원저 : 양전자방출단층촬영기의 표준 성능평가 방법 : GE AdvanceTM 에 적용한 예 ( performance Measurements of Positron Emission Tomography : An Investigation Using General Electric Advance ) () |
Author |
이정림(J . R . Lee),최용(Y . Choi),최연성(Y . S . Choe),이경한(K . H . Lee),김상은(S . E . Kim),신승애(S . A . Shin),김병태(B . T . Kim), |
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Affiliation |
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Abstract |
A series of performance measurements of positron
emission tomography (PET) were performed following the
recommendations of the Computer and Instrumentation
Council of the Society of Nuclear Medicine and the
National Electrical Manufacturers Association. We
investigated the performance of the General Electric
AdvanceTM PET. The measurements include the basic
intrinsic tests of spatial resolution, scatter
fraction, sensitivity, and count rate losses and
randoms. They also include the tests of the accuracy of
corrections: count rate linearity correction,
uniformity correction, scatter correction and
attenuation correction. GE AdvanceTM PET has bismuth
germanate oxide crystals (4.0mm transaxial × 8.lmm
axial × 30.0mm radial) in 18 rings, which form 35
imaging planes spaced by 4.25mm. The system has
retractable tungsten septa 1mm thick and 12cm long.
Transaxial resolution was 4.92mm FWHM in 2D and 5.14mm
FWHM in 3D at the center. Average axial resolution in
2D decreased from 3.91mm FWHM at the center to 6.49mm
FWHM at R=20cm. Average scatter fraction of direct and
cross slices was 9.57%. Dead-time losses of 50%
corresponded to a radioactivity concentration of
4.86μCi/cc and a true count rate of 519 kcps in 2D.
The accuracy of count rate linearity correction was
1.84% at the activity of 4.50μCi/cc. Non-uniformity
was 2.06% in 2D and 2.93% in 3D. Remnant errors after
scatter correction were 0.55% in 2D and 4.12% in 3D.
The errors of attenuation correction were 6.21% (air),
0.20% (water), -6.32% (teflon) in 2D and 5.00% (air),
6.94% (water), 3.01% (teflon) in 3D. The results
indicate the performance of GE AdvanceTM PET scanner to
be well suited for clinical and research applications. |
Keyword |
Positron Emission Tomography (PET), performance standards, resolution, scatter, sensitivity, count rate, uniformity, attenuation |
Full text Article |
28501820.pdf
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