Low-dose<unk><unk>  (1.25 mm) chest CT<unk>  is performed using a conventional CT scanner. However, imaging parameters are chosen so as to maximize spatial<unk> : a narrow slice width is used (usually 1–2 mm), a<unk>  spatial<unk>  image reconstruction algorithm is used, field of view is minimized, so as to minimize the size of each pixel, and other scan factors (e.g. focal spot) may be optimized for<unk>  at the expense of scan speed. Depending on the suspected diagnosis, the scan may be performed in both inspiration and expiration. In inspiration images are taken in the prone position. In expiratory<unk>  the scan is taken in the supine position (face up). As<unk> 's aim is to assess a generalized lung disease, the test is conventionally performed by taking thin sections which are 10–40 mm apart from each other. The result is a few images that should be representative of the lungs in general, but that cover only approximately one tenth of the lungs. Intravenous contrast agents are not used for<unk>  as the lung inherently has very<unk>  contrast (soft tissue against air), and the technique itself is unsuitable for assessment of the soft tissues and blood vessels, which are the major targets of contrast agents.
High-resolution computed tomography
Dual Source CT
Photon-counting computed tomography
Cone beam computed tomography
Computed radiography
Digital radiography
Digital X-ray radiogrammetry
Electron beam computed tomography