Medical Journal of The Islamic Republic of Iran (MJIRI)
Iran University of Medical Sciences
Tue, Jan 14, 2025
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Volume 34, Issue 1 (2-2020)
Med J Islam Repub Iran 2020 |
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Sarebani M, Shiran M B, Bitarafan-Rajabi A, Rastgoo F, Ojaghi Haghighi Z, Abbasian Ardakani A. The impact of frame numbers on cardiac ECG-gated SPECT images with interpolated extra frames using echocardiography. Med J Islam Repub Iran 2020; 34 (1) :408-414
URL: http://mjiri.iums.ac.ir/article-1-5476-en.html
URL: http://mjiri.iums.ac.ir/article-1-5476-en.html
Maghsoud Sarebani 
, Mohammad Bagher Shiran , Ahmad Bitarafan-Rajabi , Fereidoon Rastgoo , Zahra Ojaghi Haghighi , Ali Abbasian Ardakani
, Mohammad Bagher Shiran , Ahmad Bitarafan-Rajabi , Fereidoon Rastgoo , Zahra Ojaghi Haghighi , Ali Abbasian Ardakani
Department of Medical Physics, School of Medicine, Iran University of Medical Sciences, Tehran, Iran , shiran.m@iums.ac.ir
Abstract: (1772 Views)
Background: Cardiac echocardiography and cardiac ECG-gated single-photon emission computed tomography (SPECT) are the most common modalities for left ventricle (LV) volumes and function assessment. The temporal resolution of SPECT images is limited and an ECG provides better temporal resolution. This study investigates the impact of frame numbers on images in terms of qualitative and quantitative assessments.
Methods: In this study, 5 patients underwent echocardiography and cardiac ECG-gated SPECT imaging, and 5 standard views of the LV were recorded to determine LV walls boundaries and volumes. Also, 2 original images with 8 frames and 16 frames per cardiac cycle were recorded simultaneously in a single gantry orbit. Using the data extracted from the LV model, 8 extra new frames were created with interpolation between existing frames of the original 8-frame image. Three series of images (8 and 16 original and 16 interpolated) were reconstructed separately. LV volumes and ejection fraction (EF) were calculated using Quantitative Gated SPECT (QGS) software.
Results: Compared to the original 8-frame gating, original 16-frame gated images resulted in larger end-diastole volume (EDV) (mean ± SD: 68.6 ± 27.11 mL vs 66.2±25.41 mL, p<0.001), smaller end-systole volume (ESV) (mean ± SD: 24.6±8.7 mL vs 26±7.3 mL, p<0.001), and higher EF (64% vs 60.2%, p<0.001). The results for the interpolated series were also different from the original images (closer to the original 16-frame series rather than 8-frame).
Conclusion: Changing the frame number from 8 to 16 in cardiac ECG-gated SPECT images caused a significant change in LV volumes and EF. Frame interpolation with sophisticated algorithms can be used to improve the temporal resolution of SPECT images.
Methods: In this study, 5 patients underwent echocardiography and cardiac ECG-gated SPECT imaging, and 5 standard views of the LV were recorded to determine LV walls boundaries and volumes. Also, 2 original images with 8 frames and 16 frames per cardiac cycle were recorded simultaneously in a single gantry orbit. Using the data extracted from the LV model, 8 extra new frames were created with interpolation between existing frames of the original 8-frame image. Three series of images (8 and 16 original and 16 interpolated) were reconstructed separately. LV volumes and ejection fraction (EF) were calculated using Quantitative Gated SPECT (QGS) software.
Results: Compared to the original 8-frame gating, original 16-frame gated images resulted in larger end-diastole volume (EDV) (mean ± SD: 68.6 ± 27.11 mL vs 66.2±25.41 mL, p<0.001), smaller end-systole volume (ESV) (mean ± SD: 24.6±8.7 mL vs 26±7.3 mL, p<0.001), and higher EF (64% vs 60.2%, p<0.001). The results for the interpolated series were also different from the original images (closer to the original 16-frame series rather than 8-frame).
Conclusion: Changing the frame number from 8 to 16 in cardiac ECG-gated SPECT images caused a significant change in LV volumes and EF. Frame interpolation with sophisticated algorithms can be used to improve the temporal resolution of SPECT images.
Keywords: SPECT, Echocardiography, Interpolation, End-diastole volume (EDV), End-systole volume (ESV), Ejection fraction (EF)
Type of Study: Original Research |
Subject:
Medical Physics and Radiation Therapy
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