EVALUATION OF OPTIMAL SCAN PARAMETERS OF ROUTINE HELICAL CHEST CT : IS 10/10/10 THE OPTIMAL SCAN PARAMETER?

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Helical computed tomography (CT) has been introduced for CT examination of the thoracic region. In many cases, images are taken under the following parameter : collimation, 10-mm ; and table feed, 10-mm, which are generally used for conventional CT, and reconstructed at 10-mm intervals (10/10/10). In this study, we made experimental and clinical examinations to evaluate whether these imaging parameters were optimal. In the experimental examination the attenuation value and shape of targets on helical scan were relatively maintained until the pitch (table feed speed/collimation) reached 1.5. With imaging at 7-mm collimation, partial volume effects decreased and images were clearer, compared to imaging at 10-mm collimation. In our clinical examination, precontrast CT images were scanned at 7/10 with reconstruction of both 7 mm and 10 mm intervals (7/10/7,7/10/10) in 100 patients. Then postcontrast CT images were obtained at 10/10/10 parameters. The detectability and the shape of the lesions were compared between these three parameters. As a result, 7/10/7 was superior to 10/10/10 and 7/10/10 both far the detectability and of lesions clarity. 7/10/10 demonstrated less distorted images than 10/10/10 with almost similar detectability. In addition, the exposure dose is reduced to about 70% at 7/10 parameters compared to 10/10,10/10/10 was obviously less advantageous than 7/10/7 with regard to the detectability, clarity of the lesions, and exposure dose. In conclusion, we believe 7/10/7 is the optimal parameter for routine examination instead of 10/10/10.
名古屋市立大学の論文
2001-02-01

EVALUATION OF OPTIMAL SCAN PARAMETERS OF ROUTINE HELICAL CHEST CT : IS 10/10/10 THE OPTIMAL SCAN PARAMETER?

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