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Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
Quality Assurance of the Radiation Therapy Process
Restoring the Missing Link
Jan Pursley, MSSicel Technologies
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
Radiation therapy process is like a chain
Success depends on the weakest link !
Immobilization
Treatment
Quality Assuranceand Verification
Treatment Planning
Tumor Localization
PatientPositioning
Imaging
Adapted from Webb S, “Physics of Three Dimensional radiation therapy”, IOP, 1993
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
Radiation therapy process is like a chain
Success depends on the weakest link !
Adapted from Webb S, “Physics of Three Dimensional radiation therapy”, IOP, 1993
Immobilization
Treatment
Quality Assuranceand Verification
Treatment Planning
Tumor Localization
PatientPositioning
Imaging
x
Sicel Technologies®
French Lessons…
Sicel Technologies®
French Lessons…
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
DVS Reader
Implantable Dosimeter
DVS®
(Dose Verification System)
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
Individual Patient QA with Direct Patient Dose Measurement
2
What does ‘good’ look like?
1
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
1
2
What does ‘good’ look like?
What does ‘good’ look like?
Individual Patient QA with Direct Dose Measurement
7-field IMRT plan
designed to avoid
prostheses
Daily dose variations in patient with bilateral hip prostheses
What does ‘not so good’ look like?
DVS #2 DVS #1
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
Individual Patient QA with Direct Dose Measurement
What can be done to turn
‘bad’ into ‘good’?
DVS #1
DVS #2
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
Individual Patient QA with Direct Dose Measurement
DVS #1 DVS #2out of slice plane
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
Individual Patient QA with Direct Dose Measurement
Sicel Technologies®
DVS is a product and trademark of Sicel Technologies®, Inc.
Summary
• As a complement to a radiation therapy QA process, in vivo dosimetry can identify gross errors that occur along the chain
• Internal dose verification (in situ dosimetry) alerts the physician to subtle errors that can improve therapeutic outcome and decrease morbidity
