14 wherein the first rail is parallel to the second rail.
16. The router of claim 13 wherein the housing is a split housing.
17. The router of claim 16 wherein the split housing is secured together using at least one fastener.
18. The router of claim 13 wherein the housing is of a fixed height.
19. The router of claim 14 further comprising a third rolling element pair mounted to the motor assembly, wherein the third rolling element pair engages the first rail.
20. The router of claim 19 further comprising a fourth rolling element pair mounted to the motor assembly, wherein the fourth rolling element pair engages the second rail.
21. A hand-manipulatable portable router, comprising:
a housing;
a motor assembly for rotating a cutting tool and disposed in the housing;
a base for engaging a workpiece, wherein the base includes an aperture for allowing the cutting tool to pass therethrough to engage the workpiece;
a first rail operatively connected to the housing and configured to permit the motor assembly and cutting tool to slide towards and away from the aperture to bring the cutting tool into and out of engagement with the workpiece; and
means for slidably engaging the motor assembly with the first rail, wherein the means for slidably engaging the motor assembly with the first rail includes a first rolling element pair having two bearings, each of the bearings including an outer ring and the outer ring on each of the two bearings engages and rolls on the first rail.
22. The router of claim 21 further comprising:
a second rail operatively connected to the housing; and
means for slidably engaging the motor assembly with the second rail.
23. The router of claim 22 wherein the first rolling element pair is mounted to the motor assembly, and wherein the means for slidably engaging the motor assembly with the second rail comprises a second rolling element pair mounted to the motor assembly, wherein the first rolling element pair engages the first rail and the second rolling element pair engages the second rail.
24. The router of claim 23 wherein the means for slidably engaging the motor assembly with the first rail and the second rail further comprises a third rolling element pair mounted to the motor assembly, wherein the third rolling element pair engages the first rail.
25. The router of claim 24 wherein the means for slidably engaging the motor assembly with the first rail and the second rail further comprises a fourth rolling element pair mounted to the motor assembly, wherein the fourth rolling element pair engages the second rail.
26. The router of claim 21 wherein the housing is of a fixed height.