OBJECTIVE: This study demonstrates images obtained by (90)Y bremsstrahlung emission computed tomography (BECT), and characterizes the system performance of gamma cameras. METHODS: (90)Y BECT images of phantoms were acquired using a gamma camera equipped with a medium energy general purpose parallel-hole collimator. Three energy window widths of 50% (57-94 keV) centered at 75 keV, 30% (102-138 keV) at 120 keV, and 50% (139-232 keV) at 185 keV were set on a (90)Y bremsstrahlung spectrum. The images obtained with three energy windows were reconstructed using filtered back projection (FBP) and ordered subsets expectation maximization (OSEM) methods. The images of the sum window were obtained by fusing the images of the 75, 120, and 185 keV windows. RESULTS: The OSEM method improved the full width at half maximum by 20% and the standard deviation by 9% compared with the FBP method. BECT displayed (90)Y biodistribution and quantified (90)Y activity. BECT images obtained with OSEM method using the 120 keV window showed the highest resolution and lowest uncertainty. The sum window showed the highest sensitivity, while its resolution was 10% inferior to that of the 120 keV window. One whole-body image can be taken over 100 min using the sum window. An absorber to cover the body surface reduced background by 30%. CONCLUSIONS: (90)Y BECT imaging can be used for patient assessment without modifying current treatment procedures.
OBJECTIVE: This study demonstrates images obtained by (90)Y bremsstrahlung emission computed tomography (BECT), and characterizes the system performance of gamma cameras. METHODS: (90)Y BECT images of phantoms were acquired using a gamma camera equipped with a medium energy general purpose parallel-hole collimator. Three energy window widths of 50% (57-94 keV) centered at 75 keV, 30% (102-138 keV) at 120 keV, and 50% (139-232 keV) at 185 keV were set on a (90)Y bremsstrahlung spectrum. The images obtained with three energy windows were reconstructed using filtered back projection (FBP) and ordered subsets expectation maximization (OSEM) methods. The images of the sum window were obtained by fusing the images of the 75, 120, and 185 keV windows. RESULTS: The OSEM method improved the full width at half maximum by 20% and the standard deviation by 9% compared with the FBP method. BECT displayed (90)Y biodistribution and quantified (90)Y activity. BECT images obtained with OSEM method using the 120 keV window showed the highest resolution and lowest uncertainty. The sum window showed the highest sensitivity, while its resolution was 10% inferior to that of the 120 keV window. One whole-body image can be taken over 100 min using the sum window. An absorber to cover the body surface reduced background by 30%. CONCLUSIONS: (90)Y BECT imaging can be used for patient assessment without modifying current treatment procedures.
Authors: Stephan Walrand; Glenn D Flux; Mark W Konijnenberg; Roelf Valkema; Eric P Krenning; Renaud Lhommel; Stanislas Pauwels; Francois Jamar Journal: Eur J Nucl Med Mol Imaging Date: 2011-03-11 Impact factor: 9.236
Authors: Mattijs Elschot; Johannes Franciscus Wilhelmus Nijsen; Alida Johanna Dam; Hugo Wilhelmus Antonius Maria de Jong Journal: PLoS One Date: 2011-11-03 Impact factor: 3.240
Authors: Yung-Hsiang Kao; Jeffrey D Steinberg; Young-Soon Tay; Gabriel Ky Lim; Jianhua Yan; David W Townsend; Angela Takano; Mark C Burgmans; Farah G Irani; Terence Kb Teo; Tow-Non Yeow; Apoorva Gogna; Richard Hg Lo; Kiang-Hiong Tay; Bien-Soo Tan; Pierce Kh Chow; Somanesan Satchithanantham; Andrew Eh Tan; David Ce Ng; Anthony Sw Goh Journal: EJNMMI Res Date: 2013-07-25 Impact factor: 3.138
Authors: Mattijs Elschot; Bart J Vermolen; Marnix G E H Lam; Bart de Keizer; Maurice A A J van den Bosch; Hugo W A M de Jong Journal: PLoS One Date: 2013-02-06 Impact factor: 3.240