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KMID : 1143620170210020031
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Korean Journal of Nuclear Medicine Technology
2017 Volume.21 No. 2 p.31 ~ p.36
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The Usefulness of Q.Clear Technique in PET / CT
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Choi Yong-Hoon
Kim Jung-Yul
Choi Young-Sook
Lim Han-Sang
Kim Jae-Sam
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Abstract
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Purpose : Recently, the performance of PET/CT scanner has been improved and various techniques have been developed to increase the image quality such as Sensitivity and Resolution. The purpose of this study is to evaluate the
usefulness of Q.Clear (a fully convergent iterative reconstruction) technique of GE Discovery IQ equipment to enhance the image quality/
Materials and Methods : All scans were acquired by Discovery IQ (GE Healthcare, MI, USA). In NEMA IEC Body Phantom test, Background to Hot-sphere (10 ㎜, 13 ㎜, 17 ㎜, 22 ㎜) ratio was 1:4 and scan time was 3 minutes. The images were reconstructed by VPHDs (VUE Point High-Definition + SharpIR) and Q.Clear to evaluate each Contrast. We injected 18F-FDG 187 M㏃ to PET/SPECT Performance Phantom. And then it was scanned for 4 minutes to evaluate Resolution and Uniformity. T-test statistical analysis was performed on SUVmax of small lesions less than 2 ㎝ in 100 clinical patients regardless of disease type.
Results : In the NEMA IEC Body Phantom, the Contrast was 63.6 ± 5.7% (VPHDs) and 75 ± 4.8% (Q.Clear). In the PET/SPECT Performance Phantom, the Resolution was 9.2 ㎜ (VPHDs) and 7.3 ㎜ (Q.Clear). Uniformity of Q.Clear was 10.8% better than VPHDs. T-test statistic of the clinical patients showed a significant difference of p value of 0.021.
Conclusion : Both the phantom test and the clinical results showed that the quality of the image was improved in Q.Clear was applied. The SUVmax was highly measured in Q.Clear and the lesions were clearly distinguished visually. Therefore Q.Clear can be useful in various aspects such as dose-reduction, patients evaluation and image analysis.
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KEYWORD
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Q.Clear, VPHDs, SUVmax
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