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Design and performance evaluation of a new high energy parallel hole collimator for radioiodine planar imaging by gamma cameras: Monte Carlo simulation study

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Abstract

Objective

In addition to the trade-off between resolution and sensitivity which is a common problem among all types of parallel hole collimators (PCs), obtained images by high energy PCs (HEPCs) suffer from hole-pattern artifact (HPA) due to further septa thickness. In this study, a new design on the collimator has been proposed to improve the trade-off between resolution and sensitivity and to eliminate the HPA.

Methods

A novel PC, namely high energy extended PC (HEEPC), is proposed and is compared to HEPCs. In the new PC, trapezoidal denticles were added upon the septa in the detector side. The performance of the HEEPCs were evaluated and compared to that of HEPCs using a Monte Carlo-N-particle version5 (MCNP5) simulation. The point spread functions (PSF) of HEPCs and HEEPCs were obtained as well as the various parameters such as resolution, sensitivity, scattering, and penetration ratios, and the HPA of the collimators was assessed. Furthermore, a Picker phantom study was performed to examine the effects of the collimators on the quality of planar images.

Results

It was found that the HEEPCD with an identical resolution to that of HEPCC increased sensitivity by 34.7%, and it improved the trade-off between resolution and sensitivity as well as to eliminate the HPA. In the picker phantom study, the HEEPCD indicated the hot and cold lesions with the higher contrast, lower noise, and higher contrast to noise ratio (CNR).

Conclusion

Since the HEEPCs modify the shaping of PSFs, they are able to improve the trade-off between the resolution and sensitivity; consequently, planar images can be achieved with higher contrast resolutions. Furthermore, because the HEEPCS reduce the HPA and produce images with a higher CNR, compared to HEPCs, the obtained images by HEEPCs have a higher quality, which can help physicians to provide better diagnosis.

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Authors and Affiliations

  1. Nuclear Science and Technology Research Institute, AEOI, P.O. Box: 113653486, Tehran, Iran

    Vahid Moslemi & Mansour Ashoor

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  1. Vahid Moslemi
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  2. Mansour Ashoor
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Correspondence to Vahid Moslemi.

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Moslemi, V., Ashoor, M. Design and performance evaluation of a new high energy parallel hole collimator for radioiodine planar imaging by gamma cameras: Monte Carlo simulation study. Ann Nucl Med 31, 324–334 (2017). https://doi.org/10.1007/s12149-017-1160-9

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  • DOI: https://doi.org/10.1007/s12149-017-1160-9

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