publishing title: evaluation of the systematic accuracy of cutting edge technology for stereotactic...
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Publishing Title: Evaluation of the Systematic Accuracy of Cutting Edge Technology for Stereotactic Radiosurgery
Treatment Session title: Physics 1 - Innovative Planning and Delivery
StrategiesDate/Time: 2014-09-16 13:00
Location: Room D-1Monitor number: 3
Ning WenDepartment of Radiation Oncology
Henry Ford Health System2799 W. Grand Blvd
Detroit, MI48202
The Edge system at Henry Ford
E: 6XFFF, 10XFFF2.5XFFF, HD120MLC
MV DetectoraS1200, 43x43 cm2
Calypso
PerfectPitch® 6D Couch
OSMS x 3
IR camera
Calypso x 3
EDGE E2E Phantom (Prototype) Outer cube dimensions: 15 x 15 x 15 cm3,
density 0.45 g/cm3
Trackable using– kV, MV radiographic imaging (16x 5mm diameter
BB’s made of ceramics Al2O3)– CBCT (densities: 0.25, 0.45, 1.05 and 1.42 g/cm3)– Calypso (Beacon® transponders are not
removable)– OSMS
Interchangable inner cubes (7 x 7 x 7 cm3)– Single film plane for all 3 orthogonal isocenter
planes, density=1.05 g/cm3
– Two orthogonal film planes, density=1.05 g/cm3
– 5 mm diameter tungsten BB in center (W-L test)
Mechanical accuracy < 5/100 mm
Image Courtesy from Varian
Winston Lotz Test ResultsGantry Rotation Gantry-Collimator-Couch Rotation
Central
BB56.5 mm
BB65 mm
BB92 mm
BB
Mean 0.30 0.44 0.52 0.47
Std 0.08 0.19 0.13 0.15Max 0.44 0.71 0.84 0.65Min 0.17 0.14 0.43 0.25
Central
BB56.5 mm
BB65 mm
BB92 mm
BB
Mean 0.56 0.51 0.62 0.63
Std 0.24 0.24 0.43 0.35Max 0.84 0.80 1.18 1.18Min 0.16 0.20 0.05 0.20
Multiple Targets Single Isocenter Test
Auto + Manual Auto
Summary
Coincidence of isocenters of the imaging systems and Linac is within 1 mm.
The localization accuracy of the Edge platform can achieve submillimeter level.
The targeting accuracy for multiple lesions with shared isocenter is promising. However lesion size and the distance from the isocenter should be evaluated before planning.
Other factors (CT, MR, imaging fusion, contour, tumor motion) should be considered in the SRS/SBRT treatment.