SummaryLung perfusion studies were carried out using99mTc‐MAFH (macroaggregated ferrous hydroxide) on 123 occasions in 100 subjects. Multiple‐view rectilinear scans and scintiphotos were obtained. Good correlation was found on comparison of the two techniques. However, scintiphotography has the advantage of speed, reduced incidence of patient movement artefacts, and less variation in quality. Differences in focusing characteristics between the two systems produce slight differences in appearance and it is important to recognize these.The lateral projection was of great value in the delineation of perfusion defects, greatly increasing the efficiency of either method of examination. Changes in scan defects were rarely parallel in all views and the lateral projection was invaluable in assessing defect resolut