Improvement of image quality using amplitude-based respiratory gating in PET-computed tomography scanning
Autor: | Chan-Rok Park, Joo-Ah Lee, Hyung-Jin Yang, Tae-Yoon Kim, Jung Soo Kim, Seok-Hwan Yoon |
---|---|
Rok vydání: | 2021 |
Předmět: |
Quality Control
Physics Respiratory-Gated Imaging Techniques Image quality General Medicine Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences Full width at half maximum 0302 clinical medicine Amplitude Duty cycle Positron Emission Tomography Computed Tomography 030220 oncology & carcinogenesis Distortion Image Processing Computer-Assisted Breathing Radiology Nuclear Medicine and imaging Tomography Biomedical engineering |
Zdroj: | Nuclear Medicine Communications. 42:553-565 |
ISSN: | 0143-3636 |
Popis: | OBJECTIVES This study sought to provide data supporting the expanded clinical use of respiratory gating by assessing the diagnostic accuracy of breathing motion correction using amplitude-based respiratory gating. METHODS A respiratory movement tracking device was attached to a PET-computed tomography scanner, and images were obtained in respiratory gating mode using a motion phantom that was capable of sensing vertical motion. Specifically, after setting amplitude changes and intervals according to the movement cycle using a total of nine combinations of three waveforms and three amplitude ranges, respiratory motion-corrected images were reconstructed using the filtered back projection method. After defining areas of interest in the acquired images in the same image planes, statistical analyses were performed to compare differences in standardized uptake value (SUV), lesion volume, full width at half maximum (FWHM), signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). RESULTS SUVmax increased by 89.9%, and lesion volume decreased by 27.9%. Full width at half maximum decreased by 53.9%, signal-to-noise ratio increased by 11% and contrast-to-noise ratio increased by 16.3%. Optimal results were obtained when using a rest waveform and 35% duty cycle, in which the change in amplitude in the respiratory phase signal was low, and a constant level of long breaths was maintained. CONCLUSIONS These results demonstrate that respiratory-gated PET-CT imaging can be used to accurately correct for SUV changes and image distortion caused by respiratory motion, thereby providing excellent imaging information and quality. |
Databáze: | OpenAIRE |
Externí odkaz: |