Wellspring Cancer CenterWellspring Cancer CenterPhysics Quality AssurancePhysics Quality Assurance

Outside Independent VerificationOutside Independent Verification

Inspections by Florida Radiation ControlInspections by Florida Radiation Control

Tests developed and evaluated by the Tests developed and evaluated by the Radiological Physics Center at MD Radiological Physics Center at MD Anderson Cancer CenterAnderson Cancer Center

State Inspections State Inspections

Florida Department of Health, Bureau of Florida Department of Health, Bureau of Radiation Control performs annual Radiation Control performs annual inspections to check for compliance with inspections to check for compliance with state radiation control regulationsstate radiation control regulations

Most recent inspection at Wellspring Most recent inspection at Wellspring Cancer CenterCancer Center 11/16/200911/16/2009 No violationsNo violations

Independent Outside VerificationIndependent Outside Verification

Radiological Physics Center at Radiological Physics Center at MD Anderson Cancer Center, Houston, TXMD Anderson Cancer Center, Houston, TX

Twice each year sends special dosimeters to Twice each year sends special dosimeters to be irradiated with a known radiation dose. be irradiated with a known radiation dose. These are returned to them and analyzed to These are returned to them and analyzed to determine how accurate the calibration is for determine how accurate the calibration is for each x-ray and electron energy.each x-ray and electron energy.

MD Anderson Radiological Physics CenterMD Anderson Radiological Physics CenterVerification of linear accelerator calibration accuracyVerification of linear accelerator calibration accuracy

Wellspring RPC TLD calibration checksof 2100C and 6/100 linear accelerators (all energies)

(acceptable ratio = 1.00 ± 5%)

0.90

0.95

1.00

1.05

1.10

Apr

-04

Sep

-04

Mar

-05

Oct

-05

date

RP

C/B

MC

upper limit

2100C 6x

2100C 10x

2100C 6e-

21EX 9e-

21EX 12e-

2100C 16e-

2100C 20e-

TOMO 6x

lower limit

ref

Independent Outside VerificationIndependent Outside Verification

Radiological Physics Center at Radiological Physics Center at MD Anderson Cancer Center, Houston, TXMD Anderson Cancer Center, Houston, TX

Provides various types of anthropomorphic phantoms Provides various types of anthropomorphic phantoms with inserts that simulate targets and protected with inserts that simulate targets and protected structures. structures.

The entire process of imaging, treatment planning, The entire process of imaging, treatment planning, QA by physics and actual treatment is performed on QA by physics and actual treatment is performed on the phantom just as if it were an actual patientthe phantom just as if it were an actual patient

After the phantom is irradiated according to the plan After the phantom is irradiated according to the plan it is returned to them to be analyzed for dose and it is returned to them to be analyzed for dose and position accuracy.position accuracy.

Radiological Physics Center at MD AndersonRadiological Physics Center at MD Anderson

CT scan of the phantomHead & Neck phantomHead & Neck phantom

MDA RPC IMRT MDA RPC IMRT Head and Neck Head and Neck

PhantomPhantom

Instructions for Instructions for planning and planning and

treating target treating target structures while structures while

sparing organs at sparing organs at riskrisk

RPC IMRT Head and Neck PhantomRPC IMRT Head and Neck Phantom

A treatment plan is prepared according to specific instructions to deliver a desired dose to the A treatment plan is prepared according to specific instructions to deliver a desired dose to the target structures and limit doses to protected structures just as would be done for a real patient.target structures and limit doses to protected structures just as would be done for a real patient.

MDA RPC IMRT Head and Neck PhantomMDA RPC IMRT Head and Neck PhantomTreatment Plan – Isodose DistributionTreatment Plan – Isodose Distribution

MDA RPC MDA RPC IMRT Head IMRT Head and Neck and Neck PhantomPhantom

ResultsResults

Radiological Physics Center at MD AndersonRadiological Physics Center at MD Anderson

Pelvic/Prostate PhantomPelvic/Prostate Phantom

diagram of a cross section of the phantom

imaging insert (bottom right), the dosimetry insert (top right), and the phantom (left).

MDA RPC IMRT MDA RPC IMRT Pelvic/Prostate Pelvic/Prostate

PhantomPhantom

Instructions for Instructions for planning and planning and

treating target treating target structures while structures while

sparing organs at sparing organs at riskrisk

MDA RPC IMRT Pelvic/Prostate PhantomMDA RPC IMRT Pelvic/Prostate PhantomTreatment Plan – Beam PositionsTreatment Plan – Beam Positions

MDA RPC IMRT Pelvic/Prostate PhantomMDA RPC IMRT Pelvic/Prostate PhantomTreatment Plan – Isodose DistributionTreatment Plan – Isodose Distribution

MDA RPC IMRT MDA RPC IMRT Pelvic/Prostate Pelvic/Prostate

PhantomPhantom

Results for Results for Wellspring Wellspring

Cancer Center Cancer Center Varian 21EX Varian 21EX

linear linear acceleratoraccelerator