International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 9, September 2017

International Journal of Science and Technology

The Effect of Collimator Selection on Acquisition Time with varying Acquisition Parameters using Quadrant Bar Phantom at Korle-Bu Teaching Hospital

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Author(s) Issahaku Shirazu, John Humphrey Amuasi,Mary Boadu,Edem Kwabla Sosu,Francis Hasford
On Pages 277-280
Volume No. 3
Issue No. 5
Issue Date May, 2013
Publishing Date May, 2013
Keywords LEAP and LEHR Collimators, Acquisition Time, flood field uniformity Phantom, Artifacts and SPECT


The study was undertaken to evaluate the effect of collimator selection on acquisition time while varying the matrix size, the count density and the object-collimator distance. Images were acquired by placing the quadrant-bar phantom on flood field uniformity Phantom filled with a 99m-Tc solution. The method involves imaging the combined Phantom with the SPECT system by using Low energy all-purpose (LEAP) collimator after which the LEAP collimator was replaced with the LEHR collimator and the process repeated. The experimental results demonstrate an increase from 11.89% to 170.29% in acquisition time when the acquisition parameters were varied using LEAP collimator and 9.63% to 164.82% in acquisition time when the acquisition parameters were varied the same way using LEHR collimator. Hence, the LEHR collimator has better acquisition time efficiency than the LEAP collimator. Also, LEHR collimator is better suitable for patient stability and appropriate in obtaining patients images. In patient study, patient motion occurring during data acquisition in SPECT could cause serious artifacts. This is likely to happen when images are acquired at much longer time. Hence the acquisition time should be suitable for patient stability.

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