Chest
ReviewsRecent Advances in Central Airway Imaging
Section snippets
Helical CT Scanning
The clinical introduction of helical CT scanning in 1991 dramatically improved the quality of CT images of the airway and other thoracic structures.17,18 In comparison with conventional CT scanning, which uses a long scan time and acquires a series of individual axial slices with repeated breath holds, helical CT scanning has a short scan time and acquires a single, volumetric data set of the entire thorax during one breath hold (Fig 2).17 Importantly, helical CT scanning reduced respiratory
MRI
Although CT scanning generally is the preferred method of imaging the airway, there are two major instances in which MRI should be considered. First, because MRI does not involve ionizing radiation, it is the preferred modality for assessing paratracheal abnormalities in children (Fig 10).46 Indeed, this technique is ideal for assessing paratracheal “rings and slings” that compress the airway. Second, because MRI does not require the use of an iodinated contrast agent, it is the preferred
Future Directions: Where Do We Go From Here?
In the near future, multidetector CT scanners and computerized reconstruction methods will become even faster and more widely accessible.25 Additionally, viewing station advances will provide an ability to rapidly navigate between a variety of display methods, including 3-D internal and external renderings, in order to meet the needs of specific airway abnormalities and individual viewer preferences. With such advances, it is likely that 2-D reformation and 3-D reconstruction will eventually
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