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Planar images reprojected from SPECT V/Q data perform similarly to traditional planar V/Q scans in the diagnosis of pulmonary embolism

Kyrtatos, Panagiotis G.; Navalkissoor, Shaunak; Burniston, Maria; Wagner, Thomas

Nuclear Medicine Communications: May 2013 - Volume 34 - Issue 5 - p 445–450
doi: 10.1097/MNM.0b013e32835fa531
Original Articles

Objective: To compare the diagnostic interpretation of traditional ventilation/perfusion (V/Q) planar images with that of planar-like images reprojected from single-photon emission computed tomography (SPECT) data sets.

Methods: Retrospective data from patients who had undergone both planar and SPECT imaging were used to generate anonymized reprojected planar images, which were compared with traditional planar V/Q images. Two consultants interpreted both sets of images for 81 patients following a proforma. We assessed the agreement in the final diagnosis between the two imaging methods and between the two clinicians. We also compared the number, nature, and localization of defects, as well as image quality. Finally, we compared the diagnosis made using planar methods with the original diagnosis made using SPECT.

Results: There was excellent agreement in diagnosis both between the two planar methods (κ=0.93) and between the two consultants (κ=0.91). Similar numbers of defects were detected, with fewer matched defects being reported in the reprojected group by one of the clinicians. Localization of defects and image quality were similar for the two imaging methods. Six additional pulmonary embolisms were diagnosed using SPECT data.

Conclusion: We have shown that the performance of reprojected planars from SPECT V/Q was similar to that of traditional planars. These results have potential important implications for patient workflow in busy nuclear medicine departments, as well as for patient comfort.

Department of Nuclear Medicine, Royal Free London NHS Foundation Trust, London, UK

Correspondence to Thomas Wagner, MD, Department of Nuclear Medicine, Royal Free London NHS Foundation Trust, Pond Street, London NW3 2QG, UK Tel: +44 207 830 2470; fax: +44 207 830 2469; e-mail:

Received December 7, 2012

Accepted January 19, 2013

© 2013 Wolters Kluwer Health | Lippincott Williams & Wilkins