Medical application of 3-D polymer gel dosemeter evaluated by nuclear magnetic resonance.
A polymer-gel dosemeter, which can be evaluated by nuclear magnetic resonance (NMR), was prepared and then a few samples were homogeneously irradiated by a Leksell gamma knife using an 18 mm collimator (60Co gamma photons) to obtain a calibration curve (NMR 1/T2 response to absorbed dose). To measure dose distribution from the Leksell gamma knife, a testing flask tilled with the gel was fixed in the head phantom and then irradiated based on a calculated treatment plan. Evaluation of dosemeters was performed on a Siemens EXPERT 1T NMR scanner. Dose profiles in X, Y and Z coordinates through the ellipsoidal shape of the dose distribution were obtained to compare experimental results from the irradiated phantom with the treatment planning system calculations. The use of a polymer-gel dosemeter for a verification of stereotactic procedures has some unique advantages which can be summarised as follows: (1) the dosemeter itself is tissue equivalent, (2) three-dimensional dose distributions can be measured, (3) the dosemeter allows patient's procedures to be simulated without any limitations.
Novotný
J
J
Hospital Na Homolce, Dept. of Stereotactic and Radiation Neurosurgery, Prague, Czech Republic. josef.novotnyml@homolka.cz
Dvorák
P
P
Spevácek
V
V
Tintera
J
J
Novotný
J
J
Cechák
T
T
D002138:Calibration; D003037:Cobalt Radioisotopes; D006257:Head; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D019047:Phantoms, Imaging; D017785:Photons; D011108:Polymers; D011834:Radiation Monitoring / Q000379:methods*; D011879:Radiotherapy Dosage
D003037:Cobalt Radioisotopes; D011108:Polymers