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Control of Leafpositionen




were used:

1. a "50% bloc"
2. an aluminum plate d = ca 2mm with marking holes adjusted to the isocentre
3. including a memory film from Fuji
4. a flashlight to brighten the marking points after irradiation
   
5. tape and the reader from Fuji to the imaging plates
6. my Freeware DicoRView for evaluation

example
Justierfeld

• irradiate in the left part is the effect of blocking, 2 be identified.
• The height of the blocks is such that measured below that are below the aluminum plate 50% of the dose of the remaining field (with a 2D array)
• The white markers are recognized:
  illumination of the holes after irradiation removes the film at this point. can

isoline set

• With over up to 3 points, colored lines are set, all pixels with the same blackening . Connect
  
• the reference point for the line with the color magenta in the area below the 50% block - corresponds to this line so the 50% isodose.
• blue and green correspond to about 80% and 20%

isocenter and scale define

• By moving the 2 scaling points "zero" and "(0cm, 10cm), the coordinate system is adjusted to the Markierpunkte.
  

• guide points to each of the three contour lines can be any number of auxiliary points are created.
• 2 each auxiliary points are connected by a line (here blue and white dotted lines)
  
• is at each of two resulting lines of the center line drawn
• the vertical blue line in the small picture is the center line of the irradiated field compared the Y-axis of the coordinate

calculate the Leafpositionen

• can Leafpositionen be drawn to one of 3 possible isolines
• Scheme: 40 Leafpaare with 1 cm width (eg Elekta MLCi)
• the guide points of the isoline determine the line segment adapted to the.
• here the Leafs at the blue line are related - (Note: this is in the example is not correctly set, for positioning the 50% line would be correct)