Physical filtering yields scatter compensation in single photon emission computed tomography [SPECT] at some degree
Hamdard Medicus. 2012; 55 (4): 35-40
in English
| IMEMR
| ID: emr-139724
ABSTRACT
In Single Photon Emission Computed Tomography [SPECT] scattering of gamma Photons are considered to be inherent draw back of SPECT because in currently detecting systems mostly Nal [TI] sodium Iodied activated Thallium detectors are used, which has poor energy resolution as compared to other solid state detectors. Due to poor energy resolution some noticeable amount of scattered photons are registered in primary photo peak of single standard energy window 20% [centered at 140 keV] for Tc-99m radio nuclide. The registration of scatter gamma photons may affect the primary data and results in the poor contrast and quality images. To overcome this problem in SPECT material based physical filter of suitable thickness are imposed in conjunction with single standard electronic energy window. In this method the role of physical filter is to prevent low energy gamma photons prior to register in the crystal of the detecting device
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Index:
IMEMR (Eastern Mediterranean)
Main subject:
Thallium Radioisotopes
/
Phantoms, Imaging
Language:
English
Journal:
Hamdard Med.
Year:
2012
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