Isodose


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Isodose

 

isodose curve (radiobiology), the line on a diagram of the irradiation of an organism that connects the points of the irradiated organism at which identical doses of ionizing radiation have been absorbed. A series of such lines makes possible a graphic representation of the way in which the absorbed dose decreases in the body tissues along the path of the rays. Isodose diagrams are usually used in radiation therapy of malignant tumors to calculate how to apply the largest possible dose to the

tumor with maximum protection of the surrounding tissues.

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Caption: FIGURE 5: MCPX model and isodose curves in % representation of XY view of the gamma dose rate distribution in the GB-127 source.
Approximately pear shape isodose curves were obtained for both applicators.
A total of 11 TLD chips were irradiated with 100 cGy in 3 birds with 100% isodose line.
Display of dose lines: Fig.2 shows isodose lines of center layer in treatment plan of one patient.
The Cyberknife delivers isodose profiles directly to the prostate tumor, utilizing 1) a rapid dose fall-off for adjacent non-target structures and 2) real-time image guidance during radiation delivery to correct for the translational and rotational changes in the prostate gland position.
The median marginal dose to the schwannoma was 13Gy (range 8-20), maximum dose to the schwannoma was 24Gy (range 16-40), and median 50% isodose line was 50% (range 15-100).
Surprisingly, measurement trends for dosimeters from the unprotected group diverged from each other even within an isodose group.
Isodose distribution is reviewed and optimized on visualizing dose distribution to the target as well as critical structures.
Radiation oncologists can use Mobile MIM to review dose volume histograms, isodose curves, contours, and images for treatment plans actions commonly restricted to a limited number of dedicated workstations.
This could be much faster and more accurate than the radiation isodose plotting that was required in the earlier days of civil defense operations, in which human monitors were needed to go into radiation fields and radio back their readings as they walked through designated areas.
A total of 61.2 Gy was delivered in 34 fractions, with the treatment dose normalized to a 90% maximum isodose line.