RT Journal Article
SR Electronic
T1 Comparison of Quantitative Ventilation-Perfusion Lung Scan Results Using Different Xenon-133 Ventilation Images
JF Journal of Nuclear Medicine Technology
JO J. Nucl. Med. Technol.
FD Society of Nuclear Medicine
SP 258
OP 261
VO 23
IS 4
A1 Herzog, Sharon A.
A1 Jacobson, Arnold F.
YR 1995
UL http://tech.snmjournals.org/content/23/4/258.abstract
AB Objective: This paper evaluates the influence of the specific 133Xe ventilation images used to calculate differential function in quantitative ventilation-perfusion lung scans. Methods: Whole-lung differentials were determined on 43 133Xe ventilation/99mTc-macroaggregated albumin perfusion studies. Ventilation calculations were performed for the first-breath, up to three equilibrium and the composite of all equilibrium images, and perfusion calculations were performed for the anterior and posterior images and their geometric mean. Differences of ≥5% between comparable images were considered significant. Results: The first-breath ventilation differential differed from at least one equilibrium view in 13 patients (30%) and from the composite of all equilibrium images in seven patients (16%), while the posterior perfusion differential differed from the anterior differential in 15 patients (35%) and from the geometric mean differential in six patients (14%). By comparison, the posterior or geometric mean perfusion differential differed from either the first-breath or composite ventilation differential in 31 patients (72%). Nine patients (21 %) had ventilation/perfusion discrepancies ≥10%, with ventilation differentials more symmetric in seven patients. Conclusion: The choice of 133Xe ventilation image has only a limited effect on differential calculations. Discrepancies are more frequent between ventilation and perfusion differentials, making it important to determine both, particularly in patients with asymmetric lung disease.