Medical Journal of the Islamic Republic Of Iran
مجله پزشکی جمهوری اسلامی ایران
Med J Islam Repub Iran
Medical Sciences
http://mjiri.iums.ac.ir
2
journal2
1016-1430
2251-6840
8
10.18869/mjiri
14
8888
13
en
jalali
1398
11
1
gregorian
2020
2
1
34
1
online
1
fulltext
en
The impact of frame numbers on cardiac ECG-gated SPECT images with interpolated extra frames using echocardiography
Medical Physics and Radiation Therapy
Medical Physics and Radiation Therapy
Original Research
Original Research
<strong>Background: </strong>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.<br>
<strong>Methods:</strong> 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.<br>
<strong>Results:</strong> 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).<br>
<strong>Conclusion:</strong> 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.
SPECT, Echocardiography, Interpolation, End-diastole volume (EDV), End-systole volume (ESV), Ejection fraction (EF)
408
414
http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1009-1&slc_lang=en&sid=1
Maghsoud
Sarebani
sarebani90@gmail.com
200319475328460064026
200319475328460064026
No
Department of Medical Physics, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
Mohammad Bagher
Shiran
shiran.m@iums.ac.ir
200319475328460064027
200319475328460064027
Yes
Department of Medical Physics, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
Ahmad
Bitarafan-Rajabi
bitarafan@hotmail.com
200319475328460064028
200319475328460064028
No
Cardiovascular Intervention Research Center, & Echocardiography Research Center, Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
Fereidoon
Rastgoo
f_rastgou@yahoo.com
200319475328460064029
200319475328460064029
No
Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
Zahra
Ojaghi Haghighi
zohamahsa@yahoo.com
200319475328460064030
200319475328460064030
No
Department of Echocardiography, Rajaei Cardiovascular, Medical and Research Center, Iran University of Medical Science, Tehran, Iran
Ali
Abbasian Ardakani
A.ardekani@live.com
200319475328460064031
200319475328460064031
No
Department of Medical Physics, School of Medicine, Iran University of Medical Sciences, Tehran, Iran