scholarly journals Scatter Fraction of the J-PET Tomography Scanner

2016 ◽  
Vol 47 (2) ◽  
pp. 549 ◽  
Author(s):  
P. Kowalski ◽  
W. Wiślicki ◽  
L. Raczyński ◽  
D. Alfs ◽  
T. Bednarski ◽  
...  
Keyword(s):  
Scatter Fraction

scholarly journals RELATION BETWEEN THE POSITION OF LEAD DISKS AND MEASURED VALUES OF THE SCATTER FRACTION FOR THE DISK METHOD

1991 ◽  
Vol 47 (5) ◽  
pp. 709-713 ◽  
Author(s):  
HIROSHI INATSU ◽  
MASAMI UEDA ◽  
TOSHIYA AZUMA ◽  
AKIRA MITARAI ◽  
HIDEO ARITA
Keyword(s):  
Scatter Fraction ◽  
Disk Method

scholarly journals TLD measurements and Monte Carlo simulations for glandular dose and scatter fraction assessment in mammography: A comparative study

2011 ◽  
Vol 46 (10) ◽  
pp. 1103-1108 ◽  
Author(s):  
S. Di Maria ◽  
S. Barros ◽  
J. Bento ◽  
P. Teles ◽  
C. Figueira ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Comparative Study ◽  
Monte Carlo Simulations ◽  
Scatter Fraction

The effect of camera geometry on singles flux, scatter fraction and trues and randoms sensitivity for cylindrical 3D PET-a simulation study

2000 ◽  
Vol 47 (3) ◽  
pp. 1228-1232 ◽  
Author(s):  
R.D. Badawi ◽  
S.G. Kohlmyer ◽  
R.L. Harrison ◽  
S.D. Vannoy ◽  
T.K. Lewellen
Keyword(s):  
Simulation Study ◽  
Scatter Fraction ◽  
3D Pet

PET/CT BiographTM Sensation 16

2006 ◽  
Vol 45 (03) ◽  
pp. 126-133 ◽  
Author(s):  
Y. Bercier ◽  
M. Schwaiger ◽  
S. I. Ziegler ◽  
M.-J. Martínez
Keyword(s):  
Image Quality ◽  
Count Rate ◽  
Signal To Noise Ratio ◽  
Reconstruction Algorithm ◽  
Considerable Change ◽  
Acquisition Time ◽  
Average Increase ◽  
Scatter Fraction ◽  
Pet Ct ◽  
Before And After

SummaryAim: The new PET/CT Biograph Sensation 16 (BS16) tomographs have faster detector electronics which allow a reduced timing coincidence window and an increased lower energy threshold (from 350 to 400 keV). This paper evaluates the performance of the BS16 PET scanner before and after the Pico-3D electronics upgrade. Methods: Four NEMA NU 2–2001 protocols, (i) spatial resolution, (ii) scatter fraction, count losses and random measurement, (iii) sensitivity, and (iv) image quality, have been performed. Results: A considerable change in both PET count-rate performance and image quality is observed after electronics upgrade. The new scatter fraction obtained using Pico-3D electronics showed a 14% decrease compared to that obtained with the previous electronics. At the typical patient background activity (5.3 kBq/ml), the new scatter fraction was approximately 0.42. The noise equivalent count-rate (RNEC) performance was also improved. The value at which the RNEC curve peaked, increased from 3.7·104s-1 at 14 kBq/ml to 6.4·104s-1 at 21 kBq/ml (2R-NEC rate). Likewise, the peak true count-rate value increased from 1.9·105s-1 at 22 kBq/ml to 3.4·105s-1 at 33 kBq/ml. An average increase of 45% in contrast was observed for hot spheres when using AW-OSEM (4ix8s) as the reconstruction algorithm. For cold spheres, the average increase was 12%. Conclusion: The performance of the PET scanners in the BS16 tomographs is improved by the optimization of the signal processing. The narrower energy and timing coincidence windows lead to a considerable increase of signal- to-noise ratio. The existing combination of fast detectors and adapted electronics in the BS16 tomographs allow imaging protocols with reduced acquisition time, providing higher patient throughput.

Effect of energy resolution on scatter fraction in scintigraphic imaging: Monte Carlo study

1993 ◽  
Vol 20 (4) ◽  
pp. 1107-1113 ◽  
Author(s):  
Akihiro Kojima ◽  
Masanori Matsumoto ◽  
Mutsumasa Takahashi ◽  
Shuzo Uehara
Keyword(s):  
Monte Carlo ◽  
Energy Resolution ◽  
Monte Carlo Study ◽  
Scintigraphic Imaging ◽  
Scatter Fraction
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