Breast Cancer, Cancer, Otorhinolaryngeal, Cancer Pediatric, Lung Neoplasm, Pelvic Neoplasm
Conditions
Keywords
Image guided radiation therapy, dosimetry, X-rays
Brief summary
In image-guided radiotherapy (IGRT), the repeated and increasingly intensive use of on-board positioning imaging, using 2D or 3D Mega-Volt (MV) or kilo-Volt (kV) imaging devices (cone-beam or CBCT scanners), is leading the international medical community to question the potential impact of these additional doses delivered to the patient, especially in at-risk populations such as children and young adults. The doses delivered to the patient by positioning imaging are still relatively unknown, due to the lack of experimental means and software available in clinical routine to easily and accurately evaluate these doses. The main objective is to estimate by personalized Monte Carlo calculation the physical doses delivered to the patient's organs by the onboard imaging systems during their radiotherapy treatment. The obtained imaging doses will be compared according to different irradiation scenarios commonly used in clinical routine as well as according to the treated location.
Detailed description
The study will consist of 2 successive steps: * Step 1 : for a set of patients selected in the clinical centers participating in the study, 3D maps of physical doses delivered to organs by positioning imaging will be calculated based on the patient's CT image used by the treatment planning system (dosimetric calculation performed by Monte Carlo method). * Step 2/ all the new dosimetric data, average organ doses and dose volume histogram, will be the subject of a more global analysis, which will be returned to the project's clinical partner centers.
Interventions
OTHER3D maps of physical doses
3D maps of physical doses delivered to organs by positioning imaging will be calculated based on the patient's CT image used by the treatment planning system (dosimetric calculation performed by Monte Carlo method).
Sponsors
Commissariat A L'energie Atomique
Assistance Publique - Hôpitaux de Paris
Study design
Observational model
COHORT
Time perspective
RETROSPECTIVE
Eligibility
Sex/Gender
ALL
Healthy volunteers
No
Inclusion criteria
* IGRT (Image Guided Radiation Therapy) treatments considered: lung, pelvic (prostate), breast, ENT and pediatric cancers * Treatment modalities: linac + daily kV-CBCT (kilo-Volt ConeBeam CBCT) and linac + weekly kV-CBCT + daily 2-Dimensional-kilo-Volt (2D-kV) (adult: lung, prostate, breast, Ear Nose and Throat (ENT); pediatric: neuro, ENT, thorax and abdomen); Cyberknife + daily 2D-kV (adult lung); Tomotherapy + daily MV-CBCT (Mega-Volt ConeBeam CBCT) (adult prostate, breast, ENT; pediatric ENT, thorax and abdomen)
Exclusion criteria
* Patient who has undergone a treatment discontinuation or modification (re-planning) of treatment with an impact on the IGRT protocol. * Patient for which details on the imaging procedures used during treatment or DICOM files (DICOM CT, DICOM RTstruct) are incomplete will not be included
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Global analysis of 3D mapping of physical doses delivered to organs by positioning imaging. | One year after end of data collection | Global analysis of 3D mapping of physical doses delivered to organs by positioning imaging. These analyses will aggregate the Doses Volumes Histograms (HDV) by organs of interest as well as the mean dose to 10% (D10), 50% (D50) and 90% (D90) metrics for these same organs to form an individual dosimetric report. |
Countries
France
Contacts
Primary ContactAlexandra BRUNEAU
Outcome results
None listed