Therapy treatment planning by radiation dose determination

Details Therapy treatment planning by radiation dose determination Therapy treatment planning by radiation dose determination

1985-07-19

1988-03-01

Smith, Jerry

Boots, shoes, and leggings

G01T 102, A61N 510, G06F 1542

Patent

active

047290994

ABSTRACT:
A differential scatter-air ratio calculation procedure is utilized to calculate scatter contribution which when combined with primary radiation yields patient dose. The lengthy polar coordinate integration of the prior art is replaced with a rectangular coordinate integration which to an extent can be performed outside an integration loop. Beam characteristics are entered into a one dimensional matrix BWP. A second matrix RSAR includes the differential scatter air ratio for incremental regions within the patient at a certain depth and radial distance from a scatter calculation point. During a rectangular coordinate integration, a two dimensional coordinate within a patient plane determines an offset into both the one dimensional beam characteristic matrix BWP and the differential scatter-air ratio matrix RSAR. Then values are multiplied to produce a scatter contribution from the incremental region.

REFERENCES:
patent: 3871579 (1975-03-01), Inamura
patent: 3987281 (1976-10-01), Hodes
patent: 4455609 (1984-06-01), Inamura et al.
European patent publication No. 212,793, search report, based on application No. 86304579, published Mar. 4, 1987.
Mohan, R. et al., "Validity of the Concept of Separating Primary and Scatter Dose", Med. Phys., vol. 12, No. 6, 1985, 726-730.
Altschuler, M. D. et al., "A Clinically Operational Method for Three-Dimensional Dose Calculations", Phys. Med. Biol., vol. 30, No. 3, 1985, 217-228.
Iwasaki, A. et al., "The Differential Scatter-Air Ratio and Differential Backscatter Factor Method Combined with the Density Scaling Theorem", Med. Phys., vol. 11, No. 6, 1984, 755-763.
Battista, Jerry J. et al., "Computed Tomography for Radiotherapy Planning", Radiation Oncology-Biology-Physics, vol. 6, 1980, 99-107.
Cunningham, J. R. et al., "Program Irreg-Calculation of Dose from Irregularly Shaped Radiation Beams", Computer Programs in Biomedicine 2, 1972, 192-199.
Cunningham, J. R., "Scatter-Air Ratios", Phys. Med. Biol., vol. 17, No. 1, 1972, 42-51.
Day, M. J., "A Note on the Calculation of Dose in X-Ray Fields", British Journal of Radiology, vol. XXIII, No. 270, 1950, 368-369.
Larson, Kenneth B. et al., "Absorbed-Dose Computations for Inhomogeneous Media in Radiation-Treatment Planning Using Differential Scatter-Air Ratios", IEEE, 1978, 93-99.
Sontag, Marc R. et al., The Equivalent Tissue-Air Ratio Method for Making Absorbed Dose Calculations in a Heterogeneous Medium, Radiology, vol. 129, No. 3, 1978, 787-794.

Affiliated with

Also associated with

Rating

Therapy treatment planning by radiation dose determination does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Therapy treatment planning by radiation dose determination, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Therapy treatment planning by radiation dose determination will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1003064