Polymer gel dosimetry utilizing a 2D (SE) and a 2D (HASTE) multiple echo sequences

7th International Conference on 3D Radiation Dosimetry

Papoutsaki, M.-V.^1 ; Pappas, E.^2 ; Papadakis, A.E.^3 ; Varveris, C.^4 ; Damilakis, J.^1 ; Maris, T.G.^1

Department of Medical Physics, University of Crete, Medical School, Staurakia 71110, Crete, Greece^1

Department of Medical Radiological Technologists, Technological Educational Institute of Athens, Egaleo, 12210, Athens, Greece^2

Department of Medical Physics, University Hospital of Heraklion, Staurakia, 711110, Crete, Greece^3

Department of Radiation Therapy, University of Crete, Medical School, Staurakia, 711110, Crete, Greece^4

关键词: Acquisition time;    Confidence levels;    Dose sensitivity;    Linear portions;    Polymer gel dosimetry;    Resolution estimation;    Temporal stability;    Turbo spin echos;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/444/1/012088/pdf
DOI  :  10.1088/1742-6596/444/1/012088

来源: IOP

【 摘 要 】

Two pulse sequences were used for the estimation of dosimetric characteristics of VIPET polymer gels. The first one, multi- echo spin echo (MESE) is the well-established method for T2 measurements. The other method is a new multi-echo single shot turbo spin echo pulse sequence, MEHASTE that reduces the acquisition time significantly. Both techniques showed a linear R2-dose response. With MESE sequence, the dose sensitivity was slightly enhanced as compared to MEHASTE. The linear portion of the R2-dose curve was restricted using the MEHASTE sequence. For doses above 7 Gy both methods fulfill the 2% ICRU criterion limit for dose resolution estimations (95% confidence level). Finally, for a time period of one month the temporal stability of R2-dose response was maintained stable utilizing both MESE and MEHASTE pulse sequences. MEHASTE serves as an excellent means for fast 3D polymer gel dosimetry.