PMID: 11322073Apr 27, 2001Paper

Optimizing dosage in thoracic computerized tomography

Der Radiologe
M Prokop

Abstract

Radiation exposure in computed tomography (CT) by far exceeds radiation dose in chest radiography. Dose requirements in CT of the chest, however, are much smaller than for the abdomen because of low x-ray absorption in the lungs. This article describes scanner parameters that influence patient exposure and image quality. Suitable compromises will be explained that allow for dose reduction in chest CT without jeopardising image quality. Dose reduction in chest CT should be performed depending on the clinical indication and requires active reduction of mAs settings. For helical CT, a pitch of 1.5 to 2 should be employed. Dedicated low-dose techniques for screening of bronchogenic carcinoma are described. Dose reduction decreases image quality but the detrimental effects can be reduced by applying proper parameters for scanning and image reconstruction. Thus, images of the mediastinum should be reconstructed with a smoothing filter, while a higher resolution filter should be used for the lungs. In multislice CT, reconstruction of thicker axial or multiplanar sections retains spatial resolution but keeps image noise and thus dose requirements low. The effective, weighted CT dose index (CTDIw,eff) can serve as a rough estimate of th...Continue Reading

Citations

Apr 15, 2004·Journal of Korean Medical Science·Mannudeep K KalraJo-Anne O Shephard
Nov 9, 2007·Acta chirurgica Iugoslavica·O SveljoM Prvulović
Apr 14, 2010·Thyroid : Official Journal of the American Thyroid Association·Guo-Pei YuStimson P Schantz
Jan 9, 2004·Journal of Thoracic Imaging·Michael M MaherJoanne Shepard

❮ Previous
Next ❯

Related Concepts

Related Feeds

Carcinoma, Bronchogenic

Bronchogenic Carcinoma is a malignant lung cancer arising in the epithelium of the bronchus or bronchiole. Discover the latest research on Bronchogenic Carcinoma here.