Basic Evaluation of Sampling Step Angle and Spatial Resolution in Continuous Rotating Acquisition with SPECT

Kangai, Yoshiharu; Nagaki, Akio; Matsutomo, Norikazu; Sugino, Shuichi; Ohata, Yasushi; Mimura, Hiroaki; Onishi, Hideo

doi:10.6009/jjrt.67.221

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…Cao et al (15) reported that the image quality of CRRA was similar to that of the SS mode. In addition, Kangai et al (16) showed that the FWHM obtained with an optimal sampling step angle did not differ between CRRA and the SS mode. Our results agree with those of the previous studies and indicate that CRRA is appropriate for 123 I-FP-CIT SPECT imaging.…”

Section: Discussionmentioning

confidence: 99%

Continuous Repetitive Data Acquisition with ¹²³I-FP-CIT SPECT: Effects of Rotation Speed and Rotation Time

Matsutomo

Takano

Yamamoto

et al. 2019

J. Nucl. Med. Technol.

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The aim of this study was to evaluate the effects of the acquisition rotation speed and the rotation time for continuous repetitive rotation acquisition (CRRA) on image quality and quantification in 123 I-FP-CIT SPECT. Methods: An anthropomorphic striatal phantom filled with 123 I solution was acquired with CRRA and the stepand-shoot (SS) mode. The following combinations of acquisition rotation speed and rotation time for CRRA were used: 0.50 rpm by 30 frames, 0.17 rpm by 10 frames, 0.10 rpm by 6 frames, and 0.05 rpm by 3 frames. SPECT images were reconstructed using ordered-subset expectation maximization with resolution recovery, scatter, and CT-based attenuation correction. Two kinds of image processing patterns-image reconstruction after the addition of projection data (the added-projection-data process) and image addition after data reconstruction (the added-reconstructed-image process)-were investigated in this study. The effects of the acquisition parameters and the image processes were evaluated by the full width at half maximum, percentage coefficient of variation (%CV), and specific binding ratio (SBR). Results: With full width at half maximum, there were no clear differences between CRRA images obtained with the various rotation speeds before rotation and the SS mode. Although the combination of a slow rotation speed and a short rotation time improved image uniformity compared with the SS mode, the %CV obtained by CRRA increased as the rotation speed increased. The %CVs were 11.9% ± 0.9% for 0.50 rpm by 30 frames, 6.9% ± 0.9% for 0.05 rpm by 3 frames, and 9.6% ± 0.5% for SS mode. SBRs obtained by CRRA with the added-projection-data process were equal to those obtained by SS mode. However, SBRs obtained with the added-reconstructed-image process were clearly decreased compared with the SS mode. Conclusion: The combination of rotation speed and rotation times affects the image quality and quantification of 123 I-FP-CIT SPECT using CRRA. When CRRA is applied in 123 I-FP-CIT SPECT, it is necessary to use added-projection-data processes and proper rotation speeds (e.g., 0.10-0.17 rpm rotation speed).

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Section: Discussionmentioning

confidence: 99%

Continuous Repetitive Data Acquisition with ¹²³I-FP-CIT SPECT: Effects of Rotation Speed and Rotation Time

Matsutomo

Takano

Yamamoto

et al. 2019

J. Nucl. Med. Technol.

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Fluctuation of quantitative values on acquisition time and the reconstruction conditions in 99mTc-SPECT

Tsujimoto¹,

Shirakawa²,

Teramoto³

et al. 2018

Nuclear Medicine Communications

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Determination of Bone SPECT Image Reconstruction Conditions in the Head and Neck Region

Naoya

Tokorodani

Kenda

et al. 2021

Nippon Hoshasen Gijutsu Gakkai Zasshi

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Quantitative analysis using a standardized uptake value (SUV) has become possible for singlephoton emission computed tomography-computed tomography (SPECT-CT) of bone. However, previous research was targeted to the trunk area, and there are few studies for the head and neck region. Therefore, the purpose of this study was to determine the optimal image reconstruction conditions for bone SPECT of the head and neck using a phantom study. Method: The radioactivity concentration of the 99m Tc solution enclosed in the cylindrical phantom was set to the same count rate as in clinical cases, and six hot spheres (10, 13, 17, 22, 28, 37 mm) with four times the concentration were placed within it. The image reconstruction was 3D-OSEM, and the reconstruction conditions were varied by the number of iterative updates and the width of the Gaussian filter. Quantitative evaluations of the image quality were performed using the % contrast, background variability, and SUV for the hot spheres and background. A visual evaluation was performed by four observers to determine the optimal image reconstruction conditions for bone SPECT of the head and neck region. Result: The concentration of the 99m Tc solution enclosed in the phantom was 6.95 (kBq/ml). Based on the results of the quantitative and visual evaluations, the optimal image reconstruction conditions were iterative updates=60 (subset: 10, iteration: 6) and a Gaussian filter of 7.8 mm. Conclusion:The optimal image reconstruction conditions were subset=10, iterations=6, and a Gaussian filter of 7.8 mm.

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Basic Evaluation of Sampling Step Angle and Spatial Resolution in Continuous Rotating Acquisition with SPECT

Cited by 5 publications

References 8 publications

Continuous Repetitive Data Acquisition with ¹²³I-FP-CIT SPECT: Effects of Rotation Speed and Rotation Time

Continuous Repetitive Data Acquisition with ¹²³I-FP-CIT SPECT: Effects of Rotation Speed and Rotation Time

Fluctuation of quantitative values on acquisition time and the reconstruction conditions in 99mTc-SPECT

Determination of Bone SPECT Image Reconstruction Conditions in the Head and Neck Region

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Basic Evaluation of Sampling Step Angle and Spatial Resolution in Continuous Rotating Acquisition with SPECT

Cited by 5 publications

References 8 publications

Continuous Repetitive Data Acquisition with 123I-FP-CIT SPECT: Effects of Rotation Speed and Rotation Time

Continuous Repetitive Data Acquisition with 123I-FP-CIT SPECT: Effects of Rotation Speed and Rotation Time

Fluctuation of quantitative values on acquisition time and the reconstruction conditions in 99mTc-SPECT

Determination of Bone SPECT Image Reconstruction Conditions in the Head and Neck Region

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Product

Resources

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Continuous Repetitive Data Acquisition with ¹²³I-FP-CIT SPECT: Effects of Rotation Speed and Rotation Time

Continuous Repetitive Data Acquisition with ¹²³I-FP-CIT SPECT: Effects of Rotation Speed and Rotation Time