Fig 1.
(A) MRI scanner for dose readout of NIPAM polymer gel dosimeters. (B) Scanning position of the customized acrylic holder in a head coil.
Fig 2.
(A) Axial, (B) sagittal, and (C) coronal T2-weighted images of the irradiated NIPAM gel phantom. The poured materials and absorbed doses of the calibration tubes are labeled in (A).
Fig 3.
DRCs determined from 2, 5, 12, and 24 h T2-weighted images.
Table 1.
Standard errors of the parameters a and b (Δa and Δb), linearity of the DRC (r2), and the mean standard errors of the dose conversion from using the DRCs (mean ΔD).
Table 2.
Means and standard deviations of pass rates of axial, coronal, and sagittal dose maps acquired at 2, 5, 12 and 24 h after dose delivery.
Fig 4.
(A) DVH calculated from TPS and 2, 5, 12, and 24 h dose volumes. (B) Percent RV differences (dRV%) between the dose volumes from TPS and those from 2, 5, 12, and 24 h dose volumes.
Fig 5.
(A) Axial, coronal, and sagittal gamma maps calculated from 24 h dose maps. (B) Failed point maps, denoted in red.