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IJSTR >> Volume 4 - Issue 7, July 2015 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Optimum Energy Window In Liver Scintigraphy

[Full Text]



Alireza Sadremomtaz, Mohaddeseh Saber Zidehsaraei



Keywords: energy window, image quality, noise, SIMIND, simulation.



Abstract: In liver scintigraphy, radioactive tracers, in addition to liver, are accumulated in other organs such as spleen. It leads to the presence of secondary source, which affects image quality. Therefore, knowing the influence of the noise arising from the secondary source and trying to reduce the additional data is necessary. In nuclear medicine imaging, using of energy window is a useful way to reduce the noise. In this paper, we try to find an optimum energy window to reduce the noise for two different low energy collimators. Liver scintigraphy images with and without activity in spleen were simulated by SIMIND software with different energy window percentages and with Low-Energy High-Resolution (LEHR) and Low-Energy General-Purpose (LEGP) collimators. We used with activity of 190 MBq. Spleen was outside of the camera field of view so that just its noise effects on the liver image is examined. Finally, the images of liver with activity in spleen were compared with that without activity in spleen by MATLAB code.



[1] S.R. Cherry, J.A. Sorenson, M.E. Phelps, “Physics in Nuclear Medicine”, 3rd ed, Philadelphia, Saunders, 2003, pp. 361-417.

[2] H.D. Royal, M.L. Brown, D.E. Drum, et al. “Society of Nuclear Medicine Procedure Guideline for Hepatic and Splenic Imaging 3.0”, 2003. https://snmmi.files.cmsplus.com/docs/pg_ch10_0403.pdf

[3] M. Ljungberg, “The SIMIND Monte Carlo program”. Lund, Sweden, Lund University. 2009, pp. 1-48.

[4] M. Ljungberg, S.E. Strand, N. Rajeevan, M.A. King, “Monte Carlo simulation of transmission studies using a planar source with a parallel collimator and a line source with a fan-beam collimator,” IEEE Transl. J. Nucl Sci, vol. 41, issue 4, pp. 1577-1584, 1994.

[5] M.T. Bahreyni Toossi, J.P. Islamian, M. Momennezhad, M. Ljungberg, S.H. Naseri, “SIMIND Monte Carlo simulation of a single photon emission CT,” J. Med Phys, vol. 35, issue 1, pp. 42-7, 2010.

[6] M.T. Bahreyni Toossi, J.P. Islamian, M. Momennezhad, S.R. Zakavi, R. Sadeghi, “Monte Carlo Study of the Effect of Backscatter Material Thickness on 99mTc Source Response in Single Photon Emission Computed Tomography,” IJMP. Iran, vol. 10, issue 1, pp. 69-77, 2013.

[7] M. Ljungberg, S.E. Strand, M.A. King, “Monte Carlo Calculations in Nuclear Medicine”, 2nd ed, Applications in Diagnostic Imaging. 2012.

[8] I.G. Zubal, C.R. Harrell, “Computerized three-dimentional segmented human anatomy,” J. Med Phys, vol. 21, pp. 299-302, 1994.

[9] W.P. Segars, G. Sturgeon, S. Mendonca, J. Grimes, B.M.W. Tsui, “4D XCAT phantom for multimodality imaging research,” J. Med Phys, vol. 37, issue 9, pp. 4902-4915, 2010.

[10] I.G. Zubal, C.R. Harrell, “Voxel Based Monte Carlo Calculations of Nuclear Medicine Images and Applied Variance Reduction Techniques,” J. Information Processing in Medical Imaging, 12th International Conf. IPMI '91 Wye, UK. pp. 23-33, 1991.

[11] I.G. Zubal, C.R. Harrell, “Voxel Based Monte Carlo Calculations of Nuclear Medicine Images and Applied Variance Reduction Techniques,” J. Image and Vision Computing, vol. 10, issue 6, pp. 342-348, 1992.

[12] Healthcare Product hpcs Comparison system,©. Scanning Systems, Gamma Camera, 2002. Available at http://www.ecri.org

[13] D. Holmberg, “Optimisation of image acquisition and reconstruction of 111In-pentetrotide SPECT”, Master’s thesis in Engineering Physics 30 hp. UMEÅ university, Department of Radiation Sciences. Sweden, 2012.

[14] D.K. Dewangan, Y. Rathore, “Image Quality Costing of Compressed Image Using Full Reference Method,” J. Tech [serial online] vol. 1, issue 20, pp. 68-71, 2011, [2231-3907]. Available from:URL: http://www.enggresearch.net