QUANTIFICATION OF PARTIAL VOLUME EFFECTS IN PLANAR IMAGING

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NYATHI MPUMELELO; SITHOLE ENOCH; RAMAFI OUMA

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Journal Paper

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Journal: Iranian Journal of Nuclear Medicine Year:2016 | Volume:24 | Issue:2 (SERIAL NUMBER 46) Page(s): 115-120

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Information Journal Paper

Title

QUANTIFICATION OF PARTIAL VOLUME EFFECTS IN PLANAR IMAGING

Author(s)

NYATHI MPUMELELO | SITHOLE ENOCH | RAMAFI OUMA | Issue Writer Certificate

Keywords

PLANAR IMAGING

PARTIAL VOLUME EFFECTS

QUANTIFICATION

Abstract

Introduction: The limited resolution of the imaging system causes PARTIAL VOLUME EFFECTS (PVEs). These results in spreading of image counts to the neighboring pixels. This phenomenon is called spill-out effect. This study aimed at quantifying PVEs using ImageJ.Methods: Technetium-99m solution of concentration of 74 kBq/ml was filled into spheres A, B and C of diameters: 26 mm, 20 mm and 16 mm respectively. The spheres were imaged mounted inside a Jaszczak phantom filled with activity free water using a Siemens E-Cam dual head gamma camera. Images were quantified using ImageJ following a two-step method. Step 1: Drawing of region of interest 1 (ROI 1) closely on the boundary of the planar image to extract images counts before PVEs correction. Step 2: Drawing region of interest 2 (ROI 2) to extract true sphere image counts. ROI 2 extends from the boundary of ROI 1 by the FWHM of the imaging system.Results: The study revealed that PVEs are aggravated by decrease in sphere size. Underestimation of image counts on the 64×64 pixels matrix was found to be: 9.7%; 15% and 26% in the order of decreasing sphere size. However, an improvement in the spatial resolution decreased PVEs (128×128 pixels: 6.7%; 12.0% and 22.5%; 256×256 pixels: 6.5%; 9% and 19.3%; 256×256 pixels: 6.1%; 8.0% and 18.7% in the order of decreasing sphere size).Conclusion: ImageJ successfully quantified PVEs attributed to the spill-out effect in PLANAR IMAGING.

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APA: Copy

NYATHI, MPUMELELO, SITHOLE, ENOCH, & RAMAFI, OUMA. (2016). QUANTIFICATION OF PARTIAL VOLUME EFFECTS IN PLANAR IMAGING. IRANIAN JOURNAL OF NUCLEAR MEDICINE, 24(2 (SERIAL NUMBER 46)), 115-120. SID. https://sid.ir/paper/689863/en

Vancouver: Copy

NYATHI MPUMELELO, SITHOLE ENOCH, RAMAFI OUMA. QUANTIFICATION OF PARTIAL VOLUME EFFECTS IN PLANAR IMAGING. IRANIAN JOURNAL OF NUCLEAR MEDICINE[Internet]. 2016;24(2 (SERIAL NUMBER 46)):115-120. Available from: https://sid.ir/paper/689863/en

IEEE: Copy

MPUMELELO NYATHI, ENOCH SITHOLE, and OUMA RAMAFI, “QUANTIFICATION OF PARTIAL VOLUME EFFECTS IN PLANAR IMAGING,” IRANIAN JOURNAL OF NUCLEAR MEDICINE, vol. 24, no. 2 (SERIAL NUMBER 46), pp. 115–120, 2016, [Online]. Available: https://sid.ir/paper/689863/en

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