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Stereotactic Radiosurgery at UIHC
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Stereotactic Radiosurgery at UIHC

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  • 1. Stereotac(c  Radiosurgery   (Rota(on  #  9)   Mentor:  Edward  C  Pennington   (01/19/2010  –  03/05/2010)   By     Vibha  Chaswal,  Ph.D.  
  • 2. Contents  
  • 3. Ac(vi(es     •  Es(ma(on  of  mechanical  accuracy  of  the  floor-­‐ stand   •  End-­‐to-­‐end    process  tes(ng:  Absolute  phantom   based  QA:  Frame-­‐based  and  Frame-­‐less  SRS   •  Small  field  dosimetry  measurements:  TMRs,   output  factors,  profiles,  off-­‐axis  factors   •  CT  to  MRI    image  registra(on   •  SRS  treatment  planning   •  Pre-­‐treatment  SRS  floor-­‐stand  QA   •  Par(cipa(on  in  treatment  delivery    
  • 4. Mechanical  QA:  Floor-­‐stand  
  • 5. End-­‐to-­‐End:  CT-­‐ Localiza1on   (Frame-­‐based)   TILT  and  SPIN  Adjusted   on  Frame.  CT-­‐Localiza(on   with  (lt  and  spin   correc(on   Max  error:   Ax  (0.4  mm)   Lat  (0.3  mm)   A-­‐P  (0.5  mm)   3D  (0.6  mm)  
  • 6. Frame-­‐based   End-­‐to-­‐End  tes(ng:  Floor-­‐stand     isocentric  localiza(on    
  • 7. Frame-­‐Less  SRS     End-­‐to-­‐End  isocentric  localiza(on  :  
  • 8. SRS  Commissioning:   Small  field  dosimetry   TMR  and  Out-­‐put  measurement  set-­‐up   NOT  A  TRIVIAL  AFFAIR  !!!!!!!!!  
  • 9. ~  3.5  %  lower  TMR   And  dmax  ~  1  cm  
  • 10. Re-­‐measurement  of  TMRs    Stereotac1c     Chamber-­‐valida1on  
  • 11. TMR’s  s(ll  off     but  d-­‐max  depth  =  1.5  cm  
  • 12. OUT-­‐PUT  Factor   measurements  
  • 13. Off-­‐Axis-­‐Factors  
  • 14. Recommenda(on  of  independent   Physics  check  on  TMR  measurements   of  small  fields.   Iden(fied  pit-­‐falls:   SRS  stereotac(c  chamber  response  with  depth   L-­‐R  (lt  on  the  SRS  phantom  base  (resolved  with  a  (ssue  propped  at  led  side)  
  • 15. Par(cipa(on   and   observa(on   in  SRS  work-­‐ flow:   Iden(fica(on   of  Physics  QA   at  all  steps  
  • 16. ThankYou!!!!!