TITLE:
Radiation Shielding Analysis and Design of tof PET-CT Facility at Institute of Nuclear Medical Physics under Bangladesh Atomic Energy Commission, Bangladesh
AUTHORS:
M. F. Uddin, R. Khatun, S. Akter, H. M. Jamil, A. N. Monika, M. A. Rahaman, R. P. Das, R. A. Sharmin, M. M. Rahman, M. M. Ahasan
KEYWORDS:
Radiation Protection, PET-CT, Shielding, FDG
JOURNAL NAME:
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology,
Vol.8 No.1,
January
21,
2019
ABSTRACT: High
resolution (4 mm) tof PET-CT (positron emission tomography-computed tomography) from Philips of model Ingenuity TF is newly installed at Institute
of Nuclear Medical Physics (INMP). 128 slice CT component incorporated with PET
provides comparatively lower dose than the 511 keV annihilation photons
associated with positron decay from PET scan. So, for designing shielding in
our PET-CT facility, only 511 keV annihilation photons energy has been
considered. The main objective of this paper is to show what measures have been
taken to protect patients, occupational workers as well as environment from
PET-CT radiation hazard through a cost effective design that satisfy the
national regulatory demand. In this paper, AAPM (American Associations of
Physicists in Medicine) Task group 108 analysis for PET and PET-CT shielding
requirements is followed for our PET-CT facility shielding design. From theoretical calculation as shielding
requirement, 1.1 cm Pb thickness or, 13 cm concrete thicknesses are
found. Practically, all walls and ceiling are of 30.48 cm (1 foot) thick made
of concrete with density 2.35 gcm-3 for more safety. As x-ray from
CT is not
taken into account for shielding analysis, Bangladesh Atomic Energy Commission
(BAEC) conducted an extensive radiation survey at controlled, supervised and
public area for CT. The report that is found meets the national regulatory
requirements.