Dynamic Imaging of Pulmonary Ventilation in Children Using Digital Subtraction Radiography

Dynamic Imaging of Pulmonary Ventilation

“…The entrance dose measurements using the water phantom showed slightly higher doses when compared with the pulmonary examinations performed with digital subtraction angiographic equipment (9). However, patient doses are acceptable, because of the increased yield of information.…”

“…Normal ventilation is characterized by symmetrical and synchronous gray shade variations in the lungs and symmetrical movement of the diaphragmatic leaflets (1, 2, 8,9). A series of REL-images together with corresponding histograms and curves have not, to our knowledge, been previously demonstrated.…”

“…However, the temporal resolution when, for example, 16 images from 2 respiratory cycles were collected is much lower than that obtained with fluorodensitometry using analog techniques (3)(4)(5)(6)(7)9). Similar information could also be gained from the original digital images when ROI-analysis was used.…”

“…The device described here can be used for more flexible imaging and measurements of pulmonary ventilation than digital subtraction angiographic systems (1, 2,8,9). The flexible timing of the image sequence and the option of connecting the device to a standard fluoroscopy stand favors the usage of a special digital fluoroscopy system for Method Present method 0.6 mGy/3.5 s DSA-device examination (9) 0.3 mGy Fluoroscopy of the lung 2 mGy/l min A.p.…”

“…Dynamic imaging of ventilation has demonstrated abnormalities even when abnormal findings were not seen with other modalities (9). Dynamic imaging of ventilation has demonstrated abnormalities even when abnormal findings were not seen with other modalities (9).…”