Hyperfractionation
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Increase in the number of fractions and reduction in dose per fraction in
the same overall time
Delivers smaller than standard fractional doses (100-120 cGy).
2-3 times per day.
4-6 hour intervals.
Overall treatment time remains the same 6-8 weeks.
Total dose increase by 10-20%.
Standard Set of Conditions-Supervoltage radiation
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, Supervoltage radiation
Dose delivery of 200 +/- 10% cGy per day, 5 fractions per week (1000 cGy),
2-day rest interval
Completion of treatment in 6-8 weeks
Doses conditioned by partial volume organ irradiation
Hypofractionation
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Use of large daily fractions, however, the patient is not treated 5 days per
week
Dose per fraction is increased
Total dose is decreased
Late side effects are greater
Irradiated Volume
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A major factor in determining a tolerance dose is whether whole organ
versus partial organ is exposed to radiation
Principles of Radiation Therapy
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Radiation dose is determined by:
Radiosensitivity of the tumor.
Give this one a try later!
Increase in the number of fractions and reduction in dose per fraction in
the same overall time
Delivers smaller than standard fractional doses (100-120 cGy).
2-3 times per day.
4-6 hour intervals.
Overall treatment time remains the same 6-8 weeks.
Total dose increase by 10-20%.
Standard Set of Conditions-Supervoltage radiation
Give this one a try later!
, Supervoltage radiation
Dose delivery of 200 +/- 10% cGy per day, 5 fractions per week (1000 cGy),
2-day rest interval
Completion of treatment in 6-8 weeks
Doses conditioned by partial volume organ irradiation
Hypofractionation
Give this one a try later!
Use of large daily fractions, however, the patient is not treated 5 days per
week
Dose per fraction is increased
Total dose is decreased
Late side effects are greater
Irradiated Volume
Give this one a try later!
A major factor in determining a tolerance dose is whether whole organ
versus partial organ is exposed to radiation
Principles of Radiation Therapy
Give this one a try later!
Radiation dose is determined by:
Radiosensitivity of the tumor.
