Choice of Evaluation Imaging Technique for MAGAT Polymer Gel Dosimeter


  • Nik Noor Ashikin Nik Ab Razak School of Physics, Universiti Sains Malaysia
  • A. R. Azhar
  • S. M. Iskandar
  • M. R. Ramzun
  • Y. N. Zakiah
  • N. A. N. Zahirah
  • M. Amer-al-Jarrh


MAGAT gel dosimeter, dose response, MRI imaging, x-ray CT


The development of the polymer gel dosimeter evaluation focused mainly on magnetic resonance imaging (MRI) techniques. A new alternative imaging technique which is x-ray CT imaging has emerged from a current research. The study focused on the dose response, the dose sensitivity and the accuracy of the MAGAT gel dosimeter using two different imaging modalities. The MAGAT gel dosimeter was irradiated at 1, 5 and 10 Gy 24-h post-manufacturing. The imaging of MAGAT gel dosimeter by MRI and x-ray CT were done a day post-irradiation using an optimized protocol. The dose sensitivity of the gel obtained by the MRI technique was 0.7157 s-1Gy-1, whereas the dose sensitivity obtained by the x-ray CT technique was 0.6177 HGy-1.

Author Biography

Nik Noor Ashikin Nik Ab Razak, School of Physics, Universiti Sains Malaysia


School of Physics,

Universiti Sains Malaysia



Day, M.J. and G. Stein, Chemical effects of ionising radiation in some gels. Nature, 1950. 166:146–147.

Day, M.J., et al., Gel dosimeter for depth dose measurements. . Review of scientific instruments, 1957. 28:329–332.

Maryanski, M.J., J.C. Gore, and R.J. Schulz, 3D radiation dosimetry by MRI: solvent proton relaxation enhancements by radiation-controlled polymerisation and crosslinking in gels. . proc. Soc. Magn. Reson. Med., 1992:1325.

Maryanski, M.J., et al., NMR relaxation enhancement in gels polymerized and cross-linked by ionizing radiation: a new approach to 3D dosimetry by MRI Magn. Reson. Imaging 1993. 11: 253–258.

Baldock, C., et al., Polymer gel dosimetry Phys. Med. Biol. , 2010. 55:R1–R63 505.

Hiraoka, T., N. Fukuda, H. Ikehira, K. Hoshino, K. Nakazawa, Y. Tatemo, and K. Kawashima. 1986. Digital imaging of dose distributins by magnetic resonance. Nippon Igaku Hoshasen Gakkai Zasshi- Nippon Acta Radiologica 46:503-505.

De Deene, Y., Hurley, C., Venning, A., Vergote, K., Mather, M., Healy, B.J., and Baldock, C. 2002a. A basic study of some normoxic polymer gel dosimeters Phys. Med. Biol. 47:3441–3463.

De Deene, Y., and C. Baldock. 2002b. Optimization of multiple spin-echo sequences for 3D polymer gel dosimetry. Phys. Med.Biol 47:3117-3141.

Maryanski, M.J., Ibbott, G.S., Eastman, P. Schulz, R.J., and Gore, J.C. 1996. Radiation therapy dosimetry using resonance imaging of polymer gels Med. Phys. 23:699–705.

Ibbott, G.S., Maryanski, M.J., Eastman, P., Holcomb, S.D., Zhang, Y.S., Avison, R.G., Sanders, M., and Gore, J.C. 1997. 3D visualization and measurement of conformal dose-distributions using MRI of BANG-gel dosimeters Int.J. Radiat. Oncol. Biol. Phys. 38:1097–1103.

Oldham, M., Baustert, I.B., Lord, C., Smith, T.A.R., McJury, M., Leach, M., Warrington, A.P., and Webb, S. 1998. An investigation into the dosimetry of a 9 field tomotherapy irradiation using BANG-gel dosimetry Phys. Med. Biol. 43:1113–1132.

Trapp, J.V., S.A.J. Back, M. Lepage, G. Michael, and C. Baldock. 2001. An experimental study of the dose response of polymer gel dosimeters imaged with x-ray computed tomography. Phys. Med. Biol. 46:2939-2951.




How to Cite

Nik Ab Razak, N. N. A., Azhar, A. R., Iskandar, S. M., Ramzun, M. R., Zakiah, Y. N., Zahirah, N. A. N., & Amer-al-Jarrh, M. (2015). Choice of Evaluation Imaging Technique for MAGAT Polymer Gel Dosimeter. Asian Journal of Applied Sciences, 3(2). Retrieved from