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KMID : 0861420110150020053
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Korean Journal of Nuclear Medicine Technology
2011 Volume.15 No. 2 p.53 ~ p.59
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Evaluation of Dosimetry and Image of Very Low Dose CT Attenuation Correction for Pediatric PET/CT: Phantom Study
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Bahn Young-Kag
Kim Jung-Yul
Park Hoon-Hee
Kang Chun-Koo
Lim Han-Sang
Lee Chang-Ho
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Abstract
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Purpose:To evaluate the dosimetry and image of very low does CT attenuation correction for phantom using
pediatric PET/CT.
Materials and Methods:three PET / CT scanners (Discovery STe, BiographTruepoint 40,
Discovery 600) as a child-size acrylic phantom and ion chamber dosimeter (Unfous Xi CT, Sweden) using a CT
image acquisition parameters (10, 20, 40, 80, 100, 160 mA; 80, 100, 120, 140 kVp) by varying the depth dose
and evaluate CTDIvol value. And each attenuation corrected PET/CT images used NEMA PET Phantom™
(NU2-1994) was evaluated by SUV.
Results:Abdominal diagnosis CT dose in general pediatric (about 10 ages)
parameter (100 kVp, 100 mA) than very low dose CT parameter (80 kVp, 10 mA) at the depth dose was reduced
approximately 92%, CTDIvol was reduced to about 88%. Each CT attenuation corrected parameters PET images
showed no change in the value of SUV.
Conclusion:for pediatric patients, PET/CT scan can be obtained with
very low dose attenuation correction CT (80 kVp, 10 mA), and such attenuation correction CT dose was reduced
100 fold than diagnosis CT dose. PET / CT scan used very low dose CT attenuation correction in pediatric
patients can be helpful in reducing radiation dose.
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KEYWORD
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PET / CT, Pediatric, Phantom, Dose
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