Quality control in dual head gamma-cameras: Comparison between methods and software used for image analysis

Edam, A.N.; Fornasier, Maria Rosa; Denaro, Mario de; Sulieman, Abdelmoneim; Alkhorayef, M.; Bradley, D.A.

doi:10.1016/j.apradiso.2018.07.027

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Point source images were reconstructed using Tera-Tomo™ 3D SPECT-Q with the settings and post filters described above, except for using 1.8 mm voxel size. ImageJ NMQC plugin [ 47 ] was used to calculate FWHM and FWTM on each reconstructed image set. Mean and Standard Deviation (St.Dev.)…”

Section: Methodsmentioning

confidence: 99%

Performance evaluation of a novel multi-pinhole collimator on triple-NaI-detector SPECT/CT for dedicated myocardial imaging

et al. 2023

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Background In this study we evaluated the imaging capabilities of a novel Multi-pinhole collimator (MPH-Cardiac) specially designed for nuclear cardiology imaging on a Triple-NaI-detector based SPECT/CT system. Methods 99mTc point source measurements covering the field of view (FOV) were used to determine tomographic sensitivity (TSpointsource) and spatial resolution. Organ-size tomographic sensitivity (TSorgan) was measured with a left ventricle (LV) phantom filled with typical myocardial activity of a patient scan. Reconstructed image uniformity was measured with a 140 mm diameter uniform cylinder phantom. Using the LV phantom once filled with 99mTc and after with 123I, Contrast-to-noise ratio (CNR) was measured on the reconstructed images by ROI analysis on the myocardium activity and on the LV cavity. Furthermore, a polar map analysis was performed determining Spill-Over-Ratio in water (SORwater) and image noise. The results were compared with that of a dual-head parallel-hole low energy high resolution (LEHR) collimator system. A patient with suspected coronary artery disease (CAD) was scanned on the LEHR system using local protocol of 16 min total acquisition time, followed by a 4-min MPH-Cardiac scan. Results Peak TSpointsource was found to be 1013 cps/MBq in the axial center of the FOV while it was decreasing toward the radial edges. TSorgan in the CFOV was found to be 134 cps/MBq and 700 cps/MBq for the LEHR and MPH-Cardiac, respectively. Average spatial resolution throughout the FOV was 4.38 mm FWHM for the MPH-Cardiac collimator. Reconstructed image uniformity values were found to be 0.292% versus 0.214% for the LEHR and MPH-Cardiac measurements, respectively. CNR was found to be higher in case of MPH-Cardiac than for LEHR in case of 99mTc (15.5 vs. 11.7) as well as for 123I (13.5 vs. 8.3). SORwater values were found to be 28.83% and 21.1% for the 99mTc measurements, and 31.44% and 24.33% for the 123I measurements for LEHR and MPH-Cardiac, respectively. Pixel noise of the 99mTc polar maps resulted in values of 0.38% and 0.24% and of the 123I polar maps 0.62% and 0.21% for LEHR and MPH-Cardiac, respectively. Visually interpreting the patient scan images, MPH-Cardiac resulted in better image contrast compared to the LEHR technique with four times shorter scan duration. Conclusions The significant image quality improvement achieved with dedicated MPH-Cardiac collimator on triple head SPECT/CT system paves the way for short acquisition and low-dose cardiovascular SPECT applications.

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Section: Methodsmentioning

confidence: 99%

Performance evaluation of a novel multi-pinhole collimator on triple-NaI-detector SPECT/CT for dedicated myocardial imaging

et al. 2023

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“…Point source images were reconstructed using Tera-Tomo™ 3D SPECT-Q with the settings and post lters described above, except for using 1.8 mm voxel size. ImageJ NMQC plugin (39) was used to calculate FWHM and FWTM on each reconstructed image set. Mean and Standard Deviation (St.Dev.)…”

Section: Spatial Resolution Spatial Resolution Was Determined In Term...mentioning

confidence: 99%

Performance Evaluation of a Novel Multi-PinHole Collimator on Triple-detector SPECT/CT for dedicated myocardial imaging

Krizsán¹,

Kukuts²,

Al-Muhanna³

et al. 2022

Preprint

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BackgroundIn this study we evaluated the imaging capabilities of a novel Multi-pinhole collimator (MPH-Cardiac) specially designed for nuclear cardiology imaging on a triple head NaI(Tl) detector based SPECT/CT system.Methods99mTc point source measurements covering the field-of-view (FOV) were used to determine tomographic sensitivity (TSpointsource) and spatial resolution. Organ-size tomographic sensitivity (TSorgan) was measured with a left ventricle (LV) phantom filled with typical myocardial activity of a patient scan. Reconstructed image uniformity was measured with a 140 mm diameter uniform cylinder phantom. Using the LV phantom once filled with 99mTc and after with 123I, a polar map analysis was performed determining Spill-Over-Ratio in water (SORwater) and image noise. Results were compared with that of a dual-head parallel-hole low energy high resolution (LEHR) collimator system. A patient with suspected coronary artery disease (CAD) was scanned on the LEHR system using local protocol of 16 minutes total acquisition time, followed by a 4-minute MPH-Cardiac scan. ResultsPeak TSpointsource was found to be 1013 cps/MBq in the axial center of the FOV while it was decreasing towards the radial edges. TSorgan in the CFOV was found to be 134 cps/MBq and 700 cps/MBq for the LEHR and MPH-Cardiac respectively. Average spatial resolution throughout the FOV was 4.38 mm FWHM for the MPH-Cardiac collimator. Reconstructed image uniformity values were found to be 0.504 % versus 0.392 % for the LEHR and MPH-Cardiac measurements respectively. SORwater values were found to be 28.83% and 21.1 % for the 99mTc measurements, and 31.44 % and 24.33 % for the 123I measurements for LEHR and MPH-Cardiac respectively. Pixel noise of the 99mTc polar maps resulted in values of 0.38 % and 0.24 % and of the 123I polar maps 0.62 % and 0.21 % for LEHR and MPH-Cardiac respectively. Visually interpreting the patient scan images, MPH-Cardiac resulted in better image contrast compared to the LEHR technique with four times shorter scan duration.ConclusionsThe significant image quality improvement achieved with dedicated MPH-Cardiac collimator on triple head SPECT/CT system paves the way for short acquisition and low-dose cardiovascular SPECT applications.

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Current Sudan protective practice in diagnostic nuclear medicine and patient dose

Edam¹,

Sulieman

Tamam

et al. 2021

Radiation Physics and Chemistry

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Quality control in dual head gamma-cameras: Comparison between methods and software used for image analysis

Cited by 4 publications

References 11 publications

Performance evaluation of a novel multi-pinhole collimator on triple-NaI-detector SPECT/CT for dedicated myocardial imaging

Performance evaluation of a novel multi-pinhole collimator on triple-NaI-detector SPECT/CT for dedicated myocardial imaging

Performance Evaluation of a Novel Multi-PinHole Collimator on Triple-detector SPECT/CT for dedicated myocardial imaging

Current Sudan protective practice in diagnostic nuclear medicine and patient dose

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