Evaluating the Effect of Acquisition Parameters on Image Quality in SPECT with LEAP using Quadrant-Bar Phantom at Korle-Bu Teaching Hospital

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Author(s) Issahaku Shirazu | John Humphrey Amuasi | Mary Boadi | Edem Kwabla Sosu | Francis Hasford
Pages 568-575
Volume 2
Issue 7
Date July, 2013
Keywords Statistical moment method, Resolution, Full width at half maximum, image quality, acquisition parameters, and Radiopharmaceutical
Abstract

The study was undertaken to evaluate the effect of acquisition parameters (matrix size, count density and object-collimator distance) on the quality of SPECT images using the Statistical Moment Method. Images were acquired by placing the quadrant-bar phantom on flood field uniformity Phantom filled with 25mCi of 99m-Tc solution. The method involved keeping two of the three acquisition parameter constant while varying the remaining parameters. The experimental results demonstrate that as the matrix size increases from 64x64 to 1024 x 1024 the image quality improved by 28% in image resolution. Also, Image quality is degraded as the distance between the object and the collimator increased. At 00mm object-collimator distance (when in contact) the image quality is improved by 28.57% from the default setting of 40mm. Furthermore, count density has a minimal influence on image quality. Matrix size of 512x512 produce the best image resolution, taken into account the acquisition time and stability factors, hence should be adopted for used and the detector should be as close to the object as possible. However, the count density should be 20 Mcts since the result produced exactly the same image resolution with higher count densities but with shorter acquisition time.

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