2017_SBRT_Course Book

Stereotactic Body Radiation Therapy: Dosimetric impact of prostate motion

3mm SM 4 Fx

% Px with 98% coverage

• Longer treatment

w/o tracking

61 %

fractions with ↑ motion

15 sec imaging interval

91%

• Less „smearing“ effect

• Smaller margins

60 sec imaging interval

96%

Van de Water IJROBP 2014

➢ Increased relevance of prostate motion in SBRT ➢ Increased imaging frequency does not necessarily improve accuracy

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