Nucl Med Mol Imaging.  2017 Jun;51(2):161-168. 10.1007/s13139-016-0448-3.

Comparison of Two Different Segmentation Methods on Planar Lung Perfusion Scan with Reference to Quantitative Value on SPECT/CT

Affiliations
  • 1Department of Nuclear Medicine, Seoul National University Hospital, 101 Daehangno, Jongro-gu, Seoul 03080, South Korea. larrycheon@gmail.com
  • 2Graduate School of Convergence Science and Technology, Seoul National University, Seoul, South Korea.
  • 3Department of Thosracic Surgery, Seoul National University Hospital, Seoul, South Korea.
  • 4Department of Radiological Sciences, University of California, Irvine, CA, USA.

Abstract

PURPOSE
Until now, there was no single standardized regional segmentation method of planar lung perfusion scan.We compared planar scan based two segmentation methods, which are frequently used in the Society of Nuclear Medicine, with reference to the lung perfusion single photon emission computed tomography (SPECT)/computed tomography (CT) derived values in lung cancer patients.
METHODS
Fifty-five lung cancer patients (male:female, 37:18; age, 67.8 ± 10.7 years) were evaluated. The patients underwent planar scan and SPECT/CT after injection of technetium-99 m macroaggregated albumin (Tc-99 m-MAA). The % uptake and predicted postoperative percentage forced expiratory volume in 1 s (ppoFEV1%) derived from both posterior oblique (PO) and anterior posterior (AP) methods were compared with SPECT/CT derived parameters. Concordance analysis, paired comparison, reproducibility analysis and spearman correlation analysis were conducted.
RESULTS
The % uptake derived from PO method showed higher concordance with SPECT/CT derived % uptake in every lobe compared to AP method. Both methods showed significantly different lobar distribution of%uptake compared to SPECT/CT. For the target region, ppoFEV1% measured from PO method showed higher concordance with SPECT/CT, but lower reproducibility compared to AP method. Preliminary data revealed that every method significantly correlated with actual postoperative FEV1%, with SPECT/CT showing the best correlation.
CONCLUSIONS
The PO method derived values showed better concordance with SPECT/CT compared to the AP method. Both PO and AP methods showed significantly different lobar distribution compared to SPECT/CT. In clinical practice such difference according to different methods and lobes should be considered for more accurate postoperative lung function prediction.

Keyword

Lung cancer; Lung function; Perfusion imaging; SPECT-CT
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