CT tube current for attenuation map in a combined PET/CT system: obese patient simulated phantom study

Annals of Nuclear Medicine
Akio NagakiNorikazu Matsutomo

Abstract

The CT portion of PET/CT provides attenuation correction of the PET emission scan. This study was performed to evaluate how much the CT tube current can be lowered while still providing attenuation maps on PET images. Two body phantoms (outside diameters of 300 and 500 mm) were used to investigate, and PET/CT acquisitions were performed with an Aquiduo PCA-7000B (Toshiba Medical Systems, Otawara, Japan). The CT scan was performed with the following parameters (120 kVp; 0.5-s rotation; 10, 20, 40, 80, 160, 200, 320, 460 mA). After the CT scan, PET images for (18)F-FDG (5.3 kBq/mL) were obtained for 4 min/bed position. The linear attenuation coefficients for (18)F-FDG in 300- and 500-mm phantoms, pixel values and SD of CT images, radioactivity concentration values and hot- and cold-sphere contrast on PET images in the 500-mm phantom were evaluated. In the 300-mm phantom, all eight tube currents gave average linear attenuation coefficients of approximately 0.095 cm(-1). In contrast, the average linear attenuation coefficients of the 500-mm phantom at 10, 20, and 40 mA were significantly decreased (0.081, 0.087, and 0.092 cm(-1), respectively; p < 0.05) as compared to 0.096 cm(-1) of the other tube currents. Further, CT pixel value...Continue Reading

References

May 11, 2002·European Journal of Nuclear Medicine and Molecular Imaging·Ehab KamelAlfred Buck
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Oct 10, 2003·European Journal of Nuclear Medicine and Molecular Imaging·Tung-Hsin WuTieh-Chi Chu
Apr 9, 2008·Seminars in Nuclear Medicine·David W Townsend
May 17, 2008·Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine·David W Townsend
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Sep 18, 2010·Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine·Rameshwar PrasadHabib Zaidi

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