- 期刊
正子電腦斷層造影中CT之管電壓及管電流對SUV值的影響
Evaluation of SUV in the Effect of CT Tube Currents and Voltages in PET/CT Scan
摘要
The objective of this study was to evaluate standardized uptake value (SUV) in the effect of tube currents and voltages of computed tomography (CT) correlating to positron emission tomography (PET) image quality in PET/CT scan. Positron emission tomography-computed tomography (PET/CT) scan has become an important and appealing medical examination for clinical application in recent years. Germanium-68 is the typical application to improve attenuation correction. Yet CT offers shorter scanning time, improves attenuation correction while obtaining explicit CT images for anatomical localization. Under the condition that different CT tube currents and voltages affect the quality of CT images, PET images and SUVs correlating to CT conditions should be taken into consideration with the aim of reducing radiation doses for the examinees as well as maintaining explicit image quality for diagnostic interpretation. We assembled twenty one patients who underwent radiotherapy due to head and neck cancer in this study. We reviewed their clinical information and divided them into two groups according to different CT conditions. Group A consisted of eleven patients, scanned under CT condition of 40mAs, 90kVp and 140kVp. Group B consisted of ten patients, scanned under CT condition of 140kVp, 40mAs and 100mAs. Region-of-interest (ROI) was circled artificially in both groups: parietal lobe, occipital lobe, cerebellum and tumor. Max and Mean SUVs of both groups were recorded for comparison. Statistics of 220 and 200 were obtained in Group A and Group B respectively for ROI SUV analysis. The result has shown that SUVs were not varied (p＞0.05) because of different CT conditions. According to our finding, better image quality was obtained due to higher CT conditions, but it did not affect SUVs. Therefore, CT images produced under different CT conditions are applicative for different cases in clinical diagnosis since radiation conditions do not affect PET image interpretation. For example, if CT images are obtained with the orientation of anatomical alignment instead of that of the detailed clinical diagnosis, PET/CT images and SUV obtained by lower CT conditions remain applicative for clinical diagnosis.
並列摘要
The objective of this study was to evaluate standardized uptake value (SUV) in the effect of tube currents and voltages of computed tomography (CT) correlating to positron emission tomography (PET) image quality in PET/CT scan. Positron emission tomography-computed tomography (PET/CT) scan has become an important and appealing medical examination for clinical application in recent years. Germanium-68 is the typical application to improve attenuation correction. Yet CT offers shorter scanning time, improves attenuation correction while obtaining explicit CT images for anatomical localization. Under the condition that different CT tube currents and voltages affect the quality of CT images, PET images and SUVs correlating to CT conditions should be taken into consideration with the aim of reducing radiation doses for the examinees as well as maintaining explicit image quality for diagnostic interpretation. We assembled twenty one patients who underwent radiotherapy due to head and neck cancer in this study. We reviewed their clinical information and divided them into two groups according to different CT conditions. Group A consisted of eleven patients, scanned under CT condition of 40mAs, 90kVp and 140kVp. Group B consisted of ten patients, scanned under CT condition of 140kVp, 40mAs and 100mAs. Region-of-interest (ROI) was circled artificially in both groups: parietal lobe, occipital lobe, cerebellum and tumor. Max and Mean SUVs of both groups were recorded for comparison. Statistics of 220 and 200 were obtained in Group A and Group B respectively for ROI SUV analysis. The result has shown that SUVs were not varied (p＞0.05) because of different CT conditions. According to our finding, better image quality was obtained due to higher CT conditions, but it did not affect SUVs. Therefore, CT images produced under different CT conditions are applicative for different cases in clinical diagnosis since radiation conditions do not affect PET image interpretation. For example, if CT images are obtained with the orientation of anatomical alignment instead of that of the detailed clinical diagnosis, PET/CT images and SUV obtained by lower CT conditions remain applicative for clinical diagnosis.
延伸閱讀
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