Dosimetric Measurements

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Presentation transcript:

Dosimetric Measurements Surface Applicator Dosimetric Measurements

Xoft Dosimetry As a leader in dosimetric studies, Xoft routinely creates custom fixturing to characterize performance of the Axxent source and applicators For the surface applicator the effort involves both film and ion chamber based apparatus

Film Water Phantom Beam profiles at various depths via end-on films

Film Water Phantom Or all at once with an edge-on film

Film Profiles of 30 mm Applicator Profiles at 0, 5 and 10 mm from applicator surface

Film Profiles of 30 mm Applicator Profile at applicator surface

Film Profiles of 30 mm Applicator Profile at 5 mm from applicator surface

Film Profiles of 30 mm Applicator Profile at 10 mm from applicator surface

Effect of a Flattening Filter With the Xoft 50 kVp spectrum, it is easy to turn this... Unfiltered intensity profiles At applicator surface 5 mm deep

Effect of Flattening Filter Into this… or even into a custom pattern Filtered intensity profiles At applicator surface 5 mm deep

Data Extraction from Edge-on Films Start with a calibrated film image…

Data Extraction from Edge-on Films Select points to extract dose values from…

Data Extraction from Edge-on Films And get a series of profile plots at different depths

Data Extraction from Edge-on Films Or change the pattern…

Data Extraction from Edge-on Films And get a series of depth dose plots at different positions

Ion Chamber Based Apparatus Miniature ion chamber rotates around surface applicator

Ion Chamber Provides Absolute Dose Data Good check on film calibration

Xoft Surface Applicator Xoft is committed to extensive dosimetric characterization of all existing and future applications of the Axxent source