Dosimetric quality assurance of highly conformal external beam treatments: from 2D phantom comparisons to 4D patient dose reconstruction

7th International Conference on 3D Radiation Dosimetry

Feygelman, V.^1 ; Nelms, B.^2

Department of Radiation Oncology, Moffitt Cancer Center, Tampa, FL 33612, United States^1

Canis Lupus LLC, Merrimac, WI 53561, United States^2

关键词: Commissioning process;    Dose distributions;    Dose reconstruction;    Dosimetric quality assurance;    Gamma analysis;    Historical review;    Patient specific;    Sensitivity and specificity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/444/1/012012/pdf
DOI  :  10.1088/1742-6596/444/1/012012

来源: IOP

【 摘 要 】

As IMRT technology continues to evolve, so do the dosimetric QA methods. A historical review of those is presented, starting with longstanding techniques such as film and ion chamber in a phantom and progressing towards 3D and 4D dose reconstruction in the patient. Regarding patient-specific QA, we envision that the currently prevalent limited comparison of dose distributions in the phantom by γ-analysis will be eventually replaced by clinically meaningful patient dose analyses with improved sensitivity and specificity. In a larger sense, we envision a future of QA built upon lessons from the rich history of "quality" as a science and philosophy. This future will aim to improve quality (and ultimately reduce cost) via advanced commissioning processes that succeed in detecting and rooting out systematic errors upstream of patient treatment, thus reducing our reliance on, and the resource burden associated with, per-beam/per-plan inspection.