World Journal of Nuclear Medicine

ORIGINAL ARTICLE
Year
: 2019  |  Volume : 18  |  Issue : 3  |  Page : 251--257

Quantitative comparison between single-photon emission computed tomography and positron emission tomography imaging of lung ventilation with 99mTc-technegas and 68Ga-gallgas in patients with chronic obstructive pulmonary disease: A pilot study


Enrique Gustavo Cuna1, Juan Pablo Gambini2, Liliana Servente3, Eduardo Savio3, Henry William Engler3, Gabriel Adrián González1, Omar Alonso4 
1 Physics Institute, Sciences Faculty, UDELAR, Montevideo, Uruguay
2 Center for Nuclear Medicine, Clinics Hospital, Medicine Faculty, UDELAR, Montevideo, Uruguay
3 Uruguayan Center for Molecular Imaging, CUDIM, Montevideo, Uruguay
4 Center for Nuclear Medicine, Clinics Hospital, Medicine Faculty, UDELAR; Uruguayan Center for Molecular Imaging, CUDIM, Montevideo, Uruguay

Correspondence Address:
Enrique Gustavo Cuna
Dr. Américo Ricaldoni 2010, Montevideo,
Uruguay

The aim of this study was quantitative comparison between 68Ga-Gallgas positron emission tomography (PET) and 99mTc-Technegas single photon emission computed tomography (SPECT) for lung ventilation function assessment in patients with moderate-to-severe obstructive pulmonary disease and to identify image-derived texture features correlating to the physiologic parameters. Five patients with moderate-to-severe chronic obstructive pulmonary disease with PET and SPECT lung ventilation scans were selected for this study. Threshold-based segmentations were used to compare ventilated regions between both imaging techniques. Histograms of both scans were compared to reveal main differences in distributions of radiotracers. Volumes of segmentation as well as 50 textural features measured in the pulmonary region were correlated to the forced expiratory volume in 1 s (FEV1) as the relevant physiological variable. A better peripheral distribution of the radiotracer was observed in PET scans for three out of five patients. A segmentation threshold of 27% and 31% for normalized scans, for PET and SPECT respectively, was found optimal for volume correlation with FEV1. A high correlation (Pearson correlation coefficient >0.9) was found between 16 texture features measured from SPECT and 7 features measured from PET and FEV1. Quantitative measurements revealed different tracer distribution in both techniques. These results suggest that tracer distribution patterns may depend on the cause of the pulmonary obstruction. We found several texture features measured from SPECT to correlate to FEV1.


How to cite this article:
Cuna EG, Gambini JP, Servente L, Savio E, Engler HW, González GA, Alonso O. Quantitative comparison between single-photon emission computed tomography and positron emission tomography imaging of lung ventilation with 99mTc-technegas and 68Ga-gallgas in patients with chronic obstructive pulmonary disease: A pilot study.World J Nucl Med 2019;18:251-257


How to cite this URL:
Cuna EG, Gambini JP, Servente L, Savio E, Engler HW, González GA, Alonso O. Quantitative comparison between single-photon emission computed tomography and positron emission tomography imaging of lung ventilation with 99mTc-technegas and 68Ga-gallgas in patients with chronic obstructive pulmonary disease: A pilot study. World J Nucl Med [serial online] 2019 [cited 2019 Dec 15 ];18:251-257
Available from: http://www.wjnm.org/article.asp?issn=1450-1147;year=2019;volume=18;issue=3;spage=251;epage=257;aulast=Cuna;type=0