Application of subsecond rotation scan to helical CT for lung cancer screening.
| Autor: | Mori Y; Department of Radiology, Nagoya University Graduate School of Medicine, Japan. yoshine@jg7.so-net.ne.jp, Itoh S, Ikeda M, Sawaki A, Suzuki K, Iwano S, Satake H, Arahata S, Ota T, Ishigaki T |
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| Jazyk: | angličtina |
| Zdroj: | Nagoya journal of medical science [Nagoya J Med Sci] 2006 Jun; Vol. 68 (3-4), pp. 139-45. |
| Abstrakt: | Purpose: To clarify whether the benefit of a reduced effective scan width obtained using a smaller pitch outweighs the disadvantage of increased noise in the application of a subsecond helical CT to mass screenings for lung cancer. Materials and Methods: Twenty-two helical CT scans of the lung were obtained in 11 healthy subjects using the following parameters: 1) scan 1 was performed at 120 kVp, 50 mA, 10-mm collimation, 1-second/rotation, helical pitch of 2.0; and 2) scan 2 was performed at 120 kVp, 50 mA, 10-mm collimation, 0.75-second/rotation, helical pitch of 1.5. Computer-generated nodules measuring 10 mm and 6 mm in diameter showing ground-glass opacity were superimposed on these images. The detectability of each nodule was evaluated by six blinded readers using ROC analysis. Results: Detectability of the 6-mm nodules was significantly higher in scan 2 than in scan 1. Detectability of the 10-mm nodules was not significantly different between scans 1 and 2. Conclusion: The use of a smaller pitch by employing a subsecond rotation scan in a helical CT for lung cancer screenings improves the detection of small lesions without increasing either the scanning time or radiation dose. |
| Databáze: | MEDLINE |
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