HRCT is computed tomography (CT) with high resolution. It is used in the diagnosis of various health problems. HRCT involves the use of special computed tomography scanning techniques to assess the lung parenchyma which enables it to diagnose certain Lung diseases better than conventional radiography.
HRCT is performed using a conventional CT scanner. However, imaging parameters are chosen so as to maximize spatial resolution:
Protocol for High-Resolution CT Scanning of the Chest
Intravenous contrast agents are not used for HRCT as the lung inherently has very high 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.
Use as a diagnostic test
Other miscellaneous conditions where HRCT is a useful diagnostic tool are :
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