Energy window and contrast optimization for single-photon emission computed tomography bremsstrahlung imaging with yttrium-90

Bouzekraoui, Youssef; Bentayeb, Farida; Asmi, Hicham; Bonutti, Faustino

doi:10.4103/ijnm.ijnm_150_18

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…These parameters were compared within the 20% and 10% energy windows. It can be seen from the table that, for each collimator, the FWTM increased with the width of the energy windows, especially for the LEHR and ME collimators, while, the FWHM remained approximately the same ( 21 , 22 , 23 ). On the other hand, the sensitivity decreased when the width of the energy window decreased, which was an extremely sharp transition for LEHR.…”

Section: Resultsmentioning

confidence: 92%

“…The curves of Ga-67 with the ME and HE collimators demonstrate the effects of the septal that lowers the resolution. LEHR offers a poorer resolution than the HE and ME collimators within 20% and 10% windows ( 20 , 21 , 22 ) owing to the septal penetration and the scattering effects.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of a high level of penetrated and scattered photons from the LEHR collimator degrades spatial resolution, contrast, and quantification ( 20 , 21 , 22 , 23 , 24 ). Table 6 depicts that the use of LEHR collimator with Ga-67 imaging resulted in the most degraded spatial resolution, while the use of an HE collimator in Ga-67 imaging resulted in the loss of sensitivity and spatial resolutions ( 25 ).…”

Section: Discussionmentioning

confidence: 99%

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Collimator and Energy Window Evaluation in Ga-67 Imaging by Monte Carlo Simulation

Ouahman

Errifai

Asmi

et al. 2020

Mirt

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Objectives: Gallium-67 (Ga-67) imaging is affected by collimator penetration and scatter components owing to the high-energy (HE) gamma-ray emissions. The characterization of penetration and scatter distribution is essential for the optimization of low-energy high-resolution (LEHR), medium energy (ME), and HE collimators and for the development of an effective correction technique. We compared the image quality that can be achieved by 3 collimators for different energy windows using the SIMIND Monte Carlo code. Methods: Simulation experiments were conducted for LEHR, ME, and HE collimators for Ga-67 point source placed at 12-cm distance from the detector surface using the Monte Carlo SIMIND simulation code. Their spectra point spread functions as well as the original, penetration, scattering, and X-rays curves were drawn and analyzed. The parameters full-width at half maximum and full-width at tenth maximum were also investigated. Results: The original, penetration, and scatter curves within 10% for LEHR were 34.46%, 33.52%, 17.29%, and 14.72%, respectively. Similarly, the original, penetration, scatter, and X-rays within 10% for ME and HE were 83.06%, 10.25%, 6.69%, and 0% and 81.44%, 11.51%, 7.05%, and 0%, respectively. The trade-off between spatial resolution and sensitivity was achieved by using the ME collimator at 185 photopeak of Ga-67. Conclusion: The Monte Carlo simulation outcomes can be applied for optimal collimator designing and for the development of new correction method in Ga-67 imaging.

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Section: Resultsmentioning

confidence: 92%