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[Screening CT of the lungs: image quality compared with conventional CT]
R Kamimura1, T Takashima, T Kobayashi
1Department of Radiology, Kanazawa University.
Summary
Low-dose helical computed tomography (CT) shows promise for early lung cancer screening, offering image quality comparable to conventional CT. Further improvements are needed to enhance visualization of small nodules and subsegmental bronchi.
Area of Science:
- Radiology
- Medical Imaging
- Oncology
Background:
- Early detection of peripheral lung cancer necessitates sensitive imaging techniques.
- Helical volumetric computed tomography (CT) presents a potentially attractive radiologic method.
Purpose of the Study:
- To compare the image quality of low-dose helical CT (screening CT) with conventional sequential CT for detecting pulmonary metastases.
- To evaluate the efficacy of screening CT in visualizing mediastinal vessels, bronchi, and pulmonary nodules.
Main Methods:
- A low-dose helical CT protocol (screening CT) using a single breath-hold (20 seconds) at 40 mA with a 20 mm/sec table feed.
- Conventional sequential CT performed with contiguous 10 mm-thick sections, a 1-second scan time, and 200 mA.
- Comparison of image quality and detectability in 12 patients.
Main Results:
- Screening CT demonstrated high detectability for mediastinal vessels, bronchi, and pulmonary nodules, comparable to conventional CT.
- Image noise in screening CT made visualization of subsegmental bronchi and small nodules overlapping pulmonary vessels more challenging.
- The low-dose technique yielded comparable diagnostic information for larger structures.
Conclusions:
- Low-dose helical CT (screening CT) is an attractive new application for lung cancer screening.
- Further technical improvements are required to optimize screening CT for detecting subtle pulmonary findings.