Fig. 2

Three examples of posterior static acquisitions from a normal, an abnormal, and a regional abnormal PRMC test showing initial aerosol deposition together with remaining aerosol deposition after 2 and 24 h. Two ⁵⁷Co markers over the cervical and lumbar spine are used to help position the patient. Top row: normal PRMC test. LR₂ was 38 % (predicted = 70 %, upper normal limit = 86 %, Z-score = -3.3). Centre row: abnormal PRMC test. The radioaerosol is seen to be initially centrally deposited, and after 2 h, very little is cleared. The same foci are still very distinct after 24 h. LR₂ was 100 % (predicted = 72 %, upper normal limit = 88 %, Z-score = 2.9). Bottom row: regional abnormal PRMC test. LR₂ was 85 % (predicted = 77 %, Upper normal limit = 93 %, Z-score = 0.8), but a distinct focus is seen in the left lung after both 2 and 24 h