Comparative assessment of the accuracy of maximum likelihood and correlated signal enhancement algorithm positioning methods in gamma camera with large square photomultiplier tubes

Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
View: 299

This Paper With 6 Page And PDF Format Ready To Download

  • Certificate
  • من نویسنده این مقاله هستم

استخراج به نرم افزارهای پژوهشی:

لینک ثابت به این Paper:

شناسه ملی سند علمی:

JR_IRJNM-27-2_003

تاریخ نمایه سازی: 19 بهمن 1398

Abstract:

Introduction: The gamma cameras, based on scintillation crystal followed by an array of photomultiplier tubes (PMTs), play a crucial role in nuclear medicine. The use of square PMTs provides the minimum dead zones in the camera. The camera with square PMTs also reduces the number of PMTs relative to the detection area. Introduction of a positioning algorithm to improve the spatial resolution in the detector with square PMT have been of interest in recent years. Methods: In this study, the maximum-likelihood and correlated signal enhancement positioning methods were implemented in a camera with square PMTs. The developed camera consists of 3/8 thick monolithic NaI(Tl) crystal coupled to the array of 76mm sized PMTs. The comparison is based on measuring full width at half maximum (FWHM) and standard deviation of FWHM of point sources in a 15×15 grid of samples with 2-mm grid spacing, produced using MLE and CSE positioning methods. Results:The intrinsic spatial resolution in (x, y) directions was (3.8, 3.8), (4.3, 4.5) mm for CSE and MLE methods respectively. Also, the standard deviations was almost the same in both methods (0.5 and 0.6 for CSE and MLE respectively). Although by applying MLE method, the resolution degrades by 16% but the produced image introduced acceptable quality. Conclusion: The results show the MLE method presented acceptable performance in comparison to CSE method as reference in the detector with large square PMTs. Note that the MLE method does not require any linearity correction process because it can estimate the exact position of events.

Authors

Behnoosh Teimourian Fard

Department of Energy Engineering and Physics, Amirkabir University of Technology, Tehran, Iran|Research Center for Molecular and Cellular Imaging, Tehran University of Medical Sciences, Tehran, Iran

Mojtaba Shamsaei Zafarghandi

Department of Energy Engineering and Physics, Amirkabir University of Technology, Tehran, Iran

مراجع و منابع این Paper:

لیست زیر مراجع و منابع استفاده شده در این Paper را نمایش می دهد. این مراجع به صورت کاملا ماشینی و بر اساس هوش مصنوعی استخراج شده اند و لذا ممکن است دارای اشکالاتی باشند که به مرور زمان دقت استخراج این محتوا افزایش می یابد. مراجعی که مقالات مربوط به آنها در سیویلیکا نمایه شده و پیدا شده اند، به خود Paper لینک شده اند :
  • Anger HO. Scintillation camera. Rev Sci Instrum. 1958;29:27-33. ...
  • Peterson TE, Furenlid LR. SPECT detectors: the Anger camera and ...
  • Pani R, Pellegrini R, Soluri A, De Vincentis G, Scafe ...
  • Flower MA. Webb s physics of medical imaging. 2nd ed. ...
  • Barrett HH, Hunter WC, Miller BW, Moore SK, Chen Y, ...
  • Gray RM Macovski A. Maximum a posteriori estimation of position ...
  • Moore S, Hunter W, Furenlid L, Barrett H. Maximum-likelihood estimation ...
  • Galasso M, Fabbri A, Borrazzo C, Cencelli VO, Pani R. ...
  • Jansen FP, Binnie DM. Signal processing in scintillation cameras for ...
  • Zeraatkar N, Sajedi S, Fard BT, Kaviani S, Akbarzadeh A, ...
  • Barrett HH. Detectors for small-animal SPECT II, statistical limitations and ...
  • Anger HO. Scintillation camera with multichannel collimators. J Nucl Med.1964;5:515-531. ...
  • Barrett HH, Myers KJ. Foundations of image science. John Wiley ...
  • Chen JC, Barrett HH. Likelihood window, energy window, and Bayesian ...
  • Chen JC: Modular gamma cameras: Improvements in scatter rejection, and ...
  • ChenJC. Scatter rejection in modular gamma cameras for use in ...
  • Fessler JA, Rogers WL, Clinthorne NH, Robust maximum-likelihood position estimation ...
  • Bruyndonckx P, Léonard S, Tavernier S, Lemaître C, Devroede D, ...
  • Talat D Guvenis A. Artificial neural network based positioning algorithm ...
  • Conde P, Iborra A, González A, Hernández L, Bellido P, ...
  • نمایش کامل مراجع