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KMID : 0861420120160020044
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Korean Journal of Nuclear Medicine Technology
2012 Volume.16 No. 2 p.44 ~ p.48
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Correction of Artifacts due to Patient Arm Motion in PET/CT: Scatter-Limit Correction
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Bahn Young-Kag
Lee Seung-Jae
Kim Jung-Yul
Oh Shin-Hyun
Namkoong Hyuk
Park Hoon-Hee
Kang Chun-Koo
Lim Han-Sang
Lee Chang-Ho
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Abstract
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Purpose:Arm motion can give rise to striking cold artifact on PET/CT. We investigated that evaluation of
scatter-limit correction and correct the patient arm motion artifact in Discovery 600 PET/CT. Materials and
Methods:To evaluate a radioactivity uptake (Bq/ml) and a standard uptake value (SUV), the scatter limit
correction and scatter correction were compared using 1994 NEMA Phantom TM in Discovery 600 PET / CT (GE
Healthcare, Mi, We). Arm motion phantom study was involved a central 20 cm diameter cylinder simulating the
neck and 2 peripheral 10 cm diameter cylinders simulating arms. The positions of the arms were altered so as to
introduce different amounts of misalignment. The evaluation of arm motion phantom study used the
radioactivity uptake and SUV in scatter correction and scatter limit correction.
Results:The statistical significance of radioactivity uptake and SUV did not show the differences in comparisons of the scatter limit correction and the scatter correction that not show (p<0.05). Radioactivity uptake of the scatter correction was up to 3.1 kBq/ml in the 0.04 kBq/ml. It was approximately 98.7% undervalued in the arm motion phantom study.
However, Radioactivity uptake of the scatter limit correction was up to 3.0 kBq/ml in the 2.11 kBq/ml. It was
approximately 30% undervalued in arm motion phantom study. SUV of the scatter correction was 1.05 to 0.006
and underestimated about 98%. However, an applying SUV of the scatter limit correction changed the value as
0.67 which is underestimated about 25%. Radioactivity uptake and SUV of the scatter limit correction was
increased approximately 60%, or more than the scatter correction.
Conclusion:It is considered that if the patient arm motion artifact was occurred the scatter limit correction will be applicable to give an accurate diagnosis.
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KEYWORD
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PET/CT, Scatter limit correction method, Arm motion artifact
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